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Interannual succession of phytoplankton community in a canyon-shaped drinking water reservoir during the initial impoundment period:Taxonomic versus functional groups 认领 引用 被引量：2
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作者 Yi Hou Ya Cheng +6 位作者 Kai Li Meng Yang Kangzhe Huang Gang Ji Ruikang Xue Tinglin Huang Gang Wen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第5期454-468,共15页
During the initial impoundment period of a canyon-shaped reservoir,the water body fluctuated violently regarding water level,hydrological condition,and thermal stratification.These variations may alter the structure o... During the initial impoundment period of a canyon-shaped reservoir,the water body fluctuated violently regarding water level,hydrological condition,and thermal stratification.These variations may alter the structure of phytoplankton community,resulting in algal blooms and seriously threatening the ecological security of the reservoir.It is of great significance to understand the continuous changes of phytoplankton in the initial impoundment period for the protection of reservoir water quality.Therefore,a two-year in-situ monitoring study was conducted on water quality and phytoplankton in a representative canyonshaped reservoir named Sanhekou and the interannual changes of phytoplankton community and its response to environmental changes during the initial impoundment period were discussed at taxonomic versus functional classification levels.The results showed that the total nitrogen and permanganate index levels were relatively high in the first year due to rapid water storage and heavy rainfall input,and the more stable hydrological conditions in the second year promoted the increase of algae density and the transformation of community,and the proportion of cyanobacteria increased significantly.The succession order of phytoplankton in the first year of the initial impoundment periodwas Chlorophyta-Bacillariophyta-Chlorophyta,or J/F/X1-P/MP/W1-A/X1/MP,respectively.And the succession order in the second year was Cyanobacteria/Chlorophyta-Bacillariophyta-Chlorophyta,or LM/G/P-P/A/X1-X1/J/G.Water temperature,relativewater column stability,mixing depth,and pHwere crucial factors affecting phytoplankton community succession.This study revealed the interannual succession law and driving factors of phytoplankton in the initial impoundment period and provided an important reference for the operation management and ecological protection of canyon-shaped reservoirs. 展开更多
关键词 Canyon-shaped reservoir Functional groups Initial impoundment Interannual succession Water quality
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Analysis of working behavior of Jinping-I Arch Dam during initial impoundment 认领 引用 被引量：10
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作者 Shi-yong Wu Wei Cao Jiang Zheng 《Water Science and Engineering》 EI CAS CSCD 2016年第3期240-248,共9页
To study the stress, deformation, and seepage pressure during the initial impoundment of the Jinping-I Arch Dam, monitoring analysis and numerical calculation were used in a dam behavior analysis that focused on the w... To study the stress, deformation, and seepage pressure during the initial impoundment of the Jinping-I Arch Dam, monitoring analysis and numerical calculation were used in a dam behavior analysis that focused on the working behavior of the dam during the late period of the initial impoundment up to the end of November 2014. The numerical calculation was performed based on feedback analysis of the deformation and stress of the arch dam through inversion of the elastic moduli(E) of the dam body and foundation, using a three-dimensional finite element model for the linear elastic material of the arch dam. The main monitoring indices presented insignificant changes in the late period of the initial impoundment, and the results of feedback analysis were consistent with monitoring results. Analysis results also show that the deformations of the dam body and dam foundation were within the design range; the dam stress distributions were normal, with values lower than the design control criteria; and the seepage flows through the dam body and dam foundation were lower than the design drainage capacity of the deep-well pump house, demonstrating that the Jinping-I Arch Dam was in good working condition, and the initial impoundment had been successfully completed. The results of the working behavior analysis of the Jinping-I hydropower project during the initial impoundment can provide references for safe operation of similar projects. 展开更多
关键词 Dam safety monitoring Working behavior Elastic modulus Dam impoundment Jinping-I hydropower project
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Current situation and forecast of environmental risks of a typical lead-zinc sulfide tailings impoundment based on its geochemical characteristics 认领 引用 被引量：3
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作者 Tao Chen Zi-Ang Yan +5 位作者 Damao Xu Minghui Wang Jian Huang Bo Yan Xianming Xiao Xunan Ning 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第7期120-128,共9页
The potential environmental implications of a Pb(Lead)-Zn(Zinc)sulfide tailing impoundment were found to be dependent on its geochemical characteristics.One typical lead-zinc sulfide tailing impoundment was studied.Te... The potential environmental implications of a Pb(Lead)-Zn(Zinc)sulfide tailing impoundment were found to be dependent on its geochemical characteristics.One typical lead-zinc sulfide tailing impoundment was studied.Ten boreholes were set with the grid method and 36 tailings were sampled and tested.According to the results of metal content analysis,the tailing samples contained considerably high contents of heavy metals,ranging from 6.99 to 89.0 mg/kg for Cd,75.3 to 602 mg/kg for Cu,0.53%to 2.63%for Pb and 0.30%to 2.54%for Zn.Most of the heavy metals in the sample matrix showed a uniform concentration distribution,except Cd.Cd,Pb,Zn,and Mn were associated with each other,and were considered to be the dominant contributors based on hierarchical cluster analysis.XRD,SEM and XPS were employed for evaluation of the tailing weathering characteristics,confirming that the tailings had undergone intensive weathering.The maximum potential acidity of the tailings reached 244 kg H2SO4on;furthermore,the bioavailability of heavy metals like Pb,Cd,Cr,Cu,and Zn was 37.8%,12.9%,12.2%,5.95%,and 5.46%respectively.These metals would be potentially released into drainage by the weathering process.Analysis of a gastrointestinal model showed that Pb,Cr,Ni and Cu contained in the tailings were high-risk metals.Thus,control of the heavy metals’migration and their environmental risks should be planned from the perspective of geochemistry. 展开更多
关键词 Pb-Zn tailings impoundment Geochemical characteristics Distribution of the metals Weathering process Environmental risk assessment
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Effective stress law for rock masses and its application in impoundment analysis based on deformation reinforcement theory 认领 引用 被引量：1
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作者 CHENG Li LIU Yao-ru +2 位作者 PAN Yuan-wei YANG Qiang LV Zheng 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第1期218-229,共12页
Reservoir impoundment is related to several hydraulic engineering concerns,including irreversible valley contractions,landslides and reservoir-induced earthquakes.However,these phenomena,such as valley contractions,ar... Reservoir impoundment is related to several hydraulic engineering concerns,including irreversible valley contractions,landslides and reservoir-induced earthquakes.However,these phenomena,such as valley contractions,are hardly to be explained by the conventional method.The scientific understanding of water effects during impoundment and their hazards to hydraulic structure are needed.The effective stress law for fissured rock masses is introduced in the elasto-plastic model employing the Drucker-Prager criterion and implemented in the three dimension(3D)nonlinear finite element method(FEM)program Three-dimensional FINite Element(TFINE).The slope deforms towards river-way during impoundment since the increasing pore pressure in fissures changes stress state and leads to additional plastic deformation in the rock materials.The value of Biot coefficient and the influence of water on rock materials are discussed in detail.Thus,the mechanism of slope deformation during the impoundment of Jinping-I arch dam is revealed,and the deformation is accurately measured.The application of the effective stress law provides a method to consider stress assessment,deformation evaluation and stability estimate of hydraulic structures during the impoundment process.This is a beneficial exploration and an improvement of hydraulic engineering design. 展开更多
关键词 effective stress law elasto-plastic FEM model Biot coefficient impoundment valley contractions
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Earthquake dynamic response behavior of Xiangchong valley type tailings impoundment in Yunnan, China 认领 引用 被引量：3
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作者 REN Zhe WANG Kun +5 位作者 ZHANG Qi-shu XU Ze-min TANG Zheng-guang CHEN Ji-pu YANG Ji-qing XU Zong-heng 《Journal of Mountain Science》 SCIE CSCD 2018年第1期82-99,共18页
Tailings impoundments can potentially collapse due to damage caused by earthquakes,which has frequently occurred around the world.This study takes the proposed valley type tailings impoundment in Yunnan as the researc... Tailings impoundments can potentially collapse due to damage caused by earthquakes,which has frequently occurred around the world.This study takes the proposed valley type tailings impoundment in Yunnan as the research object to analyze the dynamic response behavior under earthquake action with both numerical simulation and physical model test(1:300).The results of both tests show that the dynamic response of the valley type tailings impoundment is characterized by"medium stiffness effect",in other words,in a certain range,the"softer"the unsaturated tailings sand is,the more energy it can dissipate,which leads the decrease of the value of the acceleration amplification factor.In addition,the peak acceleration of the monitoring points increases with the vertical elevation,which indicates that the"elevation amplification effect"exists in the tailings impoundment dynamic response.The middle part of the outer side of the raised embankment reacts more sensitive than the crest,which is similar to the slope dynamic response.The starter dam reacts sensitively under the earthquake excitation,which should be given more attention during the seismic design.The dynamic response rules reflected by the numerical simulation are consistent with the results monitored on the physical model test,although there are some differences between their values.The dynamic response rules of the valley type tailings impoundment can provide basis for the design of the similar projects in this region. 展开更多
关键词 Tailings impoundment Dynamic response Shaking table test Medium stiffness effect
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The effect of large reservoirs impoundment to the spatial and temporal variations of regional crustal deformation in Hubei Province, China 认领 引用 被引量：1
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作者 Wenbin Shen Xueqing Zhang 《Geodesy and Geodynamics》 2016年第5期377-386,共10页
The total capacity of Three Gorges Reservoir（TGR） and Danjiangkou Reservoir（DJR） is large and has significant seasonal fluctuations, which give rise to crustal instability. In this research, we focus on studying t... The total capacity of Three Gorges Reservoir（TGR） and Danjiangkou Reservoir（DJR） is large and has significant seasonal fluctuations, which give rise to crustal instability. In this research, we focus on studying the temporal and spatial variation of crustal deformation in Hubei Province caused by reservoir impoundment of TGR and DJR.The Digital Elevation Model, historical hydrological information, GPS monitoring data and load-induced deformation model are combined to monitor the crustal deformation. The modeled results indicate that in the trapezoidal area between the TGR and DJR, the average vertical deformations at different latitudes have different variation tendencies. The vertical deformation modulus and fluctuation amplitude are larger at the latitude of 33 N/32.5 N from 2003 to 2006 and at the latitude of 31 N/32.5 N from 2008 to 2014, while the latter are much larger than the former. Moreover, from2008 to 2014, the frequency and the intensity of seismic activities are all enhanced significantly in this region. The modeled results at the GPS sites are consistent with the vertical displacement of GPS monitoring results in trends and the waveform. It can be inferred that the seasonal deformation is elastic. The horizontal deformation components have the same variation trends with that at each GPS monitoring station,which demonstrates that the whole region is moving toward the southeast. The spatial variation of crustal deformation demonstrates that the impoundment of TGR in2003 causes significant vertical displacements, with the maximum modulus of 32 mm downward located in Xiangjiang River＇s estuary. When the water storage increases, the maximum value will become larger, and the location will move toward the upstream.Besides, the earthquakes occurred more frequently in the region with maximum deformation modulus. 展开更多
关键词 Three Gorges Reservoir Danjiangkou Reservoir Impoundment Crustal deformation Earthquake
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Gravity change and its mechanism after the first water impoundment in Three Gorges Project 认领 引用
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作者 孙少安 项爱民 +1 位作者 朱平 申重阳 《Acta Seismologica Sinica(English Edition)》 2006年第5期522-529,共8页
In this paper we have analyzed precise gravity survey and gravity effects resulted from water loading, crustal deformation, ground water level change and precipitation before and after the water impoundment in the Thr... In this paper we have analyzed precise gravity survey and gravity effects resulted from water loading, crustal deformation, ground water level change and precipitation before and after the water impoundment in the Three Gorges Reservoir. We found that： ① In dam area of the reservoir, gravity effect resulted from water load increase is the most significant, maximum gravity change is 200×10^-8 m/s^2, but this effect is limited in amplitude and range. Gravity change can be observed about 5 km offshore. The gravity change caused by ground water level change is regional; and the impact of precipitation on it should not be neglected. ② At head area of the reservoir, the maximum gravity change is near Xiangxi. Monitoring the variation of gravity field and further study should continue in the future. 展开更多
关键词 the Three Gorges Project the first water impoundment gravity change
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The analysis on reservoir sediment deposition and downstream river channel scouring after impoundment and operation of TGP 认领 引用 被引量：1
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作者 Lu Jinyou Huang Yue Wang Jun 《Engineering Sciences》 2011年第3期113-120,共8页
According to the measured data after impoundment and operation of the Three Gorges Reservoir,the reservoir sediment deposition and downstream river channel scouring are described briefly and compared with the research... According to the measured data after impoundment and operation of the Three Gorges Reservoir,the reservoir sediment deposition and downstream river channel scouring are described briefly and compared with the research results achieved in the demonstration stage.It is indicated through analysis that the reservoir sediment deposition and downstream river channel scouring during 8-year impoundment and operation are still within the original forecast,so the original forecasting results are feasible.The further observation and comparison should be conducted because the comparison between the observed data and the original forecast is not so sufficient in time and the prototype observation and related research work should be strengthened in the future. 展开更多
关键词 Three Gorges Project （TGP） trial impoundment reservoir sediment deposition downstream river channel scouring
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The interaction mechanism of dam-reservoir-foundation during impoundment:Case study of the Xiluodu Project,China 认领 引用
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作者 Linfei ZHANG Xibin LI +1 位作者 Lei XU Qingwen REN 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2026年第1期401-415,共15页
Clarifying dam-reservoir-foundation interactions during reservoir impoundment is fundamental to dam safety assessment.However,the internal dynamics and spatiotemporal evolution of these interactions remain elusive due... Clarifying dam-reservoir-foundation interactions during reservoir impoundment is fundamental to dam safety assessment.However,the internal dynamics and spatiotemporal evolution of these interactions remain elusive due to multifactorial complexities.To investigate the interaction mechanism in the dam-reservoir-foundation system during impoundment,a feedback-driven dynamic double-displacement boundary method is developed based on observed large-scale irreversible translational deformation phenomena in reservoir banks,implemented within a nonlinear finite element framework.Subsequently,real-time dynamic numerical simulations of the Xiluodu Project incorporating actual impoundment schedules and dam construction sequences are conducted.The results show that the simulated and monitored deformation behaviors of the damreservoir-foundation system exhibit good agreement.Valley contraction is primarily driven by large-scale mountain translational deformation,while fluctuations in reservoir water level induced characteristic oscillations in the near-dam valley deformation curves.Reservoir water pressure causes foundation settlement,whereas sustained valley contraction induces foundation uplift.Dam crest displacement shows clear water-level dependency,and valley contraction caused abutment compression,which drives upstream-directed displacement of the arch dam.These two effects exhibit linear superposition behavior.This study provides critical insights for the safety assessment of high arch dams. 展开更多
关键词 high arch dam displacement boundary method impoundment valley contraction interaction mechanism
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Monthly change of community structure of zoobenthos in Xiangxi Bay after impoundment of the Three Gorges Reservoir,China 认领 引用 被引量：2
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作者 SHAO Meiling XIE Zhicai +1 位作者 YE Lin CAI Qinghua 《Frontiers in Biology》 2007年第2期229-234,共6页
Xiangxi Bay,a typical bay of the Three Gorges Reservoir(TGR)in China,was formed in June 2003 after the impoundment of the TGR.We investigated the community structure of zoobenthos in Xiangxi Bay from August 2003 to Au... Xiangxi Bay,a typical bay of the Three Gorges Reservoir(TGR)in China,was formed in June 2003 after the impoundment of the TGR.We investigated the community structure of zoobenthos in Xiangxi Bay from August 2003 to August 2004.Benthic abundance and biomass were calculated per unit area of sediment.A total of 26 taxa were identified.They included two families of Lamellibranchia(7.7%of the total taxa number),two families of Oligochaeta(50%),Chironomidae(38.5%),and one other animal(3.8%).The average density and biomass were 276 ind./m2 and 0.301 g/m2,respectively.Oligochaetes and chironomids constituted the major groups,and Limnodrilus hoffmeisteri,Procladius sp.,Branchiura sowerbyi,Tubificidae sp1.and Polypedilum scalaenum group sp.were the common taxa in this reservoir system.Among them,L.hoffmeisteri and Procladius sp.were the dominant species,and contributed 37.0%and 28.3%of the total density,respectively.The standing crop of zoobenthos in Xiangxi Bay was relative low,compared with other similar reservoirs.Our studies demonstrate that the standing crop increased gradually with time.The total density and biomass in August 2004 were 8.8 and 14.3 times those of the initial impoundment,separately.Oligochaetes did not become the sole dominant group,indicating that the sediment loading in Xiangxi Bay may be not serious. 展开更多
关键词 Three Gorges Reservoir(TGR) initial impoundment Xiangxi Bay zoobenthos density biomass
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Did the reservoir impoundment trigger the Wenchuan earthquake? 认领 引用 被引量：6
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作者 Yong Chen 《Science China Earth Sciences》 CAS 2009年第4期431-433,共3页
January 16, 2009 issue of Science magazine published, in its ' News of the Week' section, an article entitled 'A Human Trigger for the Great Quake of Sichuan?'. The article boldly proposed, 'Ziping... January 16, 2009 issue of Science magazine published, in its ' News of the Week' section, an article entitled 'A Human Trigger for the Great Quake of Sichuan?'. The article boldly proposed, 'Zipingpu reservoir may have triggered the Wenchuan earthquake'[1]. Incidentally, similar reports had appeared in the media such 展开更多
关键词 than Did the reservoir impoundment trigger the Wenchuan earthquake
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Displacement characteristics and prediction of Baishuihe landslide in the Three Gorges Reservoir 认领 引用 被引量：11
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作者 LI De-ying SUN Yi-qing +3 位作者 YIN Kun-long MIAO Fa-sheng Thomas GLADE Chin LEO 《Journal of Mountain Science》 SCIE CSCD 2019年第9期2203-2214,共12页
In order to reach the designated final water level of 175 m, there were three impoundment stages in the Three Gorges Reservoir, with water levels of 135 m, 156 m and 175 m. Baishuihe landslide in the Reservoir was cho... In order to reach the designated final water level of 175 m, there were three impoundment stages in the Three Gorges Reservoir, with water levels of 135 m, 156 m and 175 m. Baishuihe landslide in the Reservoir was chosen to analyze its displacement characteristics and displacement variability at the different stages. Based on monitoring data, the landslide displacement was mainly influenced by rainfall and drawdown of the reservoir water level. However, the magnitude of the rise and drawdown of the water level after the reservoir water level reached 175 m did not accelerate landslide displacement. The prediction of landslide displacement for active landslides is very important for landslide risk management. The time series of cumulative displacement was divided into a trend term and a periodic term using the Hodrick-Prescott(HP) filter method. The polynomial model was used to predict the trend term. The extreme learning machine(ELM) and least squares support vector machine(LS-SVM) were chosen to predict theperiodic term. In the prediction model for the periodic term, input variables based on the effects of rainfall and reservoir water level in landslide displacement were selected using grey relational analysis. Based on the results, the prediction precision of ELM is better than that of LS-SVM for predicting landslide displacement. The method for predicting landslide displacement could be applied by relevant authorities in making landslide emergency plans in the future. 展开更多
关键词 Landslide Three Gorges Reservoir Impoundment process Displacement prediction
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Distribution and sources of polycyclic aromatic hydrocarbons and phthalic acid esters in water and surface sediment from the Three Gorges Reservoir 认领 引用 被引量：8
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作者 Li Lin Lei Dong +6 位作者 Xiaoyang Meng Qingyun Li Zhuo Huang Chao Li Rui Li Wenjun Yang John Crittenden 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2018年第7期271-280,共10页
After the impoundment of the Three Gorges Reservoir（TGR）, the hydrological situation of the reservoir has changed greatly. The concentration and distribution of typical persistent organic pollutants in water and sed... After the impoundment of the Three Gorges Reservoir（TGR）, the hydrological situation of the reservoir has changed greatly. The concentration and distribution of typical persistent organic pollutants in water and sediment have also changed accordingly. In this study, the concentration, distribution and potential sources of 16 polycyclic aromatic hydrocarbons（PAHs） and 6 phthalic acid esters（PAEs） during the water drawdown and impoundment periods were investigated in water and sediment from the TGR. According to our results, PAHs and PAEs showed temporal and spatial variations. The mean ΣPAH and ΣPAE concentrations in water and sediment were both higher during the water impoundment period than during the water drawdown period. The water samples from the main stream showed larger ΣPAH concentration fluctuations than those from tributaries. Both the PAH and PAE concentrations meet the Chinese national water environmental quality standard（GB 3838-2002）. PAH monomers with 2–3 rings and 4 rings were dominant in water, and 4-ring and 5–6-ring PAHs were dominant in sediment. Di-n-butyl phthalate（DBP） and di-2-ethylhexyl phthalate（DEHP）were the dominant PAE pollutants in the TGR. DBP and DEHP had the highest concentrations in water and sediment, respectively. The main source of PAHs in water from the TGR was petroleum and emissions from coal and biomass combustion, whereas the main sources of PAHs in sediments included coal and biomass combustion, petroleum, and petroleum combustion. The main source of PAEs in water was domestic waste, and the plastics and heavy chemical industries were the main sources of PAEs in sediment. 展开更多
关键词 Three Gorges Reservoir（TGR） Polycyclic aromatic hydrocarbons（PAHs） Phthalic acid esters（PAEs） Water impoundment period Water drawdown period Sources
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Numerical analysis and geophysical monitoring for stability assessment of the Northwest tailings dam at Westwood Mine 认领 引用 被引量：15
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作者 Coulibaly Yaya Belem Tikou Cheng LiZhen 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2017年第4期701-710,共10页
The Westwood Mine aims to reuse the tailings storage facility #1(TSF #1) for solid waste storage, but,downstream of the Northwest dike is considered critical in terms of stability. This paper uses numerical modeling a... The Westwood Mine aims to reuse the tailings storage facility #1(TSF #1) for solid waste storage, but,downstream of the Northwest dike is considered critical in terms of stability. This paper uses numerical modeling along with geophysical monitoring for assessing the Northwest dike stability during the restoration phase. The impact of waste rock deposition in the upstream TSF #1 is considered. The geophysical monitoring is based on electrical resistivity methods and was used to investigate the internal structure of the dike embankment in different deposition stages. The numerical simulations were performed with SLOPE/W code. The results show a factor of safety well above the minimum recommended value of 1.5. Geophysical monitoring revealed a vertical variation in the electrical resistivity across the dike, which indicates a multilayer structure of the embankment. Without any current in situ data, the geophysical monitoring helped estimating the nature of the materials used and the internal structure of the embankment. These interpretations were validated by geological observation of geotechnical log of the embankment. Based on this study, it is recommended that the water polishing pond be partly filled before waste rock is deposited in TSF #1. In addition, to ensure the stability of the dike, the piezometric head monitoring prior to and during waste rock deposition is recommended. 展开更多
关键词 Mine tailings impoundment Dike Embankment Numerical analysis Factor of safety Geophysical monitoring
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Model-scale tests to examine water pressures acting on potentially buoyant underground structures in clay strata 认领 引用 被引量：5
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作者 Zhisheng Ren Qixian Lu +2 位作者 Kaiwen Liu Pengpeng Ni Guoxiong Mei 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2022年第3期861-872,共12页
Throughout the service life, underground structures are subjected to transient and sustained hydrostatic pressures. The reservoir impoundment results in an increase in water level, as well as hydraulic gradient,which ... Throughout the service life, underground structures are subjected to transient and sustained hydrostatic pressures. The reservoir impoundment results in an increase in water level, as well as hydraulic gradient,which can endanger the uplift performance of infrastructure. In uplift design, a reduction factor is often suggested for buoyant force acting on underground structures in clays due to the time lag effect.However, the mechanism of pore pressure generation in clays is not fully understood. This investigation presents a novel U-shaped test chamber to assess the pore pressure generation with time in the horizontal branch subjected to an increase in reservoir level in the left vertical branch. A mathematical model is developed to explain the time lag effect of pore pressure generation. The test program also involves the evaluation of uplift pressure acting on foundation model in the right vertical branch due to adjacent reservoir impoundment. It is found that the time lag effect of pore pressure generation in clays can be observed irrespective of hydraulic gradient, but a higher hydraulic gradient can lead to a faster response in pore pressure sensors. A reduction factor of 0.84-0.87 should be considered to reduce the conservatism of uplift design. 展开更多
关键词 Buoyant force Reservoir impoundment Pore pressure generation Reduction factor Uplift pressure Time lag effect
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Status of two Coreius species in the Three Gorges Reservoir,China 认领 引用 被引量：4
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作者 夏雨果 J.LLORET +6 位作者 李钟杰 张堂林 叶少文 李为 苑晶 H.A.C.C.PERERA 刘家寿 《Chinese Journal of Oceanology and Limnology》 CSCD 2016年第1期19-33,共15页
Dam construction alters natural flow regimes which,in turn,cause significant changes in fish communities during and after impoundment. The construction of the Three Gorges Reservoir,from impoundment of the Changjiang(... Dam construction alters natural flow regimes which,in turn,cause significant changes in fish communities during and after impoundment. The construction of the Three Gorges Reservoir,from impoundment of the Changjiang(Yangtze) River,China,may have affected native fish species. Thus,the status of two lotic freshwater fish species,Coreius heterodon and C.guichenoti,were monitored in the Three Gorges Reservoir,including fish abundance,individual composition,growth,condition,and mortality. Data on both species were gathered from upstream,midstream and downstream areas of the reservoir and,where available,from studies published before and after dam construction. Lower abundance,slower growth,a less diversified age structure,poorer fish condition(indicated by hepatosomatic index) and higher mortalities were recorded in sites nearest the dam compared with upstream areas. Furthermore,after final impoundment,individual Coreius species inhabiting the area changed,with young individuals becoming more abundant,while upstream of the reservoir the two Coreius species became smaller at a given age. The results show that the status of the two Coreius species was subject to dramatic changes after impoundment. 展开更多
关键词 Three Gorges Reservoir Coreius species status age profile growth impoundment
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Seismic analysis of the Xiluodu reservoir area and insights into the geometry of seismogenic faults 认领 引用 被引量：3
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作者 Hongfu Lei Qincai Wang +3 位作者 Cuiping Zhao Ce Zhao Jinchuan Zhang Jun Li 《Earthquake Science》 2022年第5期371-386,共16页
The Xiluodu(XLD)reservoir is the second largest reservoir in China and the largest in the Jinsha River basin.The occurrence of two M>5 earthquakes after reservoir impoundment has aroused great interest among seismo... The Xiluodu(XLD)reservoir is the second largest reservoir in China and the largest in the Jinsha River basin.The occurrence of two M>5 earthquakes after reservoir impoundment has aroused great interest among seismologists and plant operators.We comprehensively analyzed the seismicity of the XLD reservoir area using precise earthquake relocation results and focal mechanism solutions and found that the seismicity of this area was weak before impoundment.Following impoundment,earthquake activity increased significantly.The occurrence of M≥3.5 earthquakes within five years of impoundment also appear to be closely related to rapid rises and falls in water level,though this correlation weakened after five years because earthquake activity was far from the reservoir area.Earthquakes in the XLD reservoir area are clustered;near the dam(Area A),small faults are intermittently distributed along the river,while Area B is composed of multiple NW-trending left-lateral strikeslip faults and a thrust fault and Area C is composed of a NW-trending left-lateral strike-slip main fault and a nearly EWtrending right-lateral strike-slip minor fault.The geometries of the deep and the shallow parts of the NW-trending fault differ.Under the action of the NW-trending background stress field,a series of NW-trending left-lateral strike-slip faults and NE-trending thrust faults in critical stress states were dislocated due to the stress caused by reservoir impoundment.The two largest earthquakes in the XLD reservoir area were tectonic earthquakes that were directly triggered by impoundment. 展开更多
关键词 Xiluodu reservoir area double-difference location focal mechanism solution fault geometry reservoir impoundment
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Large-scale toppling slope under water level fluctuation of reservoir:A case of Yunnan Province,China 认领 引用 被引量：2
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作者 Leilei Jin Yufeng Wei +3 位作者 Fei Ye Wenxi Fu Jianfeng Liu Shuwu Li 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第8期3034-3046,共13页
Landslides induced by reservoir inundation are common in Southwest China,negatively influencing hydropower stations.TheWunonglong hydropower station dam was constructed in the upper reaches of the Lancang River,accord... Landslides induced by reservoir inundation are common in Southwest China,negatively influencing hydropower stations.TheWunonglong hydropower station dam was constructed in the upper reaches of the Lancang River,accordingly causing the water level at the Lajinshengu slope to increase by 30 m.A tension crack with a visible depth of 8 m was observed in the upper sector of the Lajinshengu slope after reservoir impoundment for 170 d.In the following days,numerous cracks appeared on the surface of the slope,and the maximum displacement of the slope reached 3.22 m.Then,a large-scale active deformation body within the Lajinshengu slope formed with an area of 2.62×105m2and a volume of 1.65×107m3.Detailed field investigations,on-site monitoring,and centrifugal model tests were carried out to analyze the surface features,deformation characteristics,and failure mechanism of the Lajinshengu slope.The results show that the slope is an ancient landslide,divided into two parts(i.e.zone A and zone B)by the gully.Zone B is a traction landslide caused by the displacement of zone A.The longterm inundation weakens the soft rock at the slope foot,intensifying the toppling of bedrock and consequently triggering the sliding of the overburden in zone A.The failure mode of the Lajinshengu slope is a typical case of toppling-sliding failure,and the underlying rock toppling drives the overlying sliding.In addition,early identification methods for toppling deformation covered by overburdened soil were proposed based on monitoring data and deformation signs. 展开更多
关键词 Lajinshengu slope Reservoir impoundment Early identification Failure mechanism Toppling-sliding slope failure mode
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A stability evaluation method for deep-seated toppling in the upper Lancang river,Southwestern China 认领 引用
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作者 Yibing Ning Huiming Tang +3 位作者 Jianbing Peng Yanjun Shen John V.Smith Bocheng Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第7期2388-2410,共23页
Deep-seated toppling in the upper reaches of the Lancang River,southwest China involves deformations exceeding 100 m in depth.The slope deformation is initiated by river downcutting and evolves distinctive characteris... Deep-seated toppling in the upper reaches of the Lancang River,southwest China involves deformations exceeding 100 m in depth.The slope deformation is initiated by river downcutting and evolves distinctive characteristics with a depth of river incision.In this study,we propose a system for evaluating the stability of deep-seated toppled slopes in different evolutionary stages.This system contains identification criteria for each evolutionary stage and provides the corresponding stability evaluation methods.Based on the mechanical and kinematic analysis of slope blocks,the specific stage of slope movement can be identified in the field through outcrop mapping,in situ tests,surface displacement monitoring,and adit and borehole explorations.The stability evaluation methods are established based on the limiting equilibrium theory and the strain compatibility between the undisturbed zone and the toppled zone.Finally,several sample slopes in different evolution stages have been investigated to verify the applicability and accuracy of the proposed stability evaluation system.The results indicate that intense tectonic activity and rapid river incision lead to a maximum principal stress ratio exceeding 10 near the slope surface,thus triggering widespread toppling deformations along the river valley.When considering the losses of joint cohesion during the further rotation process,the safety factor of the slope drops by 7%e28%.The self-stabilization of toppling deformation can be recognized by the layer symmetry configuration after the free rotation of the deflected layers.Intensely toppled rock blocks mainly suffer sliding failures beyond the layer symmetry condition.The factor of safety of the K73 rockslide decreased from 1.17 to 0.87 by considering the development of the potential sliding surface and the toesaturated zone. 展开更多
关键词 Stability evaluation Deep-seated toppling Evolutionary process Reservoir impoundment Rock slope
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Tectonic environment and cause of earthquakes in the Three Gorges reservoir area 认领 引用
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作者 Li Qiang Zhao Xu +2 位作者 Cai Jin＇an Liu Ruifeng Zhao Cuiping 《Geodesy and Geodynamics》 EI 2011年第1期13-20,共8页
Seismotectonics in the Three Gorges reservoir area is investigated by using the P-wave tomography with earthquakes that occurred before the impoundment of the reservoir. The result indicates that most of these events ... Seismotectonics in the Three Gorges reservoir area is investigated by using the P-wave tomography with earthquakes that occurred before the impoundment of the reservoir. The result indicates that most of these events occurred in or around the velocity-gradient belts between high-velocity and low-velocity anomalies. These belts have similar characteristics to buried-fauh zones. Stresses generated by movement of partially molten upper-mantle materials and thermal stress may have jointly contributed to the seismic activities along the faults and such buried faults, and possibly activated new earthquake ruptures. 展开更多
关键词 Three Gorges reservoir area tectonic environment impoundment earthquake cause buried fault
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