Modeling of landslide generated impulsive waves considering complex topography in reservoir area
Modeling of landslide generated impulsive waves considering complex topography in reservoir area
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DOI：
10.1007/s12665-016-5252-y
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发表时间：
2016-02
影响因子：
2.8
通讯作者：
Wei Wang;Guang-qi Chen;K. Yin;Yangshuang Wang;Suhua Zhou;Yiliang Liu
中科院分区：
文献类型：
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作者：
Wei Wang;Guang-qi Chen;K. Yin;Yangshuang Wang;Suhua Zhou;Yiliang Liu
冲击波是库区滑坡引起的最显著的次生灾害之一。具有较大波幅的冲激波会对坝体、岸线财产和生命造成严重破坏。为了研究和预测波浪特性，许多实验研究采用了广义通道而不是实际地形。在复杂地形下，由于波的折射或反射，与理想几何形状的偏差可能导致不可忽略的影响。为了考虑地形效应，进行了原型比例实验。进行了不同参数配置下的一系列试验。总结了实验结果，提出了预测最大波幅和波在通道方向上衰减的经验方程。与理想模型相比，广义经验方程对波浪特征的预测效果更好。基于SPH方法进行了与物理实验相对应的三维数值模拟。详细研究了滑坡体和通道方向上的波浪特性，包括最大波幅、波浪上升、波浪到达时间和波峰振幅衰减。模拟结果与实验结果的对比表明，SPH模拟结果在复杂地形条件下确定河流一般特征方面具有良好的准确性。最后，讨论了实验方法和数值方法在分析实际工程问题中的局限性和适用性。两种方法的结合有利于库区滑坡冲击波灾害的预防和减少。
The impulsive wave is considered as one of the most notably secondary hazards induced by landslides in reservoir areas. The impulsive wave with considerable wave amplitude is able to cause serious damage to the dam body, shoreline properties and lives. To investigate and predict the wave characteristics, many experimental studies employed the generalized channels rather than the realistic topography. Deviation from the idealized geometries may result in non-negligible effects due to the wave refraction or reflection with complex topography. To consider the topography effect, a prototype scaled experiment was conducted. A series of tests with different collocation of parameters were performed. The experimental results were then summarized to propose empirical equations to predict the maximum wave amplitude, and wave decay in channel direction. The generalized empirical equations can obtain better results for wave features prediction by compared with those derived from the idealized models. Furthermore, a 3D numerical modeling corresponding to the physical experiment was conducted based on the SPH method. The wave characteristics in the sliding and channel directions were investigated in detail including the maximum wave amplitude, wave run-up, wave arrival time and wave crest amplitude decay. The comparison between the simulation and experiment indicates the promising accuracy of the SPH simulation in determining the general features even with complex river topography. Finally, the limitation and applicability of both the experimental and numerical methods in analyzing the practical engineering problems were discussed. Combination of the both methods can benefit the hazard prevention and reduction for landslide generated impulsive waves in reservoir area.