基于水质目标的平原河网水力调控阈值研究

Values of Plain River Network Hydraulic Regulatory Threshold Based on Water Quality Objectives

该文以无锡市滨湖河网水力调控作为研究基点,通过数值模拟,分析调水对河网水质浓度时空分布影响,揭示河网水质对调水的响应机制,针对具体河道逐条提出基于水质改善目标的水力调控阈值,为水环境治理提供理论依据。研究结果表明,边界浓度的影响在水力调控过程中至关重要,水力调控应建立在相对较好的边界条件上,优化水资源分配,改善整体河网水质。水位的调控并未呈现出一致性规律,水位的增加对河网水质改善不一定呈现积极作用。调整水位与流速的措施均是通过边界引入水源,对于一般河道的水力调控,调整流速和水位均可以作为常规调控手段。

The paper takes the hydraulic regulation of the river network in Wuxi City as the research base point.Through numerical simulation,the influence of water diversion on the temporal and spatial distribution of water quality concentration in river network is analyzed,and the response mechanism of water quality in river network to water diversion is revealed,and proposes one by one for 20 specific rivers.The threshold of hydraulic regulation based on the goal of water quality improvement provides a theoretical basis for water environmental governance.The results indicate that the influence of boundary concentration is very important in the process of hydraulic regulation.Hydraulic regulation should be based on relatively good boundary conditions to optimize water resource allocation and improve the overall river network water quality.The regulation of water level does not show a consistent law,and the increase of water level does not necessarily have a positive effect on the improvement of river network water quality.The measures to adjust the water level and flow rate are to introduce the water source through the boundary.For the hydraulic regulation of general river,the regulation of flow velocity and water level can be used as conventional regulation means.