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Nov 4, 2023 · In the context of global climate change, the frequency of watershed flooding events resulting from extreme rainfall has significantly increased. Especially at river or lake confluences, the presence of backwater effects greatly amplifies the flood risk. To investigate the influence of backwater effects on the hydraulic characteristics of rivers and lakes, this study focuses on the Dongping ...
Nov 3, 2022 · Backwater zones are regions at the river downstream sections, a fluvial–marine transition area between upstream flow and estuary or coastal river plume, where the river flow is affected by the coastal processes, such as sea level changes, tides and storm surge (Lamb et al., 2012), and can extend hundreds of kilometers upstream in low-lying watersheds (e.g., up to 500 km in the Mississippi ...
Sep 1, 2024 · Backwater is a commonly observed hydrological phenomenon at confluences, not only in tributaries of lakes and reservoirs but also in plain rivers (Li et al., 2018).The backwater effect always occurs in tributaries, where the backflow from the mainstream causes a rise in water level, a decrease in flow speed, and a change in flow direction.
Feb 4, 2022 · Backwater effects in river sections are often caused at obstacles like weirs, (tide) gates, and retention or detention reservoirs, which also function as control structures in streams. It is required to model these structures in hydrological models since such control structures are regularly used to control the flow in catchments.
Each selected event is identified by the dominant flood drivers. In Section 2, we provide an overview of the study domain, the river model, the unstructured mesh, and the methods of extreme event selection and drivers decomposition. Model evaluation and analyses are provided in Sections 3, 4 and 5.
May 15, 2019 · This section of the river is typically referred to as the backwater zone, ... Although hydrodynamic backwater effects can cause erosion in the backwater zone (e.g., ...
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What causes backwater effects in river sections?
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downstream water level corresponding to the MSL (at 5 m elevation) causes significant backwater effect on the downstream-most river reaches. For a higher discharge rate of 115 m3/s, a similar trend is observed (not shown). In both cases, the backwater effects are significant up to approximately 15 km
