[1]Wang Ao,Gao Junfeng,Yan Renhua,et al.Characteristics and Causes of Runoff and Sediment Production in the Xitiaoxi Watershed in the Upper Reaches of Taihu Basin[J].Research of Soil and Water Conservation,2024,31(06):86-95.[doi:10.13869/j.cnki.rswc.2024.06.002]
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Characteristics and Causes of Runoff and Sediment Production in the Xitiaoxi Watershed in the Upper Reaches of Taihu Basin
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 06
Page number:
86-95
Column:
Public date:
2024-12-10
- Title:
- Characteristics and Causes of Runoff and Sediment Production in the Xitiaoxi Watershed in the Upper Reaches of Taihu Basin
- Keywords:
- characteristics of water-sediment production; causes analysis; SWAT model; Xitiaoxi watershed
- CLC:
- P333
- DOI:
- 10.13869/j.cnki.rswc.2024.06.002
- 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.
- References:
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Last Update:
2024-12-10