Turbidity Scalar Trend and Flood Pulse at the Curuai Lake Floodplain System
Alcântara, Instituto Nacional de Pesquisas Espaciais, firstname.lastname@example.org
Barbosa, Instituto Nacional de Pesquisas Espaciais, email@example.com
Stech, Instituto Nacional de Pesquisas Espaciais, firstname.lastname@example.org
Shimabukuro, Instituto Nacional de Pesquisas Espaciais, email@example.com
Novo, Instituto Nacional de Pesquisas Espaciais, firstname.lastname@example.org
It is well known that the Amazon flood pulse affects Curuai Lake Turbity by delivering high concentrations of suspended inorganic particle during the flooding stage. However, it is not well know how strong this relationship is along the year and what are the spatial scales at which it holds. In this paper we investigate this relationship in two time scales: at a local scale and high frequency (1 hour) variability and regional scale (seasonally). We used data collected from 20/11/2004 to 26/04/2005 by a turbidity sensor integrated to an automatic data collection system deployed at Curuai Lake for carrying on the local/high frequency analyses. Wavelet Transform(WT) was applyed for the time series analyses. The regional analyses was carried out by applying the Spectral Mixing Model (SMM) to MODIS images acquired at four flood pulse stage: rising (27/02/2004), high (02/05/2004), receding (29/09/2003) and low water level (09/12/2003). The WT results showed that the flood-pulse modulates the turbidity only at a seasonal time scale. At smaller time scales other forcing functions such as wind, water depth and nutrient distribution are more important. The MME results showed that the relationship between the flood pulse and turbidity varies from spatially throughout the hydrological cycle.