基于闸、泵联合调度的半封闭水体活水工程

Semi-closed Water Flowing Project Based on Joint Scheduling of Sluice&Pumping Station

东坡湖是受潮汐影响的半封闭水体,水面面积大,水动力条件差,水体停留时间长,有利于藻类繁殖,富营养化特征明显。为了改善东坡湖的水动力条件,采取了进出口改造、设置活水泵站和节制闸等活水工程措施。通过闸、泵联合调度,水体活水时间由22.3 d减少到13.2 d。活水工程实施后,综合营养状态指数为48~66,呈现逐渐下降的趋势,处于中营养~中度富营养化状态,但现状已实施的活水工程不足以彻底解决东坡湖的富营养化问题,亟需实施其余规划工程。

Dongpo Lake is a semi-closed water with tidal influence.It has large water surface area,poor hydrodynamic condition and long-term retention time,which create favorable hydrological conditions for algae bloom and lead to eutrophication.In order to improve the hydrodynamic conditions of Dongpo Lake,water flowing engineering measures such as culvert reconstruction,setting pumping station and sluice were adopted.Through the joint scheduling of sluice&pumping station,the retention time of water was reduced from 22.3 days to 13.2 days.After the implementation of the water flowing project,the trophic level index(TLI)is 48-66 in a state of mesotropher to middle eutropher,showing a gradual decline.Since the current water flowing projects that have been implemented are not enough to completely solve the eutropher problem of Dongpo Lake,the other planning projects are urgently needed.