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Titre : | Suivi et modélisation de la flèche de galets au Hourdel, Baie de Somme. |
Auteurs : | Garance VIDIL ; Eleonore ROUSSEL |
Type de document : | Mémoire d'initiation à la recherche |
Année de publication : | 2021 |
Concepts : |
BAIE DE SOMME
MODELISATION NUMERIQUE |
Résumé : | Numerous pebbles present on the Picardy coastline at Hourdel have accumulated and form a spit that extends for nearly 16 km. This spit tends to close off the Somme Bay to the North-East. This protected area is threatened by these pebble strips which prevent the sea from entering the bay. The objective of this study is to evaluate the progress of this spit along the coastline using numerical modelling. Global Positioning System (GPS) measurements were taken in the study area using a drone. Thanks to these data and in addition to analyses dating from 1966 to the present day, this study presents the evolution of the spit on the Picardy coast. The problem is therefore the following: can we draw up a timetable for the evolution of the spit's pebble strips in order to anticipate its movements? Many studies have already been carried out in this area. Several mechanisms have been put in place to combat the closure of the bay for several decades. The responses show numerous techniques that are more or less effective due to the very fast progression of the coastline. Indeed, as the swell is significant on the Picardy coast, the coastline is constantly moving. These mechanisms are working well but are not sufficient. It is therefore important to understand and anticipate the movement of the pebbles to avoid the closing of the bay. Our study has shown that the cobble spit is indeed evolving rapidly towards the North-East and therefore tends to close the Somme Bay. |
Spécialité : | Géologie |
Numéro de promo : | 83 |
numéro MIR : | 922 |