Mahjoub Himi

Universitat de Barcelona

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A. Casas

Universitat de Barcelona

R. Lovera

Universitat de Barcelona

L. Rivero

Universitat de Barcelona

A. Sendrós

Universitat de Barcelona

Josefina C. Tapias

Universitat de Barcelona

A. Urruela

Universitat de Barcelona

Mohammed Elgettafi

Mohamed I University

Sara Benabdelouahab

Universitat de Barcelona

Adil Salhi

Abdelmalek Essaâdi University

Abdennabi El Mandour

Cadi Ayyad University

Cooperative Institutions

Universitat de Barcelona

Abdelmalek Essaâdi University

Cadi Ayyad University

Consejo Superior de Investigaciones Científicas

Mohamed I University

Geociencias Barcelona

Centre National de la Recherche Scientifique

Université Moulay Ismail de Meknes

Terra

Universitat Politècnica de Catalunya

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Fonctionnement hydrogéologique du bassin de la Bahira (Maroc central) : apport de l’analyse des données géologiques et gravimétriques

Canadian Journal of Earth Sciences (2014)

Morad Karroum Abdennabi El Mandour Driss Khattach Albert Cassas Mahjoub Himi

Cette etude, basee sur l’analyse des donnees gravimetriques, a pour but d’ameliorer la connaissance des structures geologiques de la plaine de la Bahira (Maroc central) qui controlent l’ecoulement ...

10.1139/cjes-2013-0130

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Citations (9)

Enhanced Groundwater Protection and Management Using Gravity and Geoelectrical Data (Valls Basin, Spain)

Water (2023)

A. Sendrós Mahjoub Himi L. Rivero R. Lovera A. Urruela

The basis for the protection and prevention of groundwater pollution lies in the accurate assessment of vulnerability in terms of the exposure of groundwater bodies to contaminants before they are potentially discharged into the environment. The vulnerability assessment consists of calculating the ease with which pollutants can reach the aquifer from the surface through the vadose zone, which effectively reduces the pollutant load when the transit time is long. Index methods are mostly used, as they are based on input data that are readily available, easy to implement and interpret, and which are simple and practical. However, there are also limitations, as some methods are somewhat subjective and provide only a qualitative approximation. This case study aims to develop a methodology that can quantitively estimate the hydrogeological parameters of the aquifer formations of the Valls basin using geophysical methods and the Dar Zarrouk parameters. The specific treatment carried out on data from gravity stations and vertical electric soundings, supported by the available well data, allows for the delineation of the most favourable areas for the exploitation of groundwater resources (higher hydraulic transmissivity) and the areas most susceptible to pollution (with a shorter transit time) on a regional scale. Geophysical methods have proved useful, sustainably providing valuable information without the need to drill new boreholes that could act as preferential pathways for pollutants into the aquifer.

10.3390/w15234130

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Citations (1)

Valles Half-Graben (NE Spain), a Preliminary Regional Geothermal Model

A. Llobet L. Rivero A. Sendrós Mahjoub Himi A. Urruela

Summary The Vallès basin is located in the NE area of the Iberian Peninsula. In this area, some sources of thermal water are known and used since ancient times. These upwellings indicate that there are hot waters at a certain depth, and maybe, that could be exploited. Not much depth geological information is avalaibe in this area but the hydraulic regime sems controlled by the tectonic configuration and the sedimentary material in the subsurface develops aquifers capable to redistribute fluids, solutes and heat. This preliminary study tries to deduce the possible origin of these waters and the comparison with other similar better known areas.

Peninsula

Geothermal exploration

10.3997/2214-4609.202120056

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Citations (0)

Gravimetry Contribution to the Study of the Bahira Aquifer (Morocco) - Hydrogeological Implication

Proceedings (2016)

Mohammed Elgettafi Morad Karroum Abdenabi Elmandour Mahjoub Himi A. Casas

This study, based on analysis of gravity data, is aimed to improve the knowledge of the geological structures of the plain of Bahira (Central Morocco) that control the groundwater flow through the basin. A residual gravity anomaly map was first calculated from Bouguer anomaly map by subtracting a regional trend. This map provides information on the variation of the rock densities under the plain of the Bahira. Several gravity highs and lows which indicate the presence of horts and grabens structures in the basin basement have been highlighted. The superposition of the piezometric surface map of the plain of the Bahira and the residual anomaly map showed that groundwater flows from recharge areas of Ganntour, Jbilet, and Rehamna to closed depressions of Sed El Mejnoun and Lake Zima. In order to delineate the main faults contributing to the structure of the study area, horizontal gradient and upward continuation techniques have been applied to determine gravity lineaments that represent the location of the density contrasts limits. Three families of fractures that control groundwater flow have been highlighted.

Lineament

Gravimetry

Basement

Anomaly (physics)

10.3997/2214-4609.201602072

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Citations (2)

Géométrie de l’aquifère du Haouz oriental et Tassaout amont, Maroc occidental: approche géophysique et hydrogéologique

Hydrological Sciences Journal (2014)

Samia Rochdane Abdennabi El Mandour Mohammed Jaffal Mahjoub Himi A. Casas

RésuméCette étude vise à améliorer la connaissance de la géométrie et de l'hydrogéologie de l'aquifère du Haouz Oriental et du domaine de la Tassaout Amont en se basant sur l'analyse et l'interprétation des données de forages, de gravimétrie, de sismique réflexion et de piézométrie. L'examen de la carte gravimétrique de l'anomalie de Bouguer révèle l'existence d'un gradient régional souligné par des valeurs croissantes du Sud-Est au Nord-Ouest. Ce gradient a été déterminé puis soustrait des données initiales, ce qui a permis d'obtenir une carte résiduelle sur laquelle les anomalies sont plus clairement mises en évidence. Ces anomalies reflètent en général les zones d'affleurement du socle et les variations d'épaisseur de la couverture sédimentaire à l'échelle de la zone d'étude. Le profil de la sismique réflexion et le traitement des données de forages profonds confirment les résultats de la gravimétrie et montrent que la région est formée par un horst qui correspond aux affleurements du socle des Jebilets au nord du bassin du Haouz et une zone subsidente où la couverture est très développée au Sud de la plaine du Haouz. A ce niveau, l'épaisseur importante de la couverture favorise l'accumulation des eaux et assure l'alimentation du réservoir. La remontée du socle au Nord de la plaine impose une ligne de partage des eaux souterraines avec deux sens d'écoulement.

10.1080/02626667.2014.979174

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Citations (13)

δ34S, δ18O, and δ2H-δ18O as an Approach for Settling the Question of Groundwater Salinization in Neogene Basins: The North of Morocco in Focus

Water (2022)

Mohammed Elgettafi Malak Elmeknassi Abdenabi Elmandour Mahjoub Himi Juan M. Lorenzo

Neogene plains around the Mediterranean basin are characterized by considerable groundwater salinization. Some studies have misidentified seawater intrusion as the main source of salinity. Across northern Morocco, we gathered δ18OSO4 and δ34SSO4 data from coastal and inland aquifers, Messinian marls, and volcanic products. Differences in the isotopic composition between Messinian marls and some groundwater in all aquifer samples indicate that salinization in groundwater is a consequence of dissolution of Messinian evaporite deposits; nevertheless, modern agriculture and wastewater strongly influence depletion in levels of δ34SSO4. Our novel approach enables effective investigation of processes governing salinity in Neogene basins to support more informed water resource management and governance.

Neogene

Marl

10.3390/w14213404

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Citations (4)

Frequency Domain Electromagnetic mapping for delineating subsurface structures related to the historical port of Emporiae

Archaeological Prospection (2021)

A. Casas Pere Castanyer Mahjoub Himi R. Lovera L. Rivero

Abstract In recent years, there has been a growing interest in the application of geophysical methods to reconstruct the palaeo‐landscapes of sites of special historical interest in support of the planning of archaeological researches. Given the extent of the surface to be investigated, electromagnetic methods have proven to be very suitable for their speed, resolution and versatility for this objective. In particular, coastal areas of the Mediterranean have undergone significant changes in the position of the coastline, because of changes in sea level and sediment inputs that have covered natural harbours used for the establishing colonies. In this paper, we present the results of a geophysical survey conducted using frequency‐domain electromagnetic (FDEM) method carried out to get the geometry of a coastal area near to Emporiae (NE, Spain), which was supposed to form a natural port that was used by Greeks and Romans for its first colonial settlements on the Iberian Peninsula. The results obtained from a dense network of apparent conductivity measurements, supported punctually by other geophysical data (VES and ERT) and boreholes, has allowed us to define the geometry of the basin and confirm the hypotheses of the existence of harbour buried under the coastal and alluvial sediments in the bay close to the remains from Greek and Roman times.

Geophysical survey

Peninsula

Human settlement

Exploration geophysics

10.1002/arp.1834

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Citations (3)

Frequency-Domain Electromagnetic Mapping of an Abandoned Waste Disposal Site: A Case in Sardinia (Italy)

Remote Sensing (2022)

Gian Piero Deidda Mahjoub Himi Ilaria Barone Giorgio Cassiani A. Casas

For decades, bad practices in municipal and industrial waste management have had negative environmental impacts, generating high health risks for people and the environment. The use of badly designed, not engineered, and not well-operated landfills has, around the world, produced a large number of potentially contaminated sites, for which there are urgent needs to assess the actual risk and to proceed, in case, with reclamation activities. One of these sites, an abandoned waste disposal site located near a Site of Community Importance on the central-eastern coast of Sardinia (Italy), is the subject of the case history described in this work. As a part of a multi-method geophysical characterisation, a frequency-domain electromagnetic (FDEM) mapping survey was carried out with the specific aim of detecting the presence of buried materials (waste) and of delineating the lateral extent of the landfill by identifying the electrical conductivity anomalies produced, for the most part, by the conductive waste fill. Using an EM31 device in the vertical-dipole configuration, at a height of 0.9 m above the ground, both quadrature and in-phase electromagnetic responses were collected over a 7-hectare area with elevation varying between 6 m and 2.8 m above sea level. After removing the measurements identified as data coming from any recognisable surface man-made features within the survey area or near its perimeter, the filtered quadrature response (expressed as apparent conductivity) ranged from 5.5 mS/m to about 188.6 mS/m. All values are beyond the low induction number (LIN) condition and valid for the classical EM31 mapping, thus requiring advanced data processing. To obtain undistorted, meaningful, and interpretable high-resolution maps, measured data have been processed to correct the bias, introduced by the nonlinearity of the device, as a function of height above ground and the topography. The comparative analysis of the apparent conductivity map, obtained by the properly processed EM31 data and some aerial photos that clearly documented the site history, has allowed unequivocal delineation of the landfill extent, in good agreement with the results obtained with other geophysical methods (not described in this paper) and with the ground truthing data provided by three boreholes, which were core-drilled at the end of the study at three locations selected on the basis of the apparent conductivity map.

10.3390/rs14040878

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Citations (8)

Electrical resistivity tomography and induced polarisation techniques applied to the identifiaction of gypsum rocks

A. Guinea Elisabet Playà Pous Lluís Rivero Marginedas Mahjoub Himi

Electrical Resistivity Tomography

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Conceptual Model for Exploring Geothermal Resources in La Seva Basin (NE Spain) from Integrated Geophysical Data

Proceedings (2017)

M. Torrens R. Lovera Mahjoub Himi A. Sendrós Josefina C. Tapias

Summary An integrated geophysical interpretation has been conducted around La Selva basin that show strong geochemical and geologic evidences of hydrothermal with the intent of define a conceptual model for exploration of low and intermediate enthalpy geothermal resources. The geophysical data involved in this study consist of gravity, magnetic and geoelectrical, supplemented by geological and hydrogeochemical information. The interpretation of gravity anomalies has been useful for defining the main structural discontinuities, magnetic map show the existence of several anomalies related to mafic intrusions while geoelectrical prospecting let delineate more conductive areas which could correspond to an increase in thermal fluid circulation. The results obtained by the different geophysical methods are in good agreement and allows defining a reliable geostructural model of the subsurface of the studied area.

Classification of discontinuities

Geothermal exploration

10.3997/2214-4609.201701989

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Citations (1)