珠江三角洲水位变化趋势及其影响分析

Analysis of the Trend of Water Level Change in Pearl River Delta and Its Effects

珠江三角洲网河区 5 0年代至 60年代大规模联围筑闸后 ,对以洪为主的河道 ,上下游高高潮位或低低潮位都有所壅高 ,且壅高值为上游大于下游 ,沿河而下呈递减变化 ;对以潮为主的河道 ,高潮位或低潮位都呈上升趋势 ,且低潮位上升明显。河道泥沙淤积也促使洪水位不断提高。另外 ,预计未来 5 0a海平面上升将使网河区水位相应地抬升 ,其中对以径流为主的河口如磨刀门水位影响较小 ,对以潮流为主的河口如虎门、蕉门水位影响较大。

Since large-scale connection of embankments with constructing sluice gates in the waterway network area of the Pearl River Delta in the fifties and sixties,in channels where runoff is dominant,higher high water level and lower low water level have been raised both upstream and downstream with value being greater upstream than downstream and decreasing along the course successively.While in channels where tide is dominant,both high water level and low water level have trended towards raising with the latter being more obvious.Silting in the channels has cuased water level to rise continuously.Besides,it is estimated that the rising sea level will lead to the rising of water level in the waterway network area correspondingly in the coming 50 years,and effects will be less in runoff-dominant outlets such as Modaomen and greater in tide-dominant outlets such as Humen and Jiaomen.