摘要
基于滇池流域长时间序列的降雨数据、河湖水质数据以及各类型排口水质数据,分析了滇池流域河湖水质变化对降雨的响应关系,提出了汛期污染分区控制的相关对策建议.结果表明:近年来滇池流域降雨集中程度增加,短时强降雨事件发生频率增大,汛期污染控制难度增大;河湖水质整体上呈现出汛期主要污染物浓度高于非汛期的现象,入湖河道氨氮和总磷与降雨量呈现出明显的正相关性;汛期污染主要来自于河道沿岸的合流制排口、种植业排口和分流制雨污混接口的排放;为提升汛期污染防治的精细化水平,建议按照城郊面山洪水冲击控制区、主城中心合流制污染控制区、二环外合流制溢流污染控制区、分流制排水系统混流及径流污染控制区、农业农村面源污染控制区来对滇池流域汛期污染进行分区控制.
Abstract
Based on long-term rainfall data,water quality data of river,lake,and discharge outlets,this study evaluated the change in water quality of Dianchi Lake Basin and its response to rainfall.The countermeasures and suggestions for pollution control during the flood season were put forward.The results showed that:Dianchi Lake Basin had experienced a rise in rainfall intensity and short-term heavy rainfall frequency.During the flood season,pollution management was more challenging in recent years.The concentration of main pollutants was higher during flood season than that during non-flood season,and ammonia nitrogen and total phosphorus showed a clear positive association with rainfall.Combined overflow outfalls,planted outfalls,and mixed drainage drainage outfalls along river banks were the principal sources of pollution during flood season.In order to improve the fine level of pollution control in flood season,it was suggested to control the pollution during flood season in Dianchi Lake Basin by partition management to divide into the suburban mountain flood impact control area,the main city center combined overflow pollution control area,the combined overflow pollution control area outside the second ring road,the mixed flow and runoff pollution control area of the shunt drainage system,and the agricultural and rural non-point pollution control area.
基金项目
长江生态环境保护修复联合研究(二期)项目(2022-LHYJ-02-0511-01)
云南省技术创新人才培养对象项目(202305AD160060)
NETL
NSTL
万方数据