Validation of the Kostiakov model to estimate cumulative infiltration in the arid regions of the southwestern Iran | |
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( Volume 2 Issue 4,April 2016 ) OPEN ACCESS | |
Author(s): | |
Bijan Azad, Atefeh Fatahi, Negar Eyni, Marjan Noorolahi, Danial Dabiri | |
Abstract: | |
Infiltration is a complex physical process in timeand space, which isdifficult to characterize with precision under the intrinsicheterogeneous and dynamic soil conditions. The precise determination of the water infiltration in the soil helps to minimize the risks of degradation, especially with the processes of surface runof and flood. Dashte-Abbas is one of the most talented agricultural areas of the Ilam province and Iran country. measurement and classification of soil infiltration is essential to better manage water resources and the prevention of desertification in the Dashte-Abbas plain. Measurement of soil infiltration is time and cost consuming and but many models have been developed for infiltration estimate, which prevents of a lot of time and high costs consuming. Kostiakov is one of the models that is being used widely to estimate soil infiltration, which as the most widely used model in the planing of soil and water. The main objectives of this study were: to; 1) validate the Kostiakov model estimates with the measured cumulative infiltration and 2) to determine the coefficients of Kostiakov model. For this purpose, soil infiltration measured using the double-ring infiltrometer in 37 stations with 3 repetitions. Using the data obtained, Kostiakov model coefficients were determined. Mean values of a and c coefficients were 0.4275 and 0.7542, respectively. Results showed that the range of variation of coefficient of c was large, which demonstrated considerable spatial variability in the study area. The normalized root mean square error (NRMSE) indicates the total difference between the measured and modeled (estimated) values was NRMSE=0.15, and performance efficiency was EF= 0.74. Thus, it confirms that the Kostiakov model accurately estimates the cumulative infiltration in the Dashte-Abbas plain in southwestern Iran. |
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