Geomorphic transport laws for predicting landscape form and dynamics

William E. Dietrich, Dino G. Bellugi, Leonard S. Sklar, Jonathan D. Stock, Arjun Heimsath, Joshua J. Roering

Research output: Chapter in Book/Report/Conference proceedingChapter

315 Scopus citations

Abstract

A geomorphic transport law is a mathematical statement derived from a physical principle or mechanism, which expresses the mass flux or erosion caused by one or more processes in a manner that: 1) can be parameterized from field measurements, 2) can be tested in physical models, and 3) can be applied over geo-morphically significant spatial and temporal scales. Such laws are a compromise between physics-based theory that requires extensive information about materials and their interactions, which may be hard to quantify across real landscapes, and rules-based approaches, which cannot be tested directly but only can be used in models to see if the model outcomes match some expected or observed state. We propose that landscape evolution modeling can be broadly categorized into detailed, apparent, statistical and essential realism models and it is the latter, concerned with explaining mechanistically the essential morphodynamic features of a landscape, in which geomorphic transport laws are most effectively applied. A limited number of studies have provided verification and parameterization of geomorphic transport laws for: linear slope-dependent transport, non-linear transport due to dilational disturbance of soil, soil production from bedrock, and river incision into bedrock. Field parameterized geomorphic transport laws, however, are lacking for many processes including landslides, debris flows, surface wash, and glacial scour. We propose the use of high- resolution topography, as initial conditions, in landscape evolution models and explore the applicability of locally parameterized geomorphic transport laws in explaining hillslope morphology in the Oregon Coast Range. This modeling reveals unexpected morphodynamics, suggesting that the use of real landscapes with geomorphic transport laws may provide new insights about the linkages between process and form.

Original languageEnglish (US)
Title of host publicationPrediction in Geomorphology, 2003
PublisherBlackwell Publishing Ltd
Pages103-132
Number of pages30
Volume135
ISBN (Electronic)9781118668559
ISBN (Print)9780875909936
DOIs
StatePublished - Jan 1 2003
Externally publishedYes

Publication series

NameGeophysical Monograph Series
Volume135
ISSN (Print)0065-8448
ISSN (Electronic)2328-8779

ASJC Scopus subject areas

  • Geophysics

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