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该文在实验室水槽中利用三维声学多普勒流速仪(ADV)和波高仪测定水流流速和波浪高度,以此数据研究了河道水生沉水植物对曼宁系数的影响。实验利用人造植物模拟自然植物,研究结果表明沉水植物对水流结构、阻力特性存在显著影响。在分析曼宁系数的变化规律之后提出了新的半经验方程,用以预测不同植物密度、不同波流条件下曼宁系数的变化。曼宁系数主要和植物密度和水流流速有关,同时受波浪的影响。新的方程对曼宁系数的拟合效果良好。
In this paper, three-dimensional Acoustic Doppler Velocimetry (ADV) and wave height meter were used to determine the flow velocity and wave height in a laboratory sink. Based on this data, the effect of aquatic macrophytes on Manning coefficient was studied. Experiments using artificial plants to simulate natural plants, the results show that submerged macrophytes on water flow structure, resistance characteristics have a significant impact. After analyzing the variation law of Manning coefficient, a new semi-empirical equation is proposed to predict the variation of Manning coefficient under different plant density and wave-flow conditions. The Manning coefficient is mainly related to plant density and water flow rate, and is affected by waves. The new equation fits the Manning coefficient well.