闸控河段水质多相转化模型

针对闸控河段水质转化机理复杂的特点,提出在“水体-悬浮物-底泥-生物体”界面内开展水质多相转化研究的总体思路,推导了描述各种相态水质之间传质过程的数学表达式,构建了具有一定物理机制的闸控河段水质多相转化模型.结合槐店闸调度影响实验数据,对水质多相转化模型进行了参数识别和验证,进而模拟了不同相态水质成分的时空变化过程.结果发现:来水流量和闸门调度方式使闸上和闸下断面各相水质浓度发生变化,同时影响到藻类的生长和富集状态;闸门调度会改变闸上、闸下河段的水质主导反应机制;由于闸门调度增加了对水体的扰动,水体与外界的物质交换效果增强;在实验前期蓝藻数量的变化主要受水流的迁移作用影响,在后期闸上断面主要受闸门阻隔的影响,闸下断面主要受流速、流量和营养物质浓度改变等作用综合影响.

Multi-phase transformation model of water quality in the sluice-controlled river reaches

On analysis of the complicated characteristics of the water quality transformation mechanism in sluice- controlled river reaches, the multi-phase transformation of water quality based on the mutual regulation of water body, suspended matters, sediments and organisms was put forwarded. First of all, a group of mathematical expressions describing the mass transportation processes among different phase states of water were derived. Then, a multi-phase transformation model of water quality in sluice-controlled river reaches with certain physical mechanisms was established. Finally, the experimental data of Huaidian Sluice operation was used to identify and validate the parameters of the multi-phase transformation model of water quality, and to simulate the spatial and temporal change processes of water quality ingredients among different phase states. The following findings were discovered from the results: The concentration change of each phase water quality in upstream and downstream are affected by the flow and the gate operation mode, also was the algae￠s growth and enrichment state. The reaction processes in upstream and downstream show different leading reaction mechanisms with the change of sluice operation. Increasing the disturbance to water body, sluice operation leads to stronger exchanges between water body and external matters. The change of cyanobacteria (PCY) quantity in the early test period is mainly affected by water migration, in the later test period, the change of PCY quantity in the upstream section is mainly affected by the obstruction of sluice, and in the downstream section is comprehensively influenced by flow velocity, flow and change of nutrient concentration.