摘要
为探究梯级水库建设下澜沧江流域电导率和浊度变化规律,以澜沧江干流和梯级水库作为研究对象,在2016年10月、2017年2月、2017年6月、2018年1月进行水质参数监测.通过对澜沧江流域电导率、浊度等指标进行监测分析,以表征梯级水库建设对澜沧江水环境的累积效应.由Pearson相关性分析结果表明,电导率与浊度相关性显著.空间上,自上游至下游,自然河段电导率沿程逐步下降,水库河段电导率缓慢降低,其中在大型水库坝前坝后波动较大;浊度自上游至下游先上升后下降,自然河流段先增高后降低,水库河段浊度变化范围较小.时间上,平水期电导率因汛后富集作用整体上高于其它时期,自然河段丰水期电导率最低,水库河段变化范围与趋势几乎一致;自然河段丰水期浊度显著高于其他时期,水库河段在不同时期沿程总体在90 FNU以下.梯级水库建设使流速减缓,电导率和浊度累积效应明显.小湾水库不同时期浊度垂向变幅在10 FNU以内,电导率因水体滞留时间增大随水温出现分层现象;功果桥水库、苗尾水库不同时期水体滞留时间短,浊度垂向变幅较小湾水库大,垂向掺混使电导率变幅较小.
In order to explore the impact of cascade reservoir construction on the ecological environment of the Lancang River Basin,the main parameters of the Lancang River and the cascade reservoirs were used to conduct water quality parameter monitoring in October 2016,February 2017,June 2017,and January 2018.By monitoring and analyzing of the conductivity and turbidity of the Lancang River Basin,the cumulative effect of the cascade reservoir construction on the Lancang River water environment was characterized.The results show that:In space,from upstream to downstream,the electrical conductivity of natural river decreased gradually,and the electrical conductivity of reservoir river decreased slowly,and the fluctuation is large in front and back of large reservoir dam.Turbidity increased first and then decreased from upstream to downstream,increased first and then decreased in natural river section,and the range of turbidity change in reservoir section was small.In time,the conductivity of the flat water period was higher than that of other periods,and the conductivity of the natural river section was the lowest.The range of the reservoir section was almost the same as the trend;the natural river section was turbid during the wet season.The degree was significantly higher than other periods,and the difference between the reservoir sections in different periods was gradually reduced.The construction of cascade reservoirs slowed down the flow rate,and the cumulative effect of conductivity and turbidity was obvious.The vertical variation of turbidity in Xiaowan Reservoir was within 10 FNU,and the conductivity was stratified with water temperature due to the increase of water retention time.The water retention time was short in different periods of Gongguoqiao Reservoir and Miaowei Reservoir,and the turbidity was vertical.The vertical variation of turbidity is larger than that of Bay Reservoir,and the vertical blending makes the conductivity less variable.
作者
聂小芬
杨正健
王从锋
许尤
胡子龙
马骏
纪道斌
NIE Xiaofen;YANG Zhengjian;WANG Congfeng;XU You;HU Zilong;MA Jun;JI Daobin(College of Hydraulic&Environmental Engineering,China Three Gorges Univ.,Yichang 443002,China;Collaborative Innovation Center for Geo-hazards&Eco-Environment in Three Gorges Area,Yichang 443002,China;Hubei Key Laboratory of Ecological Restoration of River-lakes&Algal Utilization,Hubei Univ.of Technology,Wuhan 430068,China)
出处
《三峡大学学报（自然科学版）》
CAS
2021年第1期18-24,共7页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金重大项目(91647207)
三峡大学学位论文培优基金项目资助(2019SSPY012)。
关键词
澜沧江
梯级水库
电导率
浊度
时空分布
Lancang river
cascade reservoir
conductivity
turbidity
space-time distribution
