[1]Fu Sijia,Zhang Huilan,Yang Jun.Characteristics of Sand Transport and Key Driving Factors of Flooding Events in the Qingshui River Basin[J].Research of Soil and Water Conservation,2023,30(06):49-56.[doi:10.13869/j.cnki.rswc.2023.06.016]
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Characteristics of Sand Transport and Key Driving Factors of Flooding Events in the Qingshui River Basin
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 06
Page number:
49-56
Column:
Public date:
2023-10-10
- Title:
- Characteristics of Sand Transport and Key Driving Factors of Flooding Events in the Qingshui River Basin
- Keywords:
- sediment load; flooding event; sediment rating curve; runoff erosion power; Qingshui River
- CLC:
- TV143
- DOI:
- 10.13869/j.cnki.rswc.2023.06.016
- Abstract:
- [Objective] The aims of this study are to reveal the response patterns of water and sand to key environmental factors, and to provide a theoretical basis for promoting integrated soil and water conservation management in the Yellow River basin. [Methods] Based on the theory of runoff erosion power, the Random Forest method and the daily measured runoff and sediment data in the Qingshui River basin, we analyzed the sediment transport characteristics and key driving factors during flooding events. [Results] The flooding and sand transport in the basins showed significant spatial variation, with differences in the main parameters affecting the flooding and sand transport processes in different sub-basins. The results of the random forest showed that the main influencing factors were runoff depth, flood ephemeris and peak flow in areas where small floods were frequent, and runoff depth, peak flow and mean flow in areas where medium floods were frequent, respectively. The introduction of composite indicators for runoff processes in the explanatory variables of erosion and sand production could better represent the influence of natural precipitation and basin substrate properties on erosion and sand production during sub-floods, and the accuracy of the fit was higher than that of the traditional runoff-sand transport relationship. [Conclusion] Runoff erosion power is more appropriate for describing sub-flood-scale water-sediment relationships than traditional single runoff parameters such as runoff depth, mean flow or peak flood flow.
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Last Update:
2023-10-10