Type of Document Master's Thesis Author Budisantoso, Soeprapto URN etd-08012012-040534 Title Moisture distribution in soil irrigated with a line source subsurface trickle irrigation system Degree Master of Science Department Agricultural Engineering Advisory Committee
Advisor Name Title Ross, Burton Blake Committee Chair Mostaghimi, Saied Committee Member Perumpral, John V. Committee Member Powell, Norris L. Committee Member Wright, F. Scott Committee Member Keywords
Date of Defense 1989-04-15 Availability restricted AbstractSoil moisture distribution resulting from a line source subsurface trickle irrigation system
was studied on bare and cropped layered soils. The soil type was an Uchee loamy sand.
The Continuous System Modeling Program (CSMP) Model was used to simulate the soil
moisture distribution resulting from the linesource. The model was modified and developed in
FORTRAN programming language. The modification included the effects of layered soil, source
position, number of sources, soil evaporation and plant transpiration. The model was also used to
simulate daily and one-in-several-days irrigations.
Field and laboratory experiments were conducted to determine the soil moisture retention
curve, the hydraulic conductivity, and soil moisture distribution from the line source. This data was
used for model verification with the lateral lines buried 13 inches below the soil surface and spaced
36 and 72 inches apart. Simulated and measured soil moisture distributions were in good agreement.
Simulated moisture distribution indicated that the wetting front expansion is more a function
of irrigation volume than irrigation rate. However, the irrigation rate does affect the soil moisture
distribution. A higher rate will result in a larger quantity of horizontal water movement. The simulation also indicated that a one-in-ten days irrigation causes more horizontal movement than a
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