摘要
丹江口水库蓄水运用以后,下游河段来水来沙发生改变,引发兴隆以下(特别是兴隆至新泗港河段)的河流再造床过程,河床发生了冲刷调整。文章基于对该河段建库以后原型观测资料,分析了兴隆至新泗港这一宽浅弯道段河道的冲淤变化情况,并结合本河段的水流泥沙运动特性,阐述了该河段浅滩碍航机理。结论表明,兴隆至新泗港河段由于河道断面宽浅,河床可动性强,使得河段内洲滩年内年际间变化大,航道条件较差,特别是丹江口水库运行以后该河段发生了较大强度的冲刷,目前冲刷仍在继续,但冲刷强度已有所减弱;河段浅滩碍航与汛后退水快慢有关,退水较快则发生碍航,退水较慢则不会碍航。
Since the Danjiangkou reservoir began to store water and run, water and sediment to the downstream reach has changed, resulting in the process of river transformation on the reach from Xinglong to Xinsigang and erosion of the bed. Based on the prototype observation data of the reach after construction of Danjiangkou reservoir, the silting and erosion of river bed of this broad-shallow and bend reach is analyzed. Combining with the moving characteristic of water and sediment, mechanism of shoal＇s navigation-obstruction is also explored. The result shows that, shoals on this reach change very fast and the navigation condition is poor because the reach is broad and shallow and the river bed has stronger mobility, especially after running of Danjiangkou reservoir, the river bed has been eroded a lot. Right now, the erosion is still lasting, however, the intensity has been weakened. The result also reveals that the shoal＇s navigation-obstruction has something to do with the velocity of water fall after flood： fast fall will result in navigation obstruction, and slow fall will not.
出处
《水运工程》
北大核心
2008年第4期76-79,共4页
Port & Waterway Engineering
基金
国家科技支撑计划项目(2006BAB05B03-05)
976项目(2003CB415205)
国家自然科学基金项目(50479036)
湖北省创新群体基金项目(2003ABA195)
博士点基金项目(20020486017)资助
关键词
兴隆至新泗港河段
河道演变
丹江口水库
浅滩
river reach from Xinglong to Xinsigang
river-course evolution
Danjiangkou reservoir
shoal
