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为了研究不同河道形态岸坡的抗冲刷问题,采用轴比λ定义了不同河道形态岸坡:当λ=0时,岸坡坡面形状为平面形;当λ=1/5、1/4、1/3、1/2时,岸坡坡面形状为椭圆形;当λ=1时,岸坡坡面形状为圆形。利用数值软件分析了不同形状岸坡坡角α、坡高h与岸坡抗冲刷能力F之间的关系。结果表明:1对平面形岸坡形状:当h不变时,岸坡抗冲刷能力F随岸坡坡角α的增大而呈现递减变化;当坡角α不变时,抗冲刷能力F随坡高h的增大而呈现递减变化。2对凹形岸坡形状(椭圆形、圆形):当λ、h不变时,岸坡抗冲刷能力F随坡角α的增大而呈现递减变化;当α、h不变时,岸坡抗冲刷能力F随轴比λ的增大呈现先增大后减小的变化。此分析结果可为小浪底库区岸坡形状优化提供参考。
In order to study the anti-scouring problems of bank slopes in different river channels, the axial ratio λ is used to define different bank shape bank slopes. When λ = 0, the bank slope shape is planar. When λ = 1/5, 1/4, 1 / 3,1 / 2, the slope slope shape is oval; when λ = 1, slope shape is circular. The relation between slope angle α and slope height h of different shapes and anti-scour ability F of slope was analyzed by numerical software. The results show that: 1 For the flat shape of bank slope: When h is constant, the anti-scour ability F of bank slope decreases with the increase of slope angle α; when the slope angle α is constant, the anti-scour ability F The height of slope h increases with decreasing. 2 pairs of concave slope shape (oval, circular): When λ, h constant, the slope of the anti-scouring ability F with slope angle α shows a decreasing change; when α, h constant, the shore Slope anti-scour ability F with the axial ratio λ increases first and then decreases. The results of this analysis can provide references for the shape optimization of bank slope in Xiaolangdi Reservoir Area.