论文部分内容阅读
为评价LID技术对开发后区域降雨径流的控制效果,以浙江省嘉兴市南湖区世合小镇为例,应用i-Tree软件,根据模拟区域的土壤类型、地形、降雨量、蒸发量及土壤覆盖等基础数据和径流污染物浓度监测数据,针对历史(2006年)、开发后未实施LID和规划实施LID三种情景,通过模拟分析研究区域内雨水径流总量和污染物负荷的变化来评估LID技术的应用效果。结果表明,规划实施LID情景与开发后未实施LID情景相比,可削减31.52%的径流总量;与开发前相比,仅增加9.96%的径流总量;径流量与土地覆盖类型有关,不透水表面径流量、年径流总量与树木植被呈负相关,而基流流量和透水表面径流量与树木植被呈正相关。规划实施LID情景相比开发未实施LID情景,3种污染物年负荷总量减少了513.66kg,其中分别削减了49.85%的TSS负荷、50.30%的COD负荷和36.36%的TP负荷,削减效果明显。
In order to evaluate the control effect of LID technology on the rainfall runoff in the developed area, taking Shihe town in Nanhu District, Jiaxing City, Zhejiang Province as an example, i-Tree software was used to analyze the soil type, topography, rainfall, evaporation and soil Coverage and other basic data and runoff pollutant concentration monitoring data for the history (2006), after the implementation of the implementation of the LID and planning the implementation of LID three scenarios through the simulation analysis of the study area rainfall runoff and pollutant load changes to assess LID technology application effect. The results show that the planned implementation of the LID scenario can reduce the total runoff by 31.52% compared with the scenario without the implementation of the LID scenario. Compared with the pre-development scenario, the total runoff increased by only 9.96%. The runoff is related to the land cover type and not Permeable surface runoff, total annual runoff and tree vegetation were negatively correlated, while base flow and pervious surface runoff were positively correlated with tree vegetation. Compared with the scenario of implementing LID, the total annual load of three pollutants decreased by 513.66kg, the reduction of TSS load by 49.85%, COD load by 50.30% and TP load by 36.36% respectively, and the reduction effect was obvious .