狗牙根护坡不同实施处理方式下堤坝产流产沙特征

Characteristics of runoff and sediment yield of different Cynodon dactylon protection models in Huai River levee

研究狗牙根护坡实施处理方式对堤坝水土流失过程的影响,对于科学指导堤坝生物护坡与控制水土流失具有重要的意义。采用人工模拟降雨方法,对淮河大堤狗牙根护坡成坪处理、栽植处理、茎植处理和种植处理4种不同实施处理方式的径流、泥沙在不同降雨条件下的水土流失特征进行研究。结果表明:不同实施处理方式下的堤坝径流和泥沙流失差异明显;不同降雨强度条件下,栽植处理产流量小,但产沙量明显高于茎植处理和成坪处理,茎植处理产流量大,产沙量小,具有减沙不减流的特点,种植处理产流产沙量大,且随着降雨强度的增强而明显增大。研究结果可为选择狗牙根堤坝护坡实施处理方式提供参考。

Different treatments with Cynodon dactylon on dam protection will have effects on soil and water loss processes under different rainfall types,which will had great significance to guide dam protection and soil and water loss control.Responses of soil and water loss characteristics to rainfall types were studied by simulated rainfall under 4 dam proctection treatments with Cynodon dactylon in Huai River levee.The results showed that there were obvious differences in soil and water losses between different treatments.At each rainfall intensity,runoff with planting treatment was small,but sediment yield was significantly higher than that with the turf treatment and stem cover treatment.Runoff with stem cover treatment was great,but sediment was small,which means reducing sediment with no runoff reduction.Runoff and sediment yield with sowing treatment were great,and significantly increased with rainfall intensity.This study results would provide reference for optimizing implementation model of dam protection with Cynodon dactylon.