沟槽地形对岛礁波浪及波生流演变特性影响的数值模拟研究

Numerical simulation on the influence of spur and groove systems on wave drived currents and wave evolution characteristics of reef

中文关键词:  NHWAVE  沟槽系统  规则波  波生流  数值模拟

英文关键词:NHWAVE  spur and groove system  regular waves  wave-driven currents  numerical simulation

中文摘要:

      沟槽系统（SpurandGrooveSystem）是一种典型的礁前斜坡 地貌，由间隔规则、分布平行的长条状沙脊（Spur）和槽谷（Groove） 组成。在沟槽系统形成、发展和维持的过程中，存在相对稳定的水动 力环境，为研究其水动力特性提供了必要条件。本文基于非静压模型 NHWAVE建立三维数值波浪水槽，并结合沟槽系统模型，对规则波 在沟槽系统岸礁上波生流及波浪演变特性进行数值模拟研究。同时研 究了不同波浪要素（入射波高、波浪周期）及水深影响，系统分析了 平均流场、环流强度以及消能率在沟槽系统岸礁上的变化规律。研究 结果表明：沟槽系统显著改变了波浪流场的分布，且与波浪共同作 用，形成了拉格朗日环流，进一步增强了波浪的能量耗散，进而有效 减弱了波浪对沿岸地区的侵蚀，保护了沿岸地貌的稳定性。

英文摘要:

      The Spur and Groove System is a typical fore-reef slope landform composed of regularly spaced, parallel elongated sand ridges and grooves. During the formation, development, and maintenance of the spur and groove system, a relatively stable hydrodynamic environment exists, making it necessary to conduct research on hydrodynamic characteristics. This paper establishes a three-dimensional numerical wave flume based on the non-hydrostatic model NHWAVE and, combined with a spur and groove system model, conducts numerical simulations of wave-induced currents and wave evolution characteristics on the spur and groove system reef. It systematically analyzes the effects of different wave elements (incident wave height, wave period, and water depth) on the average flow field, circulation intensity, and energy dissipation rate. The results show that the presence of the spur and groove system alters the distribution of the wave flow field, generates Lagrangian circulation in conjunction with the waves, and dissipates more wave energy, thereby better protecting the integrity of the coastal areas.