Avaliação da degradação do Açude Acarape do Meio-CE com uso de modelo matemático e geotecnologia

Abstract

One of the great challenges of environmental management is compatible the preservation with the water multiple uses, with fundamental knowledge of the factors conditioning the changes of the natural conditions of the reservoirs and their watershed. In this context, this paper ad-dresses topics such as: morphometric characterization of the Acarape do Meio (Ceará State) river basin and it hydraulic weir; simulation of hydrodynamic circulation for the year 2012 with the SisBaHiA program, as well as the estimation of the residence time and renewal fees, and to investigate aspects of the evolution of the processes of degradation of water quality, from four satellite images Landsat 5 - TM. From the analysis of the survey results, it was found that the catchment area of the dam Acarape do Meio has approximately 10,31% of the degraded area and it was found that the hydraulic basin has dendritic format with high perimeter development. For the aspects related to environmental modeling, it was estimated that the hydrodynamic behavior of circulating currents showed low speeds, the renewal rate of the water during the rainy season reached 100% in the areas of recesses and also it was found that the residence time is higher in the shallow and dendritic areas. With respect to the presence of active optical components, it was found that there was an increase in the spectral response of Landsat 5 - TM for the 11 years period (2001 to 2011), which relates to the increase of chlorophyll a throughout the years, which is a eutrophication consequence.