Aquifer vulnerability and seawater intrusion risk using GALDIT, GQISWI and GIS: case of a coastal aquifer in Tunisia
| Autor: | Imen Hentati, Ibtissem Triki, Moncef Zairi, Nadia Trabelsi |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Vulnerability index
0208 environmental biotechnology Population Soil Science Aquifer 02 engineering and technology 010501 environmental sciences 01 natural sciences Vulnerability assessment Groundwater pollution Environmental Chemistry Saltwater intrusion education 0105 earth and related environmental sciences Earth-Surface Processes Water Science and Technology Hydrology Global and Planetary Change geography education.field_of_study geography.geographical_feature_category Geology Pollution 020801 environmental engineering Seawater Groundwater |
| Zdroj: | Environmental Earth Sciences. 75 |
| ISSN: | 1866-6299 1866-6280 |
| Popis: | Due to increase in population and agricultural activities, the Sfax coastal aquifer is under tremendous stress and seawater intrusion becomes a serious concern. This situation needs an assessment of aquifer vulnerability and seawater intrusion risk. A new approach for vulnerability mapping using GALDIT, groundwater quality index for seawater intrusion (GQISWI), geostatistics, the Ghyben–Herzberg model and GIS was developed. The model is used to determine the trend of groundwater contamination by seawater intrusion in the coastal aquifer in Sfax basin (Tunisia). Vulnerability assessment method is recognized through assessing weight and ratings of the GALDIT relevant parameter. A second vulnerability map was realized based upon the groundwater quality index for seawater intrusion integrating the water quality parameters for delineating seawater intrusion in the aquifer. The validation of GQISWI and GALDIT vulnerability maps was undertaken through comparison of areas of high Jones Ratio, chloride and TDS concentration and their relative vulnerability index. The Ghyben–Herzberg model has been used to predict the actual seawater intrusion extend and evaluate the freshwater–saltwater dynamics. The results reveal that the coastal area is currently undergoing seawater intrusion and its northern part is the most affected one by this contamination. |
| Databáze: | OpenAIRE |
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