Samira Rahnama; Hossein Khozeymehnezhad; Abbas KhasheiSiuki
Abstract
Background and Aim:Due to the increasing demands of the human population to groundwater, protection and prevention of these water resources from pollution are necessary. The purpose of this study was to evaluate the vulnerability of groundwater aquifer in Kuchesfahan- Astane plain located in Gilan province ...
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Background and Aim:Due to the increasing demands of the human population to groundwater, protection and prevention of these water resources from pollution are necessary. The purpose of this study was to evaluate the vulnerability of groundwater aquifer in Kuchesfahan- Astane plain located in Gilan province using DRASTIC method and nonparametric models. Materials and Methods:In this study, seven layers were prepared for parameters in GIS software, and after weighting and combining standard ranks, the groundwater vulnerability maps for the study area were prepared. Nitrate data were used to validate the model in this region. Subsequently, by using the nonparametric models, Instance-Based Learning with parameter K (IBK) and the Tree Decision M5, the amount of nitrate was estimated. Meanwhile, Gamma test was conducted to find the best combination of input parameters. ResultsThe results revealed that the vulnerability of groundwater aquifer in this plain has 4 classes including 18.56 % in low vulnerability, 51.29 % in low to medium vulnerability, 28.46% in medium to high vulnerability, and 1.67% in high vulnerability classes. Also, the results showed that both of the nonparametric models have suitable estimates of the nitrate content, but the M5 decision tree model yielded the best results (R2=0.98). Conclusion:The results showed that nonparametric models are efficient method to estimate the aquifer vulnerability and provide accurate results to estimate the potential of contamination in the study area.This demonstrates the superiority of the M5 model over other aquatic vulnerability assessment methods.
Samira Rahnama; Ali Shahidi
Abstract
Abstract Background and purpose: Surface water, especially rivers, are one of the most important water resources that play an important role to supply water requirements of different activities. and we able to make decisions about their application with their quality monitoring. This study was done to ...
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Abstract Background and purpose: Surface water, especially rivers, are one of the most important water resources that play an important role to supply water requirements of different activities. and we able to make decisions about their application with their quality monitoring. This study was done to evaluate the southern branches of Haleil Rood River quality using Canadian Water Quality Index (CWQI) and Aquachem software. Materials and Methods: In this cross sectional study, water quality parameters were used in three stations in the southern shaft of the Haleil Rood river (Hossein-Abad, Konarueyeh and Kahang-Sheibani) from 1996 to 2016. To determine the water quality of the river and determine the type and characteristics was used of the water quality index CWQI and Aquachem software Results: The results showed that water qualitative conditions in the two stations of Konarueyeh and Kahang-Sheibani are in high rank in different types of use. Hossein-Abad Station is in good condition for drinking and in terms of aquaculture in the border range and rank high for recreational activities, irrigation and livestock. Also, the analysis of the graphs obtained from Aquachem software showed that the river water of the Hossein-Abad station was in good order and the two another stations are in excellent condition. Conclusion: The cross sectional study of the chemical quality of the Haleil Rood river shows that the water river from the upstream to downstream is in excellent condition for drinking water. For agriculture, it is also within the range of high quality water. Based on the Piper diagram, the chemical quality of the river water is at the three stations studied, Sodium-Chloride. In addition based on the results, it is expected to be provided valuable information in connection with the use of water bodies by the local people of the study region.