植物生态护岸技术的效果分析—以漳河下游陈村险工为例

根据植物护岸机理，以漳河下游河道陈村险工为具体研究对象，通过数学模型模拟，分析了植物根部的加筋作用和植物地面以上部分对水流拖曳力的分担作用，及其对减缓丁坝冲刷的贡献。研究发现：种植植物后水流对丁坝附近土壤的有效拖曳力虽然随流量的增大而增大，但增幅减缓，说明植物的阻滞作用也随流量的增大而增大；在研究的流量范围内，种植植物后丁坝的冲刷深度比种植植物前减少了40～126 cm。 In this paper, the bank protection mechanism and effects of plant technology were introduced. A mathematical model was developed to analyze the soil reinforcement by the plant root system and the reductions of flow drag force and scouring around spur dike by the above-ground parts of plant based on a flood control construction (spur dike) located in the downstream reach of Zhang River at Chengcun. The results showed that although the effective flow drag force near the soil of spur dike increases with the increasing of flow rate after the planting, the increment decreases, which indicated that the reduction function of the plants increases with the increasing of flow rate. Moreover, the study concluded that the scour depth of the flood control construction (spur dike) reduced by 40 to 126 cm in the range of studied flow rates. 教育部新世纪优秀人才支持计划基金项目(NCET-09-0586)；海河流域典型河流生态水文效应研究（201101018）；水利部公益性项目（201201114）；国家国际科技合作专项（S2013BGR0244）