Coastline dynamics of the northern Lower Casamance (Senegal) and southern Gambia littoral from 1968 to 2017
Northern Lower Casamance and southern Gambia's beaches, just like those of West Africa, are subject to significant morpho-sedimentary dynamics characterized by coastline mobility. Such mobility, combined with significant variations in different places, is characterized by some globally erosive...
Gespeichert in:
| Veröffentlicht in: | Journal of African earth sciences (1994) 2019-12, Vol.160, p.103611, Article 103611 |
|---|---|
| Hauptverfasser: | , , , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | |
|---|---|
| container_issue | |
| container_start_page | 103611 |
| container_title | Journal of African earth sciences (1994) |
| container_volume | 160 |
| creator | Thior, Mamadou Sané, Tidiane Dièye, El hadj B. Sy, Oumar Cissokho, Dramane Ba, Boubacar Demba Descroix, Luc |
| description | Northern Lower Casamance and southern Gambia's beaches, just like those of West Africa, are subject to significant morpho-sedimentary dynamics characterized by coastline mobility. Such mobility, combined with significant variations in different places, is characterized by some globally erosive trend (−1.2–6 m/year, in sandy areas extending from Senegal to Sierra Leone and −1 to −15 m/year from Ivory Coast to Nigeria). The purpose of this article is to analyze the coastline evolution in Lower Casamance and southern Gambia based on a diachronic survey (1968–2017). The reference line used to demonstrate the variation of the coastline is the vegetation boundary.
The results obtained are based on the digital processing of geospatial data (aerial photographs, Landsat and Google Earth images).
The different variations of the coastline are obtained through the calculation of two indexes considered as the most relevant ones. The first one, the End Point Rate (EPR) index, helped measure the difference between two successive coastlines and the second one, the Linear Regression Rate (LRR) index, allows assessing the ability to estimate the evolution of each segment over the entire period considered. These mobility indexes (EPR and LRR) show some variable dynamics of the coastline, featured by two trends: the first one, under accretion in the 1968–1986 period and the other one, globally erosive during 1986–2017 period.
Due to the socio-economic and ecological importance of the West African coastline, the highlight in this study are:•To reflect on the evolution of the coastline to prevent coastal risks in a context of climate change marked mainly by the elevation sea level.•By fact that the littoral of northern Lower Casamance and southern Gambia, which is the subject of this study, has for many years now been faced with the decline of the coastline,•And then the consequences of which remain significant both environmentally and socioeconomically |
| doi_str_mv | 10.1016/j.jafrearsci.2019.103611 |
| format | Article |
| fullrecord | <record><control><sourceid>hal_cross</sourceid><recordid>TN_cdi_hal_primary_oai_HAL_ird_02281200v1</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S1464343X19302663</els_id><sourcerecordid>oai_HAL_ird_02281200v1</sourcerecordid><originalsourceid>FETCH-LOGICAL-a425t-bf88f5204549e9efe242cb53e984f45c7662a579f329a0c80053b624a4fe2803</originalsourceid><addsrcrecordid>eNqFkMFOwzAMhisEEmPwDjmyQ0eSpm1yHBNsSJM4sAO3yGsdltI2KClDe3syFcGRky3r-y37SxLC6JxRVtw18waMR_ChsnNOmYrjrGDsLJkwWaqUqbw4j70oRJqJ7PUyuQqhoZQrKfgkeV86CENreyT1sYfOVoE4Q4Y9kt75WHxPNu4LPVlCgA76CsntC_b4Bu2MQF-T4D5HbAXdzgJp7TA4Dy0x3nWEqUKSwZF4WXmdXBhoA9781GmyfXzYLtfp5nn1tFxsUhA8H9KdkdLknIpcKFRokAte7fIM48VG5FVZFBzyUpmMK6CVpDTPdgUXICIqaTZNZuPaPbT6w9sO_FE7sHq92Gjra005l4xTemCRlSNbeReCR_MbYFSf_OpG__nVJ7969Buj92MU4ysHi15HAqOf2nqsBl07-_-Sb4MWhw0</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>Coastline dynamics of the northern Lower Casamance (Senegal) and southern Gambia littoral from 1968 to 2017</title><source>Elsevier ScienceDirect Journals Complete</source><creator>Thior, Mamadou ; Sané, Tidiane ; Dièye, El hadj B. ; Sy, Oumar ; Cissokho, Dramane ; Ba, Boubacar Demba ; Descroix, Luc</creator><creatorcontrib>Thior, Mamadou ; Sané, Tidiane ; Dièye, El hadj B. ; Sy, Oumar ; Cissokho, Dramane ; Ba, Boubacar Demba ; Descroix, Luc</creatorcontrib><description>Northern Lower Casamance and southern Gambia's beaches, just like those of West Africa, are subject to significant morpho-sedimentary dynamics characterized by coastline mobility. Such mobility, combined with significant variations in different places, is characterized by some globally erosive trend (−1.2–6 m/year, in sandy areas extending from Senegal to Sierra Leone and −1 to −15 m/year from Ivory Coast to Nigeria). The purpose of this article is to analyze the coastline evolution in Lower Casamance and southern Gambia based on a diachronic survey (1968–2017). The reference line used to demonstrate the variation of the coastline is the vegetation boundary.
The results obtained are based on the digital processing of geospatial data (aerial photographs, Landsat and Google Earth images).
The different variations of the coastline are obtained through the calculation of two indexes considered as the most relevant ones. The first one, the End Point Rate (EPR) index, helped measure the difference between two successive coastlines and the second one, the Linear Regression Rate (LRR) index, allows assessing the ability to estimate the evolution of each segment over the entire period considered. These mobility indexes (EPR and LRR) show some variable dynamics of the coastline, featured by two trends: the first one, under accretion in the 1968–1986 period and the other one, globally erosive during 1986–2017 period.
Due to the socio-economic and ecological importance of the West African coastline, the highlight in this study are:•To reflect on the evolution of the coastline to prevent coastal risks in a context of climate change marked mainly by the elevation sea level.•By fact that the littoral of northern Lower Casamance and southern Gambia, which is the subject of this study, has for many years now been faced with the decline of the coastline,•And then the consequences of which remain significant both environmentally and socioeconomically</description><identifier>ISSN: 1464-343X</identifier><identifier>EISSN: 1879-1956</identifier><identifier>DOI: 10.1016/j.jafrearsci.2019.103611</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Coastal evolution ; Coastlines erosion ; Earth Sciences ; Environment and Society ; Environmental Sciences ; Gambia ; Geomorphology ; Geospatial techniques ; Global Changes ; Lower Casamance ; Risk mapping ; Sciences of the Universe</subject><ispartof>Journal of African earth sciences (1994), 2019-12, Vol.160, p.103611, Article 103611</ispartof><rights>2019 Elsevier Ltd</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a425t-bf88f5204549e9efe242cb53e984f45c7662a579f329a0c80053b624a4fe2803</citedby><cites>FETCH-LOGICAL-a425t-bf88f5204549e9efe242cb53e984f45c7662a579f329a0c80053b624a4fe2803</cites><orcidid>0000-0001-6477-1195</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S1464343X19302663$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>230,314,776,780,881,3537,27901,27902,65534</link.rule.ids><backlink>$$Uhttps://ird.hal.science/ird-02281200$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Thior, Mamadou</creatorcontrib><creatorcontrib>Sané, Tidiane</creatorcontrib><creatorcontrib>Dièye, El hadj B.</creatorcontrib><creatorcontrib>Sy, Oumar</creatorcontrib><creatorcontrib>Cissokho, Dramane</creatorcontrib><creatorcontrib>Ba, Boubacar Demba</creatorcontrib><creatorcontrib>Descroix, Luc</creatorcontrib><title>Coastline dynamics of the northern Lower Casamance (Senegal) and southern Gambia littoral from 1968 to 2017</title><title>Journal of African earth sciences (1994)</title><description>Northern Lower Casamance and southern Gambia's beaches, just like those of West Africa, are subject to significant morpho-sedimentary dynamics characterized by coastline mobility. Such mobility, combined with significant variations in different places, is characterized by some globally erosive trend (−1.2–6 m/year, in sandy areas extending from Senegal to Sierra Leone and −1 to −15 m/year from Ivory Coast to Nigeria). The purpose of this article is to analyze the coastline evolution in Lower Casamance and southern Gambia based on a diachronic survey (1968–2017). The reference line used to demonstrate the variation of the coastline is the vegetation boundary.
The results obtained are based on the digital processing of geospatial data (aerial photographs, Landsat and Google Earth images).
The different variations of the coastline are obtained through the calculation of two indexes considered as the most relevant ones. The first one, the End Point Rate (EPR) index, helped measure the difference between two successive coastlines and the second one, the Linear Regression Rate (LRR) index, allows assessing the ability to estimate the evolution of each segment over the entire period considered. These mobility indexes (EPR and LRR) show some variable dynamics of the coastline, featured by two trends: the first one, under accretion in the 1968–1986 period and the other one, globally erosive during 1986–2017 period.
Due to the socio-economic and ecological importance of the West African coastline, the highlight in this study are:•To reflect on the evolution of the coastline to prevent coastal risks in a context of climate change marked mainly by the elevation sea level.•By fact that the littoral of northern Lower Casamance and southern Gambia, which is the subject of this study, has for many years now been faced with the decline of the coastline,•And then the consequences of which remain significant both environmentally and socioeconomically</description><subject>Coastal evolution</subject><subject>Coastlines erosion</subject><subject>Earth Sciences</subject><subject>Environment and Society</subject><subject>Environmental Sciences</subject><subject>Gambia</subject><subject>Geomorphology</subject><subject>Geospatial techniques</subject><subject>Global Changes</subject><subject>Lower Casamance</subject><subject>Risk mapping</subject><subject>Sciences of the Universe</subject><issn>1464-343X</issn><issn>1879-1956</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNqFkMFOwzAMhisEEmPwDjmyQ0eSpm1yHBNsSJM4sAO3yGsdltI2KClDe3syFcGRky3r-y37SxLC6JxRVtw18waMR_ChsnNOmYrjrGDsLJkwWaqUqbw4j70oRJqJ7PUyuQqhoZQrKfgkeV86CENreyT1sYfOVoE4Q4Y9kt75WHxPNu4LPVlCgA76CsntC_b4Bu2MQF-T4D5HbAXdzgJp7TA4Dy0x3nWEqUKSwZF4WXmdXBhoA9781GmyfXzYLtfp5nn1tFxsUhA8H9KdkdLknIpcKFRokAte7fIM48VG5FVZFBzyUpmMK6CVpDTPdgUXICIqaTZNZuPaPbT6w9sO_FE7sHq92Gjra005l4xTemCRlSNbeReCR_MbYFSf_OpG__nVJ7969Buj92MU4ysHi15HAqOf2nqsBl07-_-Sb4MWhw0</recordid><startdate>201912</startdate><enddate>201912</enddate><creator>Thior, Mamadou</creator><creator>Sané, Tidiane</creator><creator>Dièye, El hadj B.</creator><creator>Sy, Oumar</creator><creator>Cissokho, Dramane</creator><creator>Ba, Boubacar Demba</creator><creator>Descroix, Luc</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>AAYXX</scope><scope>CITATION</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0001-6477-1195</orcidid></search><sort><creationdate>201912</creationdate><title>Coastline dynamics of the northern Lower Casamance (Senegal) and southern Gambia littoral from 1968 to 2017</title><author>Thior, Mamadou ; Sané, Tidiane ; Dièye, El hadj B. ; Sy, Oumar ; Cissokho, Dramane ; Ba, Boubacar Demba ; Descroix, Luc</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a425t-bf88f5204549e9efe242cb53e984f45c7662a579f329a0c80053b624a4fe2803</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Coastal evolution</topic><topic>Coastlines erosion</topic><topic>Earth Sciences</topic><topic>Environment and Society</topic><topic>Environmental Sciences</topic><topic>Gambia</topic><topic>Geomorphology</topic><topic>Geospatial techniques</topic><topic>Global Changes</topic><topic>Lower Casamance</topic><topic>Risk mapping</topic><topic>Sciences of the Universe</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Thior, Mamadou</creatorcontrib><creatorcontrib>Sané, Tidiane</creatorcontrib><creatorcontrib>Dièye, El hadj B.</creatorcontrib><creatorcontrib>Sy, Oumar</creatorcontrib><creatorcontrib>Cissokho, Dramane</creatorcontrib><creatorcontrib>Ba, Boubacar Demba</creatorcontrib><creatorcontrib>Descroix, Luc</creatorcontrib><collection>CrossRef</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Journal of African earth sciences (1994)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Thior, Mamadou</au><au>Sané, Tidiane</au><au>Dièye, El hadj B.</au><au>Sy, Oumar</au><au>Cissokho, Dramane</au><au>Ba, Boubacar Demba</au><au>Descroix, Luc</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Coastline dynamics of the northern Lower Casamance (Senegal) and southern Gambia littoral from 1968 to 2017</atitle><jtitle>Journal of African earth sciences (1994)</jtitle><date>2019-12</date><risdate>2019</risdate><volume>160</volume><spage>103611</spage><pages>103611-</pages><artnum>103611</artnum><issn>1464-343X</issn><eissn>1879-1956</eissn><abstract>Northern Lower Casamance and southern Gambia's beaches, just like those of West Africa, are subject to significant morpho-sedimentary dynamics characterized by coastline mobility. Such mobility, combined with significant variations in different places, is characterized by some globally erosive trend (−1.2–6 m/year, in sandy areas extending from Senegal to Sierra Leone and −1 to −15 m/year from Ivory Coast to Nigeria). The purpose of this article is to analyze the coastline evolution in Lower Casamance and southern Gambia based on a diachronic survey (1968–2017). The reference line used to demonstrate the variation of the coastline is the vegetation boundary.
The results obtained are based on the digital processing of geospatial data (aerial photographs, Landsat and Google Earth images).
The different variations of the coastline are obtained through the calculation of two indexes considered as the most relevant ones. The first one, the End Point Rate (EPR) index, helped measure the difference between two successive coastlines and the second one, the Linear Regression Rate (LRR) index, allows assessing the ability to estimate the evolution of each segment over the entire period considered. These mobility indexes (EPR and LRR) show some variable dynamics of the coastline, featured by two trends: the first one, under accretion in the 1968–1986 period and the other one, globally erosive during 1986–2017 period.
Due to the socio-economic and ecological importance of the West African coastline, the highlight in this study are:•To reflect on the evolution of the coastline to prevent coastal risks in a context of climate change marked mainly by the elevation sea level.•By fact that the littoral of northern Lower Casamance and southern Gambia, which is the subject of this study, has for many years now been faced with the decline of the coastline,•And then the consequences of which remain significant both environmentally and socioeconomically</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.jafrearsci.2019.103611</doi><orcidid>https://orcid.org/0000-0001-6477-1195</orcidid><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 1464-343X |
| ispartof | Journal of African earth sciences (1994), 2019-12, Vol.160, p.103611, Article 103611 |
| issn | 1464-343X 1879-1956 |
| language | eng |
| recordid | cdi_hal_primary_oai_HAL_ird_02281200v1 |
| source | Elsevier ScienceDirect Journals Complete |
| subjects | Coastal evolution Coastlines erosion Earth Sciences Environment and Society Environmental Sciences Gambia Geomorphology Geospatial techniques Global Changes Lower Casamance Risk mapping Sciences of the Universe |
| title | Coastline dynamics of the northern Lower Casamance (Senegal) and southern Gambia littoral from 1968 to 2017 |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-02-14T19%3A21%3A37IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-hal_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Coastline%20dynamics%20of%20the%20northern%20Lower%20Casamance%20(Senegal)%20and%20southern%20Gambia%20littoral%20from%201968%20to%202017&rft.jtitle=Journal%20of%20African%20earth%20sciences%20(1994)&rft.au=Thior,%20Mamadou&rft.date=2019-12&rft.volume=160&rft.spage=103611&rft.pages=103611-&rft.artnum=103611&rft.issn=1464-343X&rft.eissn=1879-1956&rft_id=info:doi/10.1016/j.jafrearsci.2019.103611&rft_dat=%3Chal_cross%3Eoai_HAL_ird_02281200v1%3C/hal_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_id=info:pmid/&rft_els_id=S1464343X19302663&rfr_iscdi=true |