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Open AccessArticle

Mathematical Reconstruction of Eroded Beach Ridges at the Ombrone River Delta

by Irene Mammì 1,2,*, Lorenzo Rossi 1,2 and Enzo Pranzini 1,3
1
GNRAC—Gruppo Nazionale per la Ricerca in Ambiente Costiero, Corso Europa, 26-16132 Genova, Italy
2
GeoCoste s.n.c., Via Corsi, 19-50141 Florence, Italy
3
Department of Earth Science, University of Florence, Via Micheli, 4-50121 Florence, Italy
*
Author to whom correspondence should be addressed.
Water 2019, 11(11), 2281; https://doi.org/10.3390/w11112281
Received: 10 September 2019 / Revised: 25 October 2019 / Accepted: 28 October 2019 / Published: 31 October 2019
(This article belongs to the Special Issue Coastal Dynamic and Evolution)
Several remotely sensed images, acquired by different sensors on satellite, airplane, and drone, were used to trace the beach ridges pattern present on the delta of the River Ombrone. A more detailed map of these morphologies, than those present in the literature, was obtained, especially at the delta apex, where beach ridges elevation in minor. Beach ridges crests, highlighted through image enhancement using ENVI 4.5 and a DTM based on LiDAR data, were then processed with ArcGIS 9.3 software. Starting from this map, a method to reconstruct beach ridges segments deleted by the transformations of the territory is proposed in this paper. The best crest-lines fitting functions were calculated through interpolation of their points with Curve Expert software, and further extrapolated to reconstruct the ridges morphology where human activity, riverbed migration, or coastal erosion eliminated them. This allowed to reconstruct the ridges pattern also offshore the present delta apex, where the shoreline retreated approximately 900 m in the last 150 years. Results can be further used to implement conceptual and numerical models of delta evolution. View Full-Text
Keywords: beach ridges; mathematical reconstruction; curve fitting; Ombrone River Delta beach ridges; mathematical reconstruction; curve fitting; Ombrone River Delta
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Mammì, I.; Rossi, L.; Pranzini, E. Mathematical Reconstruction of Eroded Beach Ridges at the Ombrone River Delta. Water 2019, 11, 2281.

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