Estudo Comparativo Da Evapotranspiração De Referência Entre Localidades No Estado De São Paulo E Na Província De Habana

FAO proposed the reference evapotranspiration to compare evapotranspiration in different areas, because most equations employed in estimating evapotranspiration are empirical and limited to be used in local and climates similar to those in which they were determined. The objective of this study was to analyze the difference in calculated values of ETo for Botucatu and Piracicaba (Brazil) and Güira Melena (Cuba), based on 30-year data. Seasonal differences between years and locations were assessed and subsequently the influence of local climates on these ETo values differences. Climatic elements maximum (Tmax) and minimum temperature (Tmin), relative humidity (RH), wind speed at 2 m height (U2) and solar radiation (n) were obtained from conventional meteorological stations. Evapotranspiration values in Cuba were higher during summer months in the Northern Hemisphere. The highest evapotranspiration values in Botucatu and Piracicaba occurred in summer months in the Southern Hemisphere. Correlation exists between the three locations with the same distance between them. It was concluded from the methodology used that the three localities have different evapotranspiration values and despite being in different hemispheres the evapotranspiration among Piracicaba and Güira Melena are closer than the one verified between Botucatu and Piracicaba. © 2016, Universidade Estadual Paulista - UNESP. All rights reserved.21238439

WATER RESOURCES SUSTAINABILITY AT SÃO MIGUEL DO ANTA COUNTY, MINAS GERAIS, BRAZIL: A SYSTEM DYNAMICS APPROACH. SUSTENTABILIDADE DOS RECURSOS HÍDRICOS NO MUNICÍPIO DE SÃO MIGUEL DO ANTA, MINAS GERAIS, BRASIL: UM ENFOQUE EM DINÂMICA DE SISTEMAS.

The equilibrium between agricultural activities and rational land use, economic development and water  resources  demand is  the  key  factor related  to  biodiversity  preservation  and  minimum environmental impact in São Miguel do Anta County, Minas Gerais State, Brazil. This work analyzes the consequences of life quality improvement of low-income rural families beneficiary of a federal financing program, and its effects on ecology, environment and water resources sustainability. Amodel was implemented, assessing water demand, total annual loads, originated from human and agricultural activities.  Five scenarios were established, considering climate changes and irrigation practices. Results show the possibility of evaluating the consequences of public policies in economy, ecology and sustainability.</p