Saltwater intrusion of the Costa de Hermosillo aquifer, Sonora, Mexico: a numerical simulation
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
1998
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| _version_ | 1876428442979794944 |
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| author | E. L. Flores Márquez |
| author_facet | E. L. Flores Márquez |
| contents | Saltwater intrusion of the Costa de Hermosillo aquifer, Sonora, Mexico: a numerical simulation E. L. Flores Márquez R. E. Chávez Segura J. A. Castro García J. O. Campos Enríquez Ciencias de la Tierra Hydrology inversion gravimetry numerical model saltwater intrusion Inversion of gravity data enabled us to obtain the basement topography of the Costa de Hermosillo aquifer. The depth to thebasement ranges from 300 to 3500 m, and has a complex character. Between Hermosillo and Kino Bay, the basement constitutesa subcircular structural high. Around this structural high basement is characterized by a series of horsts and grabens. Severalgrabens are interconnected, allowing the flow of seawater inland. The horsts act as barriers to the seawater flow. The pattern oftotal dissolved solids in groundwater supports this interpretation. Gravity data also suggest the existence of tectonic lineamentscorrelating with the southward prolongation of the Cerro Prieto fault, and with the Craton margin lineament. From electricalresistivity distribution the seawater front extends inland more than 25 km and is more than 200 m deep. Based on boreholeinformation and on the electrical resistivity distribution we inferred the stratigraphy of the aquifer. Geophysical, geological andgeohydrological information were used to derive a geological model for the Costa de Hermosillo aquifer, which was subsequentlyused in a 2-D numerical simulation of salt water intrusion. A non-dimensional formulation based in the equations of Darcy, ofcontinuity (for the water and for the salt, respectively) and in a constitutive relation (fluid density and salt concentration), was usedto simulate the seawater intrusion. The resulting equations were solved, through a finite difference scheme, for the parametrizedgeologic model along selected profiles.We find an advective pattern where no barrier exists to the seawater flow. However, those sections separated by intrusives orhorsts show convective cells. The aquifer flow is complicated by the changing nature of the sedimentary infill and the overexploitationof the aquifer in the zone. Assuming the present rate of withdrawal the steady-state simulated reproduces salt concentrationagrees with the observed values. 1998 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56837301 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.3 Vol.37 |
| format | Artículo científico |
| id | redalyc_56837301 |
| institution | Redalyc |
| language | en |
| publishDate | 1998 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Saltwater intrusion of the Costa de Hermosillo aquifer, Sonora, Mexico: a numerical simulation E. L. Flores Márquez Ciencias de la Tierra Hydrology inversion gravimetry numerical model saltwater intrusion Saltwater intrusion of the Costa de Hermosillo aquifer, Sonora, Mexico: a numerical simulation E. L. Flores Márquez R. E. Chávez Segura J. A. Castro García J. O. Campos Enríquez Ciencias de la Tierra Hydrology inversion gravimetry numerical model saltwater intrusion Inversion of gravity data enabled us to obtain the basement topography of the Costa de Hermosillo aquifer. The depth to thebasement ranges from 300 to 3500 m, and has a complex character. Between Hermosillo and Kino Bay, the basement constitutesa subcircular structural high. Around this structural high basement is characterized by a series of horsts and grabens. Severalgrabens are interconnected, allowing the flow of seawater inland. The horsts act as barriers to the seawater flow. The pattern oftotal dissolved solids in groundwater supports this interpretation. Gravity data also suggest the existence of tectonic lineamentscorrelating with the southward prolongation of the Cerro Prieto fault, and with the Craton margin lineament. From electricalresistivity distribution the seawater front extends inland more than 25 km and is more than 200 m deep. Based on boreholeinformation and on the electrical resistivity distribution we inferred the stratigraphy of the aquifer. Geophysical, geological andgeohydrological information were used to derive a geological model for the Costa de Hermosillo aquifer, which was subsequentlyused in a 2-D numerical simulation of salt water intrusion. A non-dimensional formulation based in the equations of Darcy, ofcontinuity (for the water and for the salt, respectively) and in a constitutive relation (fluid density and salt concentration), was usedto simulate the seawater intrusion. The resulting equations were solved, through a finite difference scheme, for the parametrizedgeologic model along selected profiles.We find an advective pattern where no barrier exists to the seawater flow. However, those sections separated by intrusives orhorsts show convective cells. The aquifer flow is complicated by the changing nature of the sedimentary infill and the overexploitationof the aquifer in the zone. Assuming the present rate of withdrawal the steady-state simulated reproduces salt concentrationagrees with the observed values. 1998 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56837301 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.3 Vol.37 |
| title | Saltwater intrusion of the Costa de Hermosillo aquifer, Sonora, Mexico: a numerical simulation |
| topic | Ciencias de la Tierra Hydrology inversion gravimetry numerical model saltwater intrusion |
| url | https://www.redalyc.org/articulo.oa?id=56837301 |