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2019 | OriginalPaper | Buchkapitel

13. The Base-Level Effect

verfasst von : Dan Bowman

Erschienen in: Principles of Alluvial Fan Morphology

Verlag: Springer Netherlands

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Abstract

Base-level is an imaginary horizontal surface to which the fluvial system strives to erode. A distinction is made between a terminal and a local base-level. The base-level of many alluvial fans is an inland, local, intermountain basin. Its margins, which are the typical site of fan deposition, are not base-level loci. A falling base-level will trigger entrenchment only if the new exposed area will be steeper than the threshold gradient for erosion. Intersection points that are the end spot of an entrenched fan segment do not function as a base-level. Profile shortening by toe trimming causes headward entrenchment although not a base-level drop.

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Metadaten
Titel
The Base-Level Effect
verfasst von
Dan Bowman
Copyright-Jahr
2019
Verlag
Springer Netherlands
DOI
https://doi.org/10.1007/978-94-024-1558-2_13