Effect of cascade dam construction on the spatio-temporal variations of water quality in Heihe River

doi:10.18307/2020.0525

	Effect of cascade dam construction on the spatio-temporal variations of water quality in Heihe River
	Wang, Yu 2,3; Lu, Shiguo 2; Feng, Qi 3; Liu, Wei 3; Liu, Juanjuan 2; Liu, Kaiqing 1; Zuo, Yifeng 2
刊名	Hupo Kexue/Journal of Lake Sciences
	2020-09-06
卷号	32 期号:5 页码:1539-1551
关键词	Ammonia Biochemical oxygen demand Dams Deterioration Dissolved oxygen Hydroelectric power plants Multivariant analysis Nitrogen Reservoirs (water) River pollution Sampling Water quality Electrical conductivity Environmental influences Hydrodynamic conditions Hydrological condition Multivariate statistical method Spatio-temporal variation Spatiotemporal characteristics Water quality deterioration
ISSN号	10035427
DOI	10.18307/2020.0525
英文摘要	Construction of casade dams in Heihe River had a certain influence on the river water quality. We divided the water into upstream and downstream reaches of dam and natural reaches. To explore the impact of casade dams on the water quality, multivariate statistical methods were used to analyze the spatio-temporal characteristics of water quality based on 24 different sampling sites from december 2017 to august 2018. The results showed that the main impact factors on water quality in Heihe River were water temperature (WT), pH, dissolved oxygen (DO), electrical conductivity (EC), total nitrogen (TN), total phosphorus (TP) and biochemical oxygen demand (BOD5). WT, EC, BOD5, chemical oxygen demand (CODMn) and TN varied signnificantly on the spatial scales. The water quality of the upstream reaches of dam were greatly affected by BOD5 and CODMn, while WT, EC and TN were the key drivers for the natural reaches and less environmental influence on the downstream water quality. In temporal terms, WT, EC, BOD5 and ammonia nitrogen excerted the greatest effects on the water quality, with most of the water quality factors changed obviously in non flood seasons. Factors such as temperature, rainfall, hydrological conditions and the joint operation mode of cascade reservoirs were the main factors affecting the seasonality of water quality in the region. The spatial differences were mainly influenced by the exogenous pollutants discharging in Qilian and Zhangye areas, and the influence of sediment retention and accumulation on the environment of dam construction due to the change of hydrodynamic conditions. The results show that exogenous pollution sources were still the main factors, followed by the cascade dam construction as the indirect factors, for the water quality deterioration. Therefore, controlling the exogenous pollution sources caused by human activities in the region, and implementing a reasonable reservoir operation mode according to the seasonal variation of pollutants were the key to improve the river water quality along with the cascade hydropower development. © 2020 by Journal of Lake Sciences.
语种	中文
出版者	Science Press
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/151157]
专题	能源与动力工程学院
作者单位	1.Taolaihe Basin Water Resourse Authority of Gansu Province, Jiuquan; 735000, China 2.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 3.Key Laboratory of Ecohydrology of Inland River Basin, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou; 730000, China;
推荐引用方式 GB/T 7714	Wang, Yu,Lu, Shiguo,Feng, Qi,et al. Effect of cascade dam construction on the spatio-temporal variations of water quality in Heihe River[J]. Hupo Kexue/Journal of Lake Sciences,2020,32(5):1539-1551.
APA	Wang, Yu.,Lu, Shiguo.,Feng, Qi.,Liu, Wei.,Liu, Juanjuan.,...&Zuo, Yifeng.(2020).Effect of cascade dam construction on the spatio-temporal variations of water quality in Heihe River.Hupo Kexue/Journal of Lake Sciences,32(5),1539-1551.
MLA	Wang, Yu,et al."Effect of cascade dam construction on the spatio-temporal variations of water quality in Heihe River".Hupo Kexue/Journal of Lake Sciences 32.5(2020):1539-1551.