高强度人类活动影响下永定河北京段水质水量模拟

自然条件下的河流水质模型在高强度人类活动影响的城市河流应用中存在局限性,构建耦合人类活动影响的水质模型是识别城市河流水质变化的关键。针对永定河北京段自然水循环与再生水、循环管线回水及外调水等人类活动相互作用的特点,构建了基于分布式时变增益水文模型与一维稳态的水质过程耦合的模型,分析了不同调水情景下永定河北京段水质变化过程。应用表明该模型在永定河北京段具有良好的适用性,不仅能描述过去天然条件、现状条件下水质过程,同时能应用于未来规划情景下的水质预测,同时表明外调水工程对永定河北京段的水量水质有显著的改善作用。

Modeling of Water Quality in Beijing Reach of Yongdinghe River under High Strength Human Activities

The natural river water quality model is usually not applicable in city rivers under high strength human activities; and the water quality model coupling human activities such as water structures is necessary for simulation of the water quality in rivers under the both natural and human activity conditions. In this paper, a water quality model coupling water cycling, water diversion and circulation line engineering with the natural processes was developed to describe the complex water quality processes based on the Distributed Time Variant Gain Model (DTVGM) and one-dimensional stable-state model, which can be used under different scenarios both in the past and future. The results show that the model performs well in the basin. Furthermore, the model was used to analyze the influence of different scenarios of water diversion on the water quality in the river reach. The results also show that the water quality will be improved after the first and second diversion projects, which can provide certain scientific basis for the protection of the water ecological environment in the basin.