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[1]Dai Zhongshan,Li Haifeng.Variation of Runoff and Sediment in the Main Tributaries of the Upper Ganjiang River in the Period from 2011 to 2020[J].Research of Soil and Water Conservation,2024,31(01):178-186,198.[doi:10.13869/j.cnki.rswc.2024.01.030]

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Variation of Runoff and Sediment in the Main Tributaries of the Upper Ganjiang River in the Period from 2011 to 2020

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 01 Page number: 178-186,198 Column: Public date: 2024-02-20

Title:: Variation of Runoff and Sediment in the Main Tributaries of the Upper Ganjiang River in the Period from 2011 to 2020

Author(s):: Dai Zhongshan^1,3, Li Haifeng^1,2; (1.Nanchang Key Laboratory of Landscape and Environment, School of Environmental and Land Resource Management, Jiangxi Agricultural University, Nanchang 330045, China; 2.Jiangxi Provincical Key Laboratory of Soil Erosion and Prevention, Nanchang 330029, China; 3.College of Resources & Environment, Huazhong Agricultural University, Wuhan 430070, China)

Keywords:: runoff; sediment; cumulative anomaly; double cumulative curve; soil and water conservation

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2024.01.030

Abstract:: [Objective] The aims of this study are to explore the variation characteristics of runoff and sediment in the main tributaries of Ganjiang River watershed, to quantify the relationship between water and soil conservation measures and sediment transport in the upper reaches of Ganjiang River, and to provide a theoretical basis for soil erosion comprehensive management in Ganjiang River watershed. [Methods] Based on the measured runoff and sediment data of four main tributaries in Ganjiang River watershed from 2011 to 2020, hydrological analysis, cumulative anomaly and double cumulative curve method were used to study runoff and sediment variation. Meanwhile, linear regression analysis was carried out to quantify the relationship between soil and water conservation measures and sediment transport based on the statistical data of soil and water conservation measures in Ganzhou. [Results](1)Variation trend of rainfall and runoff in the main tributaries of the upper reaches of Ganjiang river was roughly the same. The sediment transport of the main tributaries of the upper Ganjiang River changed with the variation of runoff, presenting a situation of abundant water and abundant sediment, poor water and poor sediment.(2)Sediment discharge in the four basins showed an intermittent trend of increasing(decreasing)and then decreasing(increasing)at two-year or three-year intervals.(3)Linear regression analysis quantified the response of sediment transport modulus to the scale of soil and water conservation measures: M_z=0.019 S_{water conservation forest}+5.126(M_z representing the annual sediment transport module of Zhangshui, S_{water conservation forest} representing the annual increase area of soil and water conservation measures in the corresponding tributary watershed).(4)Based on the structure of soil and water conservation measures in Ganzhou, the optimal area proportion of newly incremental water and soil conservation measures was put forward: enclosure management(52.0%～60.0%), fruit forest(22%～25%), water conservation forest(20%～23%), grass planting(2%～3%), slope improvement(2%～3%). [Conclusion] Variation trend of rainfall and runoff in the main tributaries of the upper reaches of Ganjiang river was roughly the same between the year of 2011 and the year of 2020, except the year of 2018. The factors affecting sediment transport of the main tributaries of the upper Ganjiang River are complex. Soil and water conservation measures were the dominant human activities for variation of runoff and sediment load in Zhangshui River Watershed. There was a significant positive correlation between sediment transport modulus and newly increased forest area in Zhangshui River Watershed.

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Last Update: 2024-02-20