Seasonal and Long‐Term Variations of Dissolved Solids in Lakes and Reservoirs
Publication: Journal of Environmental Engineering
Volume 115, Issue 6
Abstract
The seasonal and long‐term variations of dissolved solids in lakes and reservoirs are analyzed in accordance with the hydrologic‐ and mass‐balance equations. The volume and surface area are expressed as power functions of depth that yield analytical solutions for the long‐term analysis. The equation defining the water elevation and volume may be approximated by exponential functions that simplify the solution of the mass‐balance equation of the dissolved solids. For the intermediate and seasonal time scales, periodic and exponential functions define the hydrologic components, providing the forcing functions for the dissolved solids equations. For both cases, an exponential residence time transforms the mass‐balance equation, leading to analytical solutions. Given the mass and volume, the concentration follows. The temporal variations of dissolved solids, calculated by the associated mass and volumetric equations, are compared to the observed change in salinity in lakes and reservoirs of various geophysical and hydrological characteristics.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 115 • Issue 6 • December 1989
Pages: 1213 - 1234
Copyright
Copyright © 1989 ASCE.
History
Published online: Dec 1, 1989
Published in print: Dec 1989
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