ASCE will be sunsetting the Civil Engineering Database (CEDB) in the coming months. We encourage you to start using the ASCE Library to perform content searches. In the ASCE Library, you can save your search results as well as receive email content alerts when new content relevant to your area of interest is published. Try it out today at https://ascelibrary.org.

 

Hourly Reference Evapotranspiration by Bowen Ratio and Penman Methods

by Samuel O. Ortega-Farias,
R. H. Cuenca,
M. English,



Document Type: Proceeding Paper

Part of: Management of Irrigation and Drainage Systems: Integrated Perspectives

Abstract:

Hourly and daily reference evapotranspiration (ETo) computed from Bowen ratio energy balance (BREB) measurements were compared with ETo estimated from the hourly Penman equation (ETP). A very good agreement between the two methods was observed on an hourly and daily basis. On an hourly basis, the coefficient of determination and slope of the regression line analysis through the origin were 0.93 and 1.05, respectively. On a daily basis, the coefficient of determination was 0.92 and the slope of the regression line was 0.98. These result suggest that the Penman equation could be used with hourly weather data in the Willamette Valley to predict daily ETo for irrigation purposes.

Subject Headings: Regression analysis | Evapotranspiration | Irrigation | Slopes | Meteorology | Data analysis | Weather forecasting

Services: Buy this book/Buy this article

 

Return to search