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| DOI：10.13522/j.cnki.ggps.2023069 |
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| Attribution Analysis of Runoff and Sediment Changes at Different Scales in the Qingshui River Basin |
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HUANG Kang, LU Kexin, SHEN Zhenzhou, ZHANG Guojun, REN Zongping, LI Peng
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1. State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi’an 710048, China;
2. Yellow River Institute of Hydraulic Research, YRCC, Zhengzhou 450003, China;
3. NingXia Soil and Water Conservation Monitoring Station, Yinchuan 750002, China
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| Abstract: |
| 【Objective】Quantify the driving factors of runoff and sediment changes in the Qingshui River basin, and provide a theoretical basis for soil erosion control in the upper Yellow River basin.【Method】Based on the measured runoff and sediment data from three hydrological stations in the upper, middle and lower reaches of the Ningxia Qingshui River basin from 1970 to 2019 and meteorological data from meteorological stations in the basin, the Mann-Kendall test method and Pettitt test method were used to analyze the trend and abrupt change of hydro-meteorological series at different scales in the basin, and the Budyko hypothesis-based The elasticity coefficient method, the double cumulative curve method and the comparison of the slope rate of change of cumulative volume method were used for attribution analysis of water and sand variation at different scales in the basin.【Result】During the period from 1970 to 2019, the annual runoff depth of the whole Qingshui River basin shows a significant increase trend, and the annual sediment transport modulus shows no significant decrease trend. The annual runoff depth and annual sediment transport modulus of the upper, middle and upper reaches of the basin show a significant decrease trend, but the annual precipitation and annual potential evapotranspiration have not changed significantly; Compared with that before the abrupt change, the contribution rate of human activities to the reduction of annual runoff in the upstream, upper and middle reaches and the whole basin is 99.9%-114.3%, 77.5%-104.0% and -117.4% - -74.0% respectively, and the contribution rate to the reduction of annual sediment transport is 104.7%-116.4%, 110.2%-132.2% and 113.0%-139.0% respectively.【Conclusion】Human activities, such as irrigation by yellow diversion and soil and water conservation measures, are the main factors influencing the water and sand changes in the Qingshui River basin in the last 50 years. |
| Key words: Qingshui River; runoff and sediment change; elastic coefficient method; double cumulative curve method; cumulative slope rate of change comparison method |
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