Resumo Objetivou-se, com o presente trabalho, avaliar duas metodologias de amostragem de água (amostra coletada na profundidade de 15-30 cm e amostra integrada), para determinação de variáveis limnológicas em uma seção transversal do rio Catolé Grande, em diferentes níveis de vazão. Foram quantificadas as variáveis turbidez, pH, condutividade elétrica, oxigênio dissolvido e coliformes totais. A comparação dos resultados obtidos, segundo as diferentes metodologias de coleta utilizadas foi realizada utilizando os índices estatísticos eficiência do modelo e coeficiente de determinação e por meio de análise de regressão linear. Houve pequena influência das metodologias de amostragem em relação às variáveis turbidez, condutividade e coliformes totais. Para a variável pH, a amostragem realizada de 15-30 cm de profundidade ocasionou superestimativa dos valores quando comparados à amostra integrada. Com relação à variável oxigênio dissolvido, os valores obtidos a partir da amostragem de 15-30 cm tedem a superestimativas quando as concentrações são inferiores a 6,5 mg L-1, entretanto, quando a concentação é superior a esse valor, esse tipo de amostragem tende a subestimar quando comparada aos valores obtidos por meio da amostra integrada. | Abstract This study evaluated water sampling methodologies for determining limnological variables in a cross section of the Catolé Grande River at different flow rates. Samples were collected at depths of 15-30 cm and compared with integrated samples. The variables of turbidity, pH, electrical conductivity, dissolved oxygen and total coliforms were quantified. The results were compared, according to the different collection methodologies, using the statistical index, model efficiency, coefficient of determination, and linear regression analysis. There was little influence of the sampling methodologies in relation to turbidity, conductivity and total coliforms variables. For the pH variable, the sampling performed at 15-30 cm depth caused overestimation when compared to the integrated sample. Regarding the dissolved oxygen variable, the values obtained using 15-30 cm samples tend to overestimate when the concentrations are lower than 6.5 mg L-1;however, when the concentration is higher than this value, this type of sampling tends to underestimated when compared to values obtained using the integrated samples.

Se presenta una metodología para analizar la pre-factibilidad técnica del aprovechamiento de la energía eólica, para el suministro eléctrico en plantas potabilizadoras de agua (PTAP), a través del tratamiento estadístico de registros climatológicos, el cálculo de la oferta energética y el dimensionamiento del aerogenerador. Adicionalmente, se muestra un nomograma para el cálculo de las anteriores variables, a partir de los registros de seis PTAP de la Sabana de Bogotá (Colombia): Principal, El Sosiego, Sibaté, Pablo VI, El Dorado y Yomasa. Las dos últimas PTAP, se tomaron como casos principales de estudio. Los resultados mostraron, para las PTAP El Dorado y Yomasa, a partir de sus caudales (337,2 y 12,1L/s) y consumos energéticos máximos (37.322 y 3.571kWh), que las condiciones climatológicas presentes a las alturas de diseño (50 y 10m) ofertaron una potencia eólica específica de 245,3 y 67,6W/m², respectivamente. Por otro lado, se observó la existencia de una relación lineal entre el caudal tratado y la energía consumida por las seis PTAP en estudio (R²= 0,99). Finalmente, al aplicar el nomograma de diseño eólico a las PTAP El Dorado y Yomasa, se evidenció un error medio de 0,54% y 1,25% en el cálculo de la energía consumida y la potencia eólica, respectivamente. | A methodology to analyze the technical pre-feasibility of the use of wind energy for electricity supply in water purification plants (WPP), through the statistical treatment of weather records, the calculation of the energy supply and the sizing of the wind turbine is presented. Additionally, a nomogram for calculation of the above variables from the records of six WPP of the Sabana de Bogotá (Colombia): Principal, El Sosiego, Sibaté, Pablo VI, El Dorado and Yomasa is exhibited. The last two WPP were taken as main study cases. The results showed for the WPP El Dorado and Yomasa from its maximum flow (337.2 y 12.1L/s) and energy consumption (37,322 and 3,571kWh) that the weather conditions present at the heights of design (50 and 10m) offer a specific wind power of 245.3 and 67.6W/m², respectively. On the other hand, the existence of a linear relationship between the flow treated and the energy consumed by the six WPP in study (R² = 0.99) was noted Finally, the application of wind design nomogram to WPP El Dorado and Yomasa presented an average error of 0.54% and 1.25% in the calculation of the energy consumed and wind power, respectively.

This study shows the most important chemical characteristics of throughfall and stemflow in three species of Mediterranean holm-oak forest (Quercus ilex, Arbutus unedo y Phillyrea media), as well as their relationship with rainfall water chemistry and dry deposition. At the same time, it compares 3 models to evaluate the importance and amount of wet and dry deposition, as well as of leaching, in nutrients present in throughfall and stemflow.