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(Article of periodic en Anglais - 2012)

Document title

Strong seasonality in sand loading and resulting feedbacks on sediment transport, bed texture, and channel planform at Mount Pinatubo, Philippines

Authors(s) and Affiliation(s)

GRAN K.B. (1) ;
(1) Dep. of Geological Sciences, Univ. of Minnesota, Duluth, ETATS-UNIS

Abstract

The effects of episodic sand loading are explored through flow, grain size, and bedload transport measurements on the Pasig-Potrero River, a sediment-rich channel draining Mount Pinatubo, Philippines. Sand loading on the Pasig-Potrero River is highly seasonal, and channel adjustments between seasons are dramatic. During the fall 2009 seasonal transition, 7.6 km of channel incised and armored, carving a 2-3 m deep channel on the upper alluvial fan. Bedload transport rates measured in the August 2009 rainy season were over 4 orders of magnitude greater than gravel-bedded dry-season channels surveyed in January 2010, despite having similar shear stress and unit discharge conditions. Within dry-season incised channels, bed armoring is rapid, leading to an abrupt gravel-sand transition. Bedload transport rates adjust more slowly, creating a lag between armoring and commensurate reductions in transport. Seasonal channel incision occurred in steps, aided by lateral migration into sand-rich banks

Source

Article of periodic

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

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

Millesime : 2012, vol. 37, no9 [pp. 1012-1022]

Bibliographic references : 1 p.

Collation : 8 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.3241

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2013
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