Hydrologist, U.S. Geological Survey, Water Resources Division, 1201 Pacific Avenue, Suite 600, Tacoma, Washington 98402 (E-Mail: email@example.com).
EVAPOTRANSPIRATION FROM A BULRUSH-DOMINATED WETLAND IN THE KLAMATH BASIN, OREGON1
Article first published online: 8 JUN 2007
JAWRA Journal of the American Water Resources Association
Volume 36, Issue 6, pages 1309–1320, December 2000
How to Cite
Bidlake, W. R. (2000), EVAPOTRANSPIRATION FROM A BULRUSH-DOMINATED WETLAND IN THE KLAMATH BASIN, OREGON. JAWRA Journal of the American Water Resources Association, 36: 1309–1320. doi: 10.1111/j.1752-1688.2000.tb05728.x
Paper No. 00018 of the Journal of the American Water Resources Association.Discussions are open until August 1, 2001.
- Issue published online: 8 JUN 2007
- Article first published online: 8 JUN 2007
- surface energy balance;
- water balance;
- eddy covariance;
- Priestley-Taylor equation;
- Penman-Monteith equation
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 (a) 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.