基于QUAL2K模型的秦淮河水质优化方案

Water quality optimization scheme for Qinhuai River based on QUAL2K model

根据秦淮河水情水质特点,结合QUAL2K水质综合评价模型,选取DO、NH3-N、COD作为模拟因子,在汛期与非汛期,分别对南河莲花闸及象房村泵站是否开闸引水两种工况进行模拟和参数率定,构建秦淮河水质优化管理模型。结果表明:在南河、内秦淮河泵站引水的情况下,汛期引水量为40m3/s时基本满足Ⅴ类水标准,非汛期引水量为60～70 m3/s时全段达到Ⅴ类水标准,其中秦淮新河段达到Ⅳ类水标准;在南河、内秦淮河泵站(含闸段)均不引水的情况下,汛期长江自流流量为30 m3/s时能达到Ⅴ类水标准,非汛期当抽水站抽水流量为40～50 m3/s时达到全段Ⅴ类水标准,其中秦淮新河段水质达到Ⅳ水标准。

With the aim of constructing a water quality optimization model for the Qinhuai River, based on the characteristics of the water regime and water quality of the river, the QUAL2K water quality evaluation model was used to simulate the operation process of the Lianhua Sluice on the Nanhe River and the pumping station of the Xiangfang Village under conditions of opening and not opening sluices in flood and non-flood seasons. The model＇ s parameters were calibrated, with DO, NH3-N, and COD used as the simulating factors. The following conclusions can be drawn： With water diversion to the Nanhe River and the internal Qinhuai River, the water quality of the Qinhuai River can reach the grade V standard when the volume of water diversion reaches 40 m3/s in the flood season and 60 to 70 m3/s in the non-flood season, and the water quality of the new reach of the Qinhuai River can even reach the grade IV standard in the non-flood season. Without water diversion to the Nanhe River and the internal Qinhuai River, the water quality of the Qinhuai River can reach the grade V standard in the flood season when the flow rate from the Yangtze River reaches 30 m3/s, and the water quality of the Qinhuai River can also reach the grade V standard in the non-flood season, with the water quality of the new reach of the Qinhuai River reaching the grade 1V standard, when the pumping rates at the pumping stations on the Nanhe River and the internal Qinhuai River reach 40 to 50 m3/s.