基于水电比拟方法的山东南四湖上级湖流场研究

利用水电比拟方法模拟了南四湖流场结构。同时,基于HAMSOM模式,对其流场进行了数值模拟,所得结果与水电比拟结果一致,两者平均相关系数在0.94以上,表明水电比拟实验技术路线可行,流场基本结构准确。该方法适用于低流速大流场的模拟。流场结构分析表明,湖区流速在汛期为cm/s量级,非汛期仅为mm/s量级。其中,在南阳湖北部...

STUDY ON ELECTRO-HYDRODYNAMIC ANALOGUE AND NUMERICAL SIMULATION OF FLOW FIELD IN THE UPPER NANSI LAKE OF SHANDONG

A comprehensive understanding of flow field is essential on studying how to reduce pollution and improve water quality in the upper Nansi Lake of Shandong, China. Since the water current velocity is very small in most regions of the lake, it is difficult to obtain data on the flow field by using common instruments. An easy experimental method of electro-hydrodynamic analogue was developed in this paper to simulate the flow field of the upper Nansi Lake. In order to test the accuracy of electro-hydrodynamic analogue result, the numerical simulation of the flow field by HAMSOM model was also carried out to compare the data from both sets of experiments. The result of electro-hydrodynamic analogue was found resemble strongly to those obtained from the numerical simulation, and the averaged correlation coefficient of these two methods is bigger than 0.94. Therefore, the result obtained from electro-hydrodynamic analogue was accurate when simulating the flow field at low velocity. It is found to be a reliable method to study the flow field in lakes and other slack water areas. The results showed that the flow is very weak in the upper Nansi Lake. In non-flood seasons, the velocity is only in millimeter per second, whereas in flood seasons, the velocity is in centimeter per second.. Low velocity regions were found in the northern part of Nanyang Lake and the northeastern part of Dushan Lake while high velocity regions were found at the connection part of the Nanyang Lake and the Dushan Lake, and the vicinity of the Erji Dam. The above flow fields have given insight on the dispersion of contaminates in the upper Nansi Lake, and the intensity of the improvement of the water quality can be deduced.