摘要
本文在分析岸滩冲刷演变规律的基础上,提出了一种较合理的岸滩演变数值计算改进模式。其中号虑了岸滩的等深线不问,其侵蚀后退的速率也不相同,在侵蚀过程中,岸滩坡度越来越级。文中针对毛里塔尼亚友谊港突堤下游海岸,结合实物模型试验结果,建立了岸滩冲刷演变规律的函数关系式。文中还考虑了波浪折射、绕射的综合影响,以及沿岸波高不等引起的沿岸输沙率变化。最后,本文对友谊港突堤下游海岸,进行了自然冲刷的数值计算。结果表明,其岸线形态、水下地形比以往的数值模型更加切合实际,并与实物模型试验结果进行了相互验证。
Based on analysing the law of beach erosion evaluation, an improved numerical model for beach evaluation is obtained. In this model, the authors consider that at different water depths, erosion rate is different, and when the erosion progresses, the beach slope becomes gentler and gentler. According to the evaluation of Mauritania beach and the results of model testing, a function relation of the law has been built. In this paper, the combined effect of wave refraction and diffraction, and the variation of longshore wave breaker height are considered. At last, the natural beach erosion in the downdrift of the jetty of the Friendship Harbour is calculated. The results indicate the form of coastline, and the under water morphology are more coincident with practice than before. Moreover, the numerical results are coincident very well with model testing results.
