Abstract
Abstract. Two-dimensional hydrodynamic STREAM_2D model have been applied to the confluence of Amur and Zeya rivers. Main flow characteristics and possible channel changes are considered during modeling for two scenarios – without dams near Big Heihe Island (1) and with four dams in the side channels around the island (2). Results of modeling demonstrate impact of dams construction on flow concentrating in the main channel, which can lead to increasing of flow velocities and subsequent erosion in main Amur River channel downstream the river confluence.
Highlights
The confluence of the Amur and Zeya rivers is densely populated area
The Zeya River above the confluence as well as Amur River below the confluence is characterized by the wide floodplains with free conditions of the channel evolution
Results of estimations of water discharges redistributions has showed, that due to the dams construction in the side channels, flow will be concentrated in the main channel of the Amur River under discharges 1500–5500 m3 s−1, flow in the main channel will be increased up to 15 %–20 %
Summary
There are two main cities – Russian city Blagoveshchensk with 200 000 residences on left bank of the river Amur and Chinese city Heihe with population over 1.5 billion residences on the right bank of the river This territory is characterized by significant water problems related to floods and intensive channel processes. The further investigations of channel processes using two-dimensional hydrodynamic model were done based on novel bathymetric and floodplain topography datasets and accounts dam allocation along channels around island Big Heihe (Krylenko et al, 2018). Both mentioned studies are identified, that embankment of Blagoveshchensk is affected on the flow only locally in the section of the Amur River above the confluence. These constructions are look like ground cofferdams without any concrete reinforcements, the height of the dam’s crest is the same, as the height of nearby floodplains (about 124.5 m a.s.l.), which means, that during high flow periods dams can be overflowed
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