水土保持研究2024，Vol.31Issue(3)：49-60,12.DOI:10.13869/j.cnki.rswc.2024.03.005
典型喀斯特流域介质结构的降雨-径流机制研究
Study on the Rainfall and Runoff Mechanism of Media Structure in Typical Karst Basin
摘要
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 decreasedin 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.关键词
流域介质结构/支持向量回归(SVR)/降雨—径流机制Key words
watershed media structure/support vector regression(SVR)/rainfall-runoff regime分类
天文与地球科学引用本文复制引用
杨树平,贺中华,王茂强,潘杉,陈莉会,谭红梅,顾小林,许明金..典型喀斯特流域介质结构的降雨-径流机制研究[J].水土保持研究,2024,31(3):49-60,12.基金项目
贵州省水利厅自然科学基金项目(KT202237) （KT202237）
贵州省自然科学基金项目(黔科合基础-ZK[2023]重点028) （黔科合基础-ZK[2023]重点028）
国家自然科学基金项目(u1612441,41471032) （u1612441,41471032）
