Academic Journal
Intra-tidal variation of stratification in a semi-arid estuary under the impact of flow regulation
| العنوان: | Intra-tidal variation of stratification in a semi-arid estuary under the impact of flow regulation |
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| المؤلفون: | Felipe Facó Frota, Bárbara Pereira Paiva, Carlos Augusto França Schettini |
| المصدر: | Brazilian Journal of Oceanography, Vol 61, Iss 1, Pp 23-33 (2013) |
| بيانات النشر: | Universidade de São Paulo |
| سنة النشر: | 2013 |
| المجموعة: | Directory of Open Access Journals: DOAJ Articles |
| مصطلحات موضوعية: | Hidrodinâmica estuarina, Açude, Barramento, Gerenciamento de recursos hídricos, Rio Jaguaribe, Ceará, Estuarine hydrodynamics, Weir, damming, Water management, Jaguaribe River, Oceanography, GC1-1581 |
| الوصف: | The Jaguaribe River is the largest semi-arid Brazilian river and represents an important water source for the state of Ceará. The Castanhão Weir, built to regulate the flow of the Jaguaribe, began operating successfully in the 1990s. As a result, the hydrodynamic regime of the estuary has undergone alteration and is no longer subject to the former annual climatological variability of the dry and rainy seasons. This paper introduces an assessment of the changes in the hydrological conditions resulting from the construction of the weir and investigates the structure of the density stratification in the estuary. A field experiment was conducted at the end of the dry season in November 2009, during which salinity and temperature were monitored at different levels for three tidal cycles. The temporal variations in salinity and temperature during the tidal cycles were 16 psu and 1.5°C, respectively. The salinity exhibited a vertical variation of four units, while the temperature variation was much lower. Several stratification indicators were calculated from the observed density: the stratification coefficient, the Brunt-Väisälä frequency and the potential energy anomaly. The results showed that the parameters behave similarly, differences being observed only in their relative magnitudes. The vertical structure of the estuary exhibited marked stratification during the ebb tide but vertical homogeneity during both flood and high tide. With the regularized flow existing under present conditions, the estuary exhibits hyposaline and a partially mixed structure for the period studied, despite the typical expectation of a hypersaline and well-mixed vertical structure. O rio Jaguaribe é o maior rio do semi-árido brasileiro, constituindo uma importante fonte de água para o estado do Ceará. Na década de 1990 entrou em operação o Açude do Castanhão com o objetivo de regularizar a vazão do rio Jaguaribe, o qual obteve grande sucesso. Como consequência foi alterado o regime hidrodinâmico do estuário, o qual atualmente não está ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 1679-8759 1982-436X |
| Relation: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592013000100003; https://doaj.org/toc/1679-8759; https://doaj.org/toc/1982-436X; https://doaj.org/article/ebdbed6a411c44afabbe6f4df651e26c |
| الاتاحة: | https://doaj.org/article/ebdbed6a411c44afabbe6f4df651e26c |
| رقم الانضمام: | edsbas.15DDDA3D |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 16798759 1982436X |
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