中文摘要：

基于波浪水槽动床实验,开展海啸波作用下直立堤局部冲刷实验研究。对海啸波上爬和回落过程、岸滩演变和直立堤局部冲刷形态进行测量。在利用实测数据验证基础上,结合FLOW3D进行数值模拟流场计算分析。研究结果表明,直立堤的修建对岸滩起到明显的保护作用,但是直立堤两侧会出现明显的局部冲刷。直立堤向岸侧局部冲刷主要发生在海啸上爬时刻,堤脚处形成的涡流是局部冲刷形成的主要原因。直立堤离岸侧的局部冲刷主要由海啸波回落水流越过堤顶生成水跌形成的,随着直立堤堤顶高度的增加,最大局部冲刷深度会逐渐减小。

英文摘要：

A set of 2D laboratory experiments was designed for alluvial bed to investigate local scour around vertical breakwater by tsunami waves. Processes of wave uprush and back wash, change of cross-shore beach profile and scour were measured and recorded. The FLOW3D software was validated through available laboratory experiments to numerically simulate the flow field. The results showed that the beach was significantly protected by vertical breakwater. Meanwhile, local scour was appeared around vertical breakwater. The uprush wave that accompanied the vortex near the toe had a scouring effect on onshore beach around vertical breakwater. The hydraulic drop that generated back wash wave through the breakwater had a scouring effect on offshore beach around vertical breakwater. The maximum local scour depth could decrease, with increase of vertical breakwater height.