Degradation and Rehabilitation of Natural Land

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Shokrian F, Sabbaq A, Saberi A. Assessment of Nitrate Pollution of Groundwater Resources in Sari Plain. Degrad Rehabil Nat Land 2021; 1 (2) :45-58
URL: http://drnl.sanru.ac.ir/article-1-154-en.html

One of the factors changing the quality and pollution of groundwater resources in plain areas is the presence of nitrate ions. Sari plain is also prone to vulnerability due to the existence of various agricultural, residential, industrial and proximity to the sea. Groundwater quality assessment is costly; But it is possible to save money by using methods to assess the vulnerability of the aquifer. Vulnerability assessment is a low-cost method in identifying areas prone to pollution that plays a key role in water resources management. Therefore, in the present study, two methods, DRASTIC and SI, have been used due to the existence of land use parameter in the SI model and its comparison with the DRASTIC model and the use of the final map to determine the vulnerability of the Sari plain aquifer. For this purpose, first the amounts of nitrate during the years 1393-1397 were zoned and mapped. Then the parameters of both models such as depth to water table, net nutrition, aquifer constituents, soil type, topography, unsaturated zone constituents, hydraulic guidance and land use, which were prepared as a layer in ArcGIS software and weighted and rated Classification and integration of these layers, the final map of paternal damage to contamination was prepared. Based on the results, the two methods were classified into four groups: very low, low, medium and high risk. Medium vulnerability class in DRASTIC and SI methods with 39.75 and 39.56, respectively, have the highest percentage of area in the northern and plain areas with agricultural use. According to the obtained results, the two models showed the same results in terms of vulnerability in the region, but the percentage of area with very low risk in the SI method is higher than DRASTIC.