Célio Orli Cardoso

Temperaturas superficiais de telhas e sua relação com o ambiente térmico

The objective of this study was the analysis of temperatures of clay tiles, galvanized steel tiles and fiber-cement tiles with white painting on the roof and his relation with the thermal environment, in winter and summer conditions. The experiment was carried out in models of constructions quantifying the internal and extern temperatures from the tiles (TS), Temperature and humidity index (THI), Black Globe and Humidity (BGHI) and Thermal Load of Radiation (TLR) were employed for the characterization of the thermal environmental. The measured were performed inside and outside the housing. The results showed that the ceramic tiles and the fiber-cement tiles presented similar thermal behaviors and the choice of fiber-cement tiles of 5 mm with white painting on the roof is economically advantageous. The metal tiles were the ones that most heated up surpassing 53oC in his surface and the worst regarding to the thermal comfort compared with the other tiles. The THI was not accurate for determining thermal comfort under tropical conditions. There was significant reduction of RTL by the tiles to the not shaded area.

Analysis of probable monthly rainfall in the municipality of Lages, SC

In this study, monthly rainfall time-series with 80 years of collected data were analyzed and adjusted using gamma distribution in order to determine the expected monthly rainfall for Lages, in the State of Santa Cararina. The method of adjustment of model was used to estimate α and β parameters of gamma distribution, and Kolmogorov-Smirnovs test assessed the models fitting to the data. Gamma distribution fitted to observed data of all months of the year (p x). The results showed that the monthly mean rainfall, for all months of the year, occurred at probability level of 31.93% with variation coefficient of 3.63%. Considering these results, it is proved that the found mean values should not be used as parameters in agricultural projects. For all months of the year, the difference between monthly mean rainfall and probable rainfall were 64.49 mm (51.3%) and 73.03 mm (58.1%), at probability levels of 75 and 80% respectively.

Generation of intensity duration frequency curves and intensity temporal variability pattern of intense rainfall for Lages/SC

The objective of this work was to analyze the frequency distribution and intensity temporal variability of intense rainfall for Lages/SC from diary pluviograph data. Data on annual series of maximum rainfalls from rain gauges of the CAV-UDESC Weather Station in Lages/SC were used from 2000 to 2009. Gumbel statistic distribution was applied in order to obtain the rainfall height and intensity in the following return periods: 2, 5, 10, 15 and 20 years. Results showed intensity-duration-frequency curves (I-D-F) for those return periods, as well as I-D-F equations: i=2050.Tr0,20.(t+30)-0,89, where i was the intensity, Tr was the rainfall return periods and t was the rainfall duration. For the intensity of temporal variability pattern along of the rainfall duration time, the convective, or advanced pattern was the predominant, with larger precipitate rainfalls in the first half of the duration. The same pattern presented larger occurrences in the spring and summer stations.

Corn performance with late sowing in Planalto Catarinense, Brazil, simulated with CERES-maize model

This work had the objective to investigate the delay effects in the sowing date on corn establishment, cycle duration and yield through the computer simulations using CERES-Maize model, in order to help agrarian producers from the Mountainous Area of Santa Catarina, Brazil to take better decisions on it. The computer simulations showed that: 1)the risks on corn establishment increased due to the delay of sowing during the studied years; 2) in some years, its cycles were drastically affected for the lower temperatures; 3) the cycle durations were longer when confronted with the low temperatures; 4) corn income decreased when the cycles were confronted with the low temperatures, water deficiency and low solar radiation; 5) potential incomes averaged 4944 kg ha-1, and under the natural rain conditions averaged 2490 kg ha-1, during all the months analyzed from October to March; 6) besides January, the exploration of this cultivar was not viable because of the high risk of the crop frustration associated to the same ones, due to the thermal conditions (low temperatures and frost).