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(Article of periodic en Anglais - 2009)

Document title

Bank-collapse processes in a valley-bottom gully, western Iowa

Authors(s) and Affiliation(s)

THOMAS J.T. (1) ; IVERSON N.R. (1) ; BURKART M.R. (1) ;
(1) Dep. of Geological and Atmospheric Sciences, Iowa State Univ., Ames, ETATS-UNIS

Abstract

Widening and bank-slope reduction of a valley-bottom gully in western Iowa was correlated to increasing subsurface flow over a 36-year period. To study bank collapse at this gully, the AA. measured rainfall, air temperature, hydraulic head near the banks and bank movement nearly continuously over a 2-year period. Bank movement was commonly correlated to rainfall or snowmelt and associated head increases in the banks. If the banks are modelled as a two-dimensional slab with an adjacent tension crack partly filled with water, measured heads were sufficient to cause bank failures through reduction of frictional support at the base of the slab. Deformation of the banks by heaving and thawing during winter may weaken them and prime them for failure during spring rains and snowmelt, when the frequency of mass-wasting events is highest

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2009, vol. 34, no1 [pp. 109-122]

Bibliographic references : 1 p.

Collation : 11 fig., 1 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.1699

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2009
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