水土保持研究2024，Vol.31Issue(6)：86-95,10.DOI:10.13869/j.cnki.rswc.2024.06.002
太湖上游西苕溪流域水沙产出特征及影响因素
Characteristics and Causes of Runoff and Sediment Production in the Xitiaoxi Watershed in the Upper Reaches of Taihu Basin
摘要
Abstract
[Objective]The aims of this study are to quantitatively analyze the spatiotemporal distribution of runoff and sediment production in the watershed,to investigate its main causes,and to provide scientific references for soil and water conservation and ecological management in the Xitiaoxi watershed of Lake Taihu.[Methods]The Xitiaoxi watershed in the upper reaches of Taihu basin was selected as the study area.The SWAT model and related statistical methods were applied to study the spatial and temporal characteristics of runoff-sediment variability and its driving forces in the watershed during 2016-2020.[Results](1)The output of runoff and sediment in the watershed was mainly concentrated in the rainy season(April—September),and the average annual runoff depth was 588 mm,accounting for 63.2％of the year.The average sediment production was 0.83 t/hm2,accounting for 75.1％of the year.(2)Runoff production in the watershed was mainly concentrated in the upper southwestern part and the lower northeastern part,while the central part was relatively low,which was basically consistent with the distribution of rainfall in the basin(correlation coefficient R=0.96).(3)Sediment production in the watershed was mainly concentrated in the northwest plain area and the central river valley area,where the slope gradient was less than 15°or more than 25°and the land type was cultivated land.(4)Soil erosion in the watershed was mainly slight erosion,and it had a good linear function relationship with the cultivated land area,that is,y=0.0202x+0.539(R2=0.748,p＜0.001),and the average annual sediment production in the watershed was about(1.02+0.44)t/hm2.[Conclusion]The runoff and sediment production in the watershed exhibits significant spatiotemporal distribution patterns.Runoff distribution is generally consistent with rainfall distribution,sediment yield is closely related to the area of cultivated land and slope.Water resource management should comprehensively consider these key factors in the future.关键词
水沙输出特征/成因分析/SWAT模型/西苕溪流域Key words
characteristics of water-sediment production/causes analysis/SWAT model/Xitiaoxi watershed分类
地球科学引用本文复制引用
汪澳,高俊峰,闫人华,严嘉龙..太湖上游西苕溪流域水沙产出特征及影响因素[J].水土保持研究,2024,31(6):86-95,10.基金项目
国家重点研发计划项目(2023YFC3208704) （2023YFC3208704）
国家自然科学基金(42071052 （）
42371043) （）
中国科学院南京地理与湖泊研究所自主部署科研项目(NIGLAS2022GS10) （NIGLAS2022GS10）
