Thesis
Process-based methods to determine lake evaporation on different time scales
Washington State University
Master of Science (MS), Washington State University
2018
Handle:
https://hdl.handle.net/2376/103489
Abstract
Process-based methods for estimating open-water evaporation are needed by many scientific communities because methods of direct evaporation measurement are generally not widely available. The performance of the Priestley-Taylor (PT), deBruin-Keijman (DBK), Bowen ratio energy budget (BREB), Penman (PM), Brutsaert-Stricker (BS), and deBruin (DB) evaporation models were evaluated using eddy covariance direct measurements of evaporation on monthly, daily, and 30-minute time scales. Eddy covariance and meteorological measurements used in this study were gathered from the Ross Barnett Reservoir in Mississippi, U.S.A., throughout the year of 2008. Performance of the evaporation models was determined using three metrics: ability for the evaporation models to explain variance in measured evaporation, magnitude of evaporation difference, and consistency in bias. It was concluded that the models fell into three performance tiers for the monthly (daily) time scale, with BREB, PT, and DBK (DBK, and PT) being in the top tier, PM and BS model falling in the middle performance tier, and the DB model being in the lowest performance tier; relative performance within each tier is indicated by the order in which the models are listed. The models did not naturally fall into three performance tiers for a 30-minute time scale, but were in the same order of performance as the monthly and daily time scales; PT and DBK performance were considered equal for this time scale. Performance of evaporation models were generally consistent throughout all time scales and could be ranked as follows: BREB, DBK/PT, PM, BS, and DB. 30-minute model performance was determined for both varying wind speed and stability conditions. As wind speed increased in magnitude, model performance decreased. It was also determined that when atmospheric stability was unstable, model performance was better relative to when the atmosphere was stable. All models performed poorest when atmospheric stability was near-neutral and wind speeds were high.
Metrics
Details
- Title
- Process-based methods to determine lake evaporation on different time scales
- Creators
- Raleigh Grysko
- Contributors
- Heping Liu (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525075401842
- Language
- English
- Resource Type
- Thesis