摘要
根据2018—2019年南湖水系的现场调查结果,分析其水体透明度(SD)的季节变化、空间分布,探讨SD的影响因素及沉水植物恢复所需水体SD目标值。结果表明,南湖水体SD为10.0~46.0 cm,均值为24.8 cm,显著低于国内部分湖泊,空间上SD低值主要集中在入湖河口与航道附近,时间上在5月、9月和10月较低;南湖周边水体的SD为8.0~71.0 cm,均值为27.6 cm,低值主要集中在外环河网西部及北部的河口交叉处。相关性分析表明,水体SD与无机悬浮物(ISS)和有色溶解性有机物(CDOM)在254 nm处的吸收系数均呈显著相关,相关系数(R2)分别为0.68和0.34,其中ISS对SD的影响更大。结合水下地形和光补偿深度,确定南湖水体SD恢复初期目标值为80~100 cm;提高南湖水体SD应从减少水体悬浮物浓度和控制DOM方面入手。
The seasonal variation and spatial distribution of water transparency(SD)in Nanhu Lake were analyzed according to the data of field survey from 2018 to 2019,and the influencing factors and the target value required by submerged plants of SD were explored.The results indicated that SD of Nanhu Lake was between 10.0 cm to 46.0 cm,with an average value of 24.8 cm,which was significantly lower than some lakes in China.The low SD existed near the estuary into Nanhu Lake and channel,and Nanhu Lake had lower SD in May,September and October.SD of the surrounding river network ranged from 8.0 to 71.0 cm,with an average value of 27.6 cm,and the low values mainly existed in the western part of the outer river network and the northern estuary.Correlation analysis showed that SD was significantly correlated with inorganic suspended solids(ISS)and absorption coefficient of chromophoric dissolved organic matter at 254 nm,with the correlation coefficient(R2)of 0.68 and 0.34,respectively,and ISS had the higher influence on SD.Combining with the underwater terrain and the light compensation depth,SD restoration value in the initial stage of Nanhu Lake was determined by 80 to 100 cm.Reducing the concentrations of SS and DOM should be conducted to improve SD of Nanhu Lake.
作者
陈俊伊
王书航
郑朔方
姜霞
包文旗
CHEN Junyi;WANG Shuhang;ZHENG Shuofang;JIANG Xia;BAO Wenqi(State Environmental Protection Key Laboratory for Lake Pollution Control,Chinese Research Academy of Environmental Sciences;National Engineering Laboratory for Lake Pollution Control and Ecological Restoration,Chinese Research Academy of Environmental Sciences)
出处
《环境工程技术学报》
CAS
2020年第6期897-904,共8页
Journal of Environmental Engineering Technology
基金
国家水体污染控制与治理科技重大专项(2017ZX07206-003)。
关键词
南湖
透明度(SD)
时空分布
透明度目标值
悬浮物
Nanhu Lake
transparency(SD)
spatial and temporal distribution
transparency target value
suspended solids
