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在长江口北支上口建闸堵堵后,其下游会不会出现新的险情;淤积土地的速度是快还是慢?现根据有关资料做点初步分析,以回答这二个问题. 一、现有护岸工程将分段出现险情 长江口北支西起E121°08’、N31°47’,东至E121°53’,河槽中心线的长度为75km.据1981年水下地形图计算,河床容积为28.07×10~8m~3(按长办吴淞基面4.5m以下
In the mouth of the northern branch of the mouth of the Yangtze River to block the construction of blocked gates, the downstream danger will not appear a new danger; silt land is fast or slow speed? Are based on the relevant information to do some preliminary analysis to answer these two questions. The existing revetment project will be subdivided into sections in danger. The north branch of the Yangtze Estuary starts from E121 ° 08 ’, N31 ° 47’, east to E121 ° 53 ’, and the centerline of the river channel is 75 km. According to the 1981 underwater topographic map, Volume 28.07 × 10 ~ 8m ~ 3 (according to long Wusong 4.5m below the base surface