NDLI: Combined use of frequency-domain electromagnetic and electrical resistivity surveys to delineate near-lake groundwater flow in the semi-arid Nebraska Sand Hills, USA

Content Provider	Springer Nature Link
Author	Ong, John B. Lane, John W. Zlotnik, Vitaly A. Halihan, Todd White, Eric A.
Copyright Year	2010
Abstract	A frequency-domain electromagnetic (FDEM) survey can be used to select locations for the more quantitative and labor-intensive electrical resistivity surveys. The FDEM survey rapidly characterized the groundwater-flow directions and configured the saline plumes caused by evaporation from several groundwater-dominated lakes in the Nebraska Sand Hills, USA. The FDEM instrument was mounted on a fiberglass cart and towed by an all-terrain vehicle, covering about 25 km/day. Around the saline lakes, areas with high electrical conductivity are consistent with the regional and local groundwater flow directions. The efficacy of this geophysical approach is attributed to: the high contrast in electrical conductivity between various groundwater zones; the shallow location of the saline zones; minimal cultural interference; and relative homogeneity of the aquifer materials.Une reconnaissance électromagnétique domaine-fréquence (FDEM) peut être réalisée pour sélectionner les emplacements les plus favorables à l’exécution de profils géoélectriques. Une prospection FDEM a rapidement établi les direction d’écoulements souterrains et circonscrit les panaches salins dûs à l’évaporation de plusieurs lacs dépendant d’alimentation souterraine dans les Sand Hills, Nebraska, USA. L’instrument FDEM était monté sur un chariot en fibre de verre tiré par un véhicule tous terrains parcourant environ 25 km/jour. Autour des lacs salés, des secteurs présentant une grande conductivité électrique correspondent aux directions régionales et locales d’écoulement souterrain. L’efficacité de cette approche géophysique est attribuée: au fort contraste de conductivité entre les différentes zones aquifères; à la faible profondeur des horizons salins; à une incidence culturale minime; et à la relative homogénéité de l’aquifère.Un relevamiento electromagnético en el dominio de las frecuencias (FDEM) puede ser usado para seleccionar sitios para los más cuantitativos y laboriosos relevamientos de resistividad eléctrica. Un relevamiento FDEM caracterizó rápidamente las direcciones del flujo de las aguas subterráneas y configuró las plumas salinas causadas por la evaporación desde varios lagos dominados por el agua subterránea en Nebraska Sand Hills, EEUU. El instrumento FDEM fue montado sobre un carrete de fibra de vidrio y remolcado por un vehículo todo terreno, cubriendo aproximadamente 25 km/día. Las áreas con alta conductividad eléctrica, alrededor de los lagos salinos, son consistentes con las direcciones de flujo local y regional de las aguas subterráneas. La eficacia de este enfoque geofísico es atribuido a: el alto contraste en la conductividad eléctrica entre distintas zonas de agua subterráneas; la ubicación somera de las zonas salina; las mínimas interferencias culturales; y la relativa homogeneidad de los materiales de los acuíferos.频域电磁(FDEM)可初步为定量度较高和劳动力密集的电阻率调查的区域进行筛选。美国内布拉斯加州沙丘地区存在一些地下水补给为主的湖泊, 湖水蒸发导致地下水矿化度增高。FDEM调查快速刻画了该地区的地下水流向, 确定了咸水晕。FDEM设备被安装在玻璃纤维车上后, 由越野车拖载, 日平均勘查里程约25 km。盐湖周围电导率较高, 与区域和局部地下水流向吻合。这个地球物理方法的有效性归功于不同地下水带电导率差异明显, 咸水带的埋深较浅, 人类活动影响小, 相对均质的含水层介质。A pesquisa electromagnética no domínio da frequência (FDEM) pode ser usada para seleccionar locais para trabalhos intensivos e mais quantitativos de levantamentos de resistividade eléctrica. Uma pesquisa FDEM permitiu caracterizar rapidamente as direcções de fluxo das águas subterrâneas e a configuração das plumas salinas causadas pela evaporação a partir de vários lagos dependentes de águas subterrâneas em Sand Hils, no Nebraska, EUA. O equipamento FDEM foi montado num pequeno atrelado em fibra de vidro e rebocado por um veículo todo-o-terreno, cobrindo cerca de 25 km/dia. Em redor dos lagos salgados, as áreas com elevada condutividade eléctrica são consistentes com os sentidos de fluxo regionais e locais das águas subterrâneas. A eficácia desta abordagem geofísica é atribuída: ao alto contraste de condutividade eléctrica entre as diversas zonas de águas subterrâneas; à baixa profundidade das zonas salinas; à interferência agrícola mínima; e à relativa homogeneidade dos materiais do aquífero.
Starting Page	1539
Ending Page	1545
Page Count	7
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	18
Issue Number	6
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2010-06-09
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Frequency-domain electromagnetic Electrical resistivity Geophysical methods Field techniques Salt-water/fresh-water relations USA 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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