首页|A new approach to simulate watershed sediment graphs

A new approach to simulate watershed sediment graphs

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
Soil loss management requires reliable data for assessing the conditions prevailing in a watershed.Suspended sediment concentration(SSC)is one of the indicators of soil loss,and its data and asso-ciated properties are essential for integrated watershed management.However,until now,practical methods for estimating the temporal variation of SSC at the watershed scale,i.e.,a sediment graph(SG),using measured data have been given less attention.Therefore,the current study was planned to simulate the SG through conceptual modeling of the soil erosion process and sediment yield.The Galazchai Watershed in West Azerbaijan Province,Iran,was selected as a case study.In this regard,the isochrone histograms were initially prepared using two methods of the longitudinal channel profile and spatially distributed travel time.Soil erosion was calculated in each isochrone segment using the Revised Universal Soil Loss Equation(RUSLE),applying the lumped and cellular automata approach.The soil erosion between isochrones was subsequently routed using the Hadley,WaTEM/SEDEM,and newly modified U.S.Forest Service methods.The last method was developed based on seven stan-dardized variables for the current research.Synthetic SGs were ultimately derived from 12 different combinations of the study methods.The modeling performance was assessed using 38 storm events collected over several years.The base time,time to peak,peak value,and total sediment load of the simulated and observed SGs were evaluated using relative error.Comparison based on the evaluation indicators indicated better performance of the combination of the spatially distributed travel time method,cellular automata,and modified U.S.Forest Service method with the coefficient of efficiency and the normalized coefficient of efficiency varying from-1.16 to 0.99 and from 0.32 to 0.99 for the calibration and validation stages,respectively.However,none of the models were simulating satis-factorily the entire sediment graphs.

Hydrological behaviorSediment modelingSediment routingSediment yield dynamicSoil erosion management

Azadeh Katebikord、Seyed Hamidreza Sadeghi、Vijay P.Singh

展开 >

Department of Watershed Management Engineering,Faculty of Natural Resources,Tarbiat Modares University,Noor 46417-76489,Iran

Department of Biological and Agricultural Engineering and Zachry Department of Civil Engineering,Texas A&M University,College Station,TX 77843-2117,USA

Agrohydrology Research Group of Tarbiat Modares University,IranMinistry of Energy,Iran Water Resources Management Company

IG-397131401/002/S

2024

10.1016/j.ijsrc.2023.11.002

国际泥沙研究(英文版)
国际泥沙研究培训中心

国际泥沙研究(英文版)

影响因子：0.337
ISSN：1001-6279
年,卷(期)：2024.39(1)