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Effect of complicated river boundaries on the cycle of landslide surge
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摘要: 滑坡涌浪对涌浪生成和传播区域可能造成巨大影响。河道型水库滑坡涌浪受河道边界的作用会产生波浪叠加。为研究河道边界对滑坡涌浪周期的影响规律，借助长江三峡库区万州某河段与原型一致的物理模型，基于FLOW-3D计算流体力学软件建立三维滑坡涌浪数值模型，给出了数值求解、网格划分和边界条件设置方法，并经物理模型试验对建立的三维数学模型进行一致性较好的验证。按照滑坡体入水点位于河道直线段、弯道凸岸顶点、弯道凹岸顶点3种工况，模拟分析复杂河道边界对滑坡涌浪周期的影响规律，绘制波谱强度与频率关系图，得出不同岸坡坡度、弯道凹岸平面曲率、凹岸圆弧角度、凸岸圆弧角度对涌浪周期的影响规律。Abstract: Landslide surge can cause huge damage to the area of surge generation and propagation. The effect of the river boundary on the landslide surge in a river-type reservoir will result in wave superposition. In order to study the effect of river boundary on the surge period of landslide, a 3-d numerical model of landslide surge is established based on the FLOW-3D computational fluid dynamics software, using a physical model which is identical to the prototype of a river section in Wanzhou in Three Gorges Reservoir area. The methods of numerical solution, mesh generation and boundary condition setting are given, and the consistency of the three-dimensional mathematical model is verified by physical model test results. According to the three working conditions that the water entry point of the landslide body is located in the straight section of the river channel, at the crest of the convex bank and at the crest of the concave bank of the curved channel, the relation graphs of spectrum intensity and frequency are drawn. The influence law of the complicated river boundary on the surge period of the landslide is analyzed, and the effects of different bank slopes, curvature of curved concave bank, arc angle of concave bank and arc angle of convex bank on swell period are obtained.
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Key words:
- landslide surge /
- complicated river boundary /
- back wave cycle /
- numerical model /
- FLOW-3D
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图 1 滑坡涌浪数值模拟三维模型及网格划分
Figure 1. 3D model and mesh of landslide surge numerical simulation
图 2 凸岸滑坡涌浪测点平面布置（单位：m）
Figure 2. Layout plan of swell measuring points of convex landslide (unit: m)
图 4 不同岸坡坡度作用下A1及A2测点频谱
Figure 4. Spectra of point A1 and point A2 under the action of different bank slope angles
图 5 不同凹岸平面曲率作用下B1及B2测点频谱
Figure 5. Spectra of point B1 and point B2 under the action of plane curvature of different concave banks
图 6 不同凹岸圆弧角度作用下B1及B2测点频谱
Figure 6. Spectra of point B1 and point B2 under action of different concave bank arc angles
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