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Typologie thermo-mictique : Application à une classification des lacs français

Abstract : Aquatic ecosystems undergo various local or regional anthropogenic pressures that managers try to understand and to mitigate their consequences. Nowadays these local and regional pressures interact with climate change. To better manage these interactions, managers should be familiar with the thermal behaviour of aquatic ecosystems. For lakes, Onema wants to set up a perennial temperature monitoring network for national water bodies as it is being done for rivers. However, all French lakes cannot be surveyed. As a consequence, lake subsampling, reflecting the national diversity of thermal behaviour (and especially the intensity and the frequency of the mixing events), has to be defined. Since temperature of a large amount of lakes have never been measured, it is necessary to estimate first the thermal behaviour diversity of all lakes. To do this, we used in this study the Lewis typology of mixing behaviour which is based on thermal characteristics of the water column of lakes. However, all lakes in France were not thermally monitored continuously and therefore, for some of them, no information on their thermodynamic function is available. This lack of temperature data imposes to use empirical models in order to estimate their thermal behaviour from morphometric and climate data. These empirical models are based on classical environmental variables such as maximum depth, surface area or air temperature, and allow the estimation of several physical variables necessary to classify water bodies according to the Lewis scheme. The relevance of using specific empirical models was verified using the few actual data available. Finally, a lake classification according to the Lewis typology is proposed.
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Submitted on : Friday, May 15, 2020 - 10:50:12 PM
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  • HAL Id : hal-02597637, version 1
  • IRSTEA : PUB00036643



C. Rondel, P.A. Danis, Martin Daufresne. Typologie thermo-mictique : Application à une classification des lacs français. irstea. 2012, pp.62. ⟨hal-02597637⟩



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