[Objective]Accurate precipitation prediction plays a crucial role in regional flood prevention and mitigation,water resources management,and socioeconomic development.However,the precipitation process is influenced by...[Objective]Accurate precipitation prediction plays a crucial role in regional flood prevention and mitigation,water resources management,and socioeconomic development.However,the precipitation process is influenced by the interaction of multi-scale meteorological factors and shows significant nonlinearity and spatiotemporal heterogeneity.Traditional numerical models fail to effectively capture its complex evolution patterns.[Methods]Based on random forest stacking techniques,six hybrid prediction models were constructed:KNN-LSTM,SARIMA-KNN,SARIMA-Prophet,SARIMA-LSTM,Prophet-LSTM,and Prophet-KNN.Monthly precipitation data from 1990 to 2023 at station 58238 in Nanjing were used for modeling,with data from 1990 to 2020 used as the training set and data from 2021 to 2023 used as the testing set.The regional generalization ability was validated using contemporaneous data from 12 independent meteorological stations in Jiangsu Province.[Results]The result showed that the SARIMA-LSTM hybrid model,which integrated the seasonal decomposition advantage of SARIMA with the long-term dependency capturing ability of LSTM,achieved the highest prediction accuracy on the testing set,with R2=0.904,MAE=16.16 mm,and MSE=477.87 mm2.The regional generalization validation demonstrated that the model achieved R2=0.919,MAE=15.33 mm,and MSE=537.52 mm2 across 13 meteorological stations in Jiangsu Province,indicating good spatial generalization capability.[Conclusion]The constructed hybrid models exhibit excellent predictive performance,providing reliable technical support for precipitation prediction in the lower Yangtze River region.This holds significant application value for the optimization of regional water resource allocation and disaster early warning.展开更多
目的为解决新型冠状病毒肺炎期间流感异常发病率而导致的流感建模预测困难,本研究建立了季节性自回归求和移动平均(seasonal autoregressive integrated moving average,SARIMA)、长短期记忆神经网络(long-Short Term Memory,LSTM)模型...目的为解决新型冠状病毒肺炎期间流感异常发病率而导致的流感建模预测困难,本研究建立了季节性自回归求和移动平均(seasonal autoregressive integrated moving average,SARIMA)、长短期记忆神经网络(long-Short Term Memory,LSTM)模型以及基于奇异谱分析(Singular spectrum analysis,SSA)的SSA-LSTM模型,为新冠疫情期间山西省流感的高精度预测提供有效的科学依据。方法收集2014年第14周至2021年第13周山西省流感共7年的周度流感监测数据,利用时间序列分解(Seasonal and Trend decomposition using Loess,STL)分析其季节特征。以2014年第14周至2020年第13周的流感样就诊比(the ratio of influenza-like illness,ILI%)作为训练集分别建立SARIMA、LSTM、SSA-LSTM模型,以2020年第14周至2021年第13周(新冠疫情期间)的ILI%作为测试集,比较三种模型的拟合、预测性能,确定最佳模型。结果受新冠疫情的影响,山西省流感自2020年初变化复杂,ILI%出现了明显的下降。SSA-LSTM的均方误差(Mean Squared Error,MSE)、平均绝对误差(Mean Absolute Error,MAE)、均方根误差(Root Mean Squared Error,RMSE)在拟合、预测结果中均达到了最小。结论SSA-LSTM模型对新冠肺炎疫情期间山西省异常下降的流感发病率进行预测更加精准,为流感有效防控提供一定的参考,也为疫情期间其他传染病异常发病率的预测提供了方法学上的参照。展开更多
目的探讨季节性差分自回归移动平均模型(seasonal autoregressive integrated moving average model,SARIMA)和长短时记忆神经网络(long short term memory,LSTM)预测深圳市宝安区手足口病发病趋势的可行性。方法选取2009—2018年深圳...目的探讨季节性差分自回归移动平均模型(seasonal autoregressive integrated moving average model,SARIMA)和长短时记忆神经网络(long short term memory,LSTM)预测深圳市宝安区手足口病发病趋势的可行性。方法选取2009—2018年深圳市宝安区的手足口病月发病率作为训练集分别构建SARIMA模型和LSTM神经网络,预测2019年1—12月的手足口病月发病率,并与真实值比较。结果相对最优模型SARIMA(0,0,2)(0,1,2)12和LSTM神经网络对2010—2018年的深圳市宝安区手足口病月发病率进行拟合,拟合性能中LSTM神经网络的均方误差(mean squared error,MSE)和均方根误差(root mean squared error,RMSE)均高于SARIMA模型,而平均绝对误差(mean absolute error,MAE)和平均绝对百分比误差(mean absolute percentage error,MAPE)均低于SARIMA模型,表明两种模型的拟合性能基本一致。使用两种模型预测2019年1—12月手足口病月发病率,SARIMA模型预测性能的MSE、RMSE、MAE、MAPE分别为2310.199,48.065,31.990和1.002,LSTM模型预测性能的MSE、RMSE、MAE、MAPE分别为1078.899,32.847,22.046和0.958,表明LSTM神经网络的预测性能高于SARIMA模型。结论LSTM神经网络能更好地预测深圳市宝安区手足口病发病趋势,可为相关部门制定手足口病防控策略提供依据。展开更多
摘要[Objective]Accurate precipitation prediction plays a crucial role in regional flood prevention and mitigation,water resources management,and socioeconomic development.However,the precipitation process is influenced by the interaction of multi-scale meteorological factors and shows significant nonlinearity and spatiotemporal heterogeneity.Traditional numerical models fail to effectively capture its complex evolution patterns.[Methods]Based on random forest stacking techniques,six hybrid prediction models were constructed:KNN-LSTM,SARIMA-KNN,SARIMA-Prophet,SARIMA-LSTM,Prophet-LSTM,and Prophet-KNN.Monthly precipitation data from 1990 to 2023 at station 58238 in Nanjing were used for modeling,with data from 1990 to 2020 used as the training set and data from 2021 to 2023 used as the testing set.The regional generalization ability was validated using contemporaneous data from 12 independent meteorological stations in Jiangsu Province.[Results]The result showed that the SARIMA-LSTM hybrid model,which integrated the seasonal decomposition advantage of SARIMA with the long-term dependency capturing ability of LSTM,achieved the highest prediction accuracy on the testing set,with R2=0.904,MAE=16.16 mm,and MSE=477.87 mm2.The regional generalization validation demonstrated that the model achieved R2=0.919,MAE=15.33 mm,and MSE=537.52 mm2 across 13 meteorological stations in Jiangsu Province,indicating good spatial generalization capability.[Conclusion]The constructed hybrid models exhibit excellent predictive performance,providing reliable technical support for precipitation prediction in the lower Yangtze River region.This holds significant application value for the optimization of regional water resource allocation and disaster early warning.
摘要目的为解决新型冠状病毒肺炎期间流感异常发病率而导致的流感建模预测困难,本研究建立了季节性自回归求和移动平均(seasonal autoregressive integrated moving average,SARIMA)、长短期记忆神经网络(long-Short Term Memory,LSTM)模型以及基于奇异谱分析(Singular spectrum analysis,SSA)的SSA-LSTM模型,为新冠疫情期间山西省流感的高精度预测提供有效的科学依据。方法收集2014年第14周至2021年第13周山西省流感共7年的周度流感监测数据,利用时间序列分解(Seasonal and Trend decomposition using Loess,STL)分析其季节特征。以2014年第14周至2020年第13周的流感样就诊比(the ratio of influenza-like illness,ILI%)作为训练集分别建立SARIMA、LSTM、SSA-LSTM模型,以2020年第14周至2021年第13周(新冠疫情期间)的ILI%作为测试集,比较三种模型的拟合、预测性能,确定最佳模型。结果受新冠疫情的影响,山西省流感自2020年初变化复杂,ILI%出现了明显的下降。SSA-LSTM的均方误差(Mean Squared Error,MSE)、平均绝对误差(Mean Absolute Error,MAE)、均方根误差(Root Mean Squared Error,RMSE)在拟合、预测结果中均达到了最小。结论SSA-LSTM模型对新冠肺炎疫情期间山西省异常下降的流感发病率进行预测更加精准,为流感有效防控提供一定的参考,也为疫情期间其他传染病异常发病率的预测提供了方法学上的参照。
摘要目的探讨季节性差分自回归移动平均模型(seasonal autoregressive integrated moving average model,SARIMA)和长短时记忆神经网络(long short term memory,LSTM)预测深圳市宝安区手足口病发病趋势的可行性。方法选取2009—2018年深圳市宝安区的手足口病月发病率作为训练集分别构建SARIMA模型和LSTM神经网络,预测2019年1—12月的手足口病月发病率,并与真实值比较。结果相对最优模型SARIMA(0,0,2)(0,1,2)12和LSTM神经网络对2010—2018年的深圳市宝安区手足口病月发病率进行拟合,拟合性能中LSTM神经网络的均方误差(mean squared error,MSE)和均方根误差(root mean squared error,RMSE)均高于SARIMA模型,而平均绝对误差(mean absolute error,MAE)和平均绝对百分比误差(mean absolute percentage error,MAPE)均低于SARIMA模型,表明两种模型的拟合性能基本一致。使用两种模型预测2019年1—12月手足口病月发病率,SARIMA模型预测性能的MSE、RMSE、MAE、MAPE分别为2310.199,48.065,31.990和1.002,LSTM模型预测性能的MSE、RMSE、MAE、MAPE分别为1078.899,32.847,22.046和0.958,表明LSTM神经网络的预测性能高于SARIMA模型。结论LSTM神经网络能更好地预测深圳市宝安区手足口病发病趋势,可为相关部门制定手足口病防控策略提供依据。