闸控河段水质转化机制研究Ⅰ:模型研制

Research on water quality transformation mechanism in Sluice-controlled river reachesⅠ. Development of the mathematical model

从闸控河段水环境系统的复杂作用机理出发,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。综合运用环境水力学、吸附-解吸动力学、水生生物生长动力学等理论,推导了描述各种相态水质成分之间传质过程的数学表达式。以MIKE 11模型为基础,建立了具有一定物理机制的闸控河段水质多相转化模型。结合2013年4月和2014年11月两次槐店闸调度影响实验数据,对水动力学模型和水质多相转化模型进行了参数识别和验证,并对实验期间溶解相和悬浮相物质的转化规律进行了分析。结果发现:水流流速和闸门调度方式对闸上和闸下断面各相水质浓度变化均有显著的影响,且闸门调度方式变化越频繁,水质多相转化越复杂。

Based on the complex action mechanism of water environment system in the sluice-controlled riv- er reaches, the general idea of multi-phase transformation of water quality in the interface of water body, suspended solids, sediment and organism was proposed. Firstly, the mathematical expression was derived to describe the mass transfer process among different phase states by application of environmental hydraulics, adsorption-desorption kinetics, and aquatic biological growth dynamics theory. Secondly, the water quality multi-phase transformation model in the sluice-controlled river reaches with a certain physical mechanism was established on the basis of MIKE 11 model. Finally, the parameters of hydrodynamic model and water quality multi-phase transformation model was identified and validated combined with the Huaidian Sluice scheduling experimental data in April 2013 and November 2014, and the transformation rule of dissolved phase and suspended phase in experimental period was analyzed. The results show that the flow velocity and the sluice scheduling mode have significant effect on the water quality concentration change of different phase states in the upper and lower section of the sluice, and the more frequently the sluice scheduling changes, the more complex the water quality multi-phase transform process will be.