太浦河锑浓度异常预警指标研究

Analysis on Early-warning Indexes for Antimony Concentration Anomaly in Taipu River

太浦河作为太湖流域的重要供水通道,长期以来重点都是关注水源地氨氮指标浓度,但2014年以来多次发生锑浓度异常事件,为太浦河水源地供水安全拉响了警报。根据近几年实践,在太浦河两岸地区企业锑污染物排放严格控制的情况下,锑浓度异常主要与地区降雨强度密切相关。研究结果表明,太浦河锑浓度异常预警指标设定为杭嘉湖区两日累计降雨量达到或超过50mm以上,且太浦闸受强降雨影响关闸时,太浦河出现锑浓度异常可能性较大。在此基础上研究了有效应对锑浓度异常时太浦闸的供水流量。该成果为预防太浦河锑浓度出现异常情况,保障太浦河下游地区供水安全提供了决策支撑。

The Taipu River has along been focused on its ammonia nitrogen concentration as it is an important water supply channel in Taihu Lake basin.Alarms were raised over the safety of the water supply due to the incidents which antimony concentration anomaly frequently occurred during 2014-2018.According to the practice in recent years,and under the strict control of antimony discharge standard,the antimony concentration anomaly in Taipu River is closely connected with the regional rainfall intensity.The results show that the early-warning of antimony concentration anomaly is indicated when 2-day cumulative precipitation reach or exceed 50 mm in Hangjiahu area,and the probability of antimony concentration anomaly is increasing when the Taipu sluice is closed by the heavy rainfall.Besides,this paper provided effective methods on antimony concentration anomaly for water supply flow at Taipu sluice.