Temperature Dynamics Investigation At Small And Shallow Lakes Using Hydrodynamic Model

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Abstract

A three-dimensional time-dependent hydrodynamic and heat transport model of Lake Binaba, a shallow and small dam reservoir in Ghana, emphasizing the simulation of dynamics and thermal structure has been developed. Most numerical studies of temperature dynamics in reservoirs are based on one- or two-dimensional models. These models are not applicable for reservoirs characterized with complex flow pattern and unsteady heat exchange between the atmosphere and water surface. Continuity, momentum and temperature transport equations have been solved. Proper assignment of boundary conditions, especially surface heat fluxes, has been found crucial in simulating the lake’s hydrothermal dynamics. This model is based on the Reynolds Average Navier-Stokes equations, using a Boussinesq approach, with a standard k − ε turbulence closure to solve the flow field. The thermal model includes a heat source term, which takes into account the short wave radiation and also heat convection at the free surface, which is function of air temperatures, wind velocity and stability conditions of atmospheric boundary layer over the water surface. The governing equations of the model have been solved by OpenFOAM; an open source, freely available CFD toolbox. As its core, OpenFOAM has a set of efficient C++ modules that are used to build solvers. It uses collocated, polyhedral numerics that can be applied on unstructured meshes and can be easily extended to run in parallel. A new solver has been developed to solve the hydrothermal model of lake. The simulated temperature was compared against a 15 days field data set. Simulated and measured temperature profiles in the probe locations show reasonable agreement. The model might be able to compute total heat storage of water bodies to estimate evaporation from water surface. INTRODUCTION Inalnd
Original languageEnglish
Title of host publicationProceedings of the HIC 2014 - 11th international conference on hydroinformatics
EditorsM Piasecki
Pages2807-2814
Publication statusPublished - 2014
Event11th International Conference on Hydroinformatics - New York, United States
Duration: 17 Aug 201421 Aug 2014
Conference number: 11
http://academicworks.cuny.edu/cc_conf_hic/

Publication series

Name
Publishers.n.

Conference

Conference11th International Conference on Hydroinformatics
Abbreviated titleHIC 2014
CountryUnited States
CityNew York
Period17/08/1421/08/14
Internet address

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