Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Study of dune fields by remote sensing
Submission Author:
Layse Barbosa Pôrto , SP , Brazil
Co-Authors:
Layse Barbosa Pôrto, Erick de Moraes Franklin
Presenter: Willian Righi Assis
doi://10.26678/ABCM.ENCIT2022.CIT22-0070
Abstract
Sand dunes can be seen as a protection of contiguous areas against erosion processes, acting as natural barriers that prevent the advance of the sea and the entry of salt water into the groundwater. They are the result of wind processes and have two basic sides: windward side and lee face. Windward is the larger side that suffers from erosion and is located completely exposed to the wind, while the lee face is opposite to that side and protected from the direct wind. Dunes usually appear in places with available sand, being found on beaches, in deserts, and even on Mars, where images of that planet show that dunes can be found ubiquitously over its surface. The dunes have different morphologies that vary according to the amount of sediment, the vegetation cover and the constancy and variation of the wind. The dune fields have been undergoing natural changes caused by complex processes, of which wind action is largely responsible for the movement of the dunes. One of the consequences of the expansion of dune fields is the occurrence of desertification, a concern for populations living in arid and semi-arid areas. This work aims to describe the morphological changes that occurred in some of these dune fields in order to better understand the dynamics of dune systems and the parameters that control their development, besides showing the morphological variations of the dunes and the factors that influence such modifications. For this, geological mapping is used through the application of remote sensing to monitor the interactions occurring between dunes. Using a multitemporal analysis, a series of satellite images of certain places that present dune fields were obtained, where these images were analyzed and the data were compared with laboratorial information. It is possible to observe differences in the morphologies and understand how the studied fields reached the present configuration.
Keywords
Dunes, Remote Sensing, Geomorphology, Dune Dynamics
