闸控河段水质转化机制研究Ⅱ:主导反应机制

Research on water quality transformation mechanism in Sluice-controlled river reachesⅡ. Identification of the major reaction mechanism

根据前文提出的闸控河段水质多相转化模型,设置不同的水闸调度情景,进一步开展在不同水闸调度情景下的水质浓度数值模拟;引入"贡献率"的概念,定量评估水闸调度在水质多相转化过程中所起的作用大小,分析水闸调度对水体中各种反应机制的驱动作用,识别其中的主导反应机制。通过分析发现:水闸调控对水质多相转化的贡献率随着闸门调度方式的改变而变化,且水质转化表现出不同的主导反应机制;当闸门维持小开度放水时,吸附、沉降等作用的主导性显著增强,而闸门维持大开度放水时,解吸、再悬浮等作用主导性显著增强;不同反应之间的主导性强弱在闸门调控方式的改变下交替变化。

According to the multi-phase transformation model of water quality proposed in the preceding pa-per, different scheduling scenarios of sluice were set to further develop the water quality concentration nu-merical simulation. Then the concept of＂contribution rate＂ was introduced, which can quantitatively evalu-ate the effect of sluice scheduling in the process of multi-phase transformation of water quality, and ana-lyze the driver effect of different scheduling schemes on various reaction mechanisms and identify the lead-ing reaction mechanism. The results show that contribution rate of sluice scheduling for multi-phase transfor-mation of water quality changes with sluice scheduling methods changing, and water quality transformationshowed different leading reaction mechanisms. When the sluice gate is in a small opening, the dominantrole of adsorption and sedimentation will be significantly enhanced. On the contrary,the leading role of de-sorption and resuspension will be enhanced when the sluice gate in a large opening. And the leading roleof different reaction changes alternately with sluice scheduling methods changing.