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[1]KANG Jingling,DING Wenfeng,HAN Haoyu,et al.Relationship Between Runoff and Sediment on Differernt Time Scales in Chabagou Watershed[J].Research of Soil and Water Conservation,2021,28(05):81-87.

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Relationship Between Runoff and Sediment on Differernt Time Scales in Chabagou Watershed

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 05 Page number: 81-87 Column: Public date: 2021-08-20

Title:: Relationship Between Runoff and Sediment on Differernt Time Scales in Chabagou Watershed

Author(s):: KANG Jingling¹,DING Wenfeng^1,2,HAN Haoyu¹,GUO Yiwei¹,WANG Yiran¹; (1.Changjiang River Scientific Research Institute,Wuhan 430010,China; 2.Research Center on Mountain Torrent & Geologic Disaster Prevention of Ministry of Water Resources,Wuhan 430010,China)

Keywords:: runoff and sediment relationship; time scale; flood event; sediment discharge; Chabagou watershed

CLC:: P333

DOI:: -

Abstract:: To further reveal the changes of relationship between runoff and sediment and its influencing factors on different time scales in Chabagou watershed,based on the data of annual precipitation,runoff and sediment discharge,rainfall,runoff and sediment discharges in 106 times floods events from 1970 to 2016,the change trend and abrupt change points of runoff and sediment discharge on inter-annual scale,runoff-sediment relationships on inter-annual scale and on flood event scale were analyzed by using the non-parameter Mann-Kendall test method and functional model regression method. The results showed that annual precipitation in Chabagou watershed increased significantly,while runoff and sediment discharge had decreased significantly from 1970 to 2016,and the abrupt change points were detected in 1986,1991 and 2001,and 1982,respectively. The change trends of precipitation and sediment discharge on flood event scale were consistent with the change trends of precipitation and sediment discharge on inter-annual scale,while the change trend of runoff on flood event scale was opposite with inter-annual scale. The study period was divided into three different research periods: 1970—1981,1982—2000 and 2001—2016 according to the abrupt changing points. The relationships of both the flood peak discharge and runoff depth with sediment discharge on two time scales were significantly described by power function. The runoff and sediment relationship and its influencing factors were complexed in Chabagou watershed,which was mainly related to the benefits of soil and water conservation measures such as check dams and vegetation restoration,and the increase of frequency and intensity of extreme rainfall.

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Last Update: 2021-08-20