(Article of periodic en Anglais - 2012)

Document title

Holocene and Anthropocene landscape change : Arroyo Formation on Santa Cruz Island, California

Authors(s) and Affiliation(s)

PERROY R.L. (1) ; BOOKHAGEN B. (2) ; CHADWICK O.A. (2) ; HOWARTH J.T. (3) ;
(1) Dep. of Geography and Earth Science, Univ. of Wisconsin, La Crosse, ETATS-UNIS
(2) Dep. of Geography, Univ. of California, Santa Barbara, ETATS-UNIS
(3) Dep. of Geography, College, Middlebury, ETATS-UNIS


Within the Pozo watershed environmental changes were assessed using a combination of cosmogenic radionuclide inventories, midden and marine-shell deposits, relict soil properties, airborne and ground-based light detection and ranging (lidar) data, ranching artifacts, and historic records. Catchment-mean erosion rates from cosmogenic radionuclide measurements indicate that presettlement rates were less than 0.08 mm/year, whereas lidar-derived measurements of historic gully erosion produce estimates almost thirty times higher. Topographic measurements since 2005 indicate that the active channel of the Pozo watershed is aggrading. The AA. argue that accelerated sedimentation due to overgrazing, and an unusually large 1878 rainstorm event, set the stage for arroyo formation in the Pozo watershed between 1875 and 1886. They hypothesize that even in the absence of modern human disturbance, downcutting would have occurred due to intrinsic hillslope stability thresholds


Article of periodic

published at : Annals of the Association of American Geographers / ISSN 0004-5608 / CODEN AAAGAK

Editor : Association of American Geographers, Washington, DC - ETATS-UNIS (1911)

Millesime : 2012, vol. 102, no6 [pp. 1229-1250]

Bibliographic references : 3 p.

Collation : 12 fig., 3 tabl.




Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1080/00045608.2012.715054

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