基于MIKE模型的水华应急处理情景分析

基于MIKE模型的基础理论,建立了九龙江河段的水动力模型和水质模型,通过情景设计来分析水华应急处理方案的效果。分析结果显示:(1)水电开发降低了河道流速,特别是回水河段流速;(2)为满足抑制藻类生长的流速要求,需要增加目前的电站最小下泄流量;(3)当削减入河污染物排放时,河道污染物浓度降低,面源污染影响大于点源污染影响;(4)增加电站下泄流量和削减入河污染物可抑制水华发展。

MIKE model-based scenario analysis of emergency control of algal bloom

Based on the basic theory of MIKE model，the hydrodynamic model and water quality model for the river reach of Jiulongjiang River are established，and then the effect of the scheme for the emergency control of algal bloom is analyzed herein through the relevant scenario design. The analysis result shows that：（1）the velocity of the flow in the river channel is reduced by the hydropower development，especially the velocity in the back water reach；（2）in order to meet the requirement for restricting the growth of the algae，the minimum discharging flow rates from the existed hydropower stations therein are necessary to be increased；（3）when reducing the pollutant discharged into the river，the concentration of pollutant in the river channel is to be lowered with a larger impact of non-point source pollution than that of the point source pollution；（4）the development of algal bloom can be restricted by increasing the discharge from the hydropower stations and reducing the pollutant discharged into the river.