The water crisis in artificial reservoirs have direct influence on the availability in quantity and quality of water for public supply. The Itupararanga and Rappbode reservoir supplying millions of people in the regions where they live and have great social and economic importance. The project aims to quantify the particle removal and carbon storage in the sediments as well as the identification of sources within the catchment by using different extraction and fractionation schemes for carbon and humic substances. To get these ambiguous goals the following steps have to be conducted: a) Sampling of water and suspended particulate matter (SPM) at the main inflows at different season and within the lake water column; b) Measurement of discharge of the main tributaries during the water sampling; c) Chemical analyses of nutrients and major ions within the water samples; d) Isotopic analyses of organic carbon of the water and the SPM; e) Fluorescence characterization of the water samples; f) Installation of sediment traps within the water column to collect settling particles (seston); g) Sampling of seston and determination of carbon and nitrogen concentrations and organic carbon isotopic composition; h) Sampling of sediment material at several positions along the dam to quantify the amount of carbon within the top layer of the sediment; i) Analyses of the isotopic composition of the sediment for organic carbon; j) Extraction, purification and enrichment of humic substances from sediment porewater and soil water DOC; k) Determination of HS concentration and chemical and isotopic characterization; l) Evaluation of the land use within the catchment of the dam (preferentially by GIS); m) Sampling of typical soil within the different subcatchments and determination of carbon and nitrogen concentrations and organic carbon isotopic composition; n) Calculation and balance for the organic carbon cycles of the dam. The studies will be conducted in standardized procedures by Groups from Germany and Brazil so that the results can also have the global reach necessary to understand the processes that control the distribution and transport of carbon reservoirs with distinct characteristics.
News published in Agência FAPESP Newsletter about the scholarship: