Document Type : Research Paper
Authors
Abstract
The management of surface irrigation systems, specifically furrow irrigation, is costly, time-consuming, and complicated because of spatial and temporal variations of infiltration. The infiltration parameters for inflow discharge, furrow geometry, and soil water content vary for furrow irrigation; consequently, it is difficult to present a general equation for infiltration. Scaling is a suitable method of obtaining a general relationship for infiltration. The present study developed an appropriate equation for scaling of infiltration components using dimensional analysis and irrigation test datasets with 15 replicates for 12 distinctive furrows. Calibration of the proposed equation produced R2 and RMSE values of 0.984 and 0.0199, respectively. The results for validation of the equation demonstrated high R2 values (>0.98) and low RMSE values (<0.01), which reflects the accuracy of this model. A comparison of the proposed model and published equations revealed the superiority of the proposed equation. The advantages include the need for less data (inflow discharge, flow depth in furrow, irrigation time, and advance time) and ease of measurement of the required inputs.
Keywords
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