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The Residence Time of the Water in Lake MAGGIORE. Through an Eulerian-Lagrangian Approach
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Author(s): Leonardo Castellano (Matec Modelli Matematici, Italy), Nicoletta Sala (Università della Svizzera Italiana, Switzerland), Angelo Rolla (CNR – Institute for Ecosystem Study, Italy)and Walter Ambrosetti (CNR – Institute for Ecosystem Study, Italy)
Copyright: 2013
Pages: 17
Source title:
Complexity Science, Living Systems, and Reflexing Interfaces: New Models and Perspectives
Source Author(s)/Editor(s): Franco Orsucci (University College London, UK & Institute for Complexity Studies, Italy)and Nicoletta Sala (University of Lugano, Switzerland)
DOI: 10.4018/978-1-4666-2077-3.ch011
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Abstract
This chapter describes a study designed to evaluate the spectrum of the residence time of the water at different depths of a deep lake, and to examine the mechanisms governing the seasonal cycle of thermal stratification and destratification, with the ultimate aim of assessing the actual exchange time of the lake water. The study was performed on Lake Maggiore (depth 370m) using a multidimensional mathematical model and computer codes for the heat and mass transfer in very large natural water bodies. A 3D Eulerian time-dependent CFD (Computational Fluid Dynamics) code was applied under real conditions, taking into account the effects of the monthly mean values of the mass flow rates and temperatures of all the tributaries, mass flow rate of the Ticino effluent and meteorological, hydrological, and limnological parameters available from the rich data-base of the CNR-ISE (Pallanza). The velocity distributions from these simulations were used to compute the paths of a large number of massless markers with different initial positions and evaluate their residence times in the lake.
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