Análise do assoreamento do reservatório Ayres de Sousa, Ceará

Abstract

The aim of this study was to analyze the siltation of the Ayres de Sousa dam and to evaluate the impacts of this process on the water availability of the reservoir by bathymetry analysis. The study area comprises the Ayres de Sousa basin, with a drainage area of 1,102.37 km², which is located in the Acaraú hydrographic region, under coordinates UTM - 333157 ° L and 9580522 ° N. The reservoir bathymetry was performed in 2010 by the Water Resources Management Company of Ceará (COGERH) and the results of the volume-area-elevation was compared to the one from the original dam design, from 1936. The Ayres de Sousa reservoir had a capacity reduction of 7.30% in 74 years, corresponding to an average sedimentation rate of 1% per decade. The monitoring of the volume stored should be practiced frequently by management agencies, with the purpose of promoting mitigation actions of these impacts, as well as promoting the sustainability of the activities installed in the water basin of the source. Among the mitigating measures of the silting process are the restoration of riparian forest and the proper management of land use and occupation.