强冲刷侵蚀岸段水深地形变化成因分析

Research on the Topography in Eroded Seashore

海底地形变化是海洋动力变化的直接表征之一,强冲刷侵蚀岸段水深地形变化,主要是由于风暴潮等恶劣天气而形成的波浪扰动起海底表层物质成分,并由海流和风完成了对悬沙的运移所致。风暴潮引起海浪在海岸浅水处破碎,卷破波的水舌向下冲击时,在海底形成很大的旋涡,把泥沙掀动起来,在风流潮和的作用下,致使侵蚀冲刷快速的呈现,造成了水深地形的变化。一般情况下,水深地形变化较大地段由于泥沙的自然盈亏影响较小,人为的因素改变了自然平衡发生变化是重要因素。而冲刷侵蚀岸段的水深地形变化与海洋动力紧密相关,因此,研究分析海洋动力与水深地形变化的成因,对海岸工程及其防护至关重要。

Sea floor erosion is mainly caused by the storm tide or other bad weathers. Waves caused by these bad weather conditions can stir the superficial matters of the sea floor, and the soil particles will be transported away by ocean current and wind. The storm tide-induced waves break in the coastal areas and big whirlpools form, stirring the sediments. Under the function of the tide and wind, corrosion and erosion are caused and the topography changes. Generally speaking, the areas where the water depth changes acutely are not so much influenced by the natural transportation of sediments as influenced by artificial factors. It is very important to research the ocean dynamic and the change of the topography when it comes to be a serious problem to the sea embankment protecting.