Analysis of groundwater quality in the northwest of Iran

作者：Talaee Parisa Hosseinzadeh^*

来源：Desalination and Water Treatment, 2015, 56(9): 2323-2334.

DOI：10.1080/19443994.2014.963155

• Groundwater level
• Water quality parameters
• Spatial distribution
• Geostatistics
• Drinking water standard

The aim of the study is to determine the spatial variability of groundwater depth and pollutant concentration levels in Ardabil plain in the northwest of Iran using geographical information systems. Ordinary kriging method was used to analyze the spatial pattern of groundwater depth and quality parameters, while indicator kriging (IK) method was utilized to analyze groundwater quality parameters equal to or greater than the pollution threshold values. The created spatial variability maps showed that in more than half (53%) of the study area, groundwater depth was less than 20m from the ground surface. Quantity of salinity was higher than 2.5dSm(-1) in 2% of the study area and the nitrate concentration exceeded 50mgl(-1) in 8% of the region. The probability maps exhibited that about 3% of the area had the highest probability (0.8-1.0) of exceedance of the threshold nitrate concentration, but the area did not have any highest probability of exceedance of the threshold electrical conductivity value in the groundwater. Additionally, other parameters of groundwater quality, i.e. chloride (Cl), pH, sulfate (SO4), bicarbonate (HCO3), calcium (Ca), sodium (Na), magnesium (Mg), and total hardness (TH) had a good quality and their concentrations were lower than the corresponding threshold values. The prepared spatial variability and probability maps will assist for proper management of groundwater resources for agricultural and drinking purposes and minimizing the pollution hazard in the study area.

• 出版日期2015-11-27