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[1]MA Yali,NIU Zuirong,ZHANG Rui,et al.Relationship Between the Evolution of Runoff and Sediment and Rainfall and Rainfall Erosivity in the Taohe River Basin[J].Research of Soil and Water Conservation,2023,30(04):90-97,109.[doi:10.13869/j.cnki.rswc.2023.04.025.]

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Relationship Between the Evolution of Runoff and Sediment and Rainfall and Rainfall Erosivity in the Taohe River Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 04 Page number: 90-97,109 Column: Public date: 2023-06-10

Title:: Relationship Between the Evolution of Runoff and Sediment and Rainfall and Rainfall Erosivity in the Taohe River Basin

Author(s):: MA Yali, NIU Zuirong, ZHANG Rui, ZHENG Zhiqin, SUN Dongyuan; (College of Water Resources and Hydropower Engineering, Gansu Agricultural University, Lanzhou 730070, China)

Keywords:: sediment load change; water-sediment relationship; elastic coefficient method; rainfall erosivity; Yellow River Basin

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2023.04.025.

Abstract:: [Objective] The aim of this study is to reveal the complex changes of water and sediment and the relationship between water and sediment under the coupling effect of climate change and human activities, as well as the influence of rainfall erosivity and the response mechanism of runoff and sediment transport changes, and then to provide scientific reference for water and soil loss prevention and ecological construction in the basin. [Methods] The daily precipitation data of six meteorological stations in Taohe River Basin and its surrounding areas and monthly runoff and sediment data of downstream control stations were used. Multivariate statistical analysis method, water-sediment curve, correlation coefficient, grey correlation degree and elastic analysis method were used to analyze and study the variability of runoff, sediment, rainfall (P) and rainfall erosivity (R) and their interaction relationship. [Results] The runoff in Taohe River Basin decreased significantly from 1956 to 2019 with the linear change rate of -2.8×10⁷m³/a and the abrupt change occurred in 1987. The sediment decreased significantly with the linear change rate of -4.61×10⁵t/a and the abrupt change occurred in 2003. The rainfall and rainfall erosivity did not increase significantly without obvious mutation. R in the upper and middle reaches of Taohe River basin was less than that in the lower reaches with R in summer(626.33)>R in autumn(125.31)>R in spring(122.22)>R in winter(0), and R in summer was 71.67% and the influence of rainfall erosivity in summer was the greatest. The distribution of P and R was opposite. R was greater in the lower reaches of the basin where P was relatively little, and R was less in the upper and middle reaches of the basin where P was relatively great. Runoff and sediment were generated in different part of the basin with runoff producing in the upper and middle reaches and sediment producing in the lower reaches. R had the greatest influence on sediment, when P had the greatest influence on runoff. The sediment caused by unit rainfall erosivity had been decreased since 2003. Human activities that affected the sediment accounted for about 90%, and climate factors accounted for 10%. [Conclusion] The sediment in the Taohe Basin is mainly influenced by human activities under the changing environment, and the runoff and sediment in the basin have different sources. Compared with P, more attention should be paid to the effect of R on the sediment change.

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Last Update: 2023-06-10