关键词:
hydrological simulation
long short-term memory
extreme gradient boosting
support vector regression
SWAT_Glacier model
Tianshan Mountains
摘要:
The accurate simulation and prediction of runoff in alpine glaciated watersheds is of increasing importance for the comprehensive management and utilization of water *** this study,long shortterm memory(LSTM),a state-of-the-art artificial neural network algorithm,is applied to simulate the daily discharge of two data-sparse glaciated watersheds in the Tianshan Mountains in Central *** other classic machine learning methods,namely extreme gradient boosting(XGBoost)and support vector regression(SVR),along with a distributed hydrological model(Soil and Water Assessment Tool(SWAT)and an extended SWAT model(SWAT_Glacier)are also employed for *** paper aims to provide an efficient and reliable method for simulating discharge in glaciated alpine regions that have insufficient observed meteorological *** two typical basins in this study are the main tributaries(the Kumaric and Toxkan rivers)of the Aksu River in the south Tianshan Mountains,which are dominated by snow and glacier meltwater and *** comparative analysis indicates that simulations from the LSTM shows the best agreement with the *** performance metrics Nash-Sutcliffe efficiency coefficient(NS)and correlation coefficient(R^(2))of LSTM are higher than 0.90 in both the training and testing periods in the Kumaric River Basin,and NS and R^(2) are also higher than 0.70 in the Toxkan River *** to classic machine learning algorithms,LSTM shows significant advantages over most evaluating *** also has high NS value in the training period,but is prone to overfitting the *** with the widely used hydrological models,LSTM has advantages in predicting accuracy,despite having fewer data ***,LSTM only requires meteorological data rather than physical characteristics of underlying *** an extension of SWAT,the SWAT_Glacier model shows good adaptability in discharge simulation,outperforming the original SWAT model,but at