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Title: Evaportranspiration studies for protective barriers: FY 1989 status report

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 drivemore » these processes for model development.« less
Authors:
; ; ;  [1] ;  [2]
  1. (Pacific Northwest Lab., Richland, WA (United States))
  2. (Geotech, Grand Junction, CO (United States))
Publication Date:
OSTI Identifier:
5153420
Report Number(s):
PNL-8033
ON: DE92016103
DOE Contract Number:
AC06-76RL01830
Resource Type:
Technical Report
Research Org:
Pacific Northwest Lab., Richland, WA (United States)
Sponsoring Org:
DOE; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 42 ENGINEERING; 54 ENVIRONMENTAL SCIENCES; GROUND DISPOSAL; CONTAINMENT SYSTEMS; HAZARDOUS MATERIALS; PLANTS; TRANSPIRATION; RADIOACTIVE WASTES; DATA ANALYSIS; EVAPORATION; HANFORD RESERVATION; LYSIMETERS; PROGRESS REPORT; SOILS; TECHNOLOGY ASSESSMENT; CONTAINMENT; DOCUMENT TYPES; ENGINEERED SAFETY SYSTEMS; MANAGEMENT; MATERIALS; MEASURING INSTRUMENTS; NATIONAL ORGANIZATIONS; PHASE TRANSFORMATIONS; RADIOACTIVE MATERIALS; US DOE; US ERDA; US ORGANIZATIONS; WASTE DISPOSAL; WASTE MANAGEMENT; WASTES 052002* -- Nuclear Fuels-- Waste Disposal & Storage; 420205 -- Engineering-- Transport & Storage Facilities-- (1980-); 540210 -- Environment, Terrestrial-- Basic Studies-- (1990-)