Circulation and transport processes in a tidally forced salt-wedge estuary: The São Francisco river estuary, Northeast Brazil
| Autor: | Bárbara Pereira Paiva, Carlos Augusto França Schettini |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
geography Richardson number geography.geographical_feature_category 010504 meteorology & atmospheric sciences Ecology 010604 marine biology & hydrobiology Flow (psychology) Northeast brazil Estuary Aquatic Science 01 natural sciences Wedge (geometry) Oceanography Circulation (fluid dynamics) Streamflow Spring (hydrology) Animal Science and Zoology Ecology Evolution Behavior and Systematics Geology 0105 earth and related environmental sciences |
| Zdroj: | Regional Studies in Marine Science. 41:101602 |
| ISSN: | 2352-4855 |
| DOI: | 10.1016/j.rsma.2020.101602 |
| Popis: | The Sao Francisco river flow is regulated by a series of dams that work in cascade for hydro-power generation, maintaining the flow ∼ 11 km at high tide. The salt intrusion is laterally asymmetric, influenced by the system morphology. There is a strong tidal attenuation along the estuary, even though the flow regime is sub-critical (Richardson Number > 0.25). The estuary presented lateral variability of currents modulated by the tide, being horizontally sheared during spring tide and vertically sheared during neap. The transport of scalars was modulated by the tide, and the estuary exported SPM, dissolved oxygen, and chlorophyll both during neap (44.4, 12.9 and 3.6x10−3 kg s−1, respectively) and spring tide (31.8, 7.4 and 2x10−3 kg s−1), despite the severe flow regulation, meaning that the system still functions as a source of materials to the coastal sea. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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