Avaliação de métodos para estimativa da evaporação em um reservatório no estado do Ceará

Abstract

The accumulation of water in Brazilian artificial reservoirs is essential to guarantee social well-being and broad development, including in the economic sphere. Studies that allow estimates of evaporation in these structures are of relevant importance for the planning of management policies and management of water resources. Thus, the objective of the present work is to evaluate estimates of water evaporation in a reservoir in the state of Ceará, using different methods and to compare them with each other. The area used as a study was the Santo Anastácio reservoir, also known as Açude da Agronomia, located in the city of Fortaleza - CE. In the development of the work, climatological data from the Pici-UFC meteorological station were used. The parameters used were: precipitation, air temperature, wind speed, humidity and total insolation, and evaporation from the Class A tank, obtained in the form of daily data series, between 2007 and 2019. perform: meteorological characterization of the study area, evaporation estimates using the methods of Penman (1948), Linacre (1977), Linacre (1993), Kohler et al., (1955), Thornthwaite (1948), quantification of evaporation in the Class A tank (ECA), the comparison between the models, in addition to the calculation of correction coefficients (monthly, seasonal and annual) for the tank. The results showed values of evaporation accumulated in the 13 years varying between 1602.52 mm and 3657.95 mm, and values of generic monthly correction coefficients between 0.61 to 1.59; seasonal rainy from 0.79 to 1.64 and dry from 0.58 to 1.11; and annuals ranging from 0.74 to 1.54. With the development of the research, it was found that other evaporation estimation methods should be tested, covering other local factors, thus making the analysis more representative for the reality of the region.