Regensburg 2022 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 34: Fluid Physics: Turbulence and Convection
DY 34.6: Vortrag
Mittwoch, 7. September 2022, 17:00–17:15, H19
3D simulation of convection patterns in dry salt lakes — •Lucas Goehring1, Matthew Threadgold2, Cédric Beaume2, and Steve Tobias2 — 1Nottingham Trent University, Nottingham, UK — 2University of Leeds, Leeds, UK
Salt deserts are some of the most extreme and beautiful landscapes in the world–flat silver-white crystalline plains covered with bizarre and seemingly unnatural shapes. The most prominent feature of these fantastic landscapes is a characteristic tiling of polygons, formed by ridges in the salt-encrusted surface, and always a few meters across. Recently, a dynamical model has been proposed to explain their formation as the surface expression of buoyancy-driven convection happening in the wet salty soil beneath the desert surface. Here, we present a 3D numerical model of the salt lake problem, where a fluid-saturated porous medium is subject to a constant surface evaporation, mimicking the conditions of a desert with an underground aquifer near the surface. We look in turn at the initial instabilities expected in this system, and how they will evolve in time into a dynamical steady state. In this we focus on identifying the patterns that develop in the model, and exploring how the surface flux of salinity depends on the driving parameters.