Sediment transport dynamics during a super flood:A case study of the 2010 super flood at the Guddu Barrage on the Indus River  

作　　者：Imran Aziz Tunio Love Kumar Sheeraz Ahmed Memon Ali Asghar Mahessar Abdul Wahid Kandhir 

机构地区：[1]Project Management Office,Sindh Barrages Improvement Project,Sindh Irrigation Department,Government of Sindh,Karachi 75460,Pakistan [2]West Florida Research&Education Center,Watershed Management Lab,Soil,Water,and Ecosystem Science Department,University of Florida,Florida 32603,USA [3]Institute of Environmental Engineering&Management(IEEM),Mehran University of Engineering&Technology,Jamshoro,Sindh 76062,Pakistan [4]Sindh Irrigation Department,Government of Sindh,Hyderabad 71500,Pakistan

出　　处：《International Journal of Sediment Research》2024年第5期683-701,共19页国际泥沙研究（英文版）

摘　　要：Annual sediment load transportation in the Indus River varies from 0.725 to 1.0 Mt/d and varies from 260 to 300 Mt/y.Sediment accumulation upstream of the inline structure(Guddu Barrage)has frequently increased.Consequently,the sediment accumulation reduces the intake canal supply,design withdrawals,and flood-carrying capacity of the Guddu Barrage.Furthermore,the Indus River changes its behavior,channel dimensions,pattern,and flooding frequency with respect to temporal and spatial morphology with braided high to low meanders.In the current study,the Hydrologic Engineering Center-River Analysis System(HEC-RAS)model,in combination with ArcGIS,were used to study sediment dynamics,analyze flood profile/water surface elevation,and assess erosion and deposition of sediment.In addition to this,a quasi-unsteady flow analysis method was used to simulate sediment transport from July to September 2010.It was found the invert change due to sediment transport maximum aggradation was 6.40 ft(1.950 m),and the maximum degradation was 30 ft(9.144 m),which further varies with the hydraulic conditions of the model.Cumulative mass bed change,sediment transport aggradation was 10.50 million tons(9.53 million t),and degradation was 3.7 million tons(3.3 million t).Moreover,it was found cumulative longitudinal mass change,sediment transport aggradation was 155 million tons(140.62 million t),and degradation was 10 million tons(9.07 million t).The cumulative mass inflow was 320 million tons(290.3 million t).Whereas the model revealed that the flood level upstream and downstream of the hydraulic structure was 264 ft(80.467 m)and 260.29 ft(79.34 m),respectively.Therefore,the HEC-RAS model accurately represents the sediment transport and water levels observed at a gated weir,which is an inline structure.

关 键 词：Sediment transport HEC-RAS model Hydraulic parameters Floods River morphology 

分 类 号：TV14[水利工程—水力学及河流动力学]