Aerial photo-interpretation of shoreline changes at Nouakchott (Mauritania) from 1954 to 2005

Faye, Ibrahima B. Nd.; Hénaff, Alain; Gourmelon, Françoise; Diaw, Amadou Tahirou

doi:10.4000/norois.2146

Cited by 19 publications

(21 citation statements)

References 2 publications

(4 reference statements)

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“…Different data and methods as historical maps, aerial photographs, satellite data processing, unmanned aerial vehicle (UAV), airborne Photogrammetry, GPS, DGPS and field survey are useful tolls to identify different transformations that occurred in the coastal area (Faye Ibrahima et al, 2008;Cohen et al, 2018). Kaliraj et al (2017) used remote sensing and GIS techniques in order to monitor the different changes in the coast of Kanyakumari/India.…”

Section: Methodsmentioning

confidence: 99%

Impact of the Urbanization on Coastal Dune: Case of Kharrouba, West of Algeria

Senouci

Taïbi

2019

J. Sed. Env.

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Despite the coming into force of the Algerian Littoral Law 02/2002, which aimed the protection of the coast and a sustainable use of its resources, construction projects have been authorized on brittle unstable lithology. Relating to this, Kharrouba experienced a tremendous change during the period 2004-2012 due to a massive urbanization. Accordingly, expert’s reports concerning the sustainability of construction projects as required by the Law 01-03-2003, were not sufficient. In this work, we analyzed the morphological coastal transformation of Kharrouba between 1989 and 2016 with particular interest in the decline of the dune due to a strong urban growth. For this purpose, a topographic map and Google Earth Pro pictures were used and processed in a geographical information system (SIG). The results of the diachronic analysis and the evolution of the coastal dune showed that the dune surface increased 23.82 % between 1989 and 2004; a period marked by a low construction activity. On the other hand, the surface of the dune regressed 59.67% during the period 2004-2012 that coincided with a major flat construction for the local population and secondary for the tourism. In addition to the environmental impact, the degradation of the dune led to more erosion, sediment balance disturbance of the beach, and coastal risk susceptibility. Moreover, the study area already experienced two landslides between 2012 and 2014 with negative socioeconomic consequences. A sustainable development of the coastal zone in Kharrouba and the province of Mostaganem should consider the environment and its protection as inevitable conditions for long-term economic activities. Therefore, the stakeholder of this region should comply with the existing laws regarding the preservation of the dune and the respect of the legally fixed distance between the coastline and a planned construction project. TítuloIMPACTO DA URBANIZAÇÃO NA DUNA COSTEIRA: CASO DE KHARROUBA, A OESTE DA ARGÉLIAResumoApesar da entrada em vigor da Lei Argelina sobre o Litoral de 02/2002, que visava a proteção do litoral e o uso sustentável de seus recursos, foi autorizada a implementação de projetos de construção sobre litologia instável e frágil. Em consequência disso, Kharrouba sofreu uma tremenda mudança durante o período de 2004-2012 devido a urbanização maciça. Consequentemente, de acordo com a Lei 01-03-2003, os relatórios de especialistas sobre a sustentabilidade dos projetos de construção, revelam que as medidas tomadas não eram suficientes. Neste trabalho, analisamos a transformação costeira morfológica de Kharrouba entre 1989 e 2016 com particular interesse no declínio da duna devido a um forte crescimento urbano. Para isso, um mapa topográfico e imagens do Google Earth Pro foram usados e processados em um sistema de informações geográficas (SIG). Os resultados da análise diacrônica e a evolução da duna costeira mostraram que a superfície das dunas aumentou 23,82% entre 1989 e 2004; um período marcado por uma baixa atividade de construção. Por outro lado, a superfície da duna regrediu 59,67% durante o período 2004-2012, que coincidiu com o aumento significativo de construção para a população local e para o turismo. Além do impacto ambiental, a degradação da duna levou a mais erosão, perturbação no equilíbrio dos sedimentos da praia e vulnerabilidade a riscos costeiros. Além disso, a área de estudo já sofreu dois deslizamentos entre 2012 e 2014, com consequências socioeconômicas negativas. Para um desenvolvimento sustentável da zona costeira de Kharrouba e da província de Mostaganem deve-se considerar o ambiente e sua proteção como condições indispensáveis para o desenvolvimento de atividades econômicas de longo prazo. Para tanto, as entidades desta região devem cumprir as leis existentes sobre a preservação da duna e o respeito da distância legalmente fixada entre o litoral e as construções civis.Palavras-chave: Argélia. Litoral. Dunas. Impacto. Urbanização. SIG.

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Section: Methodsmentioning

confidence: 99%

Impact of the Urbanization on Coastal Dune: Case of Kharrouba, West of Algeria

Senouci

Taïbi

2019

J. Sed. Env.

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“…La méthode classique de correction géométrique ou de rectification utilisée par plusieurs auteurs (Dolan et al, 1991 ;Durand et Heurtefeux, 2006 ;Faye et al, 2008 ;Bouabdallah et Larue, 2009) a été adoptée pour rendre les traits de côte comparables. Celle-ci a consisté à géo-référencer deux à deux les supports avec le logiciel Erdas en adoptant le mode polynomial d'ordre deux qui nécessite six amers pour lancer l'opération de correction.…”

Section: Correction Géométrique Des Supports Numériquesunclassified

“…Dans le monde, les plages sableuses qui sont des formes d'accumulations sédimentaires évoluent à des vitesses variables (Bird, 1985, Paskoff, 1998. En Afrique de l'ouest, de la Mauritanie à la Sierra Léone les plages régressent à un taux estimé entre 1,2 et 6 m/an (PNUE, 1989 ;Cicin-Sain et Knecht, 1998 ;Faye et al, 2008 ;Faye, 2010). Les flèches sableuses à pointe libre sont aussi concernées par le processus.…”

Section: Introductionunclassified

Étude comparative de l’évolution du trait de côte sur deux flèches sableuses de la Petite Côte (Sénégal) : cas de Joal et de Djiffère

Diadhiou¹,

Ndour²,

Niang³

et al. 2016

norois

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Revue en ligne : http://norois.revues.org www.pur-editions.fr Étude comparative de l'évolution du trait de côte sur deux flèches sableuses de la Petite Côte (Sénégal) : cas de Joal et de Djiffère Comparative Study of Shoreline Evolution on the Sandspits of the "Petite Côte" (Senegal) : Case of Joal and Djiffère Yves Birame Diadhiou a *, Abdoulaye Ndour b , Isabelle Niang b et Awa Niang-Fall c Résumé : Les flèches sableuses de Joal et de Djiffère, situées sur la Petite Côte du Sénégal, présentent des évolutions différentes. La cinématique du trait de côte est assez complexe à Joal contrairement à Palmarin-Djiffère où le taux de recul est graduel, en particulier aux extrémités nord et sud de la flèche. La tendance moyenne de recul des traits de côte digitalisés après correction géométrique (1989 à 2013) donne un taux de recul insignifiant de-0,82 m/an (20,4 m) à Joal et important à Palmarin-Djiffère (-3,83 m/an soit 91,92 m). Les bilans sédimentaires trimestriels obtenus par suivi des profils de plage de janvier 2012 à septembre 2013 indiquent des échanges sédimentaires permettant d'identifier les mois de janvier, février, juillet et août comme des périodes d'érosion, et mars et septembre de reconstitution des plages. La dynamique de ces littoraux est en cohérence avec le régime des houles

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“…In addition, the morphodynamic change in the estuary affects the morphology of neighboring littoral areas and, consequently, causes the shoreline fluctuation [3,[29][30][31]. Numerous works have analyzed the morphologic evolution of coastal systems through multi-temporal photographs [30,[32][33][34][35][36][37][38][39][40].This study is an attempt to provide elements to aid in understanding the Oum Er-Rbia coastal system's behavior by analyzing the estuarine morphodynamic evolution and comparing it with the evolution of the hydraulic facilities installed in the catchment area, as well as the shoreline changes observed in the neighboring marine beaches.represents less than 3% of the main watercourse, but its situation downstream makes its important as a zone sensible to hydrodynamic changes in both upstream and littoral areas. The hydraulic infrastructure is composed of fifteen dam reservoirs, installed on the Oum Er-Rbia main stream and its tributaries [51,54,55], where the closest construction is the Sidi Daoui dam at 15 km upstream.…”

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confidence: 99%

mentioning

confidence: 99%

Impact of Anthropogenic Facilities on the Morphodynamic Evolution of an Estuarine System: The Case of Oum Er-Rbia Estuary (Azemmour, Morocco)

Jakani

Ettazarini

Rhinane

et al. 2019

JMSE

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The Oum Er-Rbia estuary is located on the Atlantic littoral of Morocco. It undergoes severe clogging due to the sand deposition in its outlet. The current study examined the indicators of the morphodynamic evolution in the littoral system including the Oum Er-Rbia estuary and the neighboring beaches over 1970-2017. The methodology adopted was based on the analysis and the interpretation of aerial photographs and Google Earth images under a GIS environment and field work. The morphodynamic evolution was discussed by taking into account the evolution of hydraulic facilities installed in the watershed area, especially the construction of dams, as well as the dredging works in the Oum Er-Rbia estuary. The results highlight the morphologic evolution estimated in terms of surface units observed in the estuary and the neighboring beaches. The evolution of the littoral system was mainly influenced by the closest dam location and by the dredging works, in addition to the regulation of the river flow by the installation of hydraulic facilities upstream.anthropogenic factors such as hydraulic facilities, engineering works of protection and rehabilitation, dredging, etc. [6][7][8][9][10].The bathymetry and the morphology of an intertidal plain and transversal section of a shallow bottom estuary cause a tide asymmetry that affects the flow duration, compared to the ebb time, and the celerity of the tide current [1,2,[10][11][12]. In coastal environments, the waves generate coastal currents that interact with incident waves and lead to the sediment transportation and the process is favored when the angle between the waves and the coastal line is significant [13][14][15][16]. As a response to coastal hydrodynamics, the alternation of sedimentation and erosion processes in the estuary can generate net sedimentary balances through a tide cycle [17,18].The installation of hydraulic reservoirs in upstream areas affects the hydrodynamic equilibrium and sedimentary balances downstream, due to the flood water regulation and the decrease of the solid sediments supply [19][20][21][22][23][24][25]. Blott) [26] concluded that the morphodynamic evolution of Mersey estuary in England through a period of 150 years was mainly controlled by engineering and rehabilitation works, such as the construction of training walls and dredging. Besides, the importance of other factors, notably sea level change, tide amplitude, wave current, and supply of fresh water was relatively reduced [26].The perturbation of estuarine hydrodynamics is permanently regulated by morphologic transformations through sedimentation and erosion processes mobilized to re-establish the hydrodynamic equilibrium [21,22,27]. The morphodynamic change concerns the estuary outlet, the main channel, and the intertidal plains [19,20,28]. In addition, the morphodynamic change in the estuary affects the morphology of neighboring littoral areas and, consequently, causes the shoreline fluctuation [3,[29][30][31]. Numerous works have analyzed the morphologic evolution of coastal systems t...

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Aerial photo-interpretation of shoreline changes at Nouakchott (Mauritania) from 1954 to 2005

Cited by 19 publications

References 2 publications

Impact of the Urbanization on Coastal Dune: Case of Kharrouba, West of Algeria

Impact of the Urbanization on Coastal Dune: Case of Kharrouba, West of Algeria

Étude comparative de l’évolution du trait de côte sur deux flèches sableuses de la Petite Côte (Sénégal) : cas de Joal et de Djiffère

Impact of Anthropogenic Facilities on the Morphodynamic Evolution of an Estuarine System: The Case of Oum Er-Rbia Estuary (Azemmour, Morocco)

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