Unified Evaluation Method for Wave-Induced Massive Movement of Slightly Sloping Seafloor

强烈的风暴波可以引起倾斜的海底不同程度的下坡体运动，包括大规模的破坏。永久的位移，即使没有达到大规模的破坏，也足以破坏海底或海底的结构。因此，在近海和沿海开发中，为了避免灾难性后果，必须对强波浪荷载下永久位移的大小和大规模破坏的可能性进行评估。本研究将建立一套实用而又合理的分析方法，以系统地评估轻微倾斜海床的波浪荷载。将采用基于位移的方法，因为它可以在失效评估中考虑各种复杂的波动环境，同时可以提供永久位移的大小。评估方法将通过波浪槽模型试验、案例历史研究和分析研究来制定，并将在计算机程序中编码。

Severe storm waves can cause downslope mass movements of a sloping seafloor in various magnitudes including massive failure. Permanent displacements, even not reaching a massive failure, can be large enough to be destructive to structures on or in the seafloor. Therefore, in offshore and coastal development, both the magnitude of permanent displacements and possibility of a massive failure must be evaluated for intensive wave loading in order to avoid catastrophic consequences. This research will develop a practical and yet rational analysis-based method to evaluate wave loading in a systematic manner for slightly sloping seafloors. The displacement-based approach will be adopted since it can account for various complexities of wave-induced environments in a failure evaluation and, at the same time, can provide the magnitude of the permanent displacements. The evaluation method will be developed through wave tank model tests, case history studies and analytical studies, and will be coded in a computer program.