鄱阳湖都昌水位站50年水位特征变化分析

Analysis of character variation of water level at Duchang station of Poyang lake for 50 years

根据鄱阳湖湖区都昌水位站1964-2014年逐日平均水位资料,对比分析了2003-2014与1964-2002年水位变化特征。研究结果表明:年平均最低水位由上升显著趋势变为下降显著趋势,多年平均最低水位出现时间提前了11 d,多年平均最高水位出现时间推迟了13 d;最高水位、最低水位、多年平均水位、年最高平均水位、年最低平均水位均呈现不同程度的下降;退水过程的起末水位变化不大,退水过程历时缩短25 d左右,速率加快。

According to the data of average daily water level in Duchang hydrology station of Poyang lake ,the paper analyzed the feature of water level variety from 1964 to 2002 and from 2003 to 2014. The results show that the lowest water level of average annual changes from significant uptrend to downtrend. The lowest water level of average years appeared 11 days ahead of time and the highest water level of that appeared delayed for 13 days; the highest level, the lowest level, multi -year average level, the highest annual average water level and the lowest annual average water level showed different degrees of decline; the water level of recession process from begin to end changes little. The duration time of recession process shortens 25 days than before and the rate of recession process is accelerated.