| Journal: | Anais da Academia Brasileira de Ciencias |
| Database: | PERIÓDICA |
| System number: | 000400427 |
| ISSN: | 0001-3765 |
| Authors: | Goncalves, Monica A1 Garcia, Fabio C2 Barroso, Gilberto F2 |
| Institutions: | 1Agencia Estadual de Recursos Hidricos, Vitoria, Espirito Santo. Brasil 2Universidade Federal do Espirito Santo, Departamento de Oceanografia e Ecologia, Vitoria, Espirito Santo. Brasil |
| Year: | 2016 |
| Season: | Sep |
| Volumen: | 88 |
| Number: | 3 |
| Pages: | 1341-1356 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, descriptivo |
| English abstract | Lake Nova (15.5 km2) is the second largest lake in the Lower Doce River Valley (Southeastern Brazil). A better understanding of ecosystem structure and functioning requires knowledge about lake morphometry, given that lake basin form influences water column stratification. The present study aims to contribute to the understanding of relationship between morphometry and mixing patterns of deep tropical lakes in Brazil. Water column profiles of temperature and dissolved oxygen were taken on four sampling sites along the lake major axis during 2011, 2012 and 2013. The bathymetric survey was carried out in July 2011, along 131.7 km of hydrographic tracks yield 51,692 depth points. Morphometric features of lake size and form factors describe the relative deep subrectangular elongated basin with maximum length of 15.7 km, shoreline development index 5.0, volume of 0.23 km3, volume development of 1.3, and maximum, mean and relative depths of 33.9 m, 14.7 m and 0.7 %, respectively. The deep basin induces a monomictic pattern, with thermal stratification during the wet/warm season associated with anoxic bottom waters (1/3 of lake volume), and mixing during dry and cool season. Based on in situ measurements of tributary river discharges, theoretical retention time (RT) has been estimated in 13.4 years. The morphometry of Lake Nova promote long water RT and the warm monomictic mixing pattern, which is in accordance to the deep tropical lakes in Brazil |
| Disciplines: | Geociencias |
| Keyword: | Hidrología, Lagos tropicales, Morfometría, Batimetría, Circulación del agua, Patrones de mezcla, Sistemas de Información Geográfica (SIG) |
| Keyword: | Earth sciences, Hydrology, Tropical lakes, Morphometry, Bathymetry, Water circulation, Mixing patterns, Geographic Information Systems (GIS) |
| Full text: | Texto completo (Ver HTML) |
