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A review and meta-analysis of remote sensing data, GIS methods, materials and indices used for monitoring the coastline evolution over the last twenty years
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The current review study focuses on a statistical analysis (Meta-analysis) of the most common methods, materials, software, and indices used by researchers over the last twenty years to evaluate and quantify the shoreline evolution. Furthermore, this review targets to highlight some critical points through studied literature such as a) the low rate of high-resolution satellite images usage in a subject where the accuracy is prerequisite, b) the effort to derive information from Landsat images in order to take advantage of the 50-years archive and the freely availability c) the impulse of the UAV during the last 5 years as an alternative low cost but high accurate source of data d) the fact that only 50% of the coastal erosion studies are funded. One hundred thirty-eight papers and articles have been analyzed in detail by the authors and all the key points (methods, materials, software, and indices) were sorted for further statistical analysis. This study is not intended to criticize neither the methods nor the results being mentioned in the previous studies but to give the opportunity to the researchers (especially the new ones) to have an overall view of the subject for the last 20 years with just a glimpse.
The application of GIS and remote sensing in a spatiotemporal analysis of coastline retreat in Rufisque, Senegal
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This paper is aimed at analyzing the phenomenon of shoreline retreat in the locality of Rufisque from 1978 to 2018 mainly using geospatial data and field
visits. A set of Landsat images from different dates at 10 year intervals was then acquired through the United States Geological Survey platform and shoreline
change analysis was run using the Digital Shoreline Analysis System. In addition to that desktop work, interactions with local residents allowed the deter‑
mination of ongoing adaptation strategies actually in place to cope with coastal erosion. The study showed that Rufisque is subject to serious rates of erosion
reaching −19.48 m/year from 1978–1988, close to −8 m/year from 1988–1998, −5.88 m/year from 1998–2008 and −6.67 m/year from 2008–2018. Beside
that coastal erosion, it has been noticed that the coastline also experienced in some of its parts cases of accretion reaching 4.94 m/year for 1988–1998,
7.29 m/year from 1998–2008 and 7.68 m/year during the period 2008–2018. In terms of surfaces, Rufisque’ shoreline respectively lost 156.81 ha (1978–1988),
80.55 ha (1988–1998), 6.94 ha (1998–2008), 12.93 ha (2008–2018) and in the same note gained 2.86 ha (1988–1998), 32.51 ha (1998–2008) and 19.16 ha (2008–2018)
attesting to the fact that the coastline is subject to both spatiotemporal changes.
Finally, this study also reveals that while authorities’ reaction is taking place atmuch lower pace, local communities are actually using their ingenuity to put in
place strategies to tackle coastal erosion.
Etat des connaissances sur le Crabe bleu, Callinectes sapidus (Rathbun, 1896)
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Ce travail de recueil des connaissances, relatif à l’espèce Callinectes sapidus, nous a paru essentiel tout d’abord (i) afin de disposer d’un panorama synthétique et classé des travaux déjà réalisés sur l’espèce pour mieux adapter les mesures de gestion et (ii) évaluer les connaissances à l’échelle du bassin Méditerranéen. En effet, la Méditerranée possède un environnement très différent de l’aire d’origine du Crabe bleu et les données/études semblent lacunaires dans cette
région.
Ce travail bibliographique a fait l’objet d’une analyse des publications majeures en rapport avec les thèmes arrêtés, et présentés ci-dessous, en lien avec nos besoins et s’est appuyé sur la fiche descriptive de l’espèce rédigée par Noël (2017) :
- description morphologique ;
- cycle de développement ;
- la mue et la croissance ;
- distribution géographique, zoom sur la Méditerranée ;
- lien entre ses habitats et ses migrations
- caractéristiques trophiques et pathologies ;
- pêcherie et économie.
Premier signalement du crabe bleu Portunus Segnis (FORSKÅL, 1775) dans le sud du Golf de Hammamet (Centre-Est de la Tunisie)
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Le présent travail signale la présence du crabe bleu Portunus segnis (Forskål, 1775), une espèce lessepsienne, dans le sud du golfe de Hammamet au centre est de la Tunisie après son signalement dans le golfe de Gabès en 2014 et son expansion dans cette zone surtout durant les années 2015 et 2016. Deux spécimens de cette espèce ont été capturés vivants par deux pêcheurs locaux de la ville de Monastir aux environs du port de pêche à des faibles profondeurs. Le premier a été pêché à l’aide des filets maillants de fond, le 15 novembre 2016, par environ10 mètres de profondeur. Le deuxième a été capturé par une senne tournante non coulissante (lampara), le 20 décembre 2016, à environ 5 - 7 mètres de profondeur.
Invasive portunid crabs in Libyan waters: first record of the Atlantic blue crab Callinectes sapidus Rathbun, 1896 and range expansion of the swimming blue
crab Portunus segnis (Forskål, 1775)
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The occurrence of the portunid Callinectes sapidus is documented for the first time from Libyan waters. The record fills a gap of knowledge concerning the distribution of this non-indigenous crab of Atlantic origin, that currently has invaded almost all the Mediterranean basin. Recent records of the Lessepsian crab Portunus segnis, already known from Libyan waters, ascertain furthermore its establishment within and its range expansion along the coastline of the country
Effect of invasive blue carb CHITOSAN coating on extending the shelf life and quality of fresh strawberry fruits
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The diversity of marine biomasses is a set of exploitable and renewable resources with application in several sectors. The blue crab was considered as a threat by the Tunisian fishermen in 2014, since it induces several damages on nets but also on captures. In addition, in 2017, the Tunisian State launched a plan to exploit and promote this species of crab. In the context of valuation, the chitin was isolated by a conventional chemical method from the shell of blue crabs. The efficiency of chitin extraction from Callinectes sapidus (C. sapidus) was achieved with a yield of 27.6 %.Then; the chitosan was prepared by N-deacetylation of chitin with a yield of 16 %, leading to a degree of acetylation (DA) of 89.9%. For Portunus segnis (P. segnis) the yield of chitin was 31.2% while the chitosan yield was 20% and the degree of acetylation was 79.9% After these analyzes, it can be deduced that chitosan has a high degree of purity and that it is considered effective for the preservation of strawberries in favor of its antioxidant and antimicrobial capacity.
A review and meta-analysis of remote sensing data, GIS methods, materials and indices used for monitoring the coastline evolution over the last twenty years
- Auteur
- Ganias, Konstantinos
- Sujet
- Meta-analysis; GIS; Remote sensing; Coastal erosion
- Date_TXT
- 2021
- Type de document
- Article
The application of GIS and remote sensing in a spatiotemporal analysis of coastline retreat in Rufisque, Senegal
- Auteur
- Cheikh Tidiane Koulibaly, Johnson O. Ayoade
- Sujet
- Spatiotemporal change; Coastline; Erosion; Accretion; Adaptation; Rufisque
- Date_TXT
- 2021
- Type de document
- Article
Etat des connaissances sur le Crabe bleu, Callinectes sapidus (Rathbun, 1896)
- Auteur
- Dimitri Veyssiere, Marie Garrido
- Sujet
- Callinectes sapidus; Télémétrie acoustique; Crabe bleu
- Date_TXT
- 2022
- Type de document
- Article
Premier signalement du crabe bleu Portunus Segnis (FORSKÅL, 1775) dans le sud du Golf de Hammamet (Centre-Est de la Tunisie)
- Auteur
- Marouène BDIOUI
- Sujet
- Portunus segnis; Golfe de Hammamet; Tunisie; Espèces exotiques.
- Date_TXT
- 2016
- Type de document
- Article
Invasive portunid crabs in Libyan waters: first record of the Atlantic blue crab Callinectes sapidus Rathbun, 1896 and range expansion of the swimming blue
crab Portunus segnis (Forskål, 1775)
- Auteur
- Maria Corsini-Foka, Abdulghani Abdulghani, Sara A.A. Al Mabruk
- Sujet
- Bio-invasion; Non-indigenous species; Portunidae; Mediterranean Sea; Citizen science
- Date_TXT
- 2021
- Type de document
- Article
Effect of invasive blue carb CHITOSAN coating on extending the shelf life and quality of fresh strawberry fruits
- Auteur
- Oumayma Fekri, Nawzet Bouriga, Dhaker Troudi
- Sujet
- Invasive species; Decapods; Blue crab shell; Chitosan; Antimicrobial and antioxidant activity; Tunisian
waters.
- Date_TXT
- 2022
- Type de document
- Article