[1]Yang Shuping,He Zhonghua,Wang Maoqiang,et al.Study on the Rainfall and Runoff Mechanism of Media Structure in Typical Karst Basin[J].Research of Soil and Water Conservation,2024,31(03):49-60.[doi:10.13869/j.cnki.rswc.2024.03.005]
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Study on the Rainfall and Runoff Mechanism of Media Structure in Typical Karst Basin
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 03
Page number:
49-60
Column:
Public date:
2024-04-30
- Title:
- Study on the Rainfall and Runoff Mechanism of Media Structure in Typical Karst Basin
- CLC:
- P429
- DOI:
- 10.13869/j.cnki.rswc.2024.03.005
- Abstract:
- [Objective] The aims of this study are to investigate the rainfall-runoff mechanism in the medium structure of karst basin, and to provide theoretical references for the rational utilization of water resources and flood and drought prevention in the Central Guizhou region. [Methods] 20 typical watersheds in the central Guizhou were selected as the study sample areas, the spatial and temporal distribution characteristics of rainfall and runoff in the watersheds were analyzed, multi-scale rainfall-runoff simulation by using Support Vector Regression(SVR)was carried out, and the rainfall-runoff mechanism of the watershed media structure was analyzed by using Spearman's method. [Results](1)Rainfall in the Central Guizhou from 1979 to 2021 showed a slowly increasing trend(5.02 mm/a)and runoff showed a slowly decreasing trend(-0.017 billion m3/a), and both of them unevenly distributed in the space in general.(2)SVR trained by radial basis kernel function(RBF)was relatively accurate, and simulation accuracy decreased in the order: fall>winter>spring>year-round>summer.(3)The single-factor single factor effects decreased in the order: non-karst(0.764)>low activity strong acidic soil(0.566)>peak forest geomorphic type(0.459)>grassland(0.456)>continuity dolomite karst(-0.435)>cultivated vegetation(-0.426).(4)Single-factor coupled effects decreased in the order: soil cover structure(0.714)>geomorphic combination structure(-0.529)>rock composition structure(-0.446)>vegetation distribution structure(0.323), and multi-factor coupling influence decreased in the order: 234(-0.702)>1234(-0.679)>23(0.607)>34(-0.604)>24(-0.547)>134(-0.544)>13(0.507). [Conclusion] SVR is suitable for the simulation of rainfall-runoff process in the central Guizhou region, and the structure of watershed media has a large influence on rainfall-runoff.
- References:
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Last Update:
2024-04-30