从丹江口、葛洲坝水库下游河床冲刷看三峡工程下游河床演变对航道的影响

从三峡工程下游宜昌～城陵矾河段的地形、地貌、河型、河床泥沙组成及河岸、河床的抗冲性等方面与丹江口水库下游黄家港至皇庄河段的比较来看有诸多相似之处,因此它们在工程建成后河床的冲刷模式应是相近的.从这一观点出发,根据丹江口水库下游不同河段河床冲刷平均河底高程降低值△h与水位下降值△Z的关系预测三峡工程建成后对宜昌至城陵矶河段航道的影响.

Influence of Riverbed Evolution of the Lower Reach of the Three Gorge Project on the Channal Analyzed from Downstream Bed Erosion of Danjiangkou and Gezhouba Reservoir

From comparison of topography, geomorphology, river pattern, sedimentation and resistance to erosion of river bank and bed between the lower reach of the Three Gorge Project -from Ytchang to Chenglingji and the lower reach of Danjiangkou Reservoir - from Huangjia-gang to Huangzhuang, it's considered that they are somewhat similar to each other and therefore their bed erosion modes after the completion of the projects will be also similar. From this point of view, on the basis of the relation between everage bed elevation lowering value h and water level lowering value z due to bed erosion of different lower reaches of Danjiangkou Reservoir, the influence of the Three Gorge Project on the channal from Yichang to Chenglingji is predicted.