Zoning Electrical Conductivity of Groundwater through Using Cokriging Method: A Case Study in Darab Plain, Fars Province

صدق‌آمیز, عباس and سهیلی, اسماعیل Zoning Electrical Conductivity of Groundwater through Using Cokriging Method: A Case Study in Darab Plain, Fars Province. In: 1st International Conference and the 4th National Conference on Conservation of Natural Resources and Environment, August 2019, Ardabil, Iran.

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Abstract

The study is aimed to determine the zonation map for groundwater quality in Darab plain, in Fars province. For this purpose, the electrical conductivity data of the 71 wells in different seasons between October 2017 to September 2018 was used. Data analysis was done in GIS environment in which zoning maps were prepared by Cokriging method. As a secondary aim, it has tried to assess the effect of different secondary variables on the results' accuracy. So three different variables, including electrical conductivity at spring 2018, winter 2018 and fall 2017 have been used in geostatistical modeling as secondary variables. obtained Results from models' validation and test could confirm that the models have the same performance, so all of the secondary variables can be used for Cokriging method. Furturemore the zonation results showed that groundwater electrical conductivity have an increasing trend from north to south, without significant change from northwest to southeast. Also, the error variance maps illustrated that the lower the electrical conductivity, the lower the estimation error, and vice versa.

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