Hydrosedimentological dynamic on Agua Fria watershed.

摘要

This study surveyed the amount of sediment yielded from the Agua Fria watershed (Palmas, Tocantins, Brazil), from February-1998 to January-1999, and investigated the relations between the sediment yield and some environmental and/or antropic factors, using the Colby's method. The specific sediment yield and sediment delivery ratio were also determined for this period. It was estimated that 138 619 tonnes of sediment were yielded and the specific sediment yield for the study area was 827 tonnes km-2 year-1, while the sediment delivery ratio was 6.2%. The suspended load was the most dominating fraction in almost all the studied period.