Abstract

MONREAL, Rogelio et al. Application of DInSAR to subsidence studies in the Mexicali Valley. Bol. Soc. Geol. Mex [online]. 2011, vol.63, n.1, pp. 119-135. ISSN 1405-3322.

A method for defining hydrostratigraphic units is herein proposed, and various definitions of hydrostratigraphic units previously proposed are analyzed. Nevertheless, none of the definitions are widely accepted; therefore, the hydrostratigraphic units proposed here are defined using the lithologic characteristics of the sediments along with the values of hydraulic conductivity. A methodology to define hydrostratigraphic units in granular aquifers is proposed. The case of the Yaqui River aquifer is analyzed here and the hydrostratigraphic units are defined based on the characteristics of the sediments filling the basin, which correspond to fluvial sedimentary environments. Five hydrostratigraphic units were identified in the aquifer. Also, with the interpretation of the hydrostratigraphy, it was possible to determine the kind sediments present at different depths, thereby recognizing the presence of the ancient river channel of the Yaqui River.

Keywords : hydrostratigraphic unit; methodology; hydrogeologic model.