Modeling spatial and temporal variability in irrigation and drainage systems: improvements to the Colorado State irrigation and drainage model (CSUID)
Date
2009-11
Authors
Alzraiee, Ayman, author
Garcia, Luis, author
Burnett, Roger, author
U.S. Committee on Irrigation and Drainage, publisher
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Abstract
The Colorado State University irrigation and drainage model (CSUID) is a three dimensional variable saturated-unsaturated numerical model that simulates the subsurface flow and transport processes. A wide range of enhancements have been done to CSUID to fully simulate the response of agricultural fields to external stresses such as subsurface drainage systems, root extractions and irrigation activities. The model is also capable of simulating salinity transport process through the vadose zone and in the saturated zone. The partition of salinity between the soil solid phase and the water phase is included in the model to simulate the accumulation of salts in the root zone. The strength of CSUID is in its ability to simulate irrigation-drainage activities taking into account spatially and temporal variably in water quality and quantity and under spatial heterogeneous soil properties. Soil properties such as hydraulic conductivity, porosity, Van Genutchen retention curve parameters, storativity, dispersivity, partition coefficients are all modeled as spatially variables. Having a model with these capabilities is an important step toward understanding the uncertainty in the design and management of irrigation-drainage systems. The model contains a Graphical User Interface that allows the user to visualize the input and output.
Description
Presented at the fifth international conference on irrigation and drainage, Irrigation and drainage for food, energy and the environment on November 3-6, 2009 in Salt Lake City, Utah.