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河(渠)道越来越多采用植草衬砌,它不仅保护河渠岸坡免受冲蚀,还改善生态条件,然而,植物对水流产生拖曳力从而影响河道过流能力.讨论了植物衬砌抗冲蚀效应的主要影响因素,提出了评估植草衬砌河渠稳定性的方法,根据水流拖曳有效剪应力与土壤允许有效剪应力之间的极限平衡条件导出了估算植草衬砌渠道过流能力的公式.实例计算研究表明,百喜草和狗牙根草因其较强的抗冲蚀性和较小的阻水性而比较适合于我国南方河渠衬砌.
The growing use of grass lining in the river (canal) not only protects the river bank from erosion but also improves the ecological conditions, however, plants drag on the water flow and thus affect the overcurrent of the river. The main influencing factors of the lining effect are put forward, and the method of evaluating the stability of the grass-lining river channel is proposed. The formula to estimate the over-flow capacity of the grass-lining channel is derived according to the limit equilibrium between the effective shear stress of the water flow drag and the allowable effective shear stress of the soil. Studies have shown that hippophae and Bermudagrass are more suitable for the canal linings in southern China due to their strong erosion resistance and less water resistance.