Papers by Halima Ait Malek
Gerisa - Using Foss in Environmental Risk Management for the Coastal Areas of w- Morocco
AGU Fall Meeting Abstracts, Dec 1, 2013
Pilot region of the GeRiSa project (Gestion des risques de l'environnement dans la région... more Pilot region of the GeRiSa project (Gestion des risques de l'environnement dans la région de Safi) is the Sahel of Abda (Morocco) located on the Atlantic coast of western Morocco between the lagoon of Oualidia and the Tensift river basin. It belongs to the Coastal Meseta and forms an erosional platform covered by accumulations of various Meso-cenozoic sediments. Firstly, the study area is characterized by a variety of geomorphological units (depressions, plateaus, cliffs, dunes, estuaries, etc.) and shows a considerable natural richness. Secondly, it illustrates its importance for the national economy by intensive social and economic activities. During the last century, this region has been affected by intensive changes from urban growth, tourism, industrial and commercial development, inducing a considerable vulnerability to natural hazards such as coastal erosion, landslides, flooding, Tsunamis and seismicity. In order to give solutions to these problems, the three-year GeRiSa project with the support of the bilateral Moroccan-German Programme of Scientific Research (PMARS) promoted by the Federal Ministry of Education and Research (BMBF) and the German Aerospace Center (DLR), will implement a knowledge pool and a risk management centre for natural hazards at the Polydisciplinary Faculty of the Cadi Ayyad University of Safi (Morocco). GeRiSa addresses fundamental scientific, environmental and anthropological problems of national importance and social relevance. The aim is a regional real-time geoinformation system with worldwide access via Internet and interdisciplinary dynamic content, enabling the communication between universities, local authorities and public organisation. In this sense, this multidisciplinary project focuses on a synthesis of various works, approaches and collaborations in-progress, previous completed projects and already existing data combining it with new research results. One of the main research targets within this project is the analysis of remote sensing data and its usability for an environmental risk management system. GeRiSa will be a starting point for a risk assessment as well as a warning system for the population of the Safi region and present a source for strategic planning providing guidance for land management and protection of vulnerable areas. To ensure the sustainability of the information system, it will be realized only by FLOSS technology (Free/Libre and Open Source Software). This approach, independent from commercial software, is new in this region and could be considered as a pilot project for Morocco, North African countries or elsewhere. Its application may be possible to treat the same problem in a broader geographic scale.
Pétrologie, géochimie et géochronologie U-Pb d'associations acide-basiques : exemples du SE du Velay (Massif Central français) et de l'Anti-Atlas occidental (Maroc)
Le massif du Velay (SE du MCF) et l'Anti-Atlas occidental (Maroc), ont ete choisis pour discu... more Le massif du Velay (SE du MCF) et l'Anti-Atlas occidental (Maroc), ont ete choisis pour discuter la signification de differences d'âge relevees dans des associations acides et basiques synchrones. Les vaugnerites du Velay se sont mises en place pendant les phases 3 et 4 definies regionalement. Les plus basiques representent un magma relativement primitif et peu evolue et leur caractere lamprophyrique a ete acquis de facon tres precoce soit a partir d'une source mantellique fortement enrichie en elements incompatibles, soit a la faveur d'un processus d'hybridation par du materiel crustal. Les granitoides associes aux vaugnerites sont heterogenes mais tres evolues et ont une signature alcaline. Cette heterogeneite depend soit de la variabilite des sources crustales, soit de l'intervention de processus d'hybridation avec le magma vaugneritique. La geochronologie U-Pb montre que les vaugnerites de Pei Plot et de Loubaresse, syn M3/D3, ont donne des âges, respectivement de 314 ± 3 Ma et 313 ± 3 Ma. La vaugnerite de Meyras, syn M4/D4, a ete datee a 308 ± 6 Ma. Pour le granite de Loubaresse, l'âge a 304 ± 5 Ma (monazite) est geologiquement trop jeune et pourrait s'expliquer par un reequilibrage partiel lors de M4/D4. Les zircons (308 ± 5 Ma) de ce granite resisteraient mieux a la phase M4/D4 que la monazite. Dans le cas de l'Anti-Atlas occidental marocain, la preuve est apportee que des evenements paleoproterozoiques et neoproterozoiques se superposent dans les boutonnieres d'Igherm et du Bas Draa. Le granite de Sidi Said (Bas Draa) et le granite des Ait Makhlouf (Igherm), ont ete dates respectivement a 1987 ± 20 Ma et 2050 ± 6 Ma. Dans le Kerdous, la granodiorite de Tarcouate a donne un âge sur zircon de 583 ± 11 Ma et le granite de Taourgha (Bas Draa) a ete date a 575 ± 2 Ma. Ces derniers âges correspondent a l'episode orogenique panafricain. La gabbro-diorite du meme massif (Tarcouate) a fourni un âge U-Pb de 560 ± 2 Ma, plus jeune que celui de la granodiorite
Eburnian and Panafrican granitoids from the Igherm, Kerdous and Bas-Draa Proterozoic inliers (western Anti-Atlas, Morocco): U-Pb geochronology on zircon
Évolution Plio-Quaternaire de la région de Lakhsass-Guelmim (versant sud de l’Anti-Atlas occidental, Maroc)
Revue Marocaine de Géomorphologie, Apr 13, 2021
in the Safi Area, W- Morocco
All in-text references underlined in blue are linked to publications on ResearchGate, letting you... more All in-text references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately.
IECG 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Corundum-bearing xenoliths in ardeche vaugnerite (French massif Central): Implications for the late carboniferous metamorphism
Remote sensing and geographic information system (GIS) methods were used for karst research in th... more Remote sensing and geographic information system (GIS) methods were used for karst research in the coastal area of Northwest Morocco near the city of Safi in order to identify karst landscapes, to describe karst features and to detect geological structures relevant to karst development. The aim of this study was to investigate the use of different satellite data, such as Landsat, RapidEye and IKONOS imagery, as well as ASTER-and SRTM-derived digital elevation models (DEMs) for the analysis of karst features. Dolines were identified by visual interpretations based on high resolution satellite imagery and aerial photographs. Digital image processing of the satellite data, such as deriving vegetation and water index images, helped to identify regions with relatively higher surface water input, where karstification processes might be more intense than in surrounding areas. ArcGIS-integrated weighted overlay tools were used for this purpose as well by aggregating of morphometric, causal factors (lowest and flattest areas) influencing the susceptibility to higher surface water input. Lineament analysis based on the different satellite data contributed to the detection of near-surface fault and fracture zones with potential influence on dissolution processes in sub-terrain waterways.
Des xénolites à corindon dans une vaugnérite de l'Ardèche (Massif Central français) : implications pour le métamorphisme ardéchois
Xenoliths from the Loubaresse (Ardeche) vaugneritic sill are slivers of the metapelitic country r... more Xenoliths from the Loubaresse (Ardeche) vaugneritic sill are slivers of the metapelitic country rocks. Some of them are partially melted and experienced desilicification. Corundum that appears in the xenoliths is due to early emplacement of the mafic magma, before the LP-HT M3 metamorphic climax.
Pétrologie, géochimie et géochronologie U-Pb d'associations acide-basiques : exemples du SE du Velay (Massif Central français) et de l'Anti-Atlas occidental (Maroc)
Http Www Theses Fr, 1997
Pétrologie-géochimie et géochronologie U-Pb d’associations acides-basiques: exemples du SE du Velay (Massif central francais) et de I’Anti-Atlas occidental (Maroc). Thèse de doctorat 268p. INPL, Nancy, France
Quantitative structure–activity relationship of antitumor and neurotoxic β-carbolines alkaloids: nine harmine derivatives
Research on Chemical Intermediates
Cancer is the worldwide health problem and the most frightening disease of humans. Modification o... more Cancer is the worldwide health problem and the most frightening disease of humans. Modification of natural product lead is an important way to find promising anticancer agents. The β-carboline alkaloids present in medicinal plants have recently drawn attention due to their antitumor properties. Nine harmine derivatives (including harmine) were investigated for their antitumor effects and acute toxicities in mice, and the structure–activity relationship (SAR) was also analyzed by Qi Chen et al. In the present study, density functional theory calculations have been carried out in order to get insight into the structure and property information for this series of molecules. Descriptors such as total energy, gap energy, HOMO and LUMO energies, dipole moment (μ), electronegativity (χ), electron affinity (A), global hardness (η), softness (σ), and ionization potential (I), provide vital information about the activity of nine harmine derivatives. Further, we utilized our recently proposed ...
On the NDWI-image water surfaces, areas with higher groundwater tables or higher soil moisture co... more On the NDWI-image water surfaces, areas with higher groundwater tables or higher soil moisture contents, vegetation with relatively high water content, appear in white.
In the region of Safi, carbonate rocks are significantly influenced by the phenomena of dissoluti... more In the region of Safi, carbonate rocks are significantly influenced by the phenomena of dissolution. Here, cavities and other karst phenomena are the result of the effect of aggressive water on Jurassic-Cretaceous limestones and Plioquaternairy biodetritic limestones, and in particular of the circulation of groundwater. These karst processes are responsible for both underground (caves) and visible surface phenomena (dolines, loss points, collapses ...). The presence of karst phenomena and their continual evolution is a serious problem of soil stability and may require caution in urbanization.
Étude de l’évolution du littoral de la baie d’El Jadida (Maroc) par photo-interprétation
ABSTRACT El Jadida bay, is located on the middle of the Atlantic coast of Morocco (between 33° 15... more ABSTRACT El Jadida bay, is located on the middle of the Atlantic coast of Morocco (between 33° 15’ 00’’ and 33° 21’40’’ North and between 8° 18’ 00’’ and 8° 30’ 00’’ West), constitute a large sandy stock strongly marked by the littoral dynamic. The use of the aerial photographs permit to identify the coast evolution to the Oum Rbia estuary (of 1949 to 1996) and to measure the littoral of the bay El Jadida evolution in medium-term.The results of this diachronic study confirm space and time variability in the littoral of bay evolution with deepening reach’s and others of sedimentation. The coastline variation analysis in medium-term doesn’t give satisfactory results. The only changes were registered at the morphological units of the coast (aerial beach, dunes, ... ). The coastline evolution in the long-term coast is characterized by a strong variability in the Oum Rbia estuary. The period of the most important erosion ranges between 1949 and 1996 with a rate of retreat of 45 m (1.28 m/an). During this period, we can also notice a space variability which results in the existence of two very different sectors: the first is characterized by strong erosion (beach of Right Bank) and the second is characterized by accumulations (sandy arrow of left bank).
Des xénolites à corindon dans une vaugnérite de l'Ardèche (Massif Central français): implications pour le métamorphisme ardéchois
Geosciences, 2014
Remote sensing and geographic information system (GIS) methods were used for karst research in th... more Remote sensing and geographic information system (GIS) methods were used for karst research in the coastal area of Northwest Morocco near the city of Safi in order to identify karst landscapes, to describe karst features and to detect geological structures relevant to karst development. The aim of this study was to investigate the use of different satellite data, such as Landsat, RapidEye and IKONOS imagery, as well as ASTER-and SRTM-derived digital elevation models (DEMs) for the analysis of karst features. Dolines were identified by visual interpretations based on high resolution satellite imagery and aerial photographs. Digital image processing of the satellite data, such as deriving vegetation and water index images, helped to identify regions with relatively higher surface water input, where karstification processes might be more intense than in surrounding areas. ArcGIS-integrated weighted overlay tools were used for this purpose as well by aggregating of morphometric, causal factors (lowest and flattest areas) influencing the susceptibility to higher surface water input. Lineament analysis based on the different satellite data contributed to the detection of near-surface fault and fracture zones with potential influence on dissolution processes in sub-terrain waterways.
Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science, 1998
Quaternaire, 2014
La partie centrale de la plaine du Souss s'étend entre le Haut Atlas au nord et l'Anti-Atlas au s... more La partie centrale de la plaine du Souss s'étend entre le Haut Atlas au nord et l'Anti-Atlas au sud sur 40 km de large. Sa morphologie montre une prédominance des formes héritées, tant dans les régions proximales des piémonts que dans leurs parties distales. Dans les régions proximales subsistent les restes d'au moins trois générations principales de cônes de déjections, plus étendus et plus aplatis sur le piémont anti-atlasique que sur le piémont atlasique, les deux premières étant conservées grâce aux cimentations et encroûtements calcaires. La troisième génération de cônes, cônes adventices, essentiellement limono-sableuse en surface, occupe les parties moyennes et distales. Le système morphogénique majeur est hérité de la transition plio-pléistocène « pliovillafranchien ». De cette époque la plaine conserve les parties apicales encroûtées des cônes et le soubassement carbonaté de sa région centrale, entre El Freija et Ouled Teïma, témoins de l'existence de paléolacs. Ce système déjà consolidé est aussi tectonisé. Dans les régions distales, la vallée actuelle du Souss entaille à peine d'épaisses accumulations carbonatées, restes d'au moins deux générations de paléolacs contemporaines des cônes anciens. Depuis la transition Pléistocène-Holocène, les cônes adventices et le lit majeur de l'oued Souss donnent naissance, en surface, à un modelé fluvio-éolien particulièrement actif.
Earth Sciences, 2014
Located in the urban area, the cliff of Sidi Bouzid and Amouni shows slope instabilities due to f... more Located in the urban area, the cliff of Sidi Bouzid and Amouni shows slope instabilities due to falls and collapse blocks and rotational block gliding. These phenomena form a risk to the economic, social, cultural and environmental issues. Geomorphologic, lithologic and tectonic conditions (ie surfaces of discontinuities such as fractures) combined with the influence of marine abrasion explain the increased instability of this part of the Sahel-Safi. This ongoing slope failure is a handicap for coastal development projects. The activity of these phenomena-more or less remarkable-is monitored by the GIS integrated observation and evaluation of field, aerial and satellite data, allowing to establish synthesis maps that give a risk assessment in this sector. Digital Elevation Model (ASTER_GDEM2) is used for the morphometric analysis of this area and as a base for the weighted overlay of causal / preparatory morphometric factors influencing the slope stability.
Uploads
Papers by Halima Ait Malek