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(Article of periodic en Anglais - 2012)

Document title

Multitemporal ALSM change detection, sediment delivery, and process mapping at an active earthflow

Authors(s) and Affiliation(s)

DELONG S.B. (1 2) ; PRENTICE C.S. (2) ; HILLEY G.E. (3) ; EBERT Y. (3) ;
(1) Biosphere2, Univ. of Arizona, Tucson, ETATS-UNIS
(2) MS 977 US Geological Survey, Menlo Park, ETATS-UNIS
(3) Univ., Stanford, ETATS-UNIS

Abstract

At Mill Gulch in northern California, USA, an active earthflow was surveyed in 2003 and 2007 by airborne laser swath mapping (ALSM), enabling meter-scale quantification of landscape change. The AA. calculate four-year volumetric flux from the earthflow and compare it to long-term catchment average erosion rates from cosmogenic radionuclide inventories from adjacent watersheds. They also present detailed maps of changing features on the earthflow, from which they can derive velocity estimates and infer dominant process. These measurements rely on proper digital elevation model (DEM) generation and a simple surface-matching technique to align the multitemporal data in a manner that eliminates systematic error in either dataset. By making the conservative assumption that these features were the dominant contributor of sediment flux from the entire Mill Gulch drainage basin during this time interval, they calculate a minimum catchment-averaged erosion rate. This study re-affirms the importance of mass wasting processes in the sediment budgets of uplifting weak lithologies

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, no3 [pp. 262-272]

Bibliographic references : 43 ref.

Collation : 9 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.2234

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2012
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