干旱区研究2023，Vol.40Issue(11)：1765-1775,11.DOI:10.13866/j.azr.2023.11.06
关川河上游水沙变化特征及其对降水和水保措施的响应
Characteristics of water and sand changes in the upper Guanchuan River and its response to precipitation and water conservation measures
摘要
Abstract
In order to further explore the influence of precipitation and soil and water conservation measures on runoff sediment,and to gain an in-depth understanding of the driving factors of water and sand changes in small and medium-sized rivers of the Yellow River,M-K test,Morlet wavelet,linear regression and structural equation modeling were used to study the changes in precipitation and the area of soil and water conservation measures in the upper Guanchuan River from 1957-2021,as well as their the mechanism and process of action were studied.The results showed that annual precipitation showed a non-significant decreasing trend(P＞0.05),runoff modulus and sand transport modulus showed a significant decreasing trend(P＜0.05),and the area of soil and water conservation measures showed an increasing trend.The response of runoff modulus and sand transport modulus to precipitation got weakened,and the response to soil and water conservation measures was gradually strengthened;the key path of precipitation and soil and water conservation measures affecting the change of water and sand was"area of soil and water conservation measures→runoff modulus",followed by"area of soil and water conservation measures→runoff→sand transport modulus",then"precipitation→runoff modulus",and finally"precipitation→runoff modulus→sand transport modulus".The total effect of precipitation on water and sand change is 0.42 and 0.38 respectively,while the total effect of soil and water conservation measures on water and sand change is-0.72 and-0.65 respectively.The main factor affecting water and sand change in the watershed is the area of soil and water conservation measures,and the secondary factor is the amount of precipitation.关键词
水沙变化/水土保持措施/结构方程模型/关川河上游Key words
changes in water and sediment/soil and water conservation measures/structural equation model/upper Guanchuan River引用本文复制引用
王晓雨,马瑞,张富,胡彦婷,王玲莉,蒋承洋,陈素娥..关川河上游水沙变化特征及其对降水和水保措施的响应[J].干旱区研究,2023,40(11):1765-1775,11.基金项目
甘肃省优博基金(22JR5RA840) （22JR5RA840）
