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

IF 3.5 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
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Abstract

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.

超级洪水期间的沉积物迁移动力学:印度河古杜拦河坝 2010 年特大洪水案例研究
印度河的年泥沙输送量从每天 0.725 亿吨到 1.0 亿吨不等,从每年 2.6 亿吨到 3 亿吨不等。内线结构(古杜拦河坝)上游的泥沙淤积量经常增加。因此,泥沙淤积降低了古杜拦河坝的进水渠供水量、设计取水量和泄洪能力。此外,印度河的行为、河道尺寸、模式和洪水频率在时间和空间形态上都发生了变化,河道呈辫状高低蜿蜒。在本次研究中,水文工程中心的河流分析系统 (HEC-RAS) 模型与 ArcGIS 结合使用,用于研究泥沙动态、分析洪水剖面/水面高程以及评估泥沙的侵蚀和沉积。此外,还采用准稳流分析方法模拟了 2010 年 7 月至 9 月期间的泥沙输运情况。结果发现,沉积物运移导致的最大增高为 6.40 英尺(1.950 米),最大退化为 30 英尺(9.144 米),并随模型的水力条件而进一步变化。累积海床变化中,泥沙运移加剧量为 1050 万吨(9070 万吨),退化量为 55 万吨(50 万吨)。此外,还发现了累积纵向质量变化,沉积物运移加剧为 1.55 亿吨(1.4062 亿吨),退化为 10 万吨(9 万吨)。累计质量流入量为 3.2 亿吨(2.903 亿吨)。而模型显示,水工建筑物上游和下游的洪水位分别为 264 英尺(80.467 米)和 260.29 英尺(79.34 米)。因此,HEC-RAS 模型准确地反映了在闸堰(一种内嵌式结构)处观测到的泥沙输运和水位。
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来源期刊
International Journal of Sediment Research
International Journal of Sediment Research 环境科学-环境科学
CiteScore
6.90
自引率
5.60%
发文量
88
审稿时长
74 days
期刊介绍: International Journal of Sediment Research, the Official Journal of The International Research and Training Center on Erosion and Sedimentation and The World Association for Sedimentation and Erosion Research, publishes scientific and technical papers on all aspects of erosion and sedimentation interpreted in its widest sense. The subject matter is to include not only the mechanics of sediment transport and fluvial processes, but also what is related to geography, geomorphology, soil erosion, watershed management, sedimentology, environmental and ecological impacts of sedimentation, social and economical effects of sedimentation and its assessment, etc. Special attention is paid to engineering problems related to sedimentation and erosion.
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