Spatial variations of ground water quality in Birjand Plain for agriculture

Osati, Khaled; Nahvinia, Mohammad Javad

Document Type : Research Paper

Authors

¹ Assistant Professor, Department of Watershed Management, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran

² PhD of Irrigation and Drainage Engineering, Faculty of Agriculture, University of Tehran, Tehran, Iran

Abstract

More than 85 percent of current ground water resources extractions are supplying agriculture water demands in Birjand Plain. Because of the importance of water quality for irrigation, 47 samples collected from piezometric wells in Birjand Plain, to determine ground water quality suitability for agriculture. pH and EC values measured at filed campaign beside laboratory analysis of water samples for major ions concentrations. After chemical analysis of water samples, different geo-statistical models had used to model Cl, HCO₃, SAR, pH and EC water qualities parameters. Then the error of each simulation was calculated. Finally, the best method was performed to prepare spatiality maps of Cl, HCO₃, SAR, pH and EC parameters in Birjand aquifer based on FAO classification. The interpolation errors assessment highlighted Kriging as the most accurate method for all investigated parameters, in compare to Inverse Distance weighting (IDW) and Radial Basis Functions (RBF). The spatiality maps based on FAO classification show that ground water resources in Birjand plain are not applicable for agriculture due to extremely high values of SAR, Cl, and HCO₃, where its usage has limited a little for agriculture by EC and its quality has a suitable range of pH.

Keywords

Main Subjects

GeoHydrology

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Environment and Water Engineering

Spatial variations of ground water quality in Birjand Plain for agriculture

References

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Volume 2, Issue 1 - Serial Number 2
April 2016
Pages 25-36

Spatial variations of ground water quality in Birjand Plain for agriculture

References

References

Volume 2, Issue 1 - Serial Number 2April 2016Pages 25-36

Volume 2, Issue 1 - Serial Number 2
April 2016
Pages 25-36