水功能区水域纳污能力是污染物入河湖总量控制的基础, 当前水域纳污能力计算较多使用公式的解析解 法, 计算结果较为粗略。选取鄱阳湖九江工业用水区作为研究对象, 采用解析解法和数值解法相结合的方法对鄱 阳湖九江工业用水区纳污能力进行联合求解, 利用解析解法计算水域纳污能力初值, 再以此作为模型启动条件, 通过数值模型对解析解法获得的初始值进行试算检验和优化。计算结果表明, 鄱阳湖九江工业用水区的最优水 域纳污能力 COD 为9 776 t/ a, 氨氮为 142 t/ a。研究统筹考虑了河道形态、岸边流速变化、丰水期长江江水顶托和 倒灌等因素, 弥补了解析解法的局限性, 结果更具合理性, 可为鄱阳湖九江工业用水区水质管理和限制排污总量控 制提供参考。

The assimilativ e capacity of a w ater function zone is the basis fo r gr oss co ntr ol o f po llutants discharg e. At present, the capacity is commonly calculated by ana lyt ical method, but the calculation r esults ar e no t accur ate. In this research, w e too k Jiu2 jiang industrial water funct ion zone beside Po yang Lake as the o bject of r esear ch, and calculat ed its assimilativ e capacity. The an2 alytica l method was used to calculate the initial value, and the numerica l method w as used t o optimize the initia l value. The cal2 culation results showed that the o ptimal assimilative capacit y of Jiujiang industrial w ater functio n zone beside Poy ang Lake for COD is 9 776 t/ a, and that fo r ammo nia nitro gen ( NH32N) is 142 t/ a. This study takes into acco unt such factors as the river mor pholog y, the chang e of insho re velocity , and the effects of characteristic hydrolog ical conditio ns. It can make up fo r the limi2 tat ions of the analytica l method and generate mor e reasonable results. It can prov ide a r eference fo r w at er pollutants g ro ss con2 tr ol in Jiujiang indust rial wat er functio n zone beside Poyang Lake.

国家重点研发计划( 2017YFC0404502) ; 水体污染控制与治理科技重大专项( 2017ZX071082001)