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SURROGATE ESTIMATION OF SOIL WATER RETENTION CHARACTERISTICS OF SEASONALLY IMPOUNDED SOILS

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Title SURROGATE ESTIMATION OF SOIL WATER RETENTION CHARACTERISTICS OF SEASONALLY IMPOUNDED SOILS
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Creator N.G. Patil and G.S. Rajput
 
Subject Neural networks, Pedotransfer function, Soil water retention characteristics, VG function, Waterlogged soils
 
Description Not Available
Measurement of soil hydraulic properties is an arduous task, especially to meet the large scale
data requirements. This has prompted numerous studies on surrogate estimation of hydraulic
properties. Objective of this study was to build regional hydraulic database and develop pedotransfer
functions (PTF) for estimation of water retention characteristics (WRC) of seasonally impounded
shrink-swell soils. Soil samples from 41 soil profiles were analyzed in the laboratory for soil-water
retention at nine pre-determined suction pressure points and basic soil properties. These data were
used for calibrating neural PTFs to predict Van Genuchten (VG) function parameters for prediction
of WRC from basic soil properties data. Routine method of deriving and relating retention function
parameters to basic soil properties and Neuro-m method resulted in unacceptable PTFs (RMSE >
0.05 m3 m-3) . In place of parameters derived from SWRC, we used ‘Rosetta’ estimates of VG parameters
to relate basic soil properties. Resultant hierarchical parametric PTFs with prediction accuracy of
RMSE < 0.05m3 m-3 are presented. Successful calibration of PTFs using modified method indicates
that no method is generic.
Not Available
 
Date 2024-07-01T11:06:04Z
2024-07-01T11:06:04Z
2014-03-10
 
Type Research Paper
 
Identifier N.G. Patil and G.S. Rajput
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/83830
 
Language English
 
Relation Not Available;
 
Publisher Not Available