高度城镇化地区河网水系生态调控方案

为探究长三角高度城镇化地区河网水系生态调控方案,以秦淮河流域下游地区水系为例,采用生态功能设定法,计算了各河段生态水位和生态流量.通过构建一维水量水质模型,在枯水年非汛期水量调控及截污措施协同驱动下,对水位、流量及污染物浓度的时空分布特征进行多情景数值模拟,并对生态水量保障率及水质改善效果进行评估.结果表明,水位调控措...

Ecological regulation scheme of river network and water system in highly urbanized areas

In order to explore the ecological regulation scheme of river network and water system in highly urbanized areas of the Yangtze River Delta, taking the water system in the lower reaches of Qinhuai River Basin as an example, the ecological water level and ecological flow of each reach were calculated by using the ecological function setting method. By constructing a one-dimensional water quantity and quality model, driven by the coordinated control of water quantity and pollution interception measures in non-flood season of dry years, the temporal and spatial distribution characteristics of water level, flow and pollutant concentration were simulated, and the ecological water quantity guarantee rate and water quality improvement effect were evaluated. The results show that the water level regulation measures have very limited effect on water quality improvement, and cannot guarantee the demand of river ecological base flow. The regulation effect of diversion measures is obvious, but the increase of water quality improvement rate decreases with the increase of diversion flow. The water quality improvement effect of pollution interception measures is better than that of water regulation scheme, but there is significant spatial heterogeneity and cannot improve the guarantee rate of ecological base flow. Combining pollution interception measures with water diversion measures is the best choice to meet the requirements of ecological water quantity and water quality of urban water system.