Effects of a check dam system on the runoff generation and concentration processes of a catchment on the Loess Plateau
作者机构：State Key Laboratory of Eco-hydraulics in Northwest Arid Region of ChinaXi'an University of TechnologyXi'an710048ShaanxiChina Key Laboratory of National Forestry Administration on Ecological Hydrology and Disaster Prevention in Arid RegionsXi'an University of TechnologyXi'an710048ShaanxiChina Desert Research InstituteLas VegasNV89012USA Institute of Soil and Water Conservation Investigation and Planning of Shaanxi ProvinceXi'an710100ShaanxiChina
出 版 物：《International Soil and Water Conservation Research》 (国际水土保持研究（英文）)
年 卷 期：2022年第10卷第1期
页 面：86-98页
核心收录：
学科分类：0710[理学-生物学] 081504[工学-水利水电工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0903[农学-农业资源与环境] 0901[农学-作物学] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）]
基 金：This research was supported by the National Natural Science Foundation of China(51779204,51879281,5207910) Program for Science&Technology Innovation Research Team of Shaanxi Province(2018TD-037) the Research Fund of the State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi'an University of Technology(Grant No.2018KFKT-1).
主 题：Check dam system Runoff generation Runoff concentration Instantaneous unit hydrograph Loess Plateau
摘 要：As an important soil and water conservation engineering measure,more than 100,000 check dams are constructed across the Loess Plateau;these dams play a vital role in reducing floods and sediment in the region.However,the effects of check dams on hydrologic process are still unclear,particularly when they are deployed as a system for watershed soil and water management.This study examined the watershed hydrologic process modulated by the check dam system in a typical Loess Plateau catchment.By simulating scenarios with various numbers of check dams using a distributed physically-based hydro-logical model,the effects of the number of check dams on runoff generation and concentration were analyzed for the study catchment.The results showed that the presence of check dams reduced the peak discharge and the flood volume and extended the flood duration;the reduction effect on peak discharge was most significant among the three factors.The system of check dams substantially decreased the runoff coefficient,and the runoff coefficient reduction rate was greater for rainstorms with shorter return periods than for rainstorms with longer return periods.The check dams increased the capacity of the catchment regulating and storing floods and extended the average runoff concentration time in the catchment that flattened the instantaneous unit hydrograph.This study reveals the influencing mech-anism of check dam system on the watershed hydrological process under heavy rainstorm conditions and provides a theoretical basis for evaluating the effects of numerous check dams on regional hydrology and water resources on the Loess Plateau.
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