Qualitative assessment of Birjand plain aquifer for pressurized irrigation by using Geostatistic Indicator Kriging Method

Document Type : Original Article

Authors

1 PhD Student/ Dept. of water Eng./ Faculty of Agriculture/ University of Birjand/Birjand/Iran

2 Water engineering Dept. Faculty of Agriculture University of Birjand Birjand Iran

3 university of birjand, Avini street, birjand city, soth khorasan province,iran

Abstract

Due to the importance of groundwater resources in arid and semi arid regions, the qualitative assessment of these resources is so important. Pressurized irrigation as a suitable method for increasing irrigation efficiency and reducing water consumption, requires water quality analysis. Despite many activities of researchers in the preparation of groundwater quality maps by using geostatistical methods, most of these studies have focused on the use of conventional kriging techniques that are not suitable for the preparation of vulnerable zones of contamination, In this study spatial variations of aquifer quality parameters and especially suitable areas for pressurized irrigation were investigated by using indicator Kriging method. For this purpose groundwater quality data from 27 wells in Birjand aquifer were studied during 2016. Qualitative parameters were evaluated including pH (acidity), EC (electrical conductivity), SAR (sodium absorption ratio), Na, NaCl, Cl and ClCO and HCO3, respectively. The allowed thresholds for use of these parameters were considered in pressurized irrigation with the proposed FAO limitaion. On the other hand, due to the importance of Langelier Saturation Index in sedimentation of drip irrigation system, this index was also evaluated for aquifer wells and unsuitable areas for pressurized irrigation in the aquifer were determined using the geostatistical indicator kriging method and ArcGIS software.The results indicate suitable irrigation region are located in the eastern and central parts of the plain.

Keywords

References

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Iranian Journal of Irrigation & Drainage
Volume 13, Issue 1 - Serial Number 73
July and August 2019
Pages 34-44

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