基于非静压方程的斜坡堤越浪数值模拟研究

发布时间：2018-05-05 20:47

本文选题：斜坡堤 + 越浪　；参考：《天津大学》2014年硕士论文

【摘要】：在海岸防护工程中,斜坡堤是最常见的建筑物之一,越浪是波浪与斜坡堤作用的一种主要现象,常常会造成斜坡堤及堤后建筑物的破坏,还会对港内泊稳产生影响。越浪往往会受到多种因素的影响,准确估计斜坡堤越浪量具有重要的工程意义。本文通过数值模型研究了斜坡堤越浪,主要研究内容和结论如下:(1)基于非静压波浪模型SWASH模拟斜坡堤的越浪,并将模拟结果分别与小尺度、大尺度水槽实验以及港池平面越浪实验的研究成果进行比较,模拟结果与实验结果吻合较好,验证了模型模拟规则波和不规则波在斜坡堤上越浪的正确性。(2)通过改变斜坡堤坡度的大小,讨论了坡度系数对平均越浪量的影响。分别对规则波和不规则波入射情况下斜波堤越浪与坡度系数的关系进行了分析,总体上平均越浪量随坡度系数的增大均有先增大后减小的趋势。不规则波入射时,当斜坡上的波浪为非破碎波且坡度系数大于2时,平均越浪量基本不受坡度系数的影响,不规则波作用下的越浪计算结果与修正的EurOtop公式吻合较好。(3)建立了斜坡堤坡面摩阻系数与糙渗系数的关系,模拟斜坡堤堤面上铺设不同护面块体情况下的越浪,并与越浪量规范公式和物理模型试验结果进行了比较,结果吻合较好。(4)结合实际工程,模拟平面呈折线式的斜坡堤越浪,计算结果表明沿堤顶的平均越浪量分布合理,进一步验证了建立的非静压模型可适用于模拟大范围的波浪变形及斜坡堤越浪。
[Abstract]:In coastal protection engineering, slope embankment is one of the most common buildings. Wave surpassing is one of the main phenomena of wave and slope embankment, which often results in the destruction of the slope embankment and the buildings behind it, and also affects the stability of the berth in the harbour. Wave surpassing is often affected by many factors, and it is of great engineering significance to estimate the overrun of slope embankment accurately. In this paper, a numerical model is used to study the overtopping of a slope embankment. The main contents and conclusions are as follows: (1) based on the non-hydrostatic wave model, SWASH is used to simulate the overtopping of the slope embankment, and the simulation results are compared with those of the small scale. The results of the large-scale flume experiment and the port pool plane surpassing experiment are compared, and the simulation results are in good agreement with the experimental results. It is verified that the model simulates the correctness of the regular and irregular waves over the slope levees. The influence of slope coefficient on the average surpassing is discussed by changing the slope gradient of the slope embankment. The relationship between the slope coefficient and the overtopping wave of the oblique breakwater under regular and irregular wave incidence is analyzed respectively. As a whole, the average surpassing wave volume increases first and then decreases with the increase of the slope coefficient. When the wave on the slope is a non-broken wave and the slope coefficient is greater than 2, the average surpassing wave is not affected by the slope coefficient. The calculated results of surpassing waves under the action of irregular waves are in good agreement with the modified EurOtop formula.) the relationship between the friction coefficient and the roughness coefficient of the slope embankment surface is established, and the surpassing waves on the slope embankment surface with different surface blocks are simulated. Compared with the standard formula of surpassing quantity and the result of physical model test, the results are in good agreement with the actual engineering, and simulate the slope levee with a plane of broken line. The calculation results show that the distribution of the average surpassing quantity along the top of the embankment is reasonable. It is further verified that the non-static pressure model can be used to simulate wave deformation and wave surpassing of slope embankment.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U656.2;TV139.25

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