弯曲河道凹岸处由于水流的集中,水位上升,河床的局部冲刷变大(图1)。根据阿部等人的研究,凹岸水位上升及局部冲刷的程度因河道地形及流量而不同,曲率半径(R)与河道宽度(B)的比(R/B)越小,水位亦升高,局部冲刷亦变大。由于河床加固,水流得到调整,局部冲刚深就变小。 Due to the concentration of water currents at the concave bank of the curved river, the water level rises and the local erosion of the riverbed becomes larger (Fig. 1). According to the research by Abe et al., The level of concave water level rise and local erosion vary with the river topography and flow rate, and the smaller the ratio of the radius of curvature (R) to the river width (B) (R / B) Local erosion is also larger. As the riverbed is reinforced, the water flow is adjusted and the local rush depth becomes smaller.