Model for a dune field with exposed water table
Marco Cesar M. de M. Luna, Eric J. R. Parteli, Hans J. Herrmann

TL;DR
This paper presents a model for aeolian dune formation influenced by oscillating water tables, explaining the morphology and size of dunes in environments like Lene3 Maranhenses with seasonal groundwater fluctuations.
Contribution
It introduces a quantitative model linking water table oscillation parameters to dune morphology, advancing understanding of coastal dune field evolution with seasonal groundwater changes.
Findings
Dune morphology depends on water table oscillation period and height.
Long water table cycles produce chain-like dune formations with interdune ponds.
Model accurately reproduces dune size and morphology at Lene3 Maranhenses.
Abstract
Aeolian transport in coastal areas can be significantly affected by the presence of an exposed water table. In some dune fields, such as in Len\c{c}\'ois Maranhenses, northeastern Brazil, the water table oscillates in response to seasonal changes of rainfall and rates of evapotranspiration, rising above the ground during the wet season and sinking below in the dry period. A quantitative understanding of dune mobility in an environment with varying groundwater level is essential for coastal management as well as for the study of long-term evolution of many dune fields. Here we apply a model for aeolian dunes to study the genesis of coastal dune fields in presence of an oscillating water table. We find that the morphology of the field depends on the time cycle, , of the water table and the maximum height, , of its oscillation. Our calculations show that…
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