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

强烈的风暴波可以引起不同程度的倾斜海底的下坡质量运动，包括大规模的破坏。永久位移，即使没有达到巨大的破坏，也可能大到足以对海底或海底中的结构造成破坏。因此，在近海和沿海开发中，对于密集的波浪载荷，必须评估永久位移的大小和发生大规模破坏的可能性，以避免灾难性后果。这项研究将开发一种实用而又合理的分析方法，以系统地评估微倾斜海底的波浪荷载。基于位移的方法将被采用，因为它可以在失效评估中考虑波浪环境的各种复杂性，同时可以提供永久位移的大小。评估方法将通过波浪水池模型试验、案例研究和分析研究来开发，并将编码到计算机程序中。

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.