Mapping parameters of Kostiakov-Lewis infiltration equation in Sistan Dam research field

Keshtehgar, H. (2015) Mapping parameters of Kostiakov-Lewis infiltration equation in Sistan Dam research field. Masters thesis, University of zabol.

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The management of irrigated agricultural fields requires reliable information about soil hydraulic properties and their spatial variability. Geostatistical methods are useful for describing and understanding the spatial distribution of measured variables. In this study the kriging method was used to analyze spatial variability of three parameters of Kostiakov- Lewis infiltration equation (, k and 0 f) in Sistan Dam research field. For this purpose, 113 double rings experiments were made at each node of a 70m×100m grid over the study area and Kostiakov-Lewis infiltration parameters were obtained. Three semivariogram model including spherical, exponential and Gaussian were fitted to the experimental semivariograms of the measured paramaters. Model selection for semivariogram was done with considering maximum of the coefficient of determination (r2) and minimum residual sums of squares (RSS). Results showed that the Gaussian semivariogram model was the best-fitted model for and k parameters with r2= 0.567 and 0.781, respectively. Also results showed that 0 f does not show considerable spatial correlation over the study area. Given the best fitted semivariogram models parameters, spatial variability maps of , k and 0 f were created using kriging method. We found that generally has the largest amount in southern and northern parts of the study area. Also k has the largest amount in eastern and central parts and lowest amount in southern and north-western of the study area. The prepared spatial variability maps could be very useful to farmers so that each area within a field is managed appropriately.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Infiltration rate, Kostiakov-Lewis equation, Spatial variability, Interpolation, Semivariogram, Kriging.
Subjects: S Agriculture > S Agriculture (General)
T Technology > TC Hydraulic engineering. Ocean engineering
Depositing User: Mrs najmeh khajeh
Date Deposited: 21 Jan 2018 07:55
Last Modified: 02 Mar 2019 08:21

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