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引用本文:张晟,李崇明,吕平毓,高吉喜,高群杰,宋丹.三峡水库成库后水体中CODMn、BOD5空间变化.湖泊科学,2007,19(1):70-76. DOI:10.18307/2007.0111
ZHANG Sheng,LI Chongming,Lü Pingyu,GA0 Jixi,GA0 Qunjie,S0NG Dan.Spatial variation of BOD5 and CODMn in the Three Gorges Reservoir. J. Lake Sci.2007,19(1):70-76. DOI:10.18307/2007.0111
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三峡水库成库后水体中CODMn、BOD5空间变化
张晟1, 李崇明1, 吕平毓2, 高吉喜3, 高群杰1, 宋丹1
1.重庆市环境科学研究院, 重庆400020;2.长江上游水环境监测中心, 重庆400020;3.中国环境科学研究院, 北京100012
摘要:
根据2004年2、5、8月, 三峡水库成库后6个水平断面、4个垂直断面采样分析, 对水体水质参数、DO以及CODMn和BOD5的水平分布和垂直分布进行了研究.研究结果表明, 成库后BOD5达到国家地表水Ⅰ类标准, CODMn不同季节变化较大, 水质范围在Ⅱ-Ⅳ类标准.BOD5、CODMn变化范围分别在0.1-1.3 mg/L.1.8-6.3 mg/L, 受三峡水库成库的影响, 水平分布上, DO、CODMn、BOD5在成库区域低于上游区;CODMn含量丰水期>平水期>枯水期;BOD5浓度降低主要与污染物停留时间变长有关, CODMn主要是与泥沙沉积有关.垂直分布上, 污染物3个层次变化不显著, 未出现分层现象.枯水期、平水期、丰水期颗粒态含量占总CODMn范围分别为5.5%-27.3%, 9.1%-28.8%, 48.6%-78.3%.三峡水库对CODMn、BOD5有净化作用, 枯水期成库区域通量CODMn、BOD5比上游区降低44%、76%, 平水期降低13.5%, 32%, 丰水期降低31.8%、19.1%.各采样站点有机物通量和流量有显著的相关性.大宁河库湾受浮游藻类生长的影响, DO饱和率高于干流库区.
关键词:  三峡水库  CODMn  BOD5  空间变化
DOI:10.18307/2007.0111
分类号:
基金项目:重庆市自然科学基金(2004BB7075, 2005BB7239);中-意合作项目(三峡库区生态环境调查及评价)联合资助.
Spatial variation of BOD5 and CODMn in the Three Gorges Reservoir
ZHANG Sheng1, LI Chongming1, Lü Pingyu2, GA0 Jixi3, GA0 Qunjie1, S0NG Dan1
1.Chongqing Academy of Environmental Science, Chongqing 400020, P.R China;2.Water Environment Monitoring Center for Upper Yangtze River, Chongqing 400716, P.R China;3.Chinese Research Academy of Environment Science, Beijing 100012, P.R China
Abstract:
Through sampling and analysis of 6 horizontal stations and 4 vertical stations in the Three Gorges area, the spatial variation of water quality parameter, dissolved oxygen ( DO), biochemical oxygen demand ( BOD5 ) and permenganate index of oxygen demand ( CODM.) were revealed in Feb., May and Aug., 2004.Concentration of BOD5 were retained low level which preceded surface water standard I and CODMn changed from Ⅱ- Ⅳ in diverse season.The variation of BOD5 and CODMn ranged from 0.1- 1.3 mg/L and 1.8- 6.3 mg/L respectively.Horizontal concentration of DO, BOD5 and CODMn.in reservoir area were lower than upstream area.In flood season, coneentration of CODMn were higher than normal and dry season.In reservoir area, the lower concentration of BOD5 were due to long retension time and COD due to particulate deposition.The vertical variation of BOD5 and CODMn were not notable and organic pollutant were not layered.Particle CODMn rate in total CODMn in dry, normal and flood season ranged from 5.5%-27.3%, 9.1%-28.8% and 48.6%-78.3% respectively.Water quality was improved when passing through reservoir.Flux of CODMn and BOD5 decreased 44% and 76% in dry season, 13.5% and 32% in normal season, 31.8% and 19.1% in flood season respectively.There was significant correlation between organic pollutant load and water discharge.Because of algae growth, the saturated rate of DO in Daning river bay is higher than in the main stream of reservoir.
Key words:  Three Gorges Reservoir  CODMn  BOD5  spatial variation
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