Assessing groundwater vulnerability based on modified DRASTIC-model and COP-model in arid areas

2021 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
Saeid Eslamian ◽  
Osama Gazal
Keyword(s):  
Groundwater Vulnerability ◽  
Arid Areas ◽  
Drastic Model ◽  
Modified Drastic

Groundwater Vulnerability Mapping in Urbanized Hydrological System Using Modified Drastic Model and Sensitivity Analysis

2018 ◽  
Vol 24 (3) ◽  
pp. 293-304 ◽  
Author(s):  
Ismail Chenini ◽  
Adel Zghibi ◽  
Mohamed Haythem Msaddek ◽  
Mahmoud Dlala
Keyword(s):  
Land Use ◽  
Vadose Zone ◽  
Vulnerability Assessment ◽  
Groundwater Vulnerability ◽  
Vulnerability Index ◽  
Drastic Model ◽  
Groundwater Vulnerability Mapping ◽  
Groundwater Vulnerability Assessment ◽  
Modified Drastic ◽  
The Impact

Abstract The groundwater vulnerability assessment is normally applied to rural watersheds. However, urbanization modifies the hydrogeological processes. A modified DRASTIC model was adopted to establish a groundwater vulnerability map in an urbanized watershed. The modified DRASTIC model incorporated a land-use map, and net recharge was calculated taking into account the specificity of the urban hydrogeological system. The application of the proposed approach to the Mannouba watershed demonstrates that the groundwater vulnerability indexes range from 80 to 165. The study's results shows that 30 percent of the Mannouba watershed area has a high vulnerability index, 45 percent of the area has a medium index, and 25 percent of the study area has a low vulnerability index. To specify the effect of each DRASTIC factor on the calculated vulnerability index, sensitivity analyses were performed. Land use, topography, and soil media have an important theoretical weight greater than the effective weight. The impact of the vadose zone factor has the most important effective weight and affects the vulnerability index. The sensitivity assessment explored the variation in vulnerability after thematic layer removal. In this analysis, the removal of hydraulic conductivity and impact of vadose zone modified the vulnerability index. Groundwater vulnerability assessment in urbanized watersheds is difficult and has to consider the impact of urbanization in the hydrogeological parameters.

scholarly journals Estimating groundwater vulnerability to pollution using a modified DRASTIC model in the Kerman agricultural area, Iran

2013 ◽  
Vol 71 (7) ◽  
pp. 3119-3131 ◽  
Author(s):  
Aminreza Neshat ◽  
Biswajeet Pradhan ◽  
Saied Pirasteh ◽  
Helmi Zulhaidi Mohd Shafri
Keyword(s):  
Groundwater Vulnerability ◽  
Agricultural Area ◽  
Drastic Model ◽  
Modified Drastic

scholarly journals Assessment and Estimating Groundwater Vulnerability to Pollution Using a Modified DRASTIC and GODS Models (Case Study: Malayer Plain of Iran)

2018 ◽  
Vol 4 (2) ◽  
pp. 433 ◽  
Author(s):  
Maryam Hosseini ◽  
Ali Saremi
Keyword(s):  
Nitrate Concentration ◽  
Groundwater Vulnerability ◽  
Drastic Model ◽  
Drastic Index ◽  
Parameters Uncertainty ◽  
Modified Drastic ◽  
Hamedan Province ◽  
Very High ◽  
Better Than

This study deals with the intrinsic vulnerability of groundwater reservoirs to pollution, by the use of two models DRASTIC and GODS, this study is done by taking samples from 17 water resources of Malayer plain Aquifer area of southern Hamedan Province, Iran. 30 physicochemical parameters and heavy metals have been studied and vulnerability of this aquifer to the nitrate concentration, was determined. The study showed that results from DRASTIC were better than GODS in Assessment and Estimating groundwater vulnerability to pollution, also DRASTIC model has been corrected, and compared the ability of these two models in vulnerability zoning has been evaluated. According to high correlation between DRASTIC index and nitrate concentration, ranking and weighting of nitrate pollutant is inserted in the DRASTIC equation, and zoning map of DRASTIC method has been calibrated by nitrate concentration. By this method, vulnerability zoning is determined between very low to very high, which shows the increase of DRASTIC index by nitrate concentration. DRASTIC parameters uncertainty has affected the zoning results in this method, but its calibration with nitrate concentration, gives more accurate vulnerability results.

Sign in / Sign up

Export Citation Format

Share Document