Contrasted piedmont developments
Date
2008
Authors
Twidale, C.
Bourne, J.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Chikei/Transactions, Japanese Geomorphological Union, 2008; 29(2):131-147
Statement of Responsibility
Twidale C. R. and Bourne J. A.
Conference Name
Abstract
The piedmont angle is basically due to intense weathering first low on the hillslope and then to weathering and erosion in the scarp-foot zone so created. Structural factors contribute but weathering and erosion have created scarp-foot nicks and depressions in homogenous bedrock. Once developed such basal erosion produces and maintains steep slopes and scarp recession. Coarse weathered debris induces gully gravure, and protective veneer and false cuestas. Where the country rock weathers to fines the piedmont angle is abrupt but simple. However, slope morphology varies with regional factors. On northern Eyre Peninsula, for instance, the stabilisation of the plains by widespread calcrete accumulations, and the insulation of the area against exoreic surface drainage by coastal barriers, together have negated and retarded the more usual slope developments.