CICLO HIDROLÓGICO NOS AMBIENTES DE VÁRZEA DA RESERVA DE DESENVOLVIMENTO SUSTENTÁVEL MAMIRAUÁ – MÉDIO RIO SOLIMÕES, PERÍODO DE 1990 A 2008.

E. E. Ramalho, J. Macedo, T. M. Vieira, J. Valsecchi, J, Calvimontes, M. Marmontel, H. L. Queiroz

Abstract


The flood pulse is a key factor in the ecological processes of the várzea. This study aims to describe water level variation at a várzea site in the Middle Solimões river region (Amazon River). The study took place in Mamirauá Sustainable Development Reserve from 1990 to 2008. During this period, water level varied between a minimum of 21,71 and a maximum of 38,55 meters above sea level. Average annual amplitude was 10,60 meters (n =17, s.d. = 1,84). The three highest water levels were registered in 1997, 1998, and 1999, whereas the lowest were registered in 1991, 1992, and 1995. The study showed that high water level periods, or floods, occur from May until mid-July, whereas low water levels, or dry periods, occur in the months of September, October, and November. Flooding periods begin in the end of November and end in the beginning of May, whereas, drying periods - when water levels fall - start mid-July and end in the beginning of September. The annual flooding pattern has followed a similar model created from monthly water level averages. Markedly different oscillations were observed in 1992, 1995, 1997, and 2004. Through the monitoring of water level variations in the Mamirauá Reserve it was possible to characterize the flood pulse in the middle Solimões river region - a variable to be compared with other environments in the Amazon basin.

Keywords


Reserva de Desenvolvimento Sustentável Mamirauá; Várzea; Pulso de inundação; Amazônia; Médio Rio Solimões; Mamirauá Sustainable Development Reserve; Flood pulse; Varzea; Amazon; Solimões River



DOI: https://doi.org/10.31420/uakari.v5i1.57