Mohamed Imrani - Academia.edu (original) (raw)
Papers by Mohamed Imrani
Copyright © 2014 ISSR Journals. This is an open access article distributed under the Creative Com... more Copyright © 2014 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ABSTRACT: In this study we estimate the risk of water erosion in coastal watersheds between M'diq and Fnideq located in northern Morocco, through using a new approach based on spatial cartography. Precisely, the methodology adopted here integrates a Geographic Information System (GIS) with the universal soil loss equation (USLE). The field data includes three major components namely, lithology, degree of slope and vegetation density. Each of these components is represented by a separate layer, in which 1 to 5 value expresses its lateral variability degree. The final map of water-erosion risk is obtained by the sum of superposed indices, separately assigned to three thematic layers (facies, slope and vegetation cover), and multiplied by...
International Journal of Innovation and Applied Studies, 2016
Advanced Space borne Thermal Emission and Reflection Radiometer (ASTER) delivered a digital terra... more Advanced Space borne Thermal Emission and Reflection Radiometer (ASTER) delivered a digital terrain model of a better spatial resolution and accuracy than the traditional free global DEM datasets at near-global coverage and made a wide range of detailed hydrologic applications feasible. In this study, the ASTER data is compared with the digitalized topographic contour DEM in hydrological analysis over the Loukkos catchment in Larache province, Morocco. Extracted stream network and flow directions were compared with the ones derived from the digitalized topographic maps. The result shows, for the stream network, more similarity in average altitude and large differences in lowlands as well as high elevations. For flow directions, the results are almost identical.
International Journal of Innovation and Applied Studies, 2016
Digital elevation models (DEMs), as its name suggests, is a digital representation of ground in t... more Digital elevation models (DEMs), as its name suggests, is a digital representation of ground in terms of altitude. It provides information not only on landforms but also on their geolocation; this is why it is considered one of the most useful digital data sets for a wide range of users. Various field, remote, and laboratory techniques can generate DEMs. Some of the DEMs such as ASTER, SRTM, and GTOPO30 are freely available open source products; however, the accuracy of these data sets is often unknown and is uneven within each dataset due to radar characteristics, type of topography, and physical properties of the surface. In this study, we evaluate open source DEMs (ASTER and SRTM) and their derived attributes using a reference DEM produced by contours maps interpolation and ground control points. In fact, the quality of derived attributes of DEMs such as slopes and drainage network is closely linked to accuracy of DEMs. While Open source DEMs partially show low accuracy in high e...
Apres une presentation generale de la region etudiee, et de son milieu climatique, marin et hydro... more Apres une presentation generale de la region etudiee, et de son milieu climatique, marin et hydrologique, les secteurs rocheux de la cote sont decrits et classes (falaises, morphologies dues ou non aux processus marins, formes de corrosion dans diverses roches); une interpretation est donnee de la genese des formes de corrosion et d'abrasion. Une section plus breve concerne les plages et dunes cotieres (formes majeures et mineures, indices granulometriques, greves de galets).
Copyright © 2014 ISSR Journals. This is an open access article distributed under the Creative Com... more Copyright © 2014 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ABSTRACT: In this study we estimate the risk of water erosion in coastal watersheds between M'diq and Fnideq located in northern Morocco, through using a new approach based on spatial cartography. Precisely, the methodology adopted here integrates a Geographic Information System (GIS) with the universal soil loss equation (USLE). The field data includes three major components namely, lithology, degree of slope and vegetation density. Each of these components is represented by a separate layer, in which 1 to 5 value expresses its lateral variability degree. The final map of water-erosion risk is obtained by the sum of superposed indices, separately assigned to three thematic layers (facies, slope and vegetation cover), and multiplied by...
International Journal of Innovation and Applied Studies, 2016
Advanced Space borne Thermal Emission and Reflection Radiometer (ASTER) delivered a digital terra... more Advanced Space borne Thermal Emission and Reflection Radiometer (ASTER) delivered a digital terrain model of a better spatial resolution and accuracy than the traditional free global DEM datasets at near-global coverage and made a wide range of detailed hydrologic applications feasible. In this study, the ASTER data is compared with the digitalized topographic contour DEM in hydrological analysis over the Loukkos catchment in Larache province, Morocco. Extracted stream network and flow directions were compared with the ones derived from the digitalized topographic maps. The result shows, for the stream network, more similarity in average altitude and large differences in lowlands as well as high elevations. For flow directions, the results are almost identical.
International Journal of Innovation and Applied Studies, 2016
Digital elevation models (DEMs), as its name suggests, is a digital representation of ground in t... more Digital elevation models (DEMs), as its name suggests, is a digital representation of ground in terms of altitude. It provides information not only on landforms but also on their geolocation; this is why it is considered one of the most useful digital data sets for a wide range of users. Various field, remote, and laboratory techniques can generate DEMs. Some of the DEMs such as ASTER, SRTM, and GTOPO30 are freely available open source products; however, the accuracy of these data sets is often unknown and is uneven within each dataset due to radar characteristics, type of topography, and physical properties of the surface. In this study, we evaluate open source DEMs (ASTER and SRTM) and their derived attributes using a reference DEM produced by contours maps interpolation and ground control points. In fact, the quality of derived attributes of DEMs such as slopes and drainage network is closely linked to accuracy of DEMs. While Open source DEMs partially show low accuracy in high e...
Apres une presentation generale de la region etudiee, et de son milieu climatique, marin et hydro... more Apres une presentation generale de la region etudiee, et de son milieu climatique, marin et hydrologique, les secteurs rocheux de la cote sont decrits et classes (falaises, morphologies dues ou non aux processus marins, formes de corrosion dans diverses roches); une interpretation est donnee de la genese des formes de corrosion et d'abrasion. Une section plus breve concerne les plages et dunes cotieres (formes majeures et mineures, indices granulometriques, greves de galets).