基于控制单元划分的南海区广佛跨界水环境治理工程效果评估

针对南海区广佛跨界区域的水系分布特点划分控制单元，通过对2018年区域内治水工程的调研分析，定量分析治水工程效果。跨界区域各控制单元中，水口水道的COD和NH₃-N削减量最大，占比分别为42.9%和62.9%；西南涌的TP削减量最大，占比为60.1%；按行政区划分析大沥镇对COD和NH₃-N的削减贡献最大，占比分别为29.8%和35.4%；狮山镇对TP的削减贡献最大，占比为62.9%。通过建立污染物削减量与水质指标的响应关系，对控制单元合理性进行分析，并提出相应的污染防治对策，可为管理部门制定水污染防治计划及环境整治工程提供技术支持。

EVALUATION ON PERFORMANCE OF WATER ENVIRONMENT PROJECTS IN GUANGZHOU-FOSHAN CROSS-BORDER AREA BASED ON CONTROL UNITS DIVISION

Based on the distinguishing features of water system in Guangzhou-Foshan cross-border area in Nanhai District, different water control units were divided. By investigation and analysis of water environment control projects finished in 2018 in this area, their effects was calculated. In Guangzhou-Foshan cross-border area, the largest reduction of COD and ammonia appeared in Shuikou Channel, whose proportions were 42.9% and 62.9% respectively; the largest reduction ratio of TP, 60.1% appeared in Xinan River. On the aspect of administrative areas, the largest reduction of COD and ammonia appeared in Dali Town, whose proportions were 29.8% and 35.4%; and the largest reduction ratio of TP, 62.9% appearing in Shishan Town. Response relation between water pollutant reduction and water-quality index was established, which could be used to analyse the validity of water control units. Thus, corresponding measures on water pollutant prevention can be put forward, to provide technical support for water pollution prevention and control planning or environmental projects.