The role of rock surface hardness and internal moisture in tafoni development in sandstone

Mol, Lisa ORCID: https://orcid.org/0000-0001-5272-3671 and Viles, Heather 2012. The role of rock surface hardness and internal moisture in tafoni development in sandstone. Earth Surface Processes and Landforms 37 (3) , pp. 301-314. 10.1002/esp.2252

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Abstract

The development of cavernous weathering features such as tafoni remains poorly understood. In particular, the roles played by internal moisture and case hardening remain unclear. In this study, Electric Resistivity Tomography (ERT) has been used to map moisture distribution within inner walls of tafoni developed in sandstone, and an Equotip device used to measure rock surface hardness as a proxy measure of the degree of weathering and case hardening. Seven large tafoni in the Golden Gate Highlands National Park (South Africa), varying in size and degree of development have been monitored. A dynamic relationship between surface hardness, degree of weathering and internal moisture regimes has been found. We propose a new conceptual model which illustrates the complex interaction between case hardening and internal moisture and suggests a new direction for cavernous weathering research.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Subjects:	G Geography. Anthropology. Recreation > GB Physical geography
Uncontrolled Keywords:	sandstone; tafoni; ERT; rock surface hardness; temperature; exposure
Publisher:	Wiley-Blackwell
ISSN:	0197-9337
Last Modified:	28 Oct 2022 08:57
URI:	https://orca.cardiff.ac.uk/id/eprint/72747

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