Combined time domain electromagnetic soundings and gravimetry to determine marine intrusion in a detrital coastal aquifer (Southern Spain)

Duque, Carlos; Calvache, María Luisa; Pedrera, Antonio; Martín-Rosales, W.; López-Chicano, M.

doi:10.1016/j.jhydrol.2007.11.031

Cited by 83 publications

(42 citation statements)

References 36 publications

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“…The main recharge of the Motril-Salobreña detrital aquifer comes from the Guadalfeo River, which is a losing stream throughout most of its course, except at its most distal stretch, where the aquifer discharges into the river (Benavente, 1982;Ibáñez, 2005;Calvache et al, 2006;Duque et al, 2008). Part of the river's flow is diverted for crop irrigation above the aquifer.…”

Section: Characterization Of the Aquifermentioning

confidence: 99%

“…The conductivity of the profiles corresponded to freshwater, with maxima never above 1100 µS cm 1 . Subsequently, a geophysical study of time-domain electromagnetic soundings located the saline wedge very close to the coastline (Duque et al, 2008).…”

Section: Characterization Of the Aquifermentioning

confidence: 99%

“…In both cases, the aspects most influencing aquifer heterogeneity both horizontally and vertically are the occurrence of channel deposits (high permeability) and overbank deposits (low permeability) and the change in the positions of these sedimentary facies over time. In fact, lithological columns from boreholes from the mouth of the Guadalfeo River reveal the presence of high-transmissivity sediments at depth, corresponding to a palaeochannel (Duque et al 2008).…”

Section: Numerical Modelmentioning

confidence: 99%

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Numerical modelling of the potential effects of a dam on a coastal aquifer in S. Spain

Calvache

Duque

Martín-Rosales

et al. 2009

Hydrological Processes

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Abstract:This study presents the results of a three-dimensional variable-density numerical modelling of the Motril-Salobreña coastal aquifer and the possible effects of the entry into service in May 2005 of the Rules Dam, located just 17 km from the coast. Present parameters of the Motril-Salobreña aquifer show that the system's conditions are very similar to a natural regime. The dam will substantially alter aquifer recharge, as the entry flow through the alluvial sediments of the Guadalfeo River will be entirely cut off or drastically reduced. Different scenarios reproducing the possible evolution of the aquifer under operation of the Rules Dam have been modelled. In most cases, results indicate that the conditions of the aquifer would worsen, with a general advance of the freshwater-saltwater interface. The area with most risk of saltwater intrusion is the old mouth of the Guadalfeo River, where the mixing zone could advance 1200 m inland. It is proposed that maintaining a 5-6 Mm 3 year 1 'ecological flow' in the Guadalfeo River could prevent this saline advance. This application demonstrates that variable-density models are potentially useful tools for estimating the effects of dams on the hydrodynamic and hydrochemical conditions of a coastal aquifer.

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Section: Characterization Of the Aquifermentioning

confidence: 99%

Section: Characterization Of the Aquifermentioning

confidence: 99%

Section: Numerical Modelmentioning

confidence: 99%

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Numerical modelling of the potential effects of a dam on a coastal aquifer in S. Spain

Calvache

Duque

Martín-Rosales

et al. 2009

Hydrological Processes

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“…3) located near the current riverbed and in the aquifer zone with the highest transmissivity (Calvache et al, 2003). In most cases, the aquifer subtratum could not be reached, hence the data on the depth of the aquifer's impermeable substratum come from geophysical studies (Geirnaert et al,1981;Soto, 1998;Duque et al, 2008). In the study zone, aquifer thickness ranges from 37 m at well 6 to over 250 m at the coastline.…”

Section: Methodsmentioning

confidence: 99%

Processes affecting groundwater temperature patterns in a coastal aquifer

Calvache

Duque

Fontalva

et al. 2011

Int. J. Environ. Sci. Technol.

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ABSTRACT:The temperature depth profiles of six wells in the Motril-Salobren~a aquifer were used as a basis for a comparative analysis involving various parameters to determine their relations and factors influencing the different trends. There is a clear influence of ambient temperature on all the profiles, with a lag time of two to five months. Nevertheless, there are clear differences in the temperature depth profile patterns that can be accounted for by other factors. First, there is a greater influence of localized recharge; Guadalfeo River as opposed to diffuse recharge; irrigation return flow and rainfall. Three of the wells located near the riverbed of the Guadalfeo River have extremely variable temperature-depth profiles and show clear river influence. In springtime, during the highest flood stages of the river due to cold melt water from the Sierra Nevada, the groundwater falls in temperature. During secondary peaks in river flow rates during the autumn due to rainfall, the warm water increases groundwater temperature. The effect of the river recharge decreases with distance from the course since there is less mixing with water from the Guadalfeo River. In addition, there are two temperature-depth profiles in which temperature variations remain shallow and follow a pattern that cannot be attributed to the influence of either of the above two parameters. Among these two cases, the most influential factor is the groundwater flow pattern typical of a discharge zone, characterized by vertical-flow components.

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“…With regards to gravimetry and its applicability to groundwater, Kearey and Brooks (1991) mention the fact that local aquifer geometry could be inferred from mobile gravimetry measurements. Duque et al (2008) further state that gravity should be used in conjunction with other tools, such as time domain electromagnetic soundings and stratigraphy, in order to improve its efficacy as a tool to delineate aquifer boundaries.…”

Section: Introductionmentioning

confidence: 99%