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Application of a Geomatics Approach for the Diachronic Study of the Meditterannean Coastline Case of Tangier Bay

International Journal of Geosciences 2018年第6期9卷 320-336页

作者： Fatima Zahra Salim Mohammed Yassine El habti lech-hab khadija ben hamman Ahmed Raissouni Abdelkrim El Arrim Laboratoire "Environnement Océanologie et Ressources Naturelles" Dpt. des Sciences dela Terre FST de Tanger Km 9 Route de Ziatine Maroc

The coastline is one of the country’s most important environmental and economic resources. However, it is a delicate and highly coveted environ-ment on which many factors of evolution interact, both anthropogenic and natural. This work is concerned with the diachronic study of the coastline of the Mediterranean coast, particularly the coastal fringe at the level of Tangier Bay. In order to experimentally confirm the numerical models used and to take part in the development of an accurate, reliable and rapid decision support system for the assessment and remediation of the risks of accretion and coastal erosion, the methodology followed consists of the application of automatic analytical techniques, based on a geomatics approach, using a multi-temporal photo-interpretation, a Geographical Information System (GIS) and a computerized data analysis system (DSAS: Digital Shoreline Analysis System). The change rate will be calculated from the multi-date maps (1981-96 and 2017) using the End Point Rate (EPR). To achieve our objective, the study area was divided into three sectors from East to West: El Ghandouri Beach, Malabata Beach and the municipal square adjacent to the port. The GIS analysis of the data obtained shows that the coastline is present by location and for the three periods of comparison of the remarkable zones of erosion and sedimentation.

关键词： Mediterranean Coastline (SIG) Geographic Information System (DSAS) Digital Shoreline Analysis System Accretion Erosion

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Effects of Vegetation Cover and Land Use Changes on Soil Erosion in Kalaya Watershed (North Western Morocco)

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International Journal of Geosciences 2015年第12期6卷 1353-1366页

作者： khadija ben hamman lech-hab Lamiae Khali Issa Ahmed Raissouni Abdelkrim El Arrim Abdelghani Afailal Tribak Rachid Moussadek Department of Earth Sciences Laboratory of Environment Oceanology and Natural Resources Faculty of Sciences and Technologies Abdelmalek Essaadi University Tangier Morrocco Unit of Environmental Research and Conservation of Natural Resources Laboratory of Mapping GIS and Remote Sensing Regional Centre of Agricultural Research INRA Rabat Morrocco

Vegetation cover degradation is still a very common problem in many parts of Morocco;moreover, it affects straight up the amount of the annual soil loss rate. The analytical approach used in this study, respectively, includes remote sensing techniques, application of USLE (Universal Soil Loss Equation) and overlay analysis in a raster Geographic Information System (GIS) environment, employing available information on the region covering the Kalaya catchment. Thus, this procedure allowed the calculation of the NDVI (Normalized Difference Vegetation Index), the execution of two types of classification (unsupervised and supervised) for 1999 and 2010 imagery and eventually the prediction of soil erosion risk in the watershed in question. The main outcome was the production of multidate vegetation cover maps, land use maps and soil loss risk maps. The overlay of two maps allowed us to highlight the changes occurred in this area, which evidence the high anthropogenic impact on the dynamics of land use and vegetation cover. The results suggest that the outputs of this study can be used for predicting rate of soil loss, which varied from 31.68 t·ha-1·yr-1 in 1999 to 34.74 t·ha-1·yr-1 in 2010.

关键词： Remote Sensing GIS Kalaya Catchment Land Use USLE

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