水力跌水对硬化河道水体复氧效果的研究

采用硬化河道水力跌水复氧小试装置,研究了跌水高度、跌水流量、跌水深度、进水DO浓度等因素对硬化河道水力跌水复氧效果的影响。试验结果表明,跌水高度为0.6 m条件下水力跌水对硬化河道水体的复氧效果,优于跌水高度为0.2 m和0.4 m时的复氧效果;跌水流量为150 L/h条件下水力跌水复氧效果,优于跌水流量为50 L/h和100 L/h时的复氧效果;跌水深度为0.4 m条件下水力跌水复氧效果优于跌水深度为0.2 m时的复氧效果。水力跌水措施对硬化河道水体的复氧效果整体上与跌水高度、跌水流量、跌水深度呈正相关,与进水DO浓度呈负相关。

Study on Reoxygenation by Waterfall in Urban Completely Hard River

The effects of waterfall height ,flow ,depth ,influent DO concentration on waterfall reoxygenation in urban com-pletely hard river are studied in a hydraulic waterfall reoxygenation pilot reactor .Results show that the effect of reoxygenation under the condition of waterfall heigh of 0 .6 m is better than that with height 0 .2 m and 0 .4 m ,the reoxygenation effect with waterfall flow 150 L/h is better than that with the drop flow 50 L/h and 100 L/h and the reoxygenation effect with drop depth under 0 .4 m is superior to that when drop depth 0 .2 m .The reaeration effect of hydraulic drop measures on urban hard river in the whole is associated positively with waterfall height ,flow and depth and negatively correlated with DO con-centration of influent .