Evaportranspiration studies for protective barriers: FY 1989 status report

Technical Report · Fri May 01 04:00:00 EDT 1992

DOI:https://doi.org/10.2172/5153420· OSTI ID:5153420

Link, S O; Thiede, M E; Downs, J L; Lettau, D J ^[1]; Waugh, W J ^[2]

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1. Pacific Northwest Lab., Richland, WA (United States)
2. Geotech, Grand Junction, CO (United States)

This document describes the results of technological developments and experiments at the Small Tube Lysimeter Facility. The objective of this research is to develop the capability to predict evapotranspiration in support of studies of water infiltration control for the Hanford Protective Barrier Development Program. Evapotranspiration is the combined loss of water from plants and soil surfaces to the atmosphere. This process must be predictable to adequately model soil water dynamics. We develop a miniature greenhouse (gas exchange chamber), where internal temperature and relative humidity can be controlled. With this device we measured evapotranspiration, transpiration, and carbon dioxide exchange rates from lysimeters with various surface and plant characteristics. We tested the effect on gas exchange rates and sand, gravel, admix, and soil surfaces in lysimeters where, cheat-grass, Bromus tectorum, had been seeded. Results showed that evapotranspiration was unaffected by the surface treatments. Estimated transpiration rates were higher for plants growing in sand compared with rates for plants growing in the admix and soil treatments. Soil evaporation rates were higher in the gravel treatment than in the sand treatment. Future research will entail parameterization of relationships between evapotranspiration, transpiration, soil evaporation, carbon dioxide exchange, and the abiotic and biotic factors that drive these processes for model development.

• Research Organization: Pacific Northwest Lab., Richland, WA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5153420
• Report Number(s): PNL-8033; ON: DE92016103
• Country of Publication: United States
• Language: English

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CONTAINMENT
CONTAINMENT SYSTEMS
DATA ANALYSIS
DOCUMENT TYPES
ENGINEERED SAFETY SYSTEMS
EVAPORATION
GROUND DISPOSAL
HANFORD RESERVATION
HAZARDOUS MATERIALS
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US ERDA
US ORGANIZATIONS
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