River-Bed Down-Cutting Equilibrium of a Reach on Yangtze River

Document identifier: oai:DiVA.org:ltu-76405
Access full text here:10.3850/38WC092019-0266
Keyword: Engineering and Technology, Mechanical Engineering, Fluid Mechanics and Acoustics, Teknik och teknologier, Maskinteknik, Strömningsmekanik och akustik, Yangtze River, Jingjiang reach, Geomorphic adjustments, River morphology, Extremal hypothesis, Strömningslära, Fluid Mechanics
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructureSDG 6 Clean water and sanitation
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

The Three Gorges Project (TGP) introduces significant flow and sediment variations after its impoundment, due to which remarkable geomorphic adjustments prevail in the Jingjiang reach of the middle Yangtze River. The present study deals with the hydro-morphological equilibrium, considering both the dam operation and large-scale bank protection works along the reach. Based on available data, the equilibrium is, by means of a regime-based approach of maximum flow efficiency, analysed for the reach. The study shows that the flow discharge of the reach has not changed considerably after the TGP impoundment in 2003. After the impoundment, the suspended load into the reach descends drastically and but comes to a relatively stable level after 2006. The reach had not come at a hydro-morphological equilibrium before 2012; there is seemingly a tendency to reach a new equilibrium with time. The maximum flow efficiency method is useful to explore equilibrium conditions of a large river if flow and sediment conditions are modified.

Authors

Qiancheng Xie

Luleå tekniska universitet; Strömningslära och experimentell mekanik
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Ishwar Joshi

Hydro Lab, 21093 Lalitpur, Nepal
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James Yang

Concrete Structures, Royal Institute of Technology, 10044 Stockholm, Sweden.Vattenfall AB, R&D Hydraulic Laboratory, 81426 Älvkarleby, Sweden
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