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A long-term record of land use change impacts on sediments in Oualidia lagoon,Morocco

International Journal of Sediment Research 2014年第1期29卷 1-10页

作者： Mehdi MAANAN Ana Carolina RUIZ-FERNNDEZ Mohamed MAANAN Paul FATTAL bendahhou zourarah Mohamed SAHABI Géolittomer UMR 6554 LETG Université de Nantes Marine Geosciences Laboratory URAC 45Earth Sciences departmentFaculty of Sciences Universidad Nacional Autónoma de México.Instituto de Ciencias del Mary Limnología

An integrated approach,involving land use patterns and heavy metal contents of the surficial and cored sediment,was proposed to detect the characteristic spatial and temporal scale of point and non-point source human disturbances on the Oualidia lagoon in *** and description of the temporal and spatial distributions of the main contamination sources of heavy metals are analyzed using statistics and GIS *** results show that surficial sediments are highly enriched in heavy metals compared to their preindustrial background ***-use types affected lagoon sediment pollution in different ways:1) agricultural areas had the highest potential for sediment contamination by heavy metals,particularly Pb,Cu and Hg,2) Ni and Cr are the main pollutants originating from urban sewage and 3) oyster farming and traditional land uses such as salt flats,pastures showed low levels of others *** enrichment factors(normalized by Al) obtained from the sediment cores indicated that the lagoon is(strongly/moderately) polluted by all metals which were attributed to agricultural activities and wastewater discharges from urbanized areas.

关键词： Land use change(LUC) Geographical information systems(GIS) Sediment pollution Risk assessment

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Spatio-Temporal Dynamics and Evolution of Land Use Land Cover Using Remote Sensing and GIS in Sebou Estuary, Morocco

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Journal of Geographic Information System 2019年第5期11卷 551-566页

作者： Ayoub El Adnani Adnane Habib Khalid El khalidi bendahhou zourarah Laboratoire Géosciences Marines et Sciences des sols—LGMSS—URAC 45 Faculté des sciences El Jadida El Jadida Morocco DBAR_ICoE-EOAWARE (LGMSS-URAC45) Chouaib Doukkali University BD Jabran Khalil Jabran EL Jadida Morocco State Key Laboratory of Remote Sensing Science Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences Beijing China.

Land use and land cover (LULC) represent the ongoing challenge of environmental variation. The understanding of the level and process of its change is the basis for any environmental planning and management. In Morocco, as everywhere in the world, human population densities are constantly increasing on the coastal zones. This results in a continuous and rapid acceleration of the use of coastal space and an increase in pressures on ecosystems and the different species they contain. The purpose of this study is the analysis of the changes in LULC from 1985 to 2017 in the coastal area of Sebou estuary, situated in the Northwest of the Moroccan Atlantic coast. The changes were identified and assessed after classifying a series of Landsat images taken during 1985, 2002 and 2017. The algorithm used for the classification is the Support Vector Machine (SVM), which yielded results with accuracy higher than 85%. The results of the land use land cover change describe phenomenal urbanization and deforestation, as well as an evolution of the agricultural sector, indicating the impact of anthropization in this vulnerable environment.

关键词： LULC Change Detection Accuracy Assessment Landsat Sebou Estuary Anthropization

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