Applicability of Single-Borehole Dilution Tests in Aquifers with Vertical Flow
Metadatos
Mostrar el registro completo del ítemAutor
Calvache Quesada, María Luisa; López Chicano, Manuel; Blanco Coronas, Ángela M.; de la Torre, Beatriz; Duque Calvache, CarlosEditorial
MDPI
Materia
Single-borehole dilution test Upward vertical flow Horizontal groundwater velocity
Fecha
2024-05-03Referencia bibliográfica
Calvache, M.L.; López- Chicano, M.; Blanco-Coronas, A.M.; de la Torre, B.; Duque, C. Applicability of Single-Borehole Dilution Tests in Aquifers with Vertical Flow. Water 2024, 16, 1305. [https://doi.org/10.3390/w16091305]
Patrocinador
project CGL2016-77503-R, which was funded by the Ministerio de Economía y Competitividad (Government of Spain) with FEDER funds of the European Union; RNM-369 of Junta de Andalucía and by Marie Curie International Outgoing Fellowship under grant agreement (624496); Next-Generation EU funding Programa María Zambrano Sénior (REF: MZSA03); Project CGL2016-77503-R, which was funded by the Ministerio de Economía y Competitividad (Government of Spain) with FEDER funds of the European UnionResumen
A set of experimental field single-borehole dilution tests were completed in the Motril–
Salobreña detrital aquifer (Spain) in a sector with coarse material in four different moments under
variable hydrological conditions. The comparative study of the tracer washing, and the temperature
profile patterns for the tests carried out in two wells located hundreds of m from each other, revealed
the presence of ascending vertical flows in one of the wells (not detected by other means) that
compromises the reliability of the tracer test. The values of both the apparent horizontal velocity
and hydraulic conductivity obtained in the affected well were less than half of those estimated in the
well not affected by the upward vertical flows. The repetition of the test eight times during different
seasons showed that the hydraulic conductivity calculated from the apparent horizontal velocity can
vary; therefore, to approximate to a representative hydraulic conductivity value, using this method
is recommended to carry out tests under different hydrological conditions and average the results.
The difference generated by the changes in conditions for the specific setting of the study area was
25%. Taking this into account, it was considered that an approximation to the more representative
value would be an average under variable hydrological conditions, resulting in a horizontal velocity
of 6.7 m/d and hydraulic conductivity of 337 m/d. This information is critical for the management
of the aquifer as it has strategic resources against droughts that are becoming more frequent in the
Mediterranean area.