Effect of Sluice Operation on Degradation Coefficient of Typical Pollutants in Different Form Reaches of Danhe River
The barrier effect of sluice on the river changes the velocity and discharge of the river,causes the change of the river shape,changes the transport of pollutants,and directly affects the water environment capacity of the river.In this study,the Danhe River under the control of small sluice is taken as the research object.The river water quantity is controlled by sluice operation,and the influence of river velocity on pollutant degradation coefficient is explored.The re-sults show that the degradation coefficients of COD,BOD5 and TP in the experimental reach except TN have significant linear regression relationship with the flow velocity of the reach(p＜0.01).The degradation coefficients of different pol-lutants increase with the increase of the flow velocity,and the degradation coefficients of pollutants in the straight river section are significantly higher than those in the curved river section.After opening the sluice,the degradation coefficients of COD,BOD5,TN and TP increase in the straight river section,while the degradation coefficients of COD,BOD5 and TP decrease in the curved river section,and only the TN degradation coefficient increases.After opening the sluice,the flow velocity of straight river section increased by 0.14 m/s,and the degradation coefficients of COD,BOD5,TN and TP in-creased by 0.94,0.30,0.72 and 1.93 d-1,respectively.The flow velocity of curved river section increased by 0.01 m/s,the degradation coefficients of COD,BOD5 and TP decreased by 0.44,0.28 and 0.38 d-1,and the degradation coefficients of TN increased by 0.87 d-1.
sluicedegradation coefficientstraight river sectioncurved river section
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