Spatial patterns of March and September streamflow trends in Pacific Northwest streams, 1958-2008

The geographical analysis of water problems

Auteur(s) et Affiliation(s)

CHANG, H.

Dep. of Geography, State Univ., Portland, Etats-Unis

Inst. for Sustainable Solutions, State Univ., Portland, Etats-Unis

JUNG, I.W.

Dep. of Geography, State Univ., Portland, Etats-Unis

Inst. for Sustainable Solutions, State Univ., Portland, Etats-Unis

STEELE, M.

Dep. of Geography, State Univ., Portland, Etats-Unis

GANNETT, M.

U.S. Geological Survey, Oregon Water Science Center, Portland, Etats-Unis

WENTZ, E.A.

School of Geographical Sciences and Urban Planning, Arizona State Univ., Tempe, Etats-Unis

Description :
This study detects significant negative trends in September absolute streamflow in a majority of 68 stream-gauging stations located on unregulated streams in the pacific Northwest (PNW) from 1958 to 2008. The geographically weighted regression (GWR) model results show spatial gradients of local R2 values with consistently higher local R2 values in the northern Cascades. This finding illustrates that different hydrologic landscape factors, such as geology and seasonal distribution of precipitation, also influence streamflow trends in the PNW. In addition, the spatial analysis model results show that considering various geographic factors help clarify the dynamics of streamflow trends over a large geographical area, supporting a spatial analysis approach over a spatial ordinary least squares (OLS)-estimated regression models for predicting streamflow trends.

Type de document :
Article de monographie

Source :
Geographical analysis, issn : 0016-7363, 2012, vol. 44, n°. 3, p. 177-201, nombre de pages : 25, Références bibliographiques : 2 p.

Date :
2012

Editeur :
Pays édition : Etats-Unis, Columbus, OH, Ohio State University Press

Langue :
Anglais