Author(s): El-Robrini Maamar; Leandro Patrick Ferreira Barbosa
Linked Author(s):
Keywords: Maracana Estuary; Amazon Region; Brazil; Hydrodynamic Circulation; Computational Modeling
Abstract: The Atlantic Coast of Para State is cut by a large number of estuaries. The Am climate (Humid Tropical), is hot and humid, with average annual temperature ranges between 24 °C and 26 °C and relative air humidity ranging 80 % to 90 % . It has two distinct periods: less rainy (June to November) and rainy (December-May), with rainfall 2. 500 mm to 3. 000 mm yr-1. This paper shows the patterns of the neap and spring tides movement in the Maracana estuary, using field data (tides: currents and amplitude) and SisBahia Program as a tool to generate scenarios (high tide, low tide, half flood tide, half ebb tide) in usual wind. The Maracana estuary flow is 103 to 104 m3 s-1 at his mouth, has macro-tidal (> 4 m), half-day, winds (average of 6 m s-1) and tide flow (average of 0, 69 m s-1 in the NE-SW direction). During the spring tide (0 to 1. 17 m s-1), the speed of the currents is higher when compared with those of square (0 to 0. 91 m s-1). SisBahia model results (slake of the flood spring tide: 0. 37 m s-1; slake of low of spring tide: 0. 44 m s-1, half of flood spring tide: 0. 82 m s-1 and a half of ebb spring tide: 1. 17 m s-1) were not measured in the same field (slake of flood spring tide: 0. 17 m s-1; slake of low tide spring: 0. 13 m s-1, half flood of spring tide: 1. 93 m s-1 and half ebb spring tide: 2. 58 m s-1), because of the complexity of the area. The speeds of the tidal currents acquired in the field are compatible with data generated by SisBahia. The geometry of the Maracana estuary contributes to higher the tide in the middle estuary (5. 69 m) than at the upper and middle limit (5. 51 m).
Year: 2013