三峡水库蓄水后长江中游航道设计水位变化研究

Variation of design navigable water level in middle reach of the Yangtze River after impoundment of Three Gorges reservoir

三峡水库蓄水时间尚短,河床处于不断冲淤调整中,现有航行基准面与航道条件以及现有资料与设计水位确定方法的矛盾日益明显。通过对蓄水前1981—2002年资料进行时段划分的方法,确定出设计水位修正值,对蓄水后河床处于调整期的在实测资料基础上计算得到的设计水位进行修订,确定出蓄水后长江中游河段各站的设计水位,并对比分析蓄水前后设计水位值的变化规律及影响因素。

The time for the impoundment of the Three Gorges reservoir is very short,and the scour and aggradations of the river bed are in continuous adjustment,all of which make both the inadaptability between navigable base level and navigable condition and the contradiction between available data and determining method for design water level more remarkable.Based on the hydrological data of year 1981—2002 before the reservoir,the corrections of the design water level are calculated by time division,the design water level calculated according to the observed dada after reservoir is revised,and the design water level of part hydrographic stations at the middle Yangtze River are determined.This paper compares the variation of the design water level before and after the reservoir,and analyzes the course of change.