Document Type

Thesis - Open Access

Award Date

1987

Degree Name

Master of Science (MS)

Department

Agricultural Engineering

Abstract

Numerical regression analysis of hydraulic conductivities and soil water characteristics was used to fit the water management model DRAINMOD to electrical pressure transducer measurements and model estimates of water table depth for a slowly permeable soil. Regression analysis of soil properties can replace the need for extensive field and laboratory analysis of soil properties used in the model. The method allows the water management model to be applied to drainage and sub irrigation system cost/benefit projections more quickly than when using conventional analytical approaches to input parameter determination. The objectives of the research were to evaluate the use of a model fitting technique and DRAINMOD to characterize a slowly permeable soil. accomplish this were: Specific steps to 1. Design and construct a lysimeter similar to a section of a drained/subirrigated field with transiometer instrumentation in place. 2. Measure and analytically estimate DRAINMOD soil property parameters by conventional procedures. 3. Use water table measurements and DRAINMOD to estimate soil property parameters by model fitting techniques. 4. Compare soil parameter estimates derived from DRAINMOD and conventional procedures.

Library of Congress Subject Headings

Drainage

Irrigation

Soil permeability

DRAINMOD

Format

application/pdf

Number of Pages

165

Publisher

South Dakota State University

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