Abstract

The aim of this study was to evaluate the behavior of water conditions due to global warming, examining future water availability in the municipality of Cabaceiras. To investigate the water behavior we performed the calculation of climatic water balance using the methods of Thornthwaite and Mather using monthly precipitation series for the period 1926 to 2011 and temperature data estimated by the software T-Esteem. The results were applied to the medium conditions and then used to scenarios monthly precipitation (reduction of 10.0% and 20.0%) and temperature (increase of 1.0 ° C to 4.0 ° C) to extreme scenarios CO2 emission, optimistic and pessimistic at the same time. It was observed that under drought stress occurs on average every month for the cases of the climatic water balance and simulations reductions of 10 and 20%. The value of annual potential evapotranspiration is approximately four times that of precipitation, evaporation and the value of real equals the annual precipitation. In the water balance simulation with reduced rainfall by 10% and increased by 1.0 º C in the average temperature there is a reduction in rainfall and evaporative, while potential evapotranspiration continues at extreme elevation, the same description can be redone for the scenario with rainfall reduction by 20% and increase of 4.0 ° C mean temperature.

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