Assessment of seawater mixing in a coastal aquifer by high resolution electrical resistivity tomography

Sathish, S.; Elango, L.; Rajesh, R.; Sarma, V. S.

doi:10.1007/bf03326234

Cited by 42 publications

(12 citation statements)

References 26 publications

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“…The advantages of each of the methods supplement the limitation of the other methods. The most apparent advantage of the combination technique is the reduction in study cost and time without jeopardising the integrity of the data obtained (Maillet et al 2005;Sathish et al 2011). In the present study, the combined the geo-electrical and the geochemical methods were implemented, but emphasis was on the present seawater intrusion status and oil palm cultivation at Carey Island, located on the west coast of Peninsular Malaysia.…”

Section: Introductionmentioning

confidence: 99%

“…Sikandar et al (2010) used integrated a geo-electrical resistivity survey and geochemistry measurements to investigate groundwater conditions in Pakistan. Sathish et al (2011) combined the geo-electrical and the geochemical methods to assess the zone of mixing between seawater and groundwater in the coastal aquifer in South Chennai, in Tamil Nadu, India. Ebraheem et al (2012) conducted a 2D earth resistivity imaging survey in the Wadi Al Bih area in the Northern UAE to determine the potential of the quaternary aquifer and its groundwater quality.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of seawater intrusion to the agricultural sustainability at the coastal area of Carey Island, Selangor, Malaysia

et al. 2012

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Groundwater suitability for agriculture in an island with limited recharge area may easily be intluenced by seawater intrusion. The aim of this study was to investigate seawater intrusion to the suitability of the groundwater for oil palm cultivation at the ex-promontory land of Carey Island in Malaysia. This is the first study that used the integrated method of geo-electrical resistivity and hydrogeochemical methods to investigate seawater intrusion to the suitability of groundwater for oil palm cultivation at two different land cover condition. The relationship between earth resistivity, total dissolved solids and earth conductivity was derived with crop suitability classification according to salinity, used to identify water types and also oil palm tolerance to salinity. Results from the contour conductivity maps show that area facing severe coastal erosion and area still intact with mangrove forest exhibits unsuitable groundwater condition for oil palm at the unconfined aquifer thickness of 15 and 3 1 m, respectively. Based on local sea-level rise prediction and Ghyben-Herzherg assumption (sharp interface), the condition in the study area, especially in severe erosion area, by the twenty-first century will no longer be suitable for oil palm plantation. The application of geo-elechcal method combined with geochemical data, aided with the information on environmental history and oil palm physiography, has demonstrated that the integration of techniques is an effective tool in defining the status of agricultural suitability affected by salinity at the coastal aquifer area.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of seawater intrusion to the agricultural sustainability at the coastal area of Carey Island, Selangor, Malaysia

et al. 2012

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“…For instance, according to Loke and Barker (1996), Loke (2001), and Loke et al (2003), the 2D resistivity imaging technique has higher resolution and provides a better approximation interpretation of the true subsurface geology compared with the VES 1D model technique. Thus, the 2D resistivity imaging technique has been explored in several hydrogeological studies, including those on groundwater pollution (Islami et al 2012), salinity mapping (Pujari and Soni 2009;Sathish et al 2011), and aquifer potential mapping (Ewusi et al 2009;Asry et al 2012). However, 2D resistivity imaging technique application in determining aquifer hydraulic parameters is very limited.…”

Section: Introductionmentioning

confidence: 99%

Groundwater potentiality mapping using geoelectrical-based aquifer hydraulic parameters: A GIS-based multi-criteria decision analysis modeling approach

Mogaji¹,

Lim²

2017

Terr. Atmos. Ocean. Sci.

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This study conducted a robust analysis on acquired 2D resistivity imaging data and borehole pumping test records to optimize groundwater potentiality mapping in Perak province, Malaysia using derived aquifer hydraulic properties. The transverse resistance (TR) parameter was determined from the interpreted 2D resistivity imaging data by applying the Dar-Zarrouk parameter equation. Linear regression and GIS techniques were used to regress the estimated values for TR parameters with the aquifer transmissivity values extracted from the geospatially produced BPT recordsbased aquifer transmissivity map to develop the aquifer transmissivity parameter predictive (ATPP) model. The reliability evaluated ATPP model using the Theil inequality coefficient measurement approach was used to establish geoelectrical-based hydraulic parameters (GHP) modeling equations for the modeling of transmissivity (Tr), hydraulic conductivity (K), storativity (St), and hydraulic diffusivity (D) properties. The applied GHP modeling equation results to the delineated aquifer media was used to produce aquifer potential conditioning factor maps for Tr, K, St, and D. The maps were modeled to develop an aquifer potential mapping index (APMI) model via applying the multi-criteria decision analysis-analytic hierarchy process principle. The area groundwater reservoir productivity potential model map produced based on the processed APMI model estimates in the GIS environment was found to be 71% accurate. This study establishes a good alternative approach to determine aquifer hydraulic parameters even in areas where pumping test information is unavailable using a cost effective geophysical data. The produced map can be explored for hydrological decision making.

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“…In the literature there are many papers [12][13][14][15][16][17][18][19][20][21] concerning the application of the ERT technique to detect the fresh/saltwater sharp interface in groundwater by visualizing the inland zone of saltwater encroachment. Usually ERT is applied to obtain a qualitative result, which is a function of the electrical resistivity contrast between the freshwater and the saltwater contained in the investigated groundwater volume.…”

Section: Introductionmentioning

confidence: 99%

An Integrated Approach Based on Numerical Modelling and Geophysical Survey to Map Groundwater Salinity in Fractured Coastal Aquifers

Masciopinto

Liso

Caputo

et al. 2017

Water

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Abstract:Aquifer over-exploitation may increase coastal seawater intrusion by reducing freshwater availability. Fractured subsurface formations commonly host important freshwater reservoirs along sea coasts. These water resources are particularly vulnerable to the contamination due to seawater infiltration occurring through rapid pathways via fractures. Modeling of density driven fluid flow in fractured aquifers is complex, as their hydrodynamics are controlled by interactions between preferential flow pathways, 3D interconnected fractures and rock-matrix porosity distribution. Moreover, physical heterogeneities produce highly localized water infiltrations that make the modeling of saltwater transport in such aquifers very challenging. The new approach described in this work provides a reliable hydrogeological model suitable to reproduce local advancements of the freshwater/saltwater wedge in coastal aquifers. The proposed model use flow simulation results to estimate water salinities in groundwater at a specific depth (1 m) below water table by means of positions of the Ghyben-Herzberg saltwater/freshwater sharp interface along the coast. Measurements of salinity in 25 boreholes (i.e., salinity profiles) have been used for the model calibration. The results provide the groundwater salinity map in freshwater/saltwater transition coastal zones of the Bari (Southern Italy) fractured aquifer. Non-invasive geophysical measurements in groundwater, particularly into vertical 2D vertical cross-sections, were carried out by using the electrical resistivity tomography (ERT) in order to validate the model results. The presented integrated approach is very easy to apply and gives very realistic salinity maps in heterogeneous aquifers, without simulating density driven water flow in fractures.

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Assessment of seawater mixing in a coastal aquifer by high resolution electrical resistivity tomography

Cited by 42 publications

References 26 publications

Assessment of seawater intrusion to the agricultural sustainability at the coastal area of Carey Island, Selangor, Malaysia

Assessment of seawater intrusion to the agricultural sustainability at the coastal area of Carey Island, Selangor, Malaysia

Groundwater potentiality mapping using geoelectrical-based aquifer hydraulic parameters: A GIS-based multi-criteria decision analysis modeling approach

An Integrated Approach Based on Numerical Modelling and Geophysical Survey to Map Groundwater Salinity in Fractured Coastal Aquifers

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