TITLE:
Evaluation of Water Losses by Evaporation in the Nakanbe Basin
AUTHORS:
Bayala Alfred, Kabre Sayouba, Yonli Hamma Fabien, Chesneau Xavier, Thierry Sikoudouin Maurice Ky, Zeghmati Belkacem, Kieno P. Florent, Kam Sié
KEYWORDS:
Numerical Study, Evaporation, Meteorological Data, Natural Convection, Basins, Dams
JOURNAL NAME:
Atmospheric and Climate Sciences,
Vol.14 No.1,
December
25,
2023
ABSTRACT: A numerical approach to heat and mass transfer in a
large water reservoir is presented. This water reservoir is likened to a
parallelepiped reservoir whose vertical and lower walls are adiabatic and
impermeable. The equations that govern natural convection in water are solved
by the finite volume method and Thomas’salgorithm. The adequacy between the
velocity and pressure fields is ensured by the SIMPLE algorithm. We are going
to evaluate the water losses by evaporation from three dams in the Nakanbé
basin in Burkina Faso for a period of thirty years, that is to say from January
1, 1991, to March 15, 2020. The three dams
have a rate of evaporation greater than 40% of the volume of water stored.
Indeed the rate of evaporation in each dam increases with the water filling
rate in the reservoir: we have observed the following results for each dam in
the Nakanbé basin; for the date of 02/27/1988 to 03/13/2020., the Loumbila dam
received a total volume of stored water of 22.02 Mm3 and 10.57 Mm3 as the total volume of water evaporated at the same date. At the Ouaga dam (2 + 3), it stored a water volume of 4.06 Mm3 and evaporated 2.03 Mm3 of its storage volume from 01/01/1988 to
05/07/2016. Finally, with regard to the Bagré dam, it stored 745.16 Mm3 of water and 365.13 Mm3 as the volume of water evaporated from
01/01/1993 to 03/31/2020.