Low-Waterway and Bank Erosion in a River With Alternating Bars Bedby Chimataro Ishii, Akita Univ, Japan,
Tsutomu Kishi, Akita Univ, Japan,
Hiroshi Asada, Akita Univ, Japan,
Abstract: In a river with alternating bars bed, the banks are often subjected to erosion due to the convergent flow resulted from the bed geometry, even in a straight channel. It is known empirically that a bank erosion does not always occurs during a high water and it rather occurs during a low water, and its position along the river banks moves with the river discharge. In this study, flume experiments were carried out to investigate the bank erosion process in a river with alternating bars bed, especially during a low water. It was observed that there are two patterns in deformation of bars and construction of low-waterway, and that a deep scour hole was produced by a strong vortex at an incident point along the side wall of a meandering low-waterway.
Subject Headings: Erosion | River bank stabilization | Shoals | Water discharge | High-rise buildings | Flumes | Scour | Channel flow
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