太浦河金泽水源地大莲湖示范区水系水环境状况调查研究

Investigation of the environmental status of water at the Dalian Lake demonstration area in the Jinze water source area of Taipu River

以大莲湖为研究对象,以大莲湖周边水体的水文、水质的调查数据为依据,研究了大莲湖示范区水系水环境现状以及地表径流污染情况.结果表明,金泽水源地水质大部分能够满足地表水Ⅲ类水标准,但部分指标存在季节性差异,使得金泽水源地水质总体上不能稳定达标.大莲湖示范区周围水体多为缓流水体(流速0~0.03 m/s),透明度较低,水体呈中性偏弱碱性(pH=6.63~9.67),易生成水华.各个采样点氮磷营养盐污染较为严重,且季节性差异明显,春夏季水质较好(Ⅱ类—Ⅲ类)、秋冬部分水体在某些时间段呈现Ⅴ类水.大莲湖示范区雨水径流浓度有明显的初期效应,各下垫面氮磷的平均浓度远高于地表水Ⅴ类标准,污染较为严重.

In this paper,we use hydrology and water quality survey data around Dalian Lake to assess the environmental status of the water and surface runoff pollution in the Dalian Lake demonstration area.The results show that the water quality of the Jinze water source can largely satisfy classⅢstandards for surface water;however,given seasonal differences for some indicators,the water quality of the Jinze water source fails to meet the standard on a consistent basis.The water body surrounding the Dalian Lake demonstration area is predominantly slow flow(flow rate:0-0.03 m/s),with low transparency and neutral or slightly alkaline water(pH=6.63-9.67);these conditions render the area susceptible to forming water bloom.Pollution from nitrogen and phosphorus nutrients at each sampling point was significant,and seasonal differences were noticeable;the water quality in spring and summer is generally better(classⅡ-Ⅲ),and some water bodies meet classⅤstandards in autumn and winter.The concentration of rainwater runoff in the Dalian Lake demonstration area has a noticeable initial effect.The average concentration of nitrogen and phosphorus in the underlying water is higher than the classⅤstandard for surface water,and the pollution is likewise more significant.