Scoured depth and length of pools and ditches generated by overtopping flow from embankments during the 2011 Great East Japan Tsunami
Scoured depth and length of pools and ditches generated by overtopping flow from embankments during the 2011 Great East Japan Tsunami
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DOI：
10.1016/j.oceaneng.2015.08.053
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发表时间：
2015-11
影响因子：
5
通讯作者：
N. Tanaka;Masayuki Sato
中科院分区：
文献类型：
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作者：
N. Tanaka;Masayuki Sato
对2011年东日本大海啸产生的泥石流后面的冲刷区域的特征进行了调查，沿着沿着发生了严重侵蚀的Abuyagawa河和其他四个地点。为了定量估计海啸破坏与水力参数之间的关系，采用非线性长波方程和断层运动模型对海啸进行了模拟。最大能水头和最大动量表示最大冲刷深度和最大冲刷长度，但溢流方式对冲刷特性也有很大影响。即使在河口的远侧，冲刷深度和长度也很大，因为海啸在河流中的传播速度更快，并且受河流当地条件的影响，曲流河道和桥梁筑坝。通过这种实际规模的研究获得的关系，可用于估计最大冲刷深度和长度后面的堤坝，设计基础的堤坝，并估计海啸的程度在海啸后的调查。
The characteristics of scoured regions behind embankments generated by the 2011 Great East Japan tsunami were investigated along the Abukumagawa River, where severe erosion by overtopping of river embankments had occurred, and four other locations. To quantitatively estimate the relationship between the damage and hydraulic parameters, the tsunami was simulated by non-linear long wave equations and a fault motion model. The maximum energy head and momentum express the maximum scoured depth and length, but the overflow type, free or submerged, also greatly affects the scour characteristics. Even on the far side of the river mouth, the scoured depth and length were large because propagation of the tsunami in the river was faster and overflow occurred as a free type affected by the local conditions of the river, i.e., a meandering course and damming by the bridge girder. The relationship obtained by this real-scale study can be utilized to estimate the maximum scour depth and length behind the embankment, to design footings for embankments, and to estimate the extent of the tsunami in post-tsunami surveys.