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植物的消波特性能有效防止波浪冲刷所造成的岸线侵蚀。在开展根茎叶共同作用下的刚性植物消波实验的基础上,采用Kobayashi和Dalrymple经验公式计算本实验植物模型的拖曳力系数,探究了拖曳力系数变化规律。通过对比分析两种经验公式计算所得的拖曳力系数,发现采用Kobayashi消波模型对于本实验中刚性植物消波模拟效果更好。根茎叶均在不同程度上对于植物消波特性产生影响。拖曳力系数与邱卡数、雷诺数、厄塞尔数及相对水深之间的关系依赖于植物淹没度。针对包含根茎叶的刚性植物,考虑植物摆动因素,对波能耗散方程中阻力项进行修正,提出改进的消波模型。
The wave elimination characteristics of plants can effectively prevent the shoreline erosion caused by wave erosion. Based on the rigid plant wave experiment under the joint action of rhizome and leaf, the drag coefficient of the plant model was calculated by Kobayashi and Dalrymple empirical formula, and the change law of drag coefficient was explored. By comparing and analyzing the drag coefficient calculated by two empirical formulas, it is found that the Kobayashi wave elimination model is more effective for the simulation of the rigid plant wave elimination in this experiment. Roots and leaves are to varying degrees, the plant wave characteristics have an impact. The relationship between drag coefficient and Qiu number, Reynolds number, the number of Urselle and the relative water depth depend on the submergence of plants. For rigid plants containing rhizomes and leaves, considering the factor of plant swing, the resistance term in wave energy dissipation equation is modified, and the improved wave elimination model is proposed.