芦苇阻水 河道内众多滩地和改道段生长着芦苇,致使水道河床糙率增大,行洪水位全面抬高,严重削弱了行洪能力,给安全度汛带来了很大威胁。例如,淮河入江水道的三河段,由于芦苇茂密.1991年汛期,三河闸下泄流量为3000立方米每秒时,金湖站水位抬高到10.33米,相当于设计5000立方米每秒的水位,致使入江水道大堤堤脚普遍窨潮渗水,堤上三处出现裂缝,13座涵闸岌岌可危,被 Many reeds and diversions in reeds blocked the growth of reeds, resulting in the river channel roughness increased, the flood plain elevation, seriously weakened the flood capacity, flood safety has brought a great threat. For example, the Sanhe section of the Huaihe River inlet, due to dense reeds.In 1991 flood season, Sanhe gate discharge flow of 3000 cubic meters per second, the Jinhu station elevation to 10.33 meters, equivalent to the design of 5000 cubic meters per second water level, As a result, the levees of the levees of the inlets of the river led to common infiltration of seepage and cracks in the embankments, and 13 sluices were in danger and were