摘要
根据太湖流域西部重要入太湖河道陈东港2021年ADCP流量测验数据和水质在线监测数据,分析了该河道流量、污染物质量浓度和通量的年内变化特征,比较了流量、水质数据采集频次对污染物通量计算结果的影响。结果表明:2021年陈东港年平均流量为73.66 m^(3)/s,年径流量为23.29亿m^(3),日均流量年内波动剧烈,峰值出现在7月,其变化过程受降水影响显著;COD_(Mn)和TP质量浓度的年内波动也较明显,全年累计通量分别为10357 t和352 t。基于固定式ADCP流量测验数据计算污染物通量较基于水文巡测数据的精度提升约39.5%,两者差异主要集中在6—8月。若要将两种污染物年累计通量的计算相对误差控制在5%以内,流量采集频次不宜低于2 d一次;若相对误差控制在10%以内,流量采集频次不宜低于10 d一次,在丰水期(6—9月)和枯水期(12—2月)需提升至2 d一次。与流量采集频次相比,两种污染物年累计通量对水质采集频次变化的敏感性相对较低,当水质采集频次从8 h一次减少到30 d一次时,相对误差仍在5%以内。
According to the discharge data measured by ADCP and water quality data acquired by online monitoring of the Chendong River in 2021,which is an important channel into the western Taihu Basin,the annual variation characteristics of discharge,mass concentration and influx of pollutant of the river were analyzed.Also,the effects of discharge and water quality sampling frequency on the calculation of pollutant influx were compared.The results show that the annual average discharge of the Chendong River was 73.66 m^(3)/s in 2021,and the annual runoff was 2.329 billion m^(3).The daily discharge fluctuated violently during 2021,with a peak in July,and its change process was significantly affected by precipitation.The mass concentration of COD_(Mn)and TP also fluctuated greatly during 2021,with the annual cumulative influx being 10357 t and 352 t,respectively.The accuracy of pollutant influx calculation based on fixed ADCP discharge measurement data was about 39.5%higher than that based on hydrological patrol survey data.The difference was mainly reflected from June to August.If it is necessary to control the relative error of the calculation of the annual cumulative influx of the two pollutants within 5%,the discharge sampling frequency should be at least 2 days.If the relative error needed to be controlled within 10%,the discharge sampling frequency should be at least 10 days.While during the wet season(from June to September)and the dry season(from December to February),the discharge sampling frequency should be increased to 2 days.Compared with the discharge sampling frequency,the annual cumulative influx of the two pollutants were relatively less sensitive to change of water quality sampling frequency.When the water quality sampling frequency was reduced from 8 hours to 30 days,the relative error was still within 5%.
作者
徐海波
吴金华
任小龙
顾炉华
李秋红
朱玲
XU Haibo;WU Jinhua;REN Xiaolong;GU Luhua;LI Qiuhong;ZHU Ling(Jiangsu Provincial Academy of Environmental Science,Nanjing 210003,China;Jiangsu Provincial Key Laboratory of Environmental Engineering,Nanjing 210003,China;Wuxi Branch of Jiangsu Province Hydrology and Water Resources Investigation Bureau,Wuxi 214031,China)
出处
《水资源保护》
EI
CAS
CSCD
北大核心
2023年第6期178-185,共8页
Water Resources Protection
基金
国家自然科学基金项目(42101056)
江苏省省属公益类科研院所自主科研经费资助项目(GYYS2021204)。
关键词
固定式ADCP
污染物通量
流量
水质
陈东港
太湖流域
fixed ADCP
pollutant influx
discharge
water quality
the Chendong River
Taihu Basin
