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.

Shuilong Yuan;Zhanbin Li;Li Chen;Peng Li;Zeyu Zhang;Junzheng Zhang;Anna Wang;kunxia Yu

State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi'an University of Technology,Xi'an,710048,Shaanxi,China;Key Laboratory of National Forestry Administration on Ecological Hydrology and Disaster Prevention in Arid Regions,Xi'an University of Technology,Xi'an,710048,Shaanxi,China;Desert Research Institute,Las Vegas,NV,89012,USA;Institute of Soil and Water Conservation Investigation and Planning of Shaanxi Province,Xi'an,710100,Shaanxi,China

国际水土保持研究（英文）

[1]Shuilong Yuan;Zhanbin Li;Li Chen;Peng Li;Zeyu Zhang;Junzheng Zhang;Anna Wang;kunxia Yu-.Effects of a check dam system on the runoff generation and concentration processes of a catchment on the Loess Plateau)[J].国际水土保持研究（英文）,2022(01):86-98

Effects,check,system,runoff,generation,concentration,processes,catchment,Loess,Plateau,important,soil,conservation,engineering,measure,more,than,dams,are,constructed,across,these,play,vital,role,reducing,floods,sediment,However,effects,still,unclear,particularly,when,they,deployed,watershed,management,This,study,examined,modulated,by,typical,By,simulating,scenarios,various,numbers,using,distributed,physically,model,were,analyzed,results,showed,that,presence,reduced,peak,discharge,volume,extended,duration,reduction,was,most,significant,among,three,factors,substantially,decreased,coefficient,rate,greater,rainstorms,shorter,return,periods,longer,increased,capacity,regulating,storing,average,flattened,instantaneous,unit,hydrograph,reveals,influencing,mech,anism,hydrological,under,heavy,conditions,provides,theoretical,basis,evaluating,numerous,regional,hydrology,resources

0.452425