Correlación entre la conductividad hidráulica y la resistividad eléctrica de depósitos volcánicos del Chimborazo en la Cuenca baja del Río Chambo, Provincia de Chimborazo.

Abstract

This study presents a correlation between the hydraulic conductivity and the electrical resistivity of the volcanic-sedimentary deposits of the lower basin of the Chambo River (CBRCH), Chimborazo province. This was base on the laboratory analysis of 10 soil samples collected in the June/July 2019 field campaign were analyzed in the laboratory in the sectors of Llío, San Pablo, Guano, San Vicente de Los Elenes, Riobamba, and Cubijíes. Through laboratory analysis of the samples, porosity, intrinsic permeability, saturation, and moisture content were determined. From the correlation of these parameters and pumping tests of the Llío, Riobamba and Yaruquíes wells, the hydraulic conductivity of the potential hydrogeological units outcropping in the basin was obtained. Its electrical resistivity was also analyzed through vertical electrical soundings and electrical tomographies collected from previous projects (PMI-1502; EP-EMAPAR, 2008-2010). The information obtained was statistically analyzed in order to determine trends and correlate with the zoning of the study area based on the soil texture. In this way, 3 possible aquifer zones were determined corresponding to the Llío-Guano aquifer (zone 3), Riobamba (zones 1 and 2) and Yaruquíes (zones 2 and 4). Hydraulic conductivity values were high 1000 (m/day) in Llío-Guano and low 0.00153 (m/day) in Yaruquíes. Regarding electrical resistivity, the highest values were correlated with 9500 (μΩ) in Llío-Guano and the lowest with 20 (μΩ) in Yaruquíes. Concluding as potential Hydrogeological Units the Yaruquíes, Cizarán, Riobamba, Chambo, Cangahua and volcanic Igualata, El Altar, Chimborazo Formations that constitute the aquifers.