Journal ArticleDOI
The role of rock surface hardness and internal moisture in tafoni development in sandstone
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In this article, 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.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. Copyright © 2011 John Wiley & Sons, Ltd.read more
Citations
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Journal ArticleDOI
Mechanical weathering and rock erosion by climate-dependent subcritical cracking
TL;DR: In this paper, a fracture mechanics framework for conceptualizing mechanical rock breakdown and consequent regolith production and erosion on the surface of Earth and other terrestrial bodies is presented, which explicitly establishes for the first time that all mechanical weathering in most rock types likely progresses by climate-dependent subcritical cracking under virtually all Earth surface and near surface environmental conditions.
Journal ArticleDOI
Sediment source fingerprinting: benchmarking recent outputs, remaining challenges and emerging themes
Adrian L. Collins,Martin S. A. Blackwell,Pascal Boeckx,Charlotte-Anne Chivers,Charlotte-Anne Chivers,Monica B. Emelko,Olivier Evrard,Ian D L Foster,Allen C. Gellis,Hamid Gholami,Steve J. Granger,Paul Harris,Arthur J. Horowitz,J. Patrick Laceby,Núria Martínez-Carreras,Jean Paolo Gomes Minella,Lisa Mol,Kazem Nosrati,Simon Pulley,Uldis Silins,Yuri Jacques Agra Bezerra da Silva,Micheal Stone,Tales Tiecher,Hari Ram Upadhayay,Yusheng Zhang +24 more
TL;DR: This review of sediment source fingerprinting assesses the current state-of-the-art, remaining challenges and emerging themes and combines inputs from international scientists either with track records in the approach or with expertise relevant to progressing the science.
Journal ArticleDOI
Technology and geomorphology: Are improvements in data collection techniques transforming geomorphic science?
TL;DR: In this paper, the authors consider the relationship between science, technology and the development of geomorphological tools and techniques, and critically assesses what impact new technologies are having on geomorphology.
Journal ArticleDOI
Origin of honeycombs: Testing the hydraulic and case hardening hypotheses
TL;DR: In this paper, two commonly assumed formation hypotheses, hydraulic and case hardening, were tested to elucidate the origin of honeycombs on sandstone outcrops in a humid climate.
References
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Journal ArticleDOI
Rapid least-squares inversion of apparent resistivity pseudosections by a quasi-Newton method1
M.H. Loke,R. D. Barker +1 more
TL;DR: In this paper, a smoothness-constrained least-squares method was used for the interpretation of data from resistivity tomography surveys on an 80486DX microcomputer.
Rapid least-squared inversion of apparent resisitivity pseudosections by a quasi-Newton method
M. H. Loke,R. D. Barker +1 more
TL;DR: In this article, a smoothness-constrained least-squares method was used for the interpretation of data from resistivity tomography surveys on an 80486DX microcomputer.
Proceedings ArticleDOI
Rapid least-squares inversion of apparent resistivity pseudosections
M. H. Loke,R. D. Barker +1 more
TL;DR: A fast iterative inversion technique for the interpretation of data from resistivity imaging surveys using a microcomputer has been developed in this article, which is based on the smoothness-constrained least-squares method and it produces a two-dimensional subsurface model directly from the apparent resistivity pseudosection.
Journal ArticleDOI
A Reconsideration of Personal Boundaries in Space-Time
TL;DR: In this article, a multivariate model is proposed which views geographical variability in weathering as a function of synergistic biological, chemical, and physical processes that are controlled by factors that vary at the microscopic weathering boundary layer.
Journal ArticleDOI
The use of the Schmidt Hammer and Equotip for rock hardness assessment in geomorphology and heritage science: a comparative analysis
TL;DR: In this article, the capabilities of two types of Schmidt hammers (Classic N type and Silver Schmidt BL type) and two Equotip devices (standard type D and Piccolo) for investigating rock hardness in relation to rock weathering on various types of sandstone and limestone, including basalt and dolerite.