IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Interpretation and applicability of residence times in reservoirs
Interpretation and applicability of residence times in reservoirs
The residence time scale is widely applied in engineering, for example, it has been used to optimize reactors and to
predict eutrophication levels of water bodies. It has been used to define the hydraulic detention time, which is the ratio
between the volume and the outlet flow of the system. Although this simple approach is widely used, the method is
unable to identify dead zones within the system. Therefore, the present study aims to analyze, evaluate and propose
methods to estimate transport time scales (in literature called generically residence time) that are able to identify the
spatial variability of the transport of substances within a real system. In addition, this study aimed to identify potential
applications for transport time scales using the Vossoroca hydropower reservoir in Brazil as a case study. The transport
time scales were tested in a numerical experiment: a channel with a harbor. This analysis verified how bulk and local
scales behave in a non-uniform system. The second analysis compared qualitatively scales with the transport
phenomena and verified the ability to identify dead zones. Finally, the scales were applied to a real case and the links
between the transport time scales and water quality parameters were investigated. All local scales tested were able to
identify dead zones. Moreover, it was verified that the arrival time is related to the influence of the inflow and export time
indicates where system export elements quickly. The case study indicated the existence of a relationship between
transport time scales and water quality parameters, thus water quality information were extrapolated to regions without
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 19/08/2015
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