Modeling Microtopography in Basin Irrigation

Microtopography has long been regarded as a key variable affecting basin irrigation performance. This paper reports on the extension of a flat bed two-dimensional basin irrigation model to the simulation of irrigation events in basins with microtopography. The model incorporates the local surface sl...

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Bibliographic Details
Published in:Journal of irrigation and drainage engineering 1996-11, Vol.122 (6), p.339-347
Main Authors: Playán, E, Faci, J. M, Serreta, A
Format: Article
Language:English
Subjects:
Agricultural and forest climatology and meteorology. Irrigation. Drainage
Agronomy. Soil science and plant productions
BASIN IRRIGATION
Biological and medical sciences
EXPERIMENTACION EN CAMPO
EXPERIMENTATION AU CHAMP
FIELD EXPERIMENTATION
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Hydrodynamics
IRRIGATION PAR CUVETTE
irrigation performance
Irrigation. Drainage
MATHEMATICAL MODELS
MODELE MATHEMATIQUE
MODELOS MATEMATICOS
Numerical analysis
Q1
RIEGO POR SUMERSION
SIMULACION
SIMULATION
TECHNICAL PAPERS
TOPOGRAFIA
TOPOGRAPHIE
TOPOGRAPHY
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Summary:Microtopography has long been regarded as a key variable affecting basin irrigation performance. This paper reports on the extension of a flat bed two-dimensional basin irrigation model to the simulation of irrigation events in basins with microtopography. The model incorporates the local surface slopes in the x and y directions to the governing set of partial differential equations. Three field experiments were used to validate the extended model. Elevation was measured over irregular grids, and geostatistical techniques were applied to estimate the nodal elevation of the computational grids. Results indicate that inclusion of microtopography improves the estimation of the advance and recession processes and produces lower, more realistic estimates of irrigation performance. To further explore this phenomenon, two numerical experiments were devised consisting of a series of simulations on a level basin with gradually growing microtopography. The times of advance and recession and the irrigation performance indexes are significantly affected by field microtopography, even if laser leveling is used.
ISSN:0733-9437
1943-4774
DOI:10.1061/(ASCE)0733-9437(1996)122:6(339)