http://www.cnr.it/ontology/cnr/individuo/prodotto/ID13232

Surface renewal estimation of pasture evapotranspiration (Articolo in rivista)

Type

Label

Surface renewal estimation of pasture evapotranspiration (Articolo in rivista) (literal)

Anno

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

Alternative label

R. L. Snyder; D. Spano; P. Duce; K. T. Paw U; M. Rivera (2008)
Surface renewal estimation of pasture evapotranspiration
in Journal of irrigation and drainage engineering; ASCE-American Society of Civil Engineers, Reston (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Pagina inizio

Pagina fine

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

Rivista

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

Note

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

- Department of Land, Air and Water Resources, University of California, Davis, USA - Dipartimento di Economia e Sistemi Arborei, Università di Sassari, Italy - Istituto di Biometeorologia, Consiglio Nazionale delle Ricerche, CNR-IBIMET (ex IMaes), Sassari, Italy - Department of Land, Air and Water Resources, University of California, Davis, USA - California Department of Water Resources, Bluff, CA, USA (literal)

Titolo

Abstract

Experiments to measure the evapotranspiration of an improved, irrigated pasture were conducted at the University of California, Davis, CA field station and over a commercial irrigated pasture on Twitchell Island in the Sacramento-San Joaquin River Delta using the surface renewal (SR) method. In Davis, the SR method was used to determine well-watered crop evapotranspiration (ETc) over short grass, and the results were compared with the ASCE-EWRI standardized reference evapotranspiration (ETo) for a short canopy to establish that a crop coefficient Kc=1.00 is appropriate for estimating well-watered pasture ETc. In the Twitchell Island study, surface renewal was used to determine the actual evapotranspiration (ETa) from a commercial pasture. A stress coefficient of Ks=ETa/ETo approximate to 0.90 was observed during the high ET period (ETo>7 mm day-1) from about mid-June through mid-July for the Twitchell Island pasture. Otherwise, the pasture was mainly unstressed, so the Ks=1.0. Thus, assuming no future changes in irrigation management, using ETo from Twitchell Island, a Kc=1.00, and Ks=1.00 will provide good estimates of ETa during low to moderate ET periods and Ks approximate to 0.90 should be used when ET0>7.0 mm day-1. In general, a thermocouple for SR measurements costs about 0, whereas the price for a sonic anemometer varies between ,000 and ,000, so the SR method provides a low-cost method to measure ETa. (literal)

Editore