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Evaluación del lixiviado de nitratos mediante el código GLEAMS acoplado a un GIS: aplicación al acuífero de Mnasra (Marruecos)
| Content Provider | Semantic Scholar |
|---|---|
| Author | Tamoh, Karim Maslouhi, Abdellatif Lledó, Lucila Candela Carrera, Juan |
| Copyright Year | 2005 |
| Abstract | In the area of Mnasra, (North-Western Morocco), the water table is very shallow and the exchanges between the surface of the soil and groundwater are particularly intense. The aquifer in this area shows high vulnerability to contaminants and in particular to agrochemicals. During the last years the risk has increased due to changes in agricultural management with intensive fertilizer application in order to increase crop productivity. Consequently, as agricultural pollution occurs nitrate becomes the major anion in groundwater, exceeding the standard of 50 mg/l in the majority of the wells. In order to avoid and predict such nonpoint pollution, it is necessary to analyse the causes of contamination and to characterise N transport through the unsaturated zone. To obtain this information, models for solute transport (i.e. GLEAMS) and a GIS can be used as a tool for organizing, storing retrieving and displaying spatially related information. In the area of Mnasra, characterised by a diversity of soil profiles and cultural practices, forecast transport and spatial distribution of N pollution risk has been carried out by coupling the GLEAMS code to ARCVIEW. The coupled system made also possible the preparation of aquifer vulnerability maps to nitrate pollution. For validation and calibration, a sandy zone cultivated with corn was selected. We found a good agreement between simulated results and measurements of nitrate concentrations in groundwater. The system also allowed to establish different maps for the Mnasra area depicting the spatial distribution of evapotranspiration, nitrogen extracted by plants, and mineralized, denitrified, and leached nitrogen. This step also enabled to determine the types of agricultural practices producing the greatest risk of nitrogen leaching. |
| Starting Page | 45 |
| Ending Page | 49 |
| Page Count | 5 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://abe.ufl.edu/faculty/carpena/files/pdf/zona_no_saturada/estudios_de_la_zona_v7/c045-049.pdf |
| Alternate Webpage(s) | http://www.zonanosaturada.com/zns05/publications_files/area_1/08.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
