Nutrient concentrations in coastal waters: impact of the Guadiana River
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Autónoma de Baja California
2003
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| _version_ | 1876490510170849280 |
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| author | M. J. Bebianno |
| author_facet | M. J. Bebianno |
| contents | Nutrient concentrations in coastal waters: impact of the Guadiana River M. J. Bebianno A. Cravo M. Madureira F. Rita A. J. Silva Ciencias de la Tierra nutrients Alqueva Dam Guadiana River coastal waters Water samples were collected over an area of 900 km2 adjacent to the outflow of the Guadiana River in January 1999 tocharacterize the concentrations and spatial distribution of nutrients (ammonium, nitrite, nitrate, phosphate and silicate) in thewater column. The purpose of the study was to characterize a winter situation of low discharge in terms of nutrient concentrationsin the coastal area adjacent to the Guadiana outflow, before the reduction of the river flow due to the completion of the AlquevaDam. The results show that the maximum influence of the Guadiana outflow was close to the mouth of the Guadiana River,where the highest nutrient concentrations and the minimum of salinity were registered. At the surface, the nutrient concentrationsdecreased gradually as the distance from the coast increased. The influence of the Guadiana outflow at the surface, despite beingsmall, was evident in the area of about 90 km2 that extends westwards from the mouth of the river. In this area, the increase in Ncompounds was more significant than in P and Si. The vertical influence of the outflow of the Guadiana River, until over theisobath lower than 30 m, was reflected in nutrient concentrations that decreased with the increase in depth. However, when thedepth of the water column was greater than 30 m, the nutrient concentrations increased with the increase in depth. It is expectedthat with the completion of the Alqueva Dam, the outflow of the Guadiana River will be reduced even further. Nutrientconcentrations will also be reduced and the influence of the river in the coastal zone will be even smaller. This could have anegative impact on the nutrient biogeochemical cycles and on the overall productivity of the area. 2003 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48029411 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4 Vol.29 |
| format | Artículo científico |
| id | redalyc_48029411 |
| institution | Redalyc |
| language | en |
| publishDate | 2003 |
| publisher | Universidad Autónoma de Baja California |
| spellingShingle | Nutrient concentrations in coastal waters: impact of the Guadiana River M. J. Bebianno Ciencias de la Tierra nutrients Alqueva Dam Guadiana River coastal waters Nutrient concentrations in coastal waters: impact of the Guadiana River M. J. Bebianno A. Cravo M. Madureira F. Rita A. J. Silva Ciencias de la Tierra nutrients Alqueva Dam Guadiana River coastal waters Water samples were collected over an area of 900 km2 adjacent to the outflow of the Guadiana River in January 1999 tocharacterize the concentrations and spatial distribution of nutrients (ammonium, nitrite, nitrate, phosphate and silicate) in thewater column. The purpose of the study was to characterize a winter situation of low discharge in terms of nutrient concentrationsin the coastal area adjacent to the Guadiana outflow, before the reduction of the river flow due to the completion of the AlquevaDam. The results show that the maximum influence of the Guadiana outflow was close to the mouth of the Guadiana River,where the highest nutrient concentrations and the minimum of salinity were registered. At the surface, the nutrient concentrationsdecreased gradually as the distance from the coast increased. The influence of the Guadiana outflow at the surface, despite beingsmall, was evident in the area of about 90 km2 that extends westwards from the mouth of the river. In this area, the increase in Ncompounds was more significant than in P and Si. The vertical influence of the outflow of the Guadiana River, until over theisobath lower than 30 m, was reflected in nutrient concentrations that decreased with the increase in depth. However, when thedepth of the water column was greater than 30 m, the nutrient concentrations increased with the increase in depth. It is expectedthat with the completion of the Alqueva Dam, the outflow of the Guadiana River will be reduced even further. Nutrientconcentrations will also be reduced and the influence of the river in the coastal zone will be even smaller. This could have anegative impact on the nutrient biogeochemical cycles and on the overall productivity of the area. 2003 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48029411 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4 Vol.29 |
| title | Nutrient concentrations in coastal waters: impact of the Guadiana River |
| topic | Ciencias de la Tierra nutrients Alqueva Dam Guadiana River coastal waters |
| url | https://www.redalyc.org/articulo.oa?id=48029411 |