NDLI: Geophysical characterization of the León-Chinandega aquifer, Nicaragua

Content Provider	Springer Nature Link
Author	Corriols, Marvin Dahlin, Torleif
Copyright Year	2007
Abstract	Electrical geophysical surveys in the mode of vertical electrical soundings (VES) and continuous vertical electrical soundings (CVES) were conducted in the León-Chinandega plains, northwestern Nicaragua, in order to obtain detailed information about the geometry of the different hydrogeological layers in the aquifer and depth to the basement. A total of 51 VES were carried out within the plains. The results show a complex structure towards the north east of the area, and the southwestern part of the plains presents a smoother stratification. The geoelectrical measurements and borehole information indicate that the basement topography is characterized by hills and deep valleys with highly variable basement depths. Fifty CVES where done in a smaller area in the center of the plain. The resistivity data yielded considerable information revealing the existence of two main geo-electrical units. The combined interpretation of geological and geophysical data shows an environment typical of sedimentary volcanic coastal plains. The information collected during this investigation provides valuable data for estimating the fresh-water resources of the León-Chinandega aquifer system and for development of a groundwater management plan.Des études géophysiques électriques de types sondages electriques verticaux (VES) et sondages electriques verticaux continus (CVES) ont été réalisées dans les plaines de León-Chinandega, dans le Nord-Ouest du Nicaragua, de manière à obtenir des informations détaillées sur la géométrie des différentes couches hydrogéologiques de l’aquifère ainsi que la profondeur du socle. Un total de 51 VES a été réalisé dans les plaines. Les résultats montrent une structure complexe vers le Nord-Est de la zone, tandis que la partie Sud-Ouest des plaines présente une stratification plus douce. Les mesures géo-électriques et les informations des forages indiquent que la topographie du socle est caractérisée par des collines et des vallées profondes avec des élévations du socle très variables. Cinquante CVES ont été réalisés dans une zone plus petite au centre de la plaine. Les données de résistivité ont apporté des informations considérables révélant l’existence de deux unités géo-électriques principales. L’interprétation combinée des données géologiques et géophysiques caractérise un environnement typique de plaines côtières sédimentaires volcaniques. L’information collectée lors de cette étude apporte des données qui peuvent servir à l’estimation des ressources en eau douce du système aquifère de León-Chinandega et à l’élaboration d’un plan de gestion des eaux souterraines.Estudios geoelectricos en la modalidad de sondeos eléctricos verticales (SEV) y sondeos eléctricos verticales continuos (SEVC) fueron realizados en la planicie de León-Chinandega, nor-oeste de Nicaragua, para obtener información detallada de la geometría de las diferentes capas hidrogeológicas en el acuífero y la profundidad al basamento. Un total de 51 SEV fueron realizados en la planicie. Los resultados muestran una estructura compleja hacia el nor-este del área, la parte sur-oeste de la planicie presenta una estratificación más simple. Las mediciones geoeléctricas y la información de pozos indican que la topografía del basamento está caracterizada por colinas y valles profundos con grandes variaciones en las profundidades del basamento. Cincuenta SEVC fueron realizados en un área más pequeña en el centro de la planicie. Los datos de resistividad brindaron considerable información revelando la existencia de dos unidades geoeléctricas principales. La interpretación combinada de los datos geológicos y geofísicos muestra un ambiente típico de las planicies volcano-sedimentarias costeras. La información obtenida durante esta investigación provee información valiosa para la estimación de los recursos de agua potable del sistema acuífero de León-Chinandega y para el desarrollo de un plan de manejo de las aguas subterráneas.
Starting Page	349
Ending Page	362
Page Count	14
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	16
Issue Number	2
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-01-25
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geophysical methods Vertical electrical soundings Aquifer geometry Coastal aquifers Nicaragua Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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