刚性植物对聚焦波爬坡影响的数值模拟

Numerical Simulation on Influences of Rigid Vegetation Patch on Runup of Focused Wave Groups

基于开源程序非静压模型NHWAVE(Non-Hydrostatic Water Wave Model),建立了高精度二维数值波浪水槽,系统研究了非淹没刚性植物对聚焦波爬坡的影响规律,并分析了有效波高、植物区密度和长度等因素对局部最大波高衰减系数、总波能耗散系数和最大波浪爬高的影响。研究结果表明:当聚焦波向岸传播时,局部最大波高衰减系数和总波能耗散系数均随有效波高、植物区密度和植物区长度的增大而增大。聚焦波的最大爬高随有效波高的增大而增大,随植物区密度和植物区长度的增大而减小。随着植物区密度和长度的增大,波峰聚焦的聚焦波相比波谷聚焦的聚焦波有着更大的最大波浪爬高。结果可为进一步认识沿岸防浪林对聚焦波浪的衰减效应和沿海地区的防灾减灾建设提供参考依据。

By using a high-precision 2D numerical wave tank established based on the open source solver non-hydrostatic wave model NHWAVE,the law of the influence of emergent rigid vegetation patch on run-up process of focused waves is systematically studied and the affections of the factors such as effective wave height,peak wave period and the rigid vegetation density and length on attenuation coefficient of local maximum wave height,dissipation coefficient of total wave energy and run-up height of maximum waves are also analyzed.The results show that when the focused waves spread towards the shore,the attenuation coefficient of local maximum wave height and the dissipation coefficient of total wave energy are both increased with the effective wave height and the rigid vegetation density and length,but decreased with the increase of the peak wave period.The maximum run-up height of the focused waves is increased with the effective wave height and the peak wave period,but decreased with the increase of the rigid vegetation density and length.With the increasing of the rigid vegetation density and length,the crest-focused waves have a larger maximum run-up height than the trough-focused waves.These results can provide references for further understanding of the attenuation effect of coastal wave prevention forest on focused waves and the constructions of disaster prevention and mitigation in the coastal areas.