When wave energy builds up, beach berm and even dunes are quickly eroded with this material being removed offshore to form a bar parallel to the beach. It proceeds seawards during the course of the storm to reach some ultimate location prior to being dismantled and moved back to the beach by subsequent swell. There is difficulty in defining the steepness associated with storm, although it has commonly been accepted that steeper waves often produce a bar or a barred beach bar position and its crest height for a given storm condition. Therefore, criteria for the formation of bar and berm profiles respectively, need to be clarified.. In this paper, the available experimental data of large wave tank (LWT) from U.S. Army Crops of Engineering and Japanese Central Research Institute of Electric Power Industry are used to construct a new relationship. Finally, criteria for bar and berm formation and seawalls design are found, and new criteria form are quite simple and widely applicable.
In order to achieve the purposes of environ mental protection, such as flood control, sustainable development on water utilizat ion and increasing of water demand with the decreasing of conservative water resources, to find new supplementary water resources and effective utilization those resource becomes a very significant topic. Rainwater, which is caught by reservoir at upstream while flowing down into sea through the middle or downstream, a best blessed gift and it has no water right problem without falling down the ground. Considering fro m the view point of environ mental, econo mic, and social impacts, the utilization on water harvesting and flood mit igation with the benefit-cost ratio analysis and the effective function of gutter snipe design keeping water clean evoke us to study in paying much attention. In this study, high B/C ratio and wide application are presented.
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