Measuring and modelling evapotranspiration from Douglas-fir stands
department or school: Land and Food Systems, Faculty of
data provider: DSpace
degree campus: UBCV
creator: Spittlehouse, David Leslie
issued: 2010-03-31T21:47:24Z
issued: 1981
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Methods of measuring forest evapotranspiration are reviewed and evaluated. Measurements on Douglas-fir stands indicated that eddy correlation, Bowen ratio/energy balance, stomatal diffusion resistance and soil water balance methods agreed with each other to within their respective measurement errors. A detailed error analysis of a Bowen ratio/energy balance system indicated that it could give estimates of evapotranspiration to within ± 15% and ± 40% when evapotranspiration was high and low, respectively. The accuracy of this system was due to the use of a high sensitivity monitoring system, and the periodic reversal of well-matched sensors which results in the cancelling of certain systematic errors. The effects of certain non-cancelling errors are also illustrated. Approaches to modelling forest evapotranspiration are reviewed and two approaches chosen for further study. Data obtained using the Bowen ratio/energy balance, stomatal diffusion resistance and soil water balance methods are used in the development and testing of two forest evapotranspiration models. These models are combined with simple interception and drainage relationships to produce two forest water balance models. [the rest of the abstract can be found in the attached PDF file]
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/23182
note: MEASURING AND MODELLING EVAPOTRANSPIRATION FROM DOUGLAS-FIR STANDS by DAVID LESLIE SPITTLEHOUSE ( B . S c , U n i v e r s i t y of Not t ingham, Eng land , 1969) ( M . S c , U n i v e r s i t y of Saskatchewan, 1975) A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE FACULTY OF GRADUATE STUDIES (Department o f S o i l Sc ience) We accept t h i s t h e s i s as conforming to the requ i red s tandard THE UNIVERSITY OF BRITISH COLUMBIA March 1981 c~") David L e s l i e S p i t t l e h o u s e , 1981 In p r e s e n t i n g t h i s t h e s i s i n p a r t i a l f u l f i l m e n t of the requirements f o r an advanced degree a t the U n i v e r s i t y o f B r i t i s h Columbia, I agree t h a t the L i b r a r y s h a l l make i t f r e e l y a v a i l a b l e f o r r e f e r e n c e and study. I f u r t h e r agree t h a t p e r m i s s i o n f o r e x t e n s i v e copying of t h i s t h e s i s f o r s c h o l a r l y purposes may be granted by the head of my department or by h i s or her r e p r e s e n t a t i v e s . I t i s understood t h a t copying or p u b l i c a t i o n of t h i s t h e s i s f o r f i n a n c i a l g a i n s h a l l not be a llowed without my w r i t t e n p e r m i s s i o n . Department of The U n i v e r s i t y of B r i t i s h Columbia 2075 Wesbrook P l a c e Vancouver, Canada V6T 1W5 Date DE-6 (2/79) / i i ABSTRACT Methods of measuring forest evapotranspiration are reviewed and evaluated. Measurements on Douglas-fir stands indicated that eddy correlation, Bowen ratio/energy balance, stomatal diffusion resistance and s o i l water balance methods agreed with each other to within their respective measurement errors. A detailed error analysis of a Bowen ratio/energy balance system indicated that i t could give estimates of evapotranspiration to within ± 15% and ± 40% when evapotranspiration was high and low, respectively. The accuracy of this system was due to the use of a high s e …
has type: Thesis/Dissertation
is shown at: 10.14288/1.0095578
language: eng
degree discipline: Soil Science
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/23182