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Evapotranspiration from a bulrush-dominated wetland in the Klamath Basin, Oregon

Journal of the American Water Resources Association

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Abstract

Growing-season evapotranspiration and surface energy and water balances were investigated for an extensive, bulrush-dominated wetland in the Upper Klamath National Wildlife Refuge of south-central Oregon, a semi-arid region with competing demands for scarce water resources. Turbulent fluxes of sensible and latent heat were measured by eddy covariance for 1.2 to 1.9 days during each of four site visits during late-May to mid-October 1997. Mean daytime latent heat flux and the Bowen ratio ranged from 148 to 178 W m-2 and from 0.38 to 0.51, respectively, during late May, mid-July, and late August site visits. By mid-October, when the plant canopy had senesced, daytime latent heat flux and the Bowen ratio averaged 46 W m-2 and 2.8, respectively. An hourly Penman-Monteith (PM) model that was fitted to the surface-flux data provided values for the surface resistance to water-vapor diffusion that ranged from 78 s m-1 during late August to 206 s m-1 during mid-October. Similarly, a Priestley-Taylor (PT) model provided values for the PT multiplier (??) that ranged from 0.96 during late August to 0.37 during mid-October. The PM and PT models predicted evapotranspiration totals of 560 and 480 mm, respectively, for May 28 to October 12, 1997.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Evapotranspiration from a bulrush-dominated wetland in the Klamath Basin, Oregon
Series title:
Journal of the American Water Resources Association
Volume
36
Issue:
6
Year Published:
2000
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of the American Water Resources Association
First page:
1309
Last page:
1320