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引用本文:何锡君,孙英军,王贝,姚岳来,陈革强,吴珍梅,王冬.浙江省出入太湖河道水量水质及污染物通量变化(2007-2019年).湖泊科学,2021,33(5):1425-1435. DOI:10.18307/2021.0527
He Xijun,Sun Yingjun,Wang Bei,Yao Yuelai,Chen Geqiang,Wu Zhenmei,Wang Dong.Variation of water quantity, quality and pollutant flux of inflow and outflow rivers to Lake Taihu in Zhejiang Province, 2007-2019. J. Lake Sci.2021,33(5):1425-1435. DOI:10.18307/2021.0527
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浙江省出入太湖河道水量水质及污染物通量变化(2007-2019年)
何锡君1, 孙英军1,2, 王贝1, 姚岳来1, 陈革强1, 吴珍梅1, 王冬2
1.浙江省水文管理中心, 杭州 310009;2.浙江水文新技术开发经营公司, 杭州 310009
摘要:
自2007年太湖无锡水危机事件后,太湖流域内各项水污染防治工作进入快车道,近年来浙江省持续开展水环境治理,针对不同污染源进行分类施策、精准治理,整体水环境质量得到了显著改善.本文根据2007-2019年浙江省环太湖水文巡测资料及主要出入太湖河道水质监测成果,全面分析了出入湖河道的水量、水质及污染物通量的时空变化趋势.结果表明,2007-2019年浙江省年均入湖水量为27.39亿m3,年均出湖水量为26.42亿m3,环湖河道进出水量在2007-2014年以出湖为主,2015-2019年以入湖为主,2015-2019年入湖水量增加受该时段地区降水量较丰的影响.2007-2019年浙江省环湖河道CODMn、NH3-N和TP浓度呈明显下降趋势,TN浓度有所下降,除TN仍处于Ⅴ~劣Ⅴ类水外,其余指标已处于Ⅱ~Ⅲ类水标准,当前环湖河道的CODMn和NH3-N指标已达到《太湖流域水环境综合治理总体方案(2013年修编)》提出的目标值,但TN和TP浓度仍存在较大差距.浙江省环湖河道年平均CODMn、NH3-N、TP和TN入湖通量分别为1.12万、0.18万、0.03万和0.90万t,出湖通量分别为1.13万、0.10万、0.03万和0.62万t,环湖河道除CODMn以净出湖通量为主外,其余指标均以净入湖通量为主,存在一定入湖滞留,其中水量是影响入湖通量的关键因子.
关键词:  污染物通量  水量  水质  浙江省  太湖
DOI:10.18307/2021.0527
分类号:
基金项目:
Variation of water quantity, quality and pollutant flux of inflow and outflow rivers to Lake Taihu in Zhejiang Province, 2007-2019
He Xijun1, Sun Yingjun1,2, Wang Bei1, Yao Yuelai1, Chen Geqiang1, Wu Zhenmei1, Wang Dong2
1.Zhejiang Hydrological Management Center, Hangzhou 310009, P. R. China;2.Zhejiang Hydrographic Technology Development and Operation Company, Hangzhou 310009, P. R. China
Abstract:
Since the Wuxi water crisis in Lake Taihu in 2007, the prevention and control of water pollution in Taihu Basin has drawn attention from the government. In recent years, Zhejiang Province has continued to take measures, i.e. classifying different sources of pollution, treating accurately sewage waste water, to improve the overall water environment quality. Based on the hydrological survey data of Lake Taihu in Zhejiang Province from 2007 to 2019 and the water quality monitoring results of the main inflow and outflow rivers of Lake Taihu, this paper comprehensively analyzes the temporal and spatial variation trend of water quantity, water quality and pollutant flux in and out of Lake Taihu. The results show that the average annual inflow and outflow of Lake Taihu in Zhejiang Province are 2.739 billion m3 and 2.642 billion m3, respectively. During 2007-2014, the net flow from the rivers are positive from 2007 to 2014, and negative from 2015 to 2019. The main reason for the increase of inflow from 2015 to 2019 is due to the influence of abundant precipitation. From 2007 to 2019, the concentrations of CODMn, NH3-N and TP in the rivers around the lake in Zhejiang Province showed a significant downward trend, while the concentration of TN decreased. Except TN was still in the class V-inferior to class V water, the other indicators were in the class Ⅱ-Ⅲ according to the national water quality standard. At present, the CODMn and NH3-N concentrations of the rivers around the lake have reached the target proposed in the overall plan for comprehensive water environment management of Taihu Basin (revised in 2013), while some water quality indexes of the rivers around the lake remains to be ameliorated, such as TN and TP concentrations. The annual average influxes of CODMn, NH3-N, TP and TN are 11200, 1800, 300 and 9000 t, respectively, and the outfluxes of them are 11300, 1000, 300 and 6200 t, respectively. The net fluxes of CODMn are positive (outflow>inflow), while the other indexes show negative (inflow>outflow) in most years. The water quantity is the key factor affecting the flux into the lake.
Key words:  Pollutant fluxes  water quantity  water quality  Zhejiang Province  Lake Taihu
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