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Title: Tensiometer and method of determining soil moisture potential in below-grade earthen soil

Abstract

A portable tensiometer to in-situ determine below-grade soil moisture potential of earthen soil includes, (a) a body having opposing first and second ends and being adapted for complete insertion into earthen soil below grade; (b) a porous material provided at the first body end, the porous material at least in part defining a fluid chamber within the body at the first body end, the fluid chamber being fluidically sealed within the body but for the porous material; (c) a degassed liquid received within the fluid chamber; (d) a pressure transducer mounted in fluid communication with the fluid chamber; (e) the body, pressure transducer and degassed liquid having a combined mass; (f) a flexible suspension line connected to the body adjacent the second body end, the flexible line being of sufficient strength to gravitationally freely self suspend the combined mass; and (g) the combined mass being sufficient to effectively impart hydraulic communication between below-grade earthen soil contacted by the porous material under the weight of the combined mass. Tensiometers configured to engage the sidewalls of an earthen opening are also disclosed. Methods of taking tensiometric measurements are also disclosed. 12 figs.

Inventors:
;
Publication Date:
Research Org.:
EG & G Idaho Inc; Lockheed Idaho Technologies Company
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
512408
Patent Number(s):
US 5,644,947/A/
Application Number:
PAN: 8-376,165
Assignee:
Lockheed Idaho Technologies Co., Idaho Falls, ID (United States) IDO; SCA: 540220; PA: EDB-97:113370; SN: 97001827915
DOE Contract Number:  
AC07-94ID13223; AC07-76ID01570
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 8 Jul 1997
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; MEASURING INSTRUMENTS; SOILS; DESIGN; MOISTURE; OPERATION

Citation Formats

Hubbell, J.M., and Sisson, J.B. Tensiometer and method of determining soil moisture potential in below-grade earthen soil. United States: N. p., 1997. Web.
Hubbell, J.M., & Sisson, J.B. Tensiometer and method of determining soil moisture potential in below-grade earthen soil. United States.
Hubbell, J.M., and Sisson, J.B. Tue . "Tensiometer and method of determining soil moisture potential in below-grade earthen soil". United States.
@article{osti_512408,
title = {Tensiometer and method of determining soil moisture potential in below-grade earthen soil},
author = {Hubbell, J.M. and Sisson, J.B.},
abstractNote = {A portable tensiometer to in-situ determine below-grade soil moisture potential of earthen soil includes, (a) a body having opposing first and second ends and being adapted for complete insertion into earthen soil below grade; (b) a porous material provided at the first body end, the porous material at least in part defining a fluid chamber within the body at the first body end, the fluid chamber being fluidically sealed within the body but for the porous material; (c) a degassed liquid received within the fluid chamber; (d) a pressure transducer mounted in fluid communication with the fluid chamber; (e) the body, pressure transducer and degassed liquid having a combined mass; (f) a flexible suspension line connected to the body adjacent the second body end, the flexible line being of sufficient strength to gravitationally freely self suspend the combined mass; and (g) the combined mass being sufficient to effectively impart hydraulic communication between below-grade earthen soil contacted by the porous material under the weight of the combined mass. Tensiometers configured to engage the sidewalls of an earthen opening are also disclosed. Methods of taking tensiometric measurements are also disclosed. 12 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {7}
}