Evaluation of groundwater nitrate in Ahvaz city with geostatistical and deterministic interpolation methods

Subject Areas : watere sciences

Mostafa Shojaie ¹ (Department of Water Sciences, Shushtar Branch, Islamic Azad University, Shushtar, Iran)
hossein eslami ² (Department of Water Sciences, Shushtar Branch, Islamic Azad University, Shushtar, Iran)

Received: 2019-03-07 Accepted : 2020-03-20 Published : 2019-12-21

Keywords: Groundwater, Nitrate, Ahwaz, Statistics, intermediation,

Abstract :

Groundwater quality is affected by several factors. The most important pollutants of groundwater is nitrate. Investigating the shape of spatial variations of nitrate using different methods of interpolation and mapping these changes can lead the knowledge and insights of experts to future planning. In this research, using nitrate data of 30 sampling wells, nitrate changes in ground water in Ahvaz city have been investigated. The results showed that general methods of deterministic interpolation were better than geostatistical methods and generally the local estimator method had the least error. Zoned maps show that upstream nitrate pollution is lower than 10 ppm, but from the center to downstream , so that the nitrate concentration reached 178 ppm in the outlet. Key words: nitrate, groundwater, intermediation, statistics, Ahwaz