汉江红山头至雅口游荡河段的河床演变与航道整治

Channel evolution and regulation of wandering reach between Hongshintou and Yakou on Hanjiang River

本文根据大量水文、泥沙及河床地形资料,对红山头至雅口河段进行了全面深入的分析,找出上游受人工控制后该河段的演变规律及其对航道的影响。上游建水库后对来水来沙条件虽有所改变,但从河床粗化与河床与河岸的相对可动性比较更有利于展宽,并从各种稳定性指标分析,该河段目前尚属游荡性河型的下限。按照纵比降、冲淤及滩槽高差的变化规律的分析,明确了重点整治部位,指出下段冲深、摆动加剧的不利后果,提出一系列整治原则,并可作为同类河流整治参考。

Based on the analysis of numerous hydrological, sedimendary and morphological data at the Hongshantou to Yakou reach downstream of a key water control project in the middle Hanjiang River, the characteristics of river channel evolution, erosion and deposition of the reach and their Influence on the navigation are presented in this paper. The change in flow and sediment condition after the operation of the key water control project seems to activiate the river wandering and to increase the width of channel, as a result, armouring the river bed and weakening the erosion resistance of river bank. Investigation of longitudinal slope, characteristics of channel evolution and the average elevation difference between the shoal and the tough of the reach enlightens the authors to propose the principle and measure of river regulation, which can be used for other similar wandering reaches.