Prediction of surface irrigation advance using soil intake properties |
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| Authors: | Dani Or Henoque R Silva |
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| Institution: | (1) Department of Plants, Soils and Biometeorology Utah State University, 84322-4820 Logan, UT, USA;(2) Department of Biological and Irrigation Engineering, Utah State University, 84322-4820 Logan, UT, USA |
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| Abstract: | A simple method for predicting surface irrigation advance trajectories using infiltration parameters and inflow rate as inputs
was developed. The difference between the inflow rate and the sum of infiltration rates over the wetted portion of the field
equals the flow rate available for advance. An average (characteristic) infiltration rate ahead of the wet portion is computed
using a fixed time step. An advance step (for a fixed time step) is calculated from the ratio of the flow rate available for
advance and characteristic infiltration rate. Predictions of advance by the proposed method were compared with field observations,
with the kinematic wave model, and with analytical solutions of Philip and Farrell (1964). In all cases, the method provided
predictions that were in good agreement with field observations, and performed similarly to the kinematic wave model. The
method offers a simple and efficient tool for prediction and evaluation of surface irrigation systems under various soil types
and variable inflow rates. The method is particularly useful for predictions in fields with spatially and temporally variable
intake properties. |
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| Keywords: | Surface irrigation Surge flow Intake properties Heterogeneous soils |
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