HR: 1330h
AN: H22C-0941    [PDF]
TI: USE OF TRANSIENT ELECTROMAGNETIC SOUNDINGS (TEM) TO LOCATE URBAN SOLID WASTES DISPOSAL SITES, IN COATZACOALCOS, VERACRUZ, MEXICO.
AU: * Gonzalez-Moran, T
EM: tglez@tonatiuh.igeofcu.unam.mx
AF: INSTITUTO DE GEOFISICA,UNAM, CIUDAD UNIVERSITARIA, MEXICO CITY, DF 04510 Mexico
AU: Hurtado, M
EM: tglez@tonatiuh.igeofcu.unam.mx
AF: INSTITUTO MEXICANO DEL PETROLEO, MEXICO, DF, MEXICO, DF 04510 Mexico
AB: Anthropogenic activities and their impact cause complex alterations in the natural quality of superficial and groundwater. Urban solid waste disposal represented an important source of contamination of groundwater. One of the main problems of the Coatzacoalcos, Veracruz area is the urgent necessity to close some dumps, actually in operation. At present, the municipal government has the project of selecting an urban waste disposal site that fulfills the official ecological norms, with appropriate geologic conditions and a useful life of 15 years. Study area, El Rebozo 1, is covered for sandy - clays from Filisola Formation. Also has outcrops of shales belonging to the Nanchital Formation. This Formation presents low porosity and permeability. It could serve as container in the construction of the landfill. We carried out 6 transient electromagnetic soundings (TEM), to determine the thickness and distribution of this formation in depth and to establish the existence of aquifers. The geophysical studies were carried out along a line of 680 m, with variable separation among stations between 150 m to 250 m, crossing the study area in SW direction. Results of TEM survey, geological, hydrological information and drilling survey confirmed the wide distribution in the studied area of the shale layer from the Nanchital Formation. The average thickness of the shale layer is 70 m and it presents low possibilities of storing an important aquifer. It could be considered as an impermeable layer that can be used as base for the construction of the landfill. Underlying the shale layer there are sandy-clays that could reduce the possible lixiviation from the landfill. Use of TEM provides larger advantages than the conventional electric methods (SEV's) and also more detailed information on the geologic and hydro-geologic conditions from the underground. The integration of geophysical methods with other disciplines allows more integrated systematic research in hydrogeology and contamination processes.
DE: 0600 ELECTROMAGNETICS
DE: 0900 EXPLORATION GEOPHYSICS
DE: 0910 Data processing
DE: 1803 Anthropogenic effects
SC: Hydrology [H]
MN: 2003 Fall Meeting