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Open AccessArticle

Water Age Responses to Weather Conditions in a Hyper-Eutrophic Channel Reservoir in Southern China

Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
Zhejiang Institute of Hydraulics & Estuary, Hangzhou 310020, China
Fujian Provincial Investigation, Design & Research Institute of Water Conservancy & Hydropower, Fuzhou 350001, China
College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
Desert Research Institution, Las Vegas, NV 89119, USA
Changjiang River Scientific Research Institute, Wuhan 430010, China
Water Resources Service Center of Jiangsu Province, Nanjing 210098, China
Division of Hydrologic Sciences, Desert Research Institute, Las Vegas, NV 89119, USA
Author to whom correspondence should be addressed.
Academic Editor: Y. Jun Xu
Water 2016, 8(9), 372;
Received: 28 June 2016 / Revised: 8 August 2016 / Accepted: 19 August 2016 / Published: 30 August 2016
(This article belongs to the Special Issue Tackling Complex Water Problems in China under Changing Environment)
Channel reservoirs have the characteristics of both rivers and lakes, in which hydrodynamic conditions and the factors affecting the eutrophication process are complex and highly affected by weather conditions. Water age at any location in the reservoir is used as an indicator for describing the spatial and temporal variations of water exchange and nutrient transport. The hyper-eutrophic Changtan Reservoir (CTR) in Southern China was investigated. Three weather conditions including wet, normal, and dry years were considered for assessing the response of water age by using the coupled watershed model Soil Water Assessment Tool (SWAT) and the three-dimensional hydrodynamic model Environmental Fluid Hydrodynamic Code (EFDC). The results showed that the water age in CTR varied tremendously under different weather conditions. The averaged water ages at the downstream of CTR were 3 d, 60 d, and 110 d, respectively in the three typical wet, normal, and dry years. The highest water ages at the main tributary were >70 d, >100 d, and >200 d, respectively. The spatial distribution of water ages in the tributaries and the reservoir were mainly affected by precipitation. This paper provides useful information on water exchange and transport pathways in channel reservoir, which will be helpful in understanding nutrient dynamics for controlling algal blooms. View Full-Text
Keywords: water age; weather conditions; EFDC; SWAT; channel reservoir water age; weather conditions; EFDC; SWAT; channel reservoir
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Du, W.; Li, Y.; Hua, L.; Wang, C.; Wang, P.; Wang, J.; Wang, Y.; Chen, L.; Bofah Buoh, R.; Jepkirui, M.; Pan, B.; Jiang, Y.; Acharya, K. Water Age Responses to Weather Conditions in a Hyper-Eutrophic Channel Reservoir in Southern China. Water 2016, 8, 372.

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