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[1]FU Yanchao,WANG Yousheng,YANG Zhi,et al.Analysis of Characteristics and Causes of Water and Sediment Changes in Recent 30 Years[J].Research of Soil and Water Conservation,2023,30(01):224-232.[doi:10.13869/j.cnki.rswc.2023.01.005]

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Analysis of Characteristics and Causes of Water and Sediment Changes in Recent 30 Years

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 01 Page number: 224-232 Column: Public date: 2023-01-10

Title:: Analysis of Characteristics and Causes of Water and Sediment Changes in Recent 30 Years

Author(s):: FU Yanchao¹, WANG Yousheng², YANG Zhi³, LIU Chang¹, ZHANG Xiaoming², WEI Tianxing¹, XIN Yan², MA Wentao³, XIE Gang², REN Zhengyan³; (1.College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China; 2.China Research Institute of Water Resources and Hydropower Research, Simulation and Regulation of Water Cycle in River Basin, Beijing 100048, China; 3.Soil and Water Conservation Monitoring Station of Ningxia Hui Autonomous Region, Yinchuan 750002, China)

Keywords:: soil and water conservation and desertification control; Kushui River; water and sediment change; SSC-Q loop curve; land-use

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2023.01.005

Abstract:: Kushui River with high sediment content is an important tributary of the Yellow River in Ningxia. In order to explore the variation of water and sediment in the basin in the past 30 years and its driving mechanism, we selected the hydrological, meteorological and remote sensing data of Kushui River Basin from 1989 to 2019, and used Mann-Kendall trend test, concentration analysis, construction of land use transfer matrix and other statistical analysis methods to analyze the variation characteristics of water-sediment sequence and water-sediment relationship in the past 30 years. The results showed that:(1)the annual runoff(p<0.1)and sediment transport volume(p<0.05)of the Kushui River had decreased significantly; annual runoff and sediment concentrated between May and August and had a high sediment transport concentration:(2)by analyzing the water-sediment relationship curve, the parameter indicating the erosion degree in the basin had a significant downward trend; during floods, the clockwise and positive ‘8' hysteresis types increased, indicating that sediment transport capacity had weakened, and it had gradually shifted from short and rapid to a gentle and long-lasting sediment transport model;(3)human activities had always been the primary driving factors for the decrease in runoff and sediment transport in the Kushui River Basin in the past 30 years, with contributions reaching 73.65% and 95.67%, respectively. The conversion of large-scale farmland to grassland in the mountainous areas of the southern part of the basin effectively reduced the amount of sediment coming from the upper reaches of the Kushui River. The measures of returning farmland to grassland had positive effects on promoting soil and water conservation and coordinating the relationship between water and sediment.

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Last Update: 2023-01-10