Download PPNW 2017 Lake indicators Assessment v 2 (rodolfo) 27fev17

Article Abstract PPNW 2017
Assessments of lake indicators through a comparison between tropical and
subtropical shallow lakes
Amorim, Lais; Martins J.R.S1, Vinçon-Leite, B2.; Lemaire, B.J..3
Lake indicators such as Lake number, Schimidt Stability, Wedderburn number and others has
been frequently used to evaluate and predict waterbody’s stratification behavior due to
meteorological and climate conditions. Small and shallow lakes are particularly affected in
terms of their water quality by onset and mixing episodes related to energy incidence and
winds. High resolution measurements of water column temperature and atmospheric variables
like air temperature, radiation, precipitation and wind components can be employed to
characterize and predict dangerous events that affect aquatic life, water supply systems
operations, recreation and others water uses. The aim of this article is to assess computed lake
indicators along onset and mixing events in shallow lakes and correlate them with main
atmospheric driving forces.
Two lakes in two different climate regions were considered: Lake Créteil, situated in Paris
surroundings, France, and Hedberg Reservoir, located 60 km from the City of Sao Paulo,
Brazil. Both water bodies have same characteristics in terms of water volume, depth and
surface and were monitored along the year 2016 using high resolution temperature gages and
meteorological variable instruments. Lake indicators were computed for specific events using
Lake Analyzer (Read et al, 2002) and the results were compared and to the literature.
The assessments show the Maximum Schimidt Stability number to have the same order of
magnitude for both lakes, as well as Lake number. Results taken from the tropical lake present
a larger range of values, probably due to the higher number of episodes observed.
1
Hydraulic & Environmental Eng. Dept. School of Engineering, University of Sao Paulo, Brazil, corresponding
authors
2
LEESU, Ecole des Ponts ParisTech
3
LEESU, École des Ponts Paristech, AgroParisTech
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Article Abstract PPNW 2017
When the results were compared with the Ambrosetti (2002) study, that considered the
bottom elevation (Zmax) and the Maximum Schimidt Stability number relation for several
Italian lakes, it can be shown that the studied lakes are positioned in the begging of the curve,
following the tendency for shallow lakes.
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