Determination chlorine of groundwater with electrical conductivity by Geostatistical methods (Case study of drinking water wells Mashhad)

Document Type: Original Article

Authors

Ferdowsi University of Mashhad.

Abstract

Information on chlorine concentration in groundwater for drinking and agriculture is important. If the
concentration of this element is in too much water can cause problems for humans and is toxic to
plants. Measurement of chloride in groundwater is extensive, costly and time consuming. Find easy
and inexpensive method has a special importance. the Statistical methods are based on spatial
variables. Changes of these variables point to the other have a certain continuity. This study for
evaluation the ability of geostatistical methods for estimating chlorine using auxiliary variables
Electrical Conductivity in groundwater of Mashhad and the surrounding was conducted . For this
purpose, 276 wells were sampled and Parameters were measured electrical conductivity and chlorine.
The data with software GS+ were analyzed. To determine the spatial correlation of data, Variograms
were calculated and plotted.The results showed good continuity exists between the measured
parameters. The correlation between two variables based on the variogram, 0 .91 Was calculated.
Spherical model for Electrical Conductivity and Gaussian model for chlorine based on the minimum
amount of RSS as the most suitable model was fitted to the data. For Comparison of methods
estimation of the root mean square error (RMSE) and plot of observational and estimated values were
used. Geostatistical methods, the chlorine more accurately than IDW and NDW methods were
estimated.

Keywords


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