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Laminar erosion is considered one of the main causes of soil degradation, which results in the loss of soil nutrients and damage to agricultural activities, in addition to polluting and silting up the watercourses of its hydrographic network. Human activity is primarily responsible for the acceleration of this natural process, for the use of land use. To elaborate an adequate environmental planning, it is necessary to diagnose the amount of eroded soil and the places where the loss of sediment is greater. To this end, this article uses the Universal Soil Loss Equation (EUPS) and the Sediment Production Ratio (RPS) in the first order hydrographic basin of the Zaúna stream, in the municipality of Maringá - PR, in order to identify the amount of sediment available, transported and retained. The analyzed period was between the months of July 2016 and June 2017. The results showed smaller amounts of eroded material in the area, with greater emphasis on the classes between 0-3 and 3-5 (ton.saz), separated in seasonal calculations. (4) and annual (2), one considering the exposed soil and the covered soil). The greatest losses of soil in the watershed occurred in the spring season and in the annual calculation of soil exposure. [ABSTRACT FROM AUTHOR]

To understand dynamic of burned areas at Ilha Grande National Park (BINP) remote sensing historical data are excellent alternative. The analyze performance this data for detection burned areas is important to minimize omission and commission errors.Herein, this study analyzed the performance of MOD09 data and Fire_cci and MCD45 products to detect burned areas at Big Island National Park compared to Landsat data between 2007 and 2009. MOD09 data, Fire_cci and MCD45 products were used to map burned areas and compared with burned areas mapped by Landsat data. These investigation demonstrated, MOD09 data showed good spatial agreement in burned area mapping compared with Landsat data (Kappa = 0.88, quantity disagreement = 2.9% and allocation disagreement = 2.8%) as well as burned area values and distribution of burned area (mean overestimated of 10%). MOD09 data showed better performance in detect burned area and is suitable to historical reconstruction the dynamic of burned areas at park. The Fire_cci and MCD45 products do not presenter good performances to detect burned areas and are not suitable to understand the dynamic of burned areas at park. [ABSTRACT FROM AUTHOR]

This study presents an analysis of the sedimentary bed load behavior as well as oscillations in the form of cross sections of the main channels that make up the lower stretch of the Branco river upper basin. The methodology involved the lifting of the channel morphology, the sampling and classification of bed load. The results showed variations in the morphology of cross sections highlighting the profile of Paraíso Farm on the River Tacutu, with erosion of 263.88 m², and profile Island São Lourenço, in the Branco River, which showed deposition of 359.07 m². The survey of bed load indicated the predominance of coarse sand size sediments in the lower course of the Tacutu and Uraricoera rivers. The high Branco river channel presented materials formed mainly by medium sand, followed by coarse sand. The degree of sediment selection, monitoring pointed to a sort of bed load according to the position in relation to the thalweg. [ABSTRACT FROM AUTHOR]

This study aims to characterize the dynamics of suspended sedimentin the basin of Branco river, State of Roraima. The methodology involveda survey of hydrological data from the NationalWater Agency, collection andfurtheranalysisof the loadin suspension andthe lifting of theriver discharge. The study indicateda significantvariation inconcentrations of suspended sediment loadinto riversthat make upthe sourcesof the basin of the Branco River. The highlightin sediment yield was Tacutu river, with a contribution estimated at38%for the discharge of the Branco river (Caracaraí station).The Uraricoera river showed an average contribution of 34%. The surveys showed the important role of the basin in the supply of sediment to the Negro river. [ABSTRACT FROM AUTHOR]