Metodologia para modelagem física do assoreamento em reservatórios

ABSTRACT

Reservoirs built in watercourses are subject to some degree of silting. Therefore, it is important to estimate the volume of sediment accumulated, since this deposit may interfere with the functions of the reservoir. One way to do this is by using physical models. However, from the existing literature in the area it is not possible to answer some methodological questions that arise in a physical simulation of the silting, such as: which flow and solid discharge to use? Simulate a hydrogram or constant flow? Thus, this work had as objective to propose a simulation methodology of the silting in physical models, so that when using this methodology the observed siltation in the reduced model could represent the one of the prototype. From numerical and experimental simulations, it was chosen to simulate in the physical model the average flows of the waves that comprised the maximum flows. The flow time of each flow was 30 minutes and the total solid discharges used were those referring to the annual average flow rates. Using this methodology, simulation of sedimentation in the reduced model was promoted for the period between 2013 and 2017, and the result obtained was close to that of the prototype, which indicates that the proposed methodology allowed to represent in the reduced model the phenomenon of sedimentation occurred in the actual reservoir.

Keywords:
Reduced model; HEC-RAS; Hydrogram