Abstract

MUNOZ, Hipólito et al. Relationship between Dissolved Oxygen, Rainfall and Temperature: Zahuapan River, Tlaxcala, Mexico. Tecnol. cienc. agua [online]. 2015, vol.6, n.5, pp.59-74. ISSN 2007-2422.

The concentration of dissolved oxygen (DO) in the Zahaupan River has decreased over the years due to pollution. The objective of the present work is to identify how DO is related to rainfall and temperature. Measurements of DO were taken at two points (MP1 and MP2) in the river. The Mann-Whitney test was used to compare concentrations at the measurement points and the measurements obtained during the dry and rainy seasons. A relationship was found between DO and the temperature of the river. DO was higher at MP1 (upstream) than at MP2 and significant differences were found between both. Before and during the rainy season, DO values had atypical trends while after the rainy period they were comparable to those reported by the literature. Significant relationships were found between variances and average DO and accumulated rainfall. DO values during the rainy season were higher than those during the dry period and significantly different. It is concluded that DO is related to temperature and that rainfall positively affects DO concentrations in the river.

Keywords : Dissolved oxygen; temperature; rainfall; Zahuapan River.