Universität zu Köln

Herzog, Manuel, Kanig, Maximilian and Bubenzer, Olaf (2019). Electrical resistivity tomography and forward modelling in hyper-arid environments - A case study from Erg Chebbi, Southeast Morocco. Z. Geomorphol., 62. S. 119 - 136. STUTTGART: GEBRUDER BORNTRAEGER. ISSN 0372-8854

Full text not available from this repository.

Abstract

Electrical Resistivity Tomography (ERT), a non-destructive geophysical method, which aims at detecting sediment conductivity and its distribution including e.g. stratification, has been used in manifold research topics, for example in sedimentology, hydrology, and geoarchaeology. However, ERT is mostly used in humid to semi-arid environments, where at least some underground moisture guarantees reliable conductivity. In this paper, for the first time, the results of ERT measurements are presented in combination with geomorphological and sedimentological investigations in a dune-interdune system in a hyper-arid environment. Erg Chebbi in South-East Morocco and its environment is characterized by very scarce precipitation and high evaporation rates, which presents significant methodological challenges. Reliable results were generated, displaying a distinct border between a dune body and underlying playa sediments. In the latter, a thin calcareous crust, found by drillings, was not displayed by ERT data due to their spacial depth resolution. To account for this, robust resistivity forward modelling was used to explain contradicting ERT data and corresponding sedimentological results. Major advantages and drawbacks concerning measurement set ups, modelling and interpretation arc finally discussed. In conclusion, the use of ERT in a hyper-arid environment proved to be a successful and reliable tool if mentioned precautions (in field validation, suitable array layout) are taken into account.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Herzog, Manuel UNSPECIFIED UNSPECIFIED UNSPECIFIED Kanig, Maximilian UNSPECIFIED UNSPECIFIED UNSPECIFIED Bubenzer, Olaf UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-160877
DOI:	10.1127/zfg_suppl/2019/0529
Journal or Publication Title:	Z. Geomorphol.
Volume:	62
Page Range:	S. 119 - 136
Date:	2019
Publisher:	GEBRUDER BORNTRAEGER
Place of Publication:	STUTTGART
ISSN:	0372-8854
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SOIL-WATER CONTENT; SEDIMENTARY STRUCTURE; CONTAMINATION; GEOPHYSICS; DYNAMICS; DUNES; ZONES; AREA; GPR Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16087