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Télédétection radar SAR et photogrammétrie : application à la géographie limnologique avec l'exemple de l'étude du ravinement littoral au lac de Rambla de Algericas (Murcia, Espagne)

Abstract : The Rambla de Algeciras lake in Murcia is a reservoir of potable water, and also contributes to thereduction of flooding. With a semi-arid climate and a very friable nature of the geological formations atthe lakeshore level, the emergence and development of bank gullies is favored and poses a major problemof siltation of the lake. The objective of this thfesis work is to follow the sedimentary contributions of the lake shore gullies, using aerial photos, LiDAR data and Radar SAR images. In 2018, three gullies ofdifferent types were modelled in high resolution using UAV photogrammetry to obtain their lowtopographic change. The LiDAR point clouds of the PNOA project were thus used to study the variabilityand annual sedimentary dynamics on a larger spatial scale covering all the lake banks. This then helpsguide lake managers to implement strategies that take into account the contributions of lake shore gulliesthat are generally underestimated in lake water budgets.Since all areas affected by the gully phenomenon are confronted with a lack of data on sediment budgets,we proposed the use of the SAR interferometry technique (InSAR) on the slopes of eroded gullies todetermine with millimetric precision the slight topographic changes on the layover areas.The analysis of the gully trigger effect on changes in coherence on the layover areas showed that thesignal on the layover areas is often sufficiently coherent to produce a theoretically usable InSAR phase.This phase has been exploited to determine the erosion rate of gully slopes after modifying someparameters related to the phase of the radar SAR signal on the folded slopes. The application of thismulti-temporal InSAR technique with Sentinel-1 data on layover areas and the comparison of theiraccuracy with UAV data demonstrate the relevance of SAR data for monitoring the sediment budget onlayover areas in a semi-arid climate. In general, this thesis contributes to improve the regular monitoringof gullies in semi-arid zones that are difficult to access with very high accuracy.
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https://tel.archives-ouvertes.fr/tel-03097388
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Submitted on : Tuesday, January 5, 2021 - 12:29:09 PM
Last modification on : Monday, February 22, 2021 - 2:50:03 PM

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2020LIMO0036.pdf
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  • HAL Id : tel-03097388, version 1

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Radouane Hout. Télédétection radar SAR et photogrammétrie : application à la géographie limnologique avec l'exemple de l'étude du ravinement littoral au lac de Rambla de Algericas (Murcia, Espagne). Géographie. Université de Limoges, 2020. Français. ⟨NNT : 2020LIMO0036⟩. ⟨tel-03097388⟩

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