Redirigiendo al acceso original de articulo en 24 segundos...
Inicio  /  Water  /  Vol: 9 Par: 2 (2017)  /  Artículo
ARTÍCULO
TITULO

Nitrates in Groundwater Discharges from the Azores Archipelago: Occurrence and Fluxes to Coastal Waters

J. Virgílio Cruz    
César Andrade    
Dina Pacheco    
Sandra Mendes and Raquel Cymbron    

Resumen

Groundwater discharge is an important vector of chemical fluxes to the ocean environment, and as the concentration of nutrients is often higher in discharging groundwater, the deterioration of water quality in the receiving environment can be the result. The main objective of the present paper is to estimate the total NO3 flux to coastal water bodies due to groundwater discharge in the volcanic Azores archipelago (Portugal). Therefore, 78 springs discharging from perched-water bodies have been monitored since 2003, corresponding to cold (mean = 14.9 °C) and low mineralized (47.2?583 µS/cm) groundwater from the sodium-bicarbonate to sodium-chloride water types. A set of 36 wells was also monitored, presenting groundwater with a higher mineralization. The nitrate content in springs range between 0.02 and 37.4 mg/L, and the most enriched samples are associated to the impact of agricultural activities. The total groundwater NO3 flux to the ocean is estimated in the range of 5.23 × 103 to 190.6 × 103 mol/km2/a (? = ~523 × 103 mol/km2/a), exceeding the total flux associated to surface runoff (? = ~281 × 103 mol/km2/a). In the majority of the islands, the estimated fluxes are higher than runoff fluxes, with the exception of Pico (47.2%), Corvo (46%) and Faial (7.2%). The total N-NO3 flux estimated in the Azores (~118.9 × 103 mol/km2/a) is in the lower range of estimates made in other volcanic islands.

 Artículos similares

       
 
Elsa Dindi and Ardian Shehu    
Vjosa is the main river of South Albania. Currently, the confined Quaternary gravelly aquifer in its lower course supplies drinking water for roughly 300,000 local residents. In the past years, extracted groundwater quantity has increased, whereas the gr... ver más
Revista: Hydrology

 
Zhiqiang Zhang, Haixue Li, Fawang Zhang, Jiazhong Qian, Shuangbao Han and Fenggang Dai    
The Fengfeng mining area is in the transition zone between the North China Plain and the Taihang Mountains, and groundwater is the main source of water supply in the district. Under the combined influence of human activities and natural geological condit... ver más
Revista: Water

 
Maria Margarita Ntona, Konstantinos Chalikakis, Gianluigi Busico, Micòl Mastrocicco, Kyriaki Kalaitzidou and Nerantzis Kazakis    
Groundwater monitoring is critically important, even though it is costly and often neglected. In this study, a judgmental monitoring of groundwater offering solutions based on a cost and time-effective research approach is presented. The method was perfo... ver más
Revista: Water

 
Thomas Dippong, Cristina Mihali and Alexandra Avram    
This study closely analyzes the water quality dynamics of Teceu Lake, situated in a Natura 2000 protected area in Romania. The research investigates seasonal variations and interconnections with groundwater, assessing various ecological impacts. The main... ver más
Revista: Water

 
Vasiliki Kinigopoulou, Evangelos Hatzigiannakis, Athanasios Guitonas, Efstathios K. Oikonomou, Stefanos Stefanou and Dionisios Gasparatos    
This study, based on circular economy principles and sustainable development practices, aims to present the results of soil samples analysis after their mixture with a biobed bio-mixture of straw, soil and compost, used for two consecutive years as organ... ver más
Revista: Applied Sciences