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基于椒江干流4个水质站点的水质监测数据,分析了椒江干流的水质现状和主要污染物的演变趋势、空间分布,在此基础上采用MIKE 21二维水动力水质模型预测了不同建闸工程对椒江干流水质的影响。结果表明,椒江干流上游水质为Ⅱ、Ⅲ类,中游水质为Ⅳ类,下游水质为Ⅳ、Ⅴ类,上游水质优于下游水质,近几年水质有改善趋势。若实施建闸工程,闸上水体自净能力将减弱,污染物浓度将有所增加,高锰酸盐指数增幅为0.21~0.51mg/L,氨氮增幅0.01mg/L左右,对干流水质会产生一定负面影响;与头门岛闸址相比,庙龙港闸址方案的影响相对较小。
Based on the water quality monitoring data of four water quality stations in the Jiaojiang River, the status quo of the water quality and the evolution trend and spatial distribution of the main pollutants in the mainstream of Jiaojiang River were analyzed. Based on the MIKE 21 two-dimensional hydrodynamic water quality model, Influence of water quality of Jiaojiang main stream. The results showed that the water quality of the upper reaches of the Jiaojiang River was Ⅱ and Ⅲ, the water quality of the middle reaches was Ⅳ, the water quality of the lower reaches was Ⅳ and Ⅴ. The water quality of the upper reaches was better than that of the lower reaches. In recent years, the water quality had a tendency of improvement. If the sluice gate construction is implemented, the net self-purification capacity of sluice water will be weakened and the pollutant concentration will increase. The permanganate index will increase from 0.21 to 0.51 mg / L and the ammonia nitrogen will increase about 0.01 mg / L, which will produce certain water quality Negative impact; Compared with Taumen Island site, the impact of Tiandongang Harbor site plan is relatively small.