HYDROSYSSEDIMENTOLOGICAL VARIABLES AND LEVELS OF ENVIRONMENTAL DEGRADATION FROM RAPID EVALUATION PROTOCOLS BETWEEN THE BAY OF STRAW AND THE SADAO IN THE RIVER RIVER OF THE PARAGUAY RIVER

Abstract

The Paraguay River is one of the main modeling agents of the Pantanal environment, its hydromorphological changes are linked to its water regime its river dynamics and anthropic activities. The present study aimed to evaluate the hydrosedimentological aspects and the level of environmental degradation from the application of protocols for the rapid evaluation of rivers - Pars, between the Bay of Palha and Sadao in the river corridor Paraguay. For the development of the research was used some steps. Office work, fieldwork and laboratory work. At the cabinet stage, bibliographical research, cross-sectional profiles and data organization were carried out in the field work, observation; implementation of rapid river assessment protocols; bathymetry and flow velocity, water and sediment sample collection. In the laboratory analysis Analyzes were carried out: granulometric (total dispersion and sieving method), evaporation method (sediment concentration). The Rapid Assessment Protocols indicated regular situations for the left margin of sections 1 and 5. In the cross sections on the Paraguay River, flow velocity ranged from 0.30 to 0.71 m / s, the mean depth of the water sheet between 3.5 to 8.16 m, the flow rate was between 141.90 to 865.57 m³ / s, the solid discharge varied from 245.20 to 1496, t / day. In the sections located in Palha bay flow velocity ranged from 0.09 to 0.97 m / s, the mean depth of the water slide was between 0.46 and 7.06 m, the flow rate was between 0.29 and 673 , 95 m³ / s, and the solid discharge ranged from 53.74 to 2.329,17 t / day. The anthropic use directly influenced changes in the study area in question, but the dynamics of changes in the Paraguay River occur naturally disfiguring their features through sedimentological depositions.