不同类型取水口下泄水温试验研究

Experimental study on temperature of water released from intakes of different types

对于温度分层型水库,为了控制灌溉用水的温度以利于作物生长,工程中常采用叠梁门取水口、多层孔型取水口及浮式管型取水口等分层取水措施。目前,缺乏对不同类型取水口下泄水温规律的对比研究。本文依据某水库水温资料,通过试验直接模拟水库水温分布,在相同工况下,对比不同取水口下泄水温规律。试验结果表明,在相同工况下,叠梁门取水口下泄水温大于浮式管型及多层孔型取水口下泄水温。不同类型取水口下泄水温与淹没深度关系较大,与取水流量关系较小。本文研究成果为取水口的选取及运行管理提供理论依据。

Stop log gate intake, multi-level orifice intake, and floating point intake, are often used as engineering measures on thermally-stratified reservoirs to control the temperature of irrigation water for crop growth. Previous studies on temperature of water released from such intakes, particularly comparative studies of different types of intakes, are lacking. This study has conducted experimental tests to model the thermal stratification of a reservoir and compare these three intakes. Results show that the released temperature of stop log gate intake is higher than that of the other two intakes and of all the intakes, the released temperature are closely related with their submergence but nearly irrelevant to their flow rate. This study would lie a basis for selection, operation, and management of reservoir water intakes.