武汉长江杨泗矶采砂对局部河道的影响分析

Analysis of influence of sand mining at Yangsiji on local river channel in Wuhan City

河砂的采挖活动改变了局部水流动力条件,破坏了天然情况下的泥沙冲淤平衡。为了有效掌握和控制采砂对局部河道的影响,以长江中游武汉河段神龙三厂二期吹填采砂项目为背景,研究了杨泗矶采砂对局部河道的影响。研究成果表明,杨泗矶采砂活动对局部河床地形、局部流场和床沙级配将带来一定的影响,但经过一段时期的河床自我调整,这种变化将会得到一定程度的恢复,对采砂区局部河道河势造成的影响有限。

The mining of river sand will change the local hydrodynamic conditions and destroy the scouring-silting equilibrium under the original conditions.In order to effectively understand and control the influence of sand mining on the local fluvial regime,in the case of the Phase II of Dredger Fill Project of Shenlong third factory at Wuhan Reach of Yangtze River,we researched the impact of sand mining at Yangsiji on the local river evolution.The results show that the local sand mining activities will bring some impacts on the river bed topography,local flow field and bed material gradation,which can be recovered after self-adjustment of the riverbed.Therefore,the impact of the sand mining on local river regime is limited.