Monitoramento e caracterização hidrossedimentométrica de uma pequena bacia hidrográfica periurbana

Abstract

The watershed studied is sub-basin of the watershed of the arroyo Vacacaí Small, in Santa Maria, situated in the High place of the Hill, with coordinated 53°43’41” and 53°44’06” of west longitude and 29°38’47” and 29°39’10” of south latitude, and drainage area of 1,36 km 2. The goals of this work were evaluate the sediments production, starting from discharges mensurations and sediment discharge; evaluate the application of the Universal Equation of Losses of Modified Soil (MUSLE); find a relation between sediments discharge in suspension, obtained with samplers ANA and AMS – 1, and the discharge; find a relation between sediment discharge obtained with sampler of sediments in suspension AMS - 1 and sampler automatic of ascendancy level ANA and to meet a relation between sediments concentration in suspension and the turbidity. For the field measures was built a flume measuring of plan fund, where we setuped the mensuration equipment of the level d’water, and Sampler of Ascending Level (ANA), who water mixture samples collectionsediment. It was built yet, a bridge hidrométrica, for the water mixture collections- sediment with sampler AMS –1 and use of the speed sensor for the mensuration of the speed of the flow. It was obtained a good answer for the evaluation of the sediments production, starting from discharges mensurations and solid, it obtained good correlations between sediments discharge in suspension, obtained with sampler automatic of ascending level (Ana) and with sampler AMS -1 and the discharge. And also we obtained good correlation between solid discharge obtained with sampler of sediments in suspension AMS - 1 and sampler automatic of ascendancy level ANA. They were verified soils losses values, obtained with MUSLE, elevated when compared with measured them in the study section admitting itself these as correct. It was obtained a correlation between sediments concentration and the turbidity of 80%, for values of smaller turbidity than 505 Ntu.