Contribution of geophysical techniques, especially of georadar, to mapping underground cavities withim the medina of Beni-Mellal, Morocco
type: Dataset
description: This research aims at the contribution of geophysical methods in detecting and mapping underground cavities of the Medina of Beni-Mellal. It is considered as a part of the rehabilitation project of this Medina, It is comes to complete the initiative of the Urban Agency of Beni-Mellal and the local as well as the national authorities. The methodology implemented is the one proposed in the technical guide proposed by Le Laboratoire Central Des Ponts et Chaussées De Nantes (2004). The first chapter raises the problems of cavities, called "Khefs" in relation with the history and geography of the Medina. The second chapter deals with the preliminary stages of study that concern the application of the geophysics. A critical approach of the previous reports and the visits of the geological outcrops and caves have changed the claimed assumptions about the origin and the nature of the cavities. In contrast to what has often been assumed, there can't be any cavity naturally formed and linked to Karstification. In fact these cavities are the result of men digging detritic materials to extract soil needed for building the medina itself. As a result of this wrong exploitation they left behind cavities in forms of rooms and pillars. Besides, these cavities were subject to degradation due to the human activities. The third chapter states the choice of the geophysical methods implemented, and presents the result of three of them. The seismic refraction is not recommended, while the electrical tomography and near-field electromagnetism are. Seven examples of 2D tomography profiles were presented and which clearly showed the presence of expected and resistant anomalies: Their roof is located between 0.50 m and 1.50 m deep and their lateral extension is less than 5 m. Five profiles and two electromagnetic maps demonstrate the ability to map geological variations of the surface and the sensitivity to the vertical contact located between the emptiness and the detritic material. The four…
landing page: https://theses.hal.science/tel-00812038
identifier: NNT: 2008PA066044
keyword: amenagement-urbain
keyword: carrieres-souterraines
keyword: cavites
keyword: cavities
keyword: electrical-tomography
keyword: electromagnetic-close-field
keyword: electromagnetisme-en-champ-proche
keyword: geological-radar
keyword: geophysics
keyword: geophysique
keyword: infoeu-reposemanticsdoctoralthesis
keyword: physphysphys-geo-phphysics-physicsphysics-physicsgeophysics-physicsgeo-ph
keyword: quarries
keyword: radar-geologique
keyword: sdemcgenvironmental-sciencesglobal-changes
keyword: sdustugpsciences-of-the-universe-physicsearth-sciencesgeophysics-physicsgeo-ph
keyword: seismic
keyword: sismique
keyword: slingram
keyword: theses
keyword: tomographie-electrique
keyword: urban-development
issued: 2026-05-11T13:13:46.903350
modified: 2026-05-11T13:13:46.903355
language: fr
contact point: Organization
  fn: CCSD

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type: Agent

Contribution of geophysical techniques, especially of georadar, to mapping underground cavities withim the medina of Beni-Mellal, Morocco
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00812038
issued: 2026-05-11T13:13:46.921302
modified: 2026-05-11T13:13:46.865062