TY - CONF
T1 - Field techniques for measuring soil hydraulic properties in unsaturated soils
AU - Takeshita, Yuji
N1 - Funding Information:
This work was supported by the Joint Research Grant made by Ministry of Land, Infrastructure, Transport and Tourism, Chugoku Regional Development Bureau, Okayama River Management Office, Japan and supported by JSPS KAKENHI Grant NumberJP?18K04347.Theauthoralsoisgratefulto Mr. Nobutaka Katayama and Mr. Ryuji Goto (a graduate of Okayama University) for their help in conducting the field tests and the numerical analysis.
Funding Information:
This work was supported by the Joint Research Grant made by Ministry of Land, Infrastructure, Transport and Tourism, Chugoku Regional Development Bureau, Okayama River Management Office, Japan and supported by JSPS KAKENHI Grant Number JP 18K04347. The author also is grateful to Mr. Nobutaka Katayama and Mr. Ryuji Goto (a graduate of Okayama University) for their help in conducting the field tests and the numerical analysis.
Publisher Copyright:
© 2019 7th Asia-Pacific Conference on Unsaturated Soils, AP-UNSAT 2019. All rights reserved.
PY - 2019
Y1 - 2019
N2 - In-situ permeability tests using soil water contents that easily and quickly measure the saturated-unsaturated hydraulic properties in the unsaturated soils are proposed. The continuous constant head infiltration test and gravity drainage test with intrusive soil moisture device to measure the field-saturated hydraulic conductivity and the field-saturated volumetric water content were performed. The unsaturated soil hydraulic properties were estimated by transient soil water contents during these tests. Sensitivity analysis was carried out under the estimation parameters are limited. The change of the water content in the soil during the constant head infiltration test process and the gravity drainage test process were individually simulated by the seepage flow analysis. From these simulations, functional model of the unsaturated soil hydraulic properties considering the hysteresis phenomenon were identified.
AB - In-situ permeability tests using soil water contents that easily and quickly measure the saturated-unsaturated hydraulic properties in the unsaturated soils are proposed. The continuous constant head infiltration test and gravity drainage test with intrusive soil moisture device to measure the field-saturated hydraulic conductivity and the field-saturated volumetric water content were performed. The unsaturated soil hydraulic properties were estimated by transient soil water contents during these tests. Sensitivity analysis was carried out under the estimation parameters are limited. The change of the water content in the soil during the constant head infiltration test process and the gravity drainage test process were individually simulated by the seepage flow analysis. From these simulations, functional model of the unsaturated soil hydraulic properties considering the hysteresis phenomenon were identified.
KW - In-situ permeability test
KW - Inverse analysis
KW - Parameter estimation
KW - Soil hydraulic properties
KW - Soil water content
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U2 - 10.3208/jgssp.v07.001
DO - 10.3208/jgssp.v07.001
M3 - Paper
AN - SCOPUS:85087328791
SP - 1
EP - 7
T2 - 7th Asia-Pacific Conference on Unsaturated Soils, AP-UNSAT 2019
Y2 - 23 August 2019 through 25 August 2019
ER -