临海至椒江大桥段采砂对椒江河口的水动力影响研究

Research on hydrodynamic influence to Jiaojiand River estuary for taking sand from Linhai-Jiaojiang Bridge reach

随着社会经济的发展,椒江河口采砂活动日益频繁。采砂改变河床条件,必然对河口区水动力条件产生明显影响。这种影响主要表现在低潮位降低,高潮位抬升,潮差和纳潮量均增大,潮流流速增加。在临海至海门河段,这种影响越往河口段上游越明显。通过研究椒江河口采砂前、后的河口水动力变化,分析影响产生的机理。

With the development of social economy, the activity of taking sand in Jiaojiang River estuary is frequent with each passing day. It will change the river bed condition to take sand in estuary and the hydrodynamic condition in estuary is obviously influenced. The influence shows that low fide level will be reduced and high fide level raised, as well as tidal range and bearing fide amount enhanced and tidal current velocity increased. This kind of influence in river reach from Linhai to Haimen is obvious especially in estuary reach upstream. The hydrodynamic changes before and after taking sand are studied and the variation mechanism analyzed in the paper.