In dry years, due to reduction in inflows caused by less precipitation, water will stay in the reservoir for a longer time to meet a minimum requirement of storage, exhibiting the characteristic of lakes with relatively longer residence time. The water depths and widths of channel reservoirs are often far less than their respective lengths, and their hydrodynamic conditions are complex and highly affected by the inflows. 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.Ĭhannel reservoirs, which are different from normal reservoirs, have the characteristics of both rivers and lakes. The spatial distribution of water ages in the tributaries and the reservoir were mainly affected by precipitation. The highest water ages at the main tributary were >70 d, >100 d, and >200 d, respectively. 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 results showed that the water age in CTR varied tremendously under different weather conditions. 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 hyper-eutrophic Changtan Reservoir (CTR) in Southern China was investigated. 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. 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.
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