Hydrologic simulation on basins into Camargos Hydropower Plant Reservoir/CEMIG. / SIMULAÃÃO HIDROLÃGICA NA REGIÃO ALTO RIO GRANDE A MONTANTE DO RESERVATÃRIO DE CAMARGOS/CEMIG

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

VIOLA, Marcelo Ribeiro. Hydrologic simulation on basins into Camargos Hydropower Plant Reservoir/CEMIG. 2008. 120p. Thesis (Master Science in Agricultural Engineering. Soil Water Engineering) - Federal University of Lavras, Lavras - MG Conceptual hydrologic models simulation to basins is one of the most important tools to support water resources management, predicting the hydrologic impacts produced to land-use change. Alto Rio Grande Basin is located in south of Minas Gerais State, and Grande and Aiuruoca rivers are the main tributaries, characterizing two basins with area greater than 2000 km2, draining into Camargos Hydropower Plant Reservoir/CEMIG. The objectives of this work were: 1- to create a semi-conceptual hydrologic model, in lumped and semi-distributed to sub-basins approaches, based on CN-SCS modified to Mishra et al. (2006), and MGB-IPH (Collischonn, 2001) models, GIS and Remote Sensing tools; 2 - to simulate the hydrologic conditions on Rio Grande and Aiuruoca basins, generating an important tool for management and planning of water resources. Precipitation and discharge data sets were obtained from Brazilian National Water Agency (ANA) and reference evapotranspiration (ET0) was obtained from National Institute Meteorology (INMET/5ÂDISME). In order to estimate actual evapotranspiration, crop coefficient and soil moisture and satellite images interpretation, were considered. Long-term hydrologic series were structured for the period between 1990 and 2003. Model calibration period was carried out applying data set of 1990 â 2000, using the Nash-Sutcliffe Statistical Coefficient (CNS) to evaluate the model performance. Validation phase (split simple test) was carried out applying the model calibrated at to the period of 2001 â 2003. In addition, some hydrologic variables estimated by the model, extracted from hydrographs simulated, were compared at to respectively data observed. Statistical precision has showed that the model is able to simulate the hydrologic impacts produced by land-use change on Alto Rio Grande Basin, with CNS greater than 0.7 for calibration and validation phases. The hydrologic impacts on Rio Grande basin produced to grassland area converting to eucalyptus, considering three specific scenarios, were evaluated, predicting flow mean reductions up to 17.8%, basically, due to increase evapotranspiration rate.

ASSUNTO(S)

engenharia de agua e solo 1. modelos hidrolÃgicos. 2. hidrologia. 3. rio grande. 4. rio aiuruoca. 5. uso do solo - impactos hidrolÃgicos. 6. eucalipto.

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