Document Type : Original Article
Authors
1
Department of Water Science and Engineering and research institute of Water Resources Management in arid region, Faculty of agriculture, Fasa university, Fasa, Iran.
2
Department of Engineering, IS-FOOD Institute (Institute for Innovation & Sustainable Development in Food Chain), Public university of Navarre, Campus de Arrosadía, 31006 Pamplona, Navarra, Spain.
3
Department of Water Engineering, Faculty of agriculture, Kurdistan university, Sanandaj, Iran.
Abstract
Objective: This study introduces a novel approach to determine the optimal midpoint location in the two-point method for estimating infiltration parameters of the Kostiakov-Lewis equation. Unlike the traditional fixed midpoint, which sometimes leads to errors, the proposed method dynamically adjusts the midpoint based on the average advance distance during the advance phase.
Method: To evaluate the performance of the proposed method, data from two border-irrigated fields in the Zarineh Rud irrigation and drainage network were used.
Results: The results of this study showed that the value of the root sum square error index for the advance equation of the proposed method was 17.3 minutes, while for the fixed midpoint method, it was 19.7 minutes. Also, the absolute relative error of the infiltration equations obtained from the two methods in calculating the average depth of infiltrated water in the field was 1.3% and 3.4%, respectively.
Conclusions: Selecting the midpoint in the two-point method based on the average location of the advance distance, in addition to overcoming the challenges of the fixed midpoint, has higher accuracy in estimating the advance time and also in estimating the infiltration parameters, providing a more reliable basis for irrigation management decisions
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