scholarly journals Parameter Estimation Methods for the Determination of Unsaturated Soil Hydraulic Properties from Pumping Test Data in Unconfind Aquifers

1990 ◽  
Vol 30 (2) ◽  
pp. 199-210
Author(s):  
Yuji Takeshita ◽  
Makoto Nishigaki ◽  
Iichiro Kono
Keyword(s):  
Parameter Estimation ◽  
Test Data ◽  
Unsaturated Soil ◽  
Hydraulic Properties ◽  
Pumping Test ◽  
Estimation Methods ◽  
Soil Hydraulic Properties ◽  
Soil Hydraulic ◽  
Parameter Estimation Methods

scholarly journals Determination of soil hydraulic properties of unsaturated sandy soil using in situ permeability tests

2002 ◽  
Vol 44 (1) ◽  
pp. 21-33
Author(s):  
Yuji TAKESHITA ◽  
Kazuo YAGI ◽  
Toshihiro MORII ◽  
Mitsuhiro INOUE
Keyword(s):  
Sandy Soil ◽  
Hydraulic Properties ◽  
Soil Hydraulic Properties ◽  
In Situ Permeability ◽  
Soil Hydraulic

scholarly journals Use of field and laboratory methods for estimating unsaturated hydraulic properties under different land uses

2015 ◽  
Vol 19 (3) ◽  
pp. 1193-1207 ◽  
Author(s):  
S. Siltecho ◽  
C. Hammecker ◽  
V. Sriboonlue ◽  
C. Clermont-Dauphin ◽  
V. Trelo-ges ◽  
...  
Keyword(s):  
Land Use ◽  
Unsaturated Soil ◽  
Hydraulic Properties ◽  
Rubber Tree ◽  
Measurement Methods ◽  
Soil Parameters ◽  
Forest Site ◽  
Land Uses ◽  
Soil Hydraulic Properties ◽  
Soil Hydraulic

Abstract. Adequate water management is required to improve the efficiency and sustainability of agricultural systems when water is scarce or over-abundant, especially in the case of land use changes. In order to quantify, to predict and eventually to control water and solute transport into soil, soil hydraulic properties need to be determined precisely. As their determination is often tedious, expensive and time-consuming, many alternative field and laboratory techniques are now available. The aim of this study was to determine unsaturated soil hydraulic properties under different land uses and to compare the results obtained with different measurement methods (Beerkan, disc infiltrometer, evaporation, pedotransfer function). The study has been realized on a tropical sandy soil in a mini-watershed in northeastern Thailand. The experimental plots were positioned in a rubber tree plantation in different positions along a slope, in ruzi grass pasture and in an original forest site. Non-parametric statistics demonstrated that van Genuchten unsaturated soil parameters (Ks, α and n) were significantly different according to the measurement methods employed, whereas the land use was not a significant discriminating factor when all methods were considered together. However, within each method, parameters n and α were statistically different according to the sites. These parameters were used with Hydrus1D for a 1-year simulation and computed pressure head did not show noticeable differences for the various sets of parameters, highlighting the fact that for modeling, any of these measurement methods could be employed. The choice of the measurement method would therefore be motivated by the simplicity, robustness and its low cost.

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