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Generation and clearance of myelin debris after spinal cord injury 认领 引用 被引量：1
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作者 Chaoyuan Li Wenqi Luo +6 位作者 Irshad Hussain Renrui Niu Xiaodong He Chunyu Xiang Fengshuo Guo Wanguo Liu Rui Gu 《Neural Regeneration Research》 SCIE CAS CSCD 2026年第4期1512-1527,共16页
Traumatic spinal cord injury often leads to the disintegration of nerve cells and axons,resulting in a substantial accumulation of myelin debris that can persist for years.The abnormal buildup of myelin debris at site... Traumatic spinal cord injury often leads to the disintegration of nerve cells and axons,resulting in a substantial accumulation of myelin debris that can persist for years.The abnormal buildup of myelin debris at sites of injury greatly impedes nerve regeneration,making the clearance of debris within these microenvironments crucial for effective post-spinal cord injury repair.In this review,we comprehensively outline the mechanisms that promote the clearance of myelin debris and myelin metabolism and summarize their roles in spinal cord injury.First,we describe the composition and characteristics of myelin debris and explain its effects on the injury site.Next,we introduce the phagocytic cells involved in myelin debris clearance,including professional phagocytes(macrophages and microglia)and non-professional phagocytes(astrocytes and microvascular endothelial cells),as well as other cells that are also proposed to participate in phagocytosis.Finally,we focus on the pathways and associated targets that enhance myelin debris clearance by phagocytes and promote lipid metabolism following spinal cord injury.Our analysis indicates that myelin debris phagocytosis is not limited to monocyte-derived macrophages,but also involves microglia,astrocytes,and microvascular endothelial cells.By modulating the expression of genes related to phagocytosis and lipid metabolism,it is possible to modulate lipid metabolism disorders and influence inflammatory phenotypes,ultimately affecting the recovery of motor function following spinal cord injury.Additionally,therapies such as targeted mitochondrial transplantation in phagocytic cells,exosome therapy,and repeated trans-spinal magnetic stimulation can effectively enhance the removal of myelin debris,presenting promising potential for future applications. 展开更多
关键词 foam cells lipid droplets lipid metabolism macrophages microglia myelin debris myelin proteins myelin sheath nerve regeneration phagocytosis spinal cord injury
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Collision risk assessment for constellation satellites based on a space debris environment topological network model 认领 引用 被引量：1
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作者 Yurun YUAN Jingrui ZHANG +2 位作者 Keying YANG Lincheng LI Hao WU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第2期472-484,共13页
In recent years,the rapid development of mega-constellations has significantly exacerbated the deterioration of the space debris environment,posing substantial and escalating threats to the safety of spacecraft.This s... In recent years,the rapid development of mega-constellations has significantly exacerbated the deterioration of the space debris environment,posing substantial and escalating threats to the safety of spacecraft.This study aims to explore the complex evolution of the space debris environment and assess the collision risks associated with spacecraft.First,a space debris environment topological network model is proposed,which incorporates interdisciplinary methods from topological networks,fluid mechanics,and spacecraft dynamics.This model enables a structured representation of the relationships among space objects and provides rapid predictions of the space debris environment.Then,a collision probability algorithm based on the topological network model is introduced.This algorithm inherits the efficiency advantages of the topological network model and has been validated for reliability through comparison with the classical ESA’s DRAMA software.Finally,based on the above models,the collision risks of constellation satellites in Low Earth Orbit(LEO)are analyzed,including both operational and deorbit processes.The study reveals that constellation satellites face a much higher risk of internal collisions with satellites from the same constellation during operations than that with other space objects.Additionally,during the satellite deorbit process,the collision risk peaks when satellites traverse the operational region of Starlink satellites. 展开更多
关键词 Collision probability Computing resource Constellation Space debris Topological network model
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Integrating information value method and extreme gradient boosting for debris flow susceptibility assessment on the piedmont clinoplain considering watershed erosion 认领 引用
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作者 CAO Chen BAI Ji +7 位作者 SONG Tianhao LI Haibao XU Peihua PENG Shuaiying ZHENG Lianjing ZHU Kuanxing WU Chenyang JING Yaxuan 《Journal of Mountain Science》 SCIE CSCD 2026年第4期1614-1634,共21页
Assessing debris flow susceptibility is crucial for predicting their occurrence and associated hazards.However,traditional methods rely on relatively static environmental conditions,which exposes the lag in the tempor... Assessing debris flow susceptibility is crucial for predicting their occurrence and associated hazards.However,traditional methods rely on relatively static environmental conditions,which exposes the lag in the temporal dynamic changes of debris flow susceptibility assessment.This study focuses on the transition from low to mid mountain terrain located at the southern piedmont of the Yinshan Mountains to a plain within the piedmont clinoplain of the Inner Mongolia Plateau.By integrating the Information Value Method(IVM)and Extreme Gradient Boosting(XGBoost)and utilizing high spatiotemporal surface change data derived from interferometric synthetic aperture radar(InSAR),a new evaluation factor,namely the“basin erosion degree,”is introduced to enhance debris flow susceptibility assessment.The contribution analysis of evaluation results and evaluation factors based on two models shows that IVM and XGBoost identified 90.48%and 95.23%of debris flow gullies in the study area,respectively,and both performed well.XGBoost also performed well in identifying non-debris flow gullies,demonstrating its extremely high accuracy and practicality in assessing debris flow activity in small data scenarios,while IVM misjudged a large number of non-debris flow gullies due to not considering the weight of evaluation factors.Moreover,the newly introduced watershed erosion evaluation factor ranks fourth in the contribution to debris flow,which is of great significance for activity evaluation.The dynamic characteristics of typical debris flow gullies in the study area were simulated using Flo-2D numerical simulation software.The results indicate that mudslides in the area can invade roads,residential buildings,and other facilities,posing a threat to production and daily life.This study accurately assessed the susceptibility of debris flows in the study area by introducing dynamic evaluation factors,making progress in debris flow susceptibility modeling,and promoting the construction of active disaster management systems. 展开更多
关键词 Piedmont Clinoplain Debris Flow Susceptibility Basin Erosion Degree XGBoost InSAR
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Morphological and dynamic characteristics of abrasion on drainage structures in response to debris flow 认领 引用
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作者 YANG Dongxu LU Shuai +6 位作者 YOU Yong SUN Hao ZHAO Wanyu ZHOU Ziyi LI Yuanling ZHANG Jiajia WANG Dongpo 《Journal of Mountain Science》 SCIE CSCD 2026年第4期1635-1652,共18页
Abrasion,a complex physical phenomenon prevalent in natural and engineered structures,frequently causes significant functional failures in drainage channels under the debris flow impact force.This underscores critical... Abrasion,a complex physical phenomenon prevalent in natural and engineered structures,frequently causes significant functional failures in drainage channels under the debris flow impact force.This underscores critical knowledge gaps regarding abrasion effects on debris flow-scoured drainage structures.Through multi-stage field investigations and data analysis across four representative areas,this study proposes a classification system for abrasion phenomena and analyzes morphological characteristics across different drainage structures and debris flow types(rainy vs.glacial).Further,the study methodically uncovers the long-term spatiotemporal distribution,development,and progression of abrasion in drainage channels and check dams.Dynamic abrasion characteristics were evaluated using three key parameters per debris flow:average gully vertical drop,watershed relative cutting degree,and soil sample data.The findings indicate that rainy debris flows exhibit higher average vertical drops(max:0.933)compared to glacial debris flows(max:0.621).Glacial debris flows show greater relative watershed cutting degrees(range:0.15–0.3)than rainy types(range:0.075–0.2).Multiple influencing factors were compared to identify critical controls on abrasion intensity.Debris flow velocity distribution and particle gradation within channels emerged as the primary determinants of abrasion distribution.Notably,a higher proportion of viscous particles(grain size D20%).These findings quantitatively inform the optimization of debris flow mitigation,providing a critical foundation for improving structural design,wear repair techniques,and channel configuration. 展开更多
关键词 Debris flow Drainage structure Dynamics characteristics Abrasion morphology Abrasive severity
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Surface ablation of a debris-covered and crevassed temperate glacier on Mt.Yulong,southeastern Tibetan Plateau 认领 引用
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作者 YAN Xingguo WANG Shijin +3 位作者 PU Tao SUN Zhenqi REN Zijian QIN Rizheng 《Journal of Geographical Sciences》 SCIE CSCD 2026年第6期1463-1482,共20页
This study investigated the spatial and temporal patterns of ablation,debris-cover characteristics,and crevasse distribution on Baishui River Glacier No.1 based on using multi-year in situ observations(2019-2022).The ... This study investigated the spatial and temporal patterns of ablation,debris-cover characteristics,and crevasse distribution on Baishui River Glacier No.1 based on using multi-year in situ observations(2019-2022).The results reveal a strong elevation-dependent ablation gradient,with annual ablation rates decreasing from 3.8-5.4 m w.e.at 4550-4600 m asl to 1.1-2.1 m w.e.above 4750 m asl,following a gradient of-1.53 m w.e.(100 m)-1.Ablation along the central flowline was 21%-42%higher than along lateral margins.Debris covers approximately 20%of the glacier surface,with 92%concentrated below 4800 m asl.Coverage transitions from near continuous(>80%)below 4600 m asl to a patchy distribution at higher elevations.The debris-ablation relationship is nonlinear:2-5 cm of debris increases melt to 6.7-7.3 cm/day,while thicknesses exceeding 15 cm reduce ablation by 35%-62%.The relationship between melting and debris thickness follows a nonlinear curve(theÖstrem curve),in which thin debris enhances melting relative to bare ice,while thick debris insulates.Crevasses disrupt debris continuity and create localised melt hotspots,complicating traditional mass balance models.By enhancing radiation absorption,hydrothermal coupling,and debris redistribution,they amplify ablation,which is often overlooked.These findings are key to understanding how debris-covered crevasse-rich temperate glaciers respond to climate change. 展开更多
关键词 temperate glacier in-situ measurements ablation debris cover crevasses
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Spatial differentiation and risk zonation of debris flow hazards in Tajikistan 认领 引用
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作者 JIA Wenjun CHEN Ningsheng +5 位作者 XUE Yang WANG Zhihan WEN Tao GUO Ru Safaralizoda NOSIR Aminjon GULAKHMADOV 《Regional Sustainability》 CAS CSCD 2026年第1期122-143,共22页
Debris flow events are frequent in Tajikistan,yet comprehensive investigations at the regional scale are limited.This study integrates remote sensing,Geographic Information System,and machine learning techniques to ev... Debris flow events are frequent in Tajikistan,yet comprehensive investigations at the regional scale are limited.This study integrates remote sensing,Geographic Information System,and machine learning techniques to evaluate debris flow susceptibility and associated hazards across Tajikistan.A dataset comprising 405 documented debris flow points and 14 influencing factors,encompassing geological,climatic-hydrological,and anthropogenic variables,was established.Three machine learning algorithms—Random Forest,Support Vector Machine(SVM),and Multi-layer Perceptron—were applied to generate susceptibility maps and delineate debris flow risk zones.The results indicate that the areas of higher and high susceptibility accounted for 20.43%and 4.41%of the national area,respectively,and were predominantly concentrated along the Zeravshan and Vakhsh river basins.Among the evaluated models,SVM model demonstrated the highest predictive performance.Beyond conventional topographic and environmental controls,drought conditions were identified as a critical factor influencing debris flow occurrence within the arid and semi-arid mountainous regions of Tajikistan.These findings provide a scientific basis for regional debris flow risk management and disaster mitigation planning,and offer practical guidance for selecting conditioning factors in machine-learning-based susceptibility assessments in other dry mountainous environments. 展开更多
关键词 Debris flow Susceptibility assessment Risk zonation Machine learning Drought Central Asia
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A two-point three-phase resolved coupling framework for modeling boulder-laden debris flows 认领 引用
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作者 Yangfan Ma Mitsuteru Asai +3 位作者 Bin Su Zheng Han Changze Li Guangqi Chen 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期932-953,共22页
Stony debris flows,characterized by coarse boulders embedded in a sediment-laden matrix,greatly amplify destructive potential by altering flow dynamics and impact forces.Conventional single-phase particle-fluidmixture... Stony debris flows,characterized by coarse boulders embedded in a sediment-laden matrix,greatly amplify destructive potential by altering flow dynamics and impact forces.Conventional single-phase particle-fluidmixture models often struggle to capture the complexities introduced by coarse boulders and multi-phase interactions,while strong-coupling methods can be computationally prohibitive for practical hazard assessments.In this study,we propose a semi-hybrid,fully resolved coupling numerical framework for modeling boulder-laden debris flows.This framework conceptualizes debris flows as a composite system comprising a continuous viscous fluidphase(including finesediments)and a discrete phase of arbitrarily shaped coarse particles.The continuous phase is treated as a generalized nonlinear Coulomb-viscoplastic fluidusing the smoothed particle hydrodynamics(SPH)method,while coarse particles are modeled via the distributed contact discrete element method(DCDEM).These two phases are coupled through an efficienttwo-way resolved scheme,ensuring accurate simulation of flow-boulder interactions within a unifiedtimeframe.We validate the proposed method against two physical experiments:(1)gravity-driven concrete flows and(2)debris flowinteracting with slit-type barriers.Results confirmthe method's robustness in accurately capturing fluid-solid-structureinteractions and deposition processes.Its capabilities are further showcased through the simulation of a stony debris-flowevent inWenchuan County,China,highlighting its promise for real-world engineering applications and validating the effectiveness of the existing cascade dam system in mitigating debrisflowimpact and energy dissipation. 展开更多
关键词 Debris flow Large boulders Smooth particle hydrodynamics(SPH) Discrete element method(DEM) Multi-phase Resolved coupling
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Micro-Textural Fingerprints of Uranium Minerals within Carbonaceous Debris: A Case Study from the Ordos Basin 认领 引用
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作者 Fan Zhang Yangquan Jiao +1 位作者 Liqun Wu Hui Rong 《Journal of Earth Science》 SCIE CAS CSCD 2026年第1期81-91,共11页
Carbonaceous debris(CD) is widely disseminated within sandstones in the Shuanglong uranium deposit,southern Ordos Basin,and is the dominant enrichment agent for uranium precipitation.The occurrence and chemical compos... Carbonaceous debris(CD) is widely disseminated within sandstones in the Shuanglong uranium deposit,southern Ordos Basin,and is the dominant enrichment agent for uranium precipitation.The occurrence and chemical composition of uranium minerals within CD were investigated by using scanning electron microscope and electron microprobe analyses.The results show that uranium minerals mostly occur in cell pores in the forms of fructus aurantia and concentric band structure.Pitchblende and coffinite are the main uranium minerals,and the former is dominant.According to the crystal morphology and composition of trace elements of uranium minerals,uranium precipitation on the pores is grouped into two periods,orderly Ⅰ,Ⅱ.Moreover,the Ⅰ period is further divided into two sub-period,orderly Ⅰ1,Ⅰ2.Moreover,askew sphere uranium minerals could indicate fluid migration.Under certain geological environment condition,uranium is unevenly adsorbed on the surface of the pore by the Van der Waals(i.e.,Ⅰ1 period),and then is precipitated towards to the center of the pore until the whole pore is filled up with uranium minerals by complicated process such as microorganism activities(i.e.,Ⅰ2,Ⅱ period).It will provide some guidance for studying the metallogenic environment and genesis of sandstone-type uranium deposit. 展开更多
关键词 uranium occurrences cell pores carbonaceous debris sandstone-type uranium deposit Shuanglong uranium deposit
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Dynamic characteristics of residual debris flows and response mechanisms of check dam in Baima Gully along the Jiumian Expressway 认领 引用
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作者 QIU Enxi LIU Wenhao +4 位作者 YUE Yunbao LI Chuanbao XU Wengang LI Yuwei LIU Jun 《Journal of Mountain Science》 SCIE CSCD 2026年第7期3259-3274,共16页
Post-event debris-flow gullies frequently retain substantial loose material,yet the residual risk they pose is difficult to evaluate due to a scale mismatch:catchment-scale runout models lack the resolution to assess ... Post-event debris-flow gullies frequently retain substantial loose material,yet the residual risk they pose is difficult to evaluate due to a scale mismatch:catchment-scale runout models lack the resolution to assess local structural impacts,while structural-scale models typically rely on idealized inflow conditions.To address this,we develop a crossscale analytical framework applied to Baima Gully along the Jiumian Expressway,which retained abundant loose debris following the 16 August 2020 event.Residual source materials were quantified through field investigations,UAV surveys,highresolution topographic data,and remote-sensing interpretation.The 2020 event was back-analyzed using Mass Flow software to calibrate dynamic parameters,and the validated model was then employed to predict potential residual debris-flow behavior.Resulting hydrographs at the dam site were subsequently used as inputs for fluid-structure interaction simulations in ANSYS CFX and complementary physical flume tests.Mass Flow predictions indicate that a future residual flow could attain a peak velocity of 4.11 m·s-1 near the gully outlet and form a fan-shaped deposit with a maximum flow depth of approximately 5.91 m.Implementation of a proposed solid gravity check dam reduces outlet impact velocity by 49%,decreases inundation area by 41%,and attenuates peak discharge through the spillway by 63.5%.Simulations and flume experiments consistently show that the dam promotes an upstream wedge-shaped deposit,redirects subsequent surge waves,and shifts the peak pressure zone from the dam toe to its mid-height region.Flume measurements reveal a reduction in peak impact pressure from 42.85k Pa to 15.96 k Pa,reflecting a buffering mechanism involving flow redirection,frictional dissipation,and soil arching.Structural verification yields a safety factor of 1.62 for the C25 concrete dam.The proposed framework effectively integrates residual risk prediction,mitigation performance evaluation,and structural response analysis,offering a robust basis for check-dam design in post-event debris-flow gullies along mountainous transport corridors. 展开更多
关键词 Baima Gully Residual debris flow Numerical simulation Check dam Impact mechanism Fluid-structure interaction
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Pore pressure evolution and entrainment mechanism of convex unsaturated colluvial beds with divergent compositions under debris flow overriding 认领 引用
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作者 Pu Li Kaiheng Hu Jiading Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期278-298,共21页
A debris flow descending through an erodible convex colluvial bed,originating from a landslide dam and its upstream deposits,can entrain massive amounts of sediment,dramatically increasing the debris flow volume.Most ... A debris flow descending through an erodible convex colluvial bed,originating from a landslide dam and its upstream deposits,can entrain massive amounts of sediment,dramatically increasing the debris flow volume.Most existing erosion models assume that bed sediments are fully saturated,although this condition is rarely observed in nature.Therefore,a thorough understanding of debris flow overtopping erosion on a convex unsaturated bed is crucial for quantifying disaster risk.In this study,we experimentally investigated the effects of sediment composition,specifically coarse-grain size distribution and fine particle content,on the pore pressure evolution and entrainment of debris flows overriding a convex unsaturated colluvial bed.The average entrainment rate at convex sites for continuously graded bed sediment was higher than its discontinuous counterpart.The measured pore pressures within the unsaturated bed sediments were primarily generated by the passing debris flows.Furthermore,it was found that these pressures decreased as the fine particle content increased and the coarse-grain size of the erodible substrates decreased.When the coarse-grain size of the debris flow was smaller than that of the bed sediment,only a portion of the eroded material was entrained by the moving debris flow.In contrast,when the coarse-grain size of the debris flow was equal to or greater than that of the bed sediment,nearly all of the eroded material was entrained.The findings of this study could contribute to the assessment of hazard amplification and inform the design of mitigation and prevention strategies. 展开更多
关键词 Debris flow Convex colluvial bed Sediment composition Unsaturated bed Pore pressure Entrainment
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Space and velocity field models of debris cloud in hypervelocity impact of disk projectile on thin plate 认领 引用
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作者 Chunbo Zhang Xiaowei Chen Yonggang Lu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第3期611-630,共20页
In order to reconstruct the evolution process and characterize the fragments’motion of the debris cloud,the space and velocity field models of debris cloud generated by a hypervelocity disk projectile impacting a thi... In order to reconstruct the evolution process and characterize the fragments’motion of the debris cloud,the space and velocity field models of debris cloud generated by a hypervelocity disk projectile impacting a thin plate are developed by using the shock wave theory in this study.To obtain the characteristic velocity of the debris cloud accurately,shock wave loading and isentropic unloading are considered.In particular,the effect of the isentropic unloading of rarefaction wave on particle velocity is considered based on the Bless model.The difference in particle velocity between shock wave loading and rarefaction wave isentropic unloading is calculated for oxygen-free high-conductivity copper(used as projectile material)and Al 6061-T6(used as bumper material)considering different shock pressure values.To solve the characteristic velocity of the debris cloud,a modified isentropic unloading model is developed.Then,based on the self-similarity assumption and modified isentropic unloading model,the structural contour function of the debris cloud at a stable expansion stage is introduced to establish the space and velocity field models.Furthermore,numerical simulation using smooth particle hydrodynamics is conducted to verify and analyze the model results.The spray angle of the debris cloud and contour map of the velocity of particles in the cloud are obtained.Finally,the evolution process of the debris cloud is reconstructed,and the motion characteristics of the fragments in the cloud are quantitatively described. 展开更多
关键词 Hypervelocity impact Debris cloud Velocity field model Isentropic unloading
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Mitigation of boulder-laden debris flow impacts on frame structures using an EVA cushion layer:A numerical study 认领 引用
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作者 LI Bailong WANG Huayan +2 位作者 LI Yanying LIU Xinyu LI Xiangling 《Journal of Mountain Science》 SCIE CSCD 2026年第5期2041-2055,共15页
This study investigates the impact effect of boulder-laden debris flows on frame structures,aiming to propose an innovative protection strategy—installing an ethylene-vinyl acetate(EVA)cushion layer on the impacted s... This study investigates the impact effect of boulder-laden debris flows on frame structures,aiming to propose an innovative protection strategy—installing an ethylene-vinyl acetate(EVA)cushion layer on the impacted surface—and verifying its disaster mitigation mechanism through numerical simulations.A coupled numerical model of 1.0-m boulders and the frame structure were developed to compare the dynamic responses of the structure with and without the cushion layer at impact velocities of 8 m/s,10 m/s,and 12 m/s.The results show that the EVA cushion layer reduces the peak impact force on the structure by 38%-52%,and its energy dissipation performance is more effective at higher flow velocities.Under a 12 m/s impact,the unprotected structure suffers weld fracture and beam-column buckling,whereas the system with the EVA cushion layer only undergoes local plastic deformation,with the critical displacement reduced by up to 68%.Mechanistic analysis confirms that the buffer layer suppresses stress wave propagation by extending impact duration and enhancing interfacial damping,thereby effectively converting boulder kinetic energy into elastic deformation energy.This study proposes a novel energy‑absorbing protection solution for frame structures in debris flow‑prone areas,offering significant practical value for enhancing the disaster resilience of mountainous engineering projects.Moreover,the numerical framework and quantitative findings provide a basis for optimizing cushion thickness and material properties in future engineering applications. 展开更多
关键词 Debris flows EVA buffer layer Numerical simulation Dynamic response Extended impact Protective structure
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Debris flow overflowing rigid barrier:Theoretical models and experimental verification 认领 引用
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作者 Gaobo Wu Dongri Song +3 位作者 Junfeng Li Yongsheng Wang Lingping Wang Chao Shi 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4367-4381,共15页
Rigid barriers,e.g.reinforced concrete check dams,are critical for debris-flow hazard mitigation,yet the mechanisms governing overflow dynamics remain poorly understood.This study develops overflow models for dry gran... Rigid barriers,e.g.reinforced concrete check dams,are critical for debris-flow hazard mitigation,yet the mechanisms governing overflow dynamics remain poorly understood.This study develops overflow models for dry granular and granular–fluid mixture flows,expressed through the incoming-flow Froude number(Fr1).The models have been verified through flume experiments with water,granular–fluid mixture flows(solid concentrations of 50%,55%,and 60%with viscosities of 0.01 Pa·s and 0.1 Pa·s),and dry granular flows.Results reveal contrasting load behaviors:dry granular flows exhibit static load-dominated regimes with minimal Fr1dependence,which results in lower actual loads than theoretical predictions.Conversely,water and granular–fluid mixture flows display dynamic load dominance,where loads increase with Fr1and measured values show good agreement with theoretical predictions.Flow transitions from hydraulic-jump to jet-up overflow at elevated Fr1,as delineated by a phase diagram.Notably,granular–fluid mixture flows induce continuous mixing with deposited materials behind the barrier,altering load distributions compared to hydrostatic profiles and generating circulation zones that either align or oppose the direction of overflow.This study advances overflow characterization and improves barrier design optimization for enhanced hazard mitigation. 展开更多
关键词 Debris flow Rigid barrier Overflow Load model Flume experiments
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Initiation mechanism of diluted debris flows in hilly areas:A case study of the Laomaoshan region 认领 引用
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作者 WANG Yuzheng NIE Lei +2 位作者 XING Liting XU Junxiang ZHAO Degang 《Journal of Mountain Science》 SCIE CSCD 2026年第6期2490-2507,共18页
Dilute debris flows in hilly regions pose persistent threats to human life and property,as evidenced by catastrophic events in the Laomaoshan area of Dalian City,China,yet their underlying initiation mechanisms remain... Dilute debris flows in hilly regions pose persistent threats to human life and property,as evidenced by catastrophic events in the Laomaoshan area of Dalian City,China,yet their underlying initiation mechanisms remain insufficiently understood.This study systematically investigates the mechanisms through an integrated approach combining physical model experiments,PFC3D numerical simulations,and theoretical mechanical analysis.Results indicate that the initiation is a progressive,gradation-controlled process driven by mesoscopic structural degradation.We propose a novel four-stage hydro-mechanical framework to elucidate this process:(1)Rainfall Infiltration,characterized by rapid matric suction dissipation and the initial weakening of strong contact force chains;(2)Initial Slip,driven by porosity-induced dilation and enhanced localized hydraulic forces at the slope toe;(3)Fissure Development,where fluid-solid velocity disparities exert substantial hydrodynamic drag on the soil skeleton,inducing retrogressive sliding;(4)Overall Mobilization,culminating in the complete collapse of the internal force network and rapid channelized fluidization.Furthermore,mesostructured soil dictates vulnerability,with discontinuously graded soils exhibiting higher susceptibility to sudden,liquefaction-like failure upon saturation.By linking mesoscopic internal yielding with macroscopic hydrodynamic entrainment,this study establishes a physically grounded framework.This coupled weakening–erosion mechanism distinguishes dilute debris flows from traditional viscous debris flows,offering a robust theoretical basis for improved prediction and early warning in analogous geomorphic environments. 展开更多
关键词 Hilly area Diluted debris flow Initiation mechanism Physical model Numerical simulation
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Formation of a typical landslide-debris flow disaster chain induced by rainstorm 认领 引用
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作者 An Zhao Xingang Wang +4 位作者 Daozheng Wang Sheng Hu Kai Liu Baoqin Lian Yuanpeng Cao 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第7期5430-5447,共18页
Due to global warming,the Qinba Mountain Area in China has experienced frequent extreme heavy rainfall events,transforming isolated geological hazards into multi-hazard chains characterized by cascading and compound d... Due to global warming,the Qinba Mountain Area in China has experienced frequent extreme heavy rainfall events,transforming isolated geological hazards into multi-hazard chains characterized by cascading and compound disasters.These occurrences often lead to severe casualties and socioeconomic losses.To investigate the formation mechanisms of typical landslide-debris flow disaster chains in this region,this study selected the Gaojiawan disaster chain—a representative case within the study area-for systematic analysis.Using integrated methodologies,including unmanned aerial vehicle(UAV)mapping,geographic information system(GIS)spatial analysis,and a numerical simulation method based on PFC3D,the entire disaster chain process was reconstructed and investigated.The results show that collision interactions between cascading hazards were found to amplify the affected area and debris flow interactions fundamentally altered deposition mechanisms,transforming localized slope accumulation into integrated mass transport processes.This paper analyzes the transformation of the landslide debris flowdisaster chain from the perspective of energy.Additionally,based on the analysis of fieldinvestigation and numerical simulation results,the formation mechanism of the Gaojiawan landslide-debris flowdisaster chain is summarized into fivestages:landslide formation stage,landslide activation stage,slope deposit mixing stage,debris flow formation stage,and low-speed deposition stage.This research elucidates the evolutionary dynamics and underlying mechanisms of landslidedominated geohazard chains in mountainous regions.The proposed integrated monitoring-modeling framework provides methodological references for theoretical research and risk mitigation of similar disaster chains worldwide. 展开更多
关键词 Landslide Debris flow Particle flowcode(PFC) Disaster chain Energy analysis Qinba mountain area
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Risk assessment of gully-type debris flow hazards based on global feature extraction using ViT 认领 引用
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作者 ZHENG Zhijie WANG Baoyun WANG Ting 《Journal of Geographical Sciences》 SCIE CSCD 2026年第6期1421-1440,共20页
When debris flows occur in medium to large gullies,they can cause significant damage.Accurately assessing their disaster risk is key to disaster prevention and reduction.Due to the difficulty that Convolutional Neural... When debris flows occur in medium to large gullies,they can cause significant damage.Accurately assessing their disaster risk is key to disaster prevention and reduction.Due to the difficulty that Convolutional Neural Networks(CNNs)face in capturing long-range dependencies,which hampers the extraction of global features for medium to large gully-type debris flow,this paper proposes a Convolutional Transformer Net(CTNet)that combines CNNs and Vision Transformer(ViT).First,positional encoding is added at the start to enhance the model's spatial awareness,and the network is widened along with the use of grouped convolutions to improve feature extraction capabilities.Next,the partitioned image is linearly projected into a sequence and fed into the ViT Block,where the multi-head self-attention mechanism captures dependencies across different subspaces.Finally,CTNet classifies the gullies into high-risk and low-risk categories based on the risk score vector.In experiments on the Nujiang Gully dataset,CTNet significantly improved the recognition performance for medium to large gullies,achieving an accuracy of 88.97%and a precision of 90.85%,which notably outperforms other comparison models.Therefore,CTNet effectively overcomes the limitations of CNNs in global modeling and provides a new paradigm for high-precision disaster-risk gully identification. 展开更多
关键词 gully-type debris flow feature extraction CNNs ViT long-range dependencies
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State Field Observation and Research Station of Debris Flow in Dongchuan,Yunnan,China 认领 引用
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《Journal of Mountain Science》 SCIE CSCD 2026年第3期F0003-F0003,共1页
State Field Observation and Research Station of Debris Flow in Dongchuan,Yunnan is also named Dongchuan Debris Flow Observation and Research Station,Chinese Academy of Sciences.The study area,Jiangjia Ravine,is about ... State Field Observation and Research Station of Debris Flow in Dongchuan,Yunnan is also named Dongchuan Debris Flow Observation and Research Station,Chinese Academy of Sciences.The study area,Jiangjia Ravine,is about 48.6 km2 and characterized by intense tectonism.Accumulated clastic detritus is the main source of the materials in the debris flows when an intense rainfall occurs.The recorded highest density and sediment transport are 2370 kg/m3 and 6.079×106 kg/s,respectively.The ravine is now called the“debris flow museum”in China and supplies advantageous research conditions. 展开更多
关键词 observation station sediment transport highest density intense tectonismaccumulated clastic detritus debris flows Dongchuan research station
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Hazard driven debris flow simulation and risk evaluation in the Karakorum Mountain ranges, Northern Pakistan 认领 引用
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作者 Nisar Ali Shah Muhammad Shafique +3 位作者 Benazeer Iqbal Muhammad Ishfaq Tanveer Ahmed Israr Ullah 《Journal of Groundwater Science and Engineering》 2026年第2期252-270,共19页
Northern Pakistan is highly susceptible to debris flows due to its complex geomorphic structure,steep topography,climate change,glaciation,monsoonal rainfall,active seismicity,deforestation,and human activities.Despit... Northern Pakistan is highly susceptible to debris flows due to its complex geomorphic structure,steep topography,climate change,glaciation,monsoonal rainfall,active seismicity,deforestation,and human activities.Despite this,high-resolution,quantitative assessments of debris flow hazards are limited,constraining effective disaster risk management.This study aims to model a representative debris flow event in the Ghizer District to predict potential deposition areas and support emergency preparedness and sustainable land-use planning in this hazard-prone region.High-resolution Unmanned Aerial Vehicle(UAV)-derived topographic data were integrated with the Rapid Mass Movement Simulation(RAMMSDF)model to simulate debris flow runout for three release scenarios,representing distinct and combined initiation zones.Satellite images and field validation were used to delineate release and erosion zones,while vulnerability and risk were assessed by mapping exposed elements including 210 buildings and a population of 1,500 and applying spatial multi-criteria analysis within a Geographic Information System(GIS)framework.The numerical simulation for the most critical event,Scenario 3(representing simultaneous dual-source initiation),yielded the highest magnitude results with a total flow volume of 193,717 m3,a peak flow height of 12.96 m,and a maximum impact pressure of 992.28 kPa.Vulnerability mapping identified infrastructure and agricultural land as the most exposed.Risk assessment showed that the combined scenario posed the greatest threat to local assets and communities.The study demonstrates that debris flow dynamics in high-mountain environments are non-linearly sensitive to initial release volumes and the interaction between multiple flow sources.Topographic controls such as channel confinement and slope variations are the primary drivers of flow intensity and energy dissipation.This research establishes a replicable,data-driven framework for quantitative risk assessment in data-limited mountainous regions.The resulting high-resolution hazard and risk maps provide a scientific basis for defining land-use restrictions,prioritizing slope stabilization,and guiding the placement of emergency infrastructure to support disaster-resilient development in northern Pakistan. 展开更多
关键词 Debris flow Runout simulation GIS Vulnerability
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Hardware-in-the-loop space debris simulation method using dynamic optical detection scenarios 认领 引用
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作者 Chengeng Gong Na Li +2 位作者 Huijie Zhao Qingbo Gan Jingyi Yan 《Astronomical Techniques and Instruments》 CSCD 2026年第2期145-157,共13页
The threat posed by space debris to space security is continuously increasing.Optical observation is the main detection method for space debris,but the variety of observation geometries in available measurement datase... The threat posed by space debris to space security is continuously increasing.Optical observation is the main detection method for space debris,but the variety of observation geometries in available measurement datasets is limited.Therefore,simulations are required to supplement observational data.Hardware-in-the-loop(HIL)simulations can provide high-quality simulated optical detection data at a reasonable cost,but existing hardware-in-the-loop methods are only adapted to simple motion scenarios.To extend the simulation ability to complex space motion scenarios,here we propose an optical hardware-in-the-loop space debris simulation method,relying on dynamic detection scenarios,that uses a collaborative scenario-modality-feature simulation scheme to simulate variable observation geometries and to obtain sequential space debris simulation data covering a variety of modalities and scenarios.We apply the proposed space debris detection method to ground-based and space-based simulation experiments and analyze target features within the simulated detection data to demonstrate the usefulness of such simulations.Our simulation method is applicable to space debris optical detection under diverse observation conditions and to multidimensional space debris feature characterization. 展开更多
关键词 Space debris HIL simulation Optical detection Dynamic observation geometry
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Mission planning for repeated multi-spacecraft non-contact debris removal 认领 引用 被引量：3
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作者 Hang XU Lujiang LIU +3 位作者 Yanning GUO Youmin GONG Bin SONG Guangfu MA 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第10期448-466,共19页
Non-contact debris removal methods are fuel-efficient in a single operation compared to contact-based strategies as spacecraft don’t need to match debris velocity.To comprehensively analyze this scheme,maneuvering sc... Non-contact debris removal methods are fuel-efficient in a single operation compared to contact-based strategies as spacecraft don’t need to match debris velocity.To comprehensively analyze this scheme,maneuvering schemes for maximum debris removal with minimum fuel consumption,including task assignment,sequence planning,and trajectory planning,must be formulated.The coupling between variables’dimensions and optimization results in task assignment poses challenges,as debris removal is repetitive and uncertain,leading to a vast search space.This paper proposes a novel Greedy Randomized Adaptive Search Procedure with Large Neighborhood and Crossover Mechanisms(GRASP-LNCM)to address this problem.The hybrid dynamic iteration mechanism improves computational efficiency and enhances the optimality of results.The model innovatively considers unsuccessful single removal by using a quantitative method to assess removal percentage.In addition,to improve the efficiency of sequence and trajectory planning,a Suboptimal Search Algorithm(SSA)based on the Lambert property and accelerated Multi-Revolution Lambert Problem(MRLP)solving strategy is established.Finally,a real Iridium-33 debris removal mission is studied.The simulation demonstrates that the proposed algorithm achieves state-of-the-art performance in several typical scenarios.Compared to the contact-based scheme,the new one is simpler,saving more fuel under certain conditions. 展开更多
关键词 Greedy randomized adaptive search procedure Non-contact method Optimization Planning Space debris
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