Abstract

ROBLERO-HIDALGO, Rodrigo et al. Daily precipitation concentration index in the Río Grande de Morelia basin. Tecnol. cienc. agua [online]. 2018, vol.9, n.5, pp.170-197.  Epub Nov 24, 2020. ISSN 2007-2422.  https://doi.org/10.24850/j-tyca-2018-05-07.

The daily precipitation concentration index (CI) was evaluated as an indicator to characterize the sub-basins in the hydrological basin, which represent different degrees of pluviometric torrentiality. The CI was estimated using the Lorenz curve to evaluate the relative weight of the rainiest days in the series of daily precipitation data, which was recorded in 34 conventional meteorological stations (CWS) in and near the Río Grande de Morelia basin, from its source upstream of the Cointzio Dam, to its mouth in Lake Cuitzeo. The Río Grande passes through the city of Morelia, which has been affected by floods in a cyclical manner, resulting in serious damage: human losses, damage to infrastructure and deterioration in agricultural, livestock and forestry production. A platform was developed in a GIS for the delimitation and characterization of the basin and its 23 sub-basins. The CI for each CWS was calculated, with which isopleths were generated with intervals of 0.01, as well as a raster layer of the CI. The CI average was calculated for the 23 sub-basins and for the basin. Based on the results, a CI torrentiality scale is proposed, such as: Low torrential (0.476-0.515), medium torrential (0.515-0.538), torrential (0.538-0.560) and high torrential (0.560-0.607). Weighted average for the basin resulted in a CI = 0.55, which corresponds to a torrential basin, and the CI was related to the climate of the basin.

Keywords : Concentration index; torrentiality; isopleths and basin.

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