基于综合功能辨识的城市河湖生态流量计算模型及应用

为了合理确定河湖生态流量的阈值,针对城市河湖功能的特点和实际,综合体现河湖多种生态服务功能目标的协调、河流断面与湖泊/湿地的耦合关联以及生态流量消耗与非消耗分项、存量与通量、水量与水质关系,构建了基于综合功能辨识的城市河湖生态流量计算与保障程度分析模型(MUSEF模型)。利用该模型可对城市河湖生态流量大小、流量过程、流量构成、流量空间分布以及变异性进行量化计算与优化辨识,对不同来水频率条件下生态流量的满足程度进行评价,明确生态流量的调控指标要求与时机,从而为城市河湖生态保护与健康管理提供定量工具。以株洲市区河湖水系为案例开展应用,量化得出了河湖生态流量的逐月过程线、生态流量构成以及变异性特征,分析提出了不同来水频率条件下河湖生态流量的满足程度、调控指标与调控时机,为株洲市河湖生态流量的有效管理和安全保障提供依据。

Ecological flow calculation in urban rivers and lakes base on synthesized ecosystem service function identification: model and application

For reasonable determination of the threshold of ecological flow of urban river and lake,an innovative model for urban ecological streamflow calculation based on synthesized ecosystem service function identification (i.e. MUSEF model) is developed, considering their basic characteristics, multiple ecological functional goals and hydraulic connections, reflecting the relationships between the consumption and non-consumption items, the stock and flux constitutes, the quantity and quality reactions. By setting multiple ecological function targets,the model can present the ecological flow time series,composition,variability, spatial distribution, and the degree of satisfaction under different scenarios, and provide a quantitative tool for ecology protection and health management of urban river and lake. Taking Zhuzhou city in China as an example,the monthly regime,composition and variation characteristics of ecological streamflow in typical river sections and lakes were quantitatively given, and the satisfaction degree and regulation requirement under different hydrological frequencies were analyzed to promote effective urban water management.