Abstract
Water intake with fixed height limits the application of selective withdrawal technology in a certain degree. This study proposes a technological idea to install baffles on water intake. Through the rotation of upper and lower baffle, poor water layer can be blocked. A Computational Fluid Dynamics (CFD) model for the upper baffle on water intake is constructed. The results show that the baffle installed on the upper part of orifice can reduce the withdrawal layer thickness and flow on the upper part of orifice centre. Thereby, the withdrawal flow on lower part can be indirectly increased. While, baffle length and inclining angle are the important factors to influence the withdrawal layer thickness and flow distribution. Therefore, the adjusting range of selective withdrawal can be economically enhanced by installing baffles on water intake.
Highlights
From late spring to early winter, obvious temperature stratification can be found on the reservoirs with water depth that exceeds 10 m
The upper and lower withdrawal layer thicknesses, which are 10.7 m and 12.5 m respectively, show little difference; Fig. 3b displays the streamline diagram of the simulation result of 4 m horizontal baffle
By opening and rotating the upper baffle, water flow can be blocked and the blocking effect can be adjusted by changing baffle length and inclining angle
Summary
From late spring to early winter, obvious temperature stratification can be found on the reservoirs with water depth that exceeds 10 m. Thermocline isolates the mass transfer process between surface and hypolimnion. This isolation causes the anaerobic or anoxic condition of the bottom of reservoir, which leads to the high content of nutrient salt in sediment. Dissolved oxygen deceases with the increase of water depth [1,2,3,4,5,6,7]; with the rapid development of social economical development, in the surface layers of many reservoirs, water seasonal algae are in high incidence due to point source pollution, non-point source pollution and internal pollution [8,9,10]. The factors above deteriorate the inlet raw water quality of water plant and increase the difficulty and cost in purification
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