基于EFDC模型的水乡城镇水网水动力优化调控研究

河流的水动力状态与整体水环境状况息息相关.本研究以同里古镇区水系为例,在数据稀缺,尤其是缺乏水质数据的基础上,通过研究区域实地考察、现场监测、文献调研等方式,确定了研究区域合理的生态流速范围.同时,建立了同里古镇区水系的EFDC水动力模型,并采用情景分析法,对古镇区水系8种不同的调水优化情景进行分析评价.结果表明,当进水泵站以0.42 m3·s~(-1),饮马桥同时以0.5 m3·s~(-1)的流量进水,大东溪桥和会川桥出流口各出流10%,外河闸口出流口出流80%,其余出流口不出流的情况下,同里古镇区水系整体水动力改善条件较好,且大部分河段流速维持在0.05~0.10 m·s~(-1)之间,在同里古镇水系合理的生态流速范围内.这一方案不仅能有效改善同里古镇水系整体水动力状态,且对水质状况的改善,对整体水环境的提升具有良好的促进作用.

Hydrodynamic optimization of urban river network of water towns based on EFDC model

Hydrodynamic condition is closely related to water environment condition. Taking the river network of Tongli water town as an example, a reasonable ecological velocity range for urban rivers was derived through field investigation, field monitoring and literature review. An EFDC-based hydrodynamic model of Tongli's river network was developed. 8 scenarios were designed and analyzed using the developed model. The scenarios analysis showed that the river network of Tongli town was in a better hydrodynamic condition when the inflow was 0.42 m³·s^-1 at water pump station and 0.5 m³·s^-1 at Yinma bridge station and the outflows were 10% of total inflow at both Dadongxi bridge and Huichuan bridge and 80% at water gate. In this scenario, the velocities of most channel segments were between 0.05~0.10 m·s^-1, which was considered a reasonable range of velocity for river network of Tongli town.