【作者】 张庆民；

【导师】 邹志利；

【作者基本信息】 大连理工大学 ， 港口、海岸及近海工程， 2019， 硕士

【摘要】 海湾处于陆地与海洋之间的纽带部位,开发环境优越,具有重要的经济、战略价值,认识和了解海湾地貌演变规律以及海湾内水动力因素对海湾的利用保护具有重要意义。本文利用数值计算模型,包括水动力模型、泥沙输运模型和地形演变模型,对不同长度海湾的地形平衡剖面形态进行研究。本文首先介绍了计算模型以及相应的差分方法和计算流程。为保证计算模型的正确性,在不同长度海湾内潮波空间特征的分析中验证了水动力模块,并研究有摩擦和无摩擦情况下的潮波特征。为研究不同坡度初始地形对海湾平衡剖面的影响,利用数值模型模拟了不同坡度初始地形的矩形、收缩型和扩张型短海湾的水底剖面。通过水底平衡剖面与短海湾理论平衡剖面对比,验证了地形演变模块;通过水底平衡时的泥沙浓度与短海湾平衡剖面的理论浓度对比,验证了泥沙输移模型;通过对比不同坡度初始地形的海湾平衡剖面,分析了海湾初始地形坡度对海湾水底平衡剖面的影响,结果表明,不同坡度初始地形对应的海湾水底平衡剖面并不相同,但是剖面类型(斜坡型、下凹型和上凸型)保持不变。为研究长海湾水底平衡剖面的形态,利用数值模型模拟了矩形、收缩型和扩张型长海湾的水底平衡剖面。与短海湾水底平衡剖面形态相比,分析了长海湾水底平衡剖面形态的变化。在此基础上,进一步讨论了不同输沙方式对海湾水底平衡剖面的影响。更多还原

【Abstract】 The Embayment is located in the link between land and sea,and its development environment is superior.It has important economic and strategic value.It is important to know and understand the evolution law of the Embayment landform and the hydrodynamic factors in the embayment for the utilization and protection of the embayment.In this paper,numerical models,including hydrodynamic model,sediment transport model and topographic evolution model,are used to study the topographic equilibrium profiles of embayments with different lengths.Firstly,this paper introduces the computational model,the corresponding difference method and the computational process.In order to ensure the correctness of the calculation model,this paper validates the hydrodynamic module in the analysis of spatial characteristics of tidal waves in embayments of different lengths,and studies the characteristics of tidal waves under frictional and non-frictional conditions.In order to study the influence of initial topography on the equilibrium profile of the embayment,numerical models were used to simulate the bottom profiles of rectangular,convergent and divergent short embayments with different initial topography.The terrain evolution module is validated by comparing the bottom equilibrium profile with the short embayment theoretical equilibrium profile;the sediment transport model is validated by comparing the suspended sediment concentration in the bottom equilibrium profile with the theoretical concentration in the short embayment equilibrium profile;and the influence of the initial topographic slope on the bottom equilibrium profile of the embayment is analyzed by comparing the embayment equilibrium profiles with the initial topographic slope of different slopes.It is clear that the embayment bottom equilibrium profiles corresponding to the initial topography of different slopes are different,but the profile types(slope,concave and convex)remain unchanged.In order to study the shape of the bottom equilibrium profile in long embayment,the bottom equilibrium profiles of rectangular,convergent and divergent long embayments were simulated by numerical model.Compared with the shape of the short embayment bottom balance profile,the change of the shape of the long embayment bottom balance profile was analyzed.On this basis,the influence of different sediment transport modes on the balance profile of the embayment bottom is further discussed.更多还原