论文部分内容阅读
通过物理模型实验研究了海岸沙坝剖面和滩肩剖面的形成和演化过程,给出了稳定的沙坝剖面和滩肩剖面的几何特征。实验中考虑了两种初始坡度(1∶20和1∶10)和不同波高的规则波和不规则波,讨论了不同初始坡度海岸上破碎波空间分布特征。结果表明,沙坝产生后存在向岸和离岸两种运动形态,但最终将停留在稳定位置。稳定的沙坝剖面对应不同初始坡度和波浪存在不同的大沙坝和小沙坝分布。沙坝剖面由长时间小波高波浪序列作用后可转化为稳定滩肩剖面,该剖面不依赖于波浪和初始坡度。实验也给出了平衡剖面与理论曲线的对比以及剖面上泥沙粒径的分布。
Through the physical model experiment, the formation and evolution of the coastal sand dam section and beach shoulder section are studied, and the geometric characteristics of the stable sand section and beach shoulder section are given. In the experiment, two kinds of regular and irregular waves with initial slope (1:20 and 1:10) and different wave heights are considered. The spatial distribution characteristics of the broken waves on the coast with different initial slopes are discussed. The results show that there are two kinds of movement forms of shore and offshore after the occurrence of sand dam, but will eventually stay in a stable position. The stable sabot profile corresponds to the distribution of large sands and small sands with different initial inclines and waves. Shaba profile can be transformed into a stable shoal shoulder profile by long-wave high-wave sequence, which does not depend on wave and initial slope. The experiment also gives a comparison between the equilibrium section and the theoretical curve and the distribution of sediment particle size in the section.