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Hydraulic Load‐Cell Lysimeter, Construction, Calibration, and Tests
Author(s) -
Black T. A.,
Thurtell G. W.,
Tanner C. B.
Publication year - 1968
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1968.03615995003200050016x
Subject(s) - lysimeter , calibration , environmental science , evaporation , load cell , suction , transducer , hydrology (agriculture) , soil science , materials science , geotechnical engineering , soil water , geology , meteorology , acoustics , statistics , mathematics , physics , structural engineering , engineering
The construction and calibration of two 35‐metric ton, hydraulic load‐cell lysimeters with suction drainage systems are described. The butyl‐nylon load cells contain an ethylene glycol‐water mixture and pressures are measured with a capacitive pressure transducer. Lysimeter sensitivity is 0.02 mm evaporation. Daily evaporation from the lysimeter and the two independent micrometeorological methods agreed to within 5%. On a June day, lysimeter measurements of evaporation from bare soil lagged measurements using the two other methods by almost 1.5 hours. Differences between the lysimeter thermal regime and that in the surrounding soil accounted for the lag. By using foam plastic insulation of the tank walls, thermal regime differences were minimized.