scholarly journals Evaluation of groundwater potential and saline water intrusion using secondary geophysical parameters: A case study from western Maharashtra, India

2018 ◽  
Vol 54 ◽  
pp. 00033 ◽  
Author(s):  
N. Suneetha ◽  
Gautam Gupta
Keyword(s):  
Fresh Water ◽  
Saline Water ◽  
Salt Water ◽  
Rapid Development ◽  
Geophysical Methods ◽  
Groundwater Potential ◽  
Saline Water Intrusion ◽  
Water Intrusion ◽  
Transverse Resistance ◽  
Dar Zarrouk Parameters

Aquifers along the coastal regions around the world are facing severe level of saline water intrusion problems. Rapid development and the associated increase in groundwater withdrawals intensify the problem. Extensive mapping of migration and extent of salt water plumes is difficult and costly. Several surficial geophysical methods have been developed for measuring salinity levels in coastal aquifers. The present study is an attempt to delineate the saline water and fresh water intrusion in parts of west coast of Maharashtra, India. A total of 86 vertical electrical soundings were carried out using the Schlumberger configuration. The contour maps for Dar-Zarrouk parameters viz. the transverse resistance (T), longitudinal conductance (S), and coefficient of anisotropy (λ) were computed at 84 sites to generate the resistivity regime of saline and fresh water bearing formations. The results exemplify that the Dar-Zarrouk parameters provide a practical elucidation in demarcating the saline and fresh water aquifers, particularly when the resistivity data interpretation encounters constraints due to intermixing of saline water aquifers, fresh water aquifers etc. Several NE-SW and NW-SE oriented major lineaments and its cris-crosses have been observed in this region.

scholarly journals Studies on saline water intrusion in the coastal stretch of Kadalundi river basin, Malappuram district, Kerala using visual MODFLOW – A case study.

2020 ◽  
Author(s):  
Sajeena S ◽  
Swathy P.S ◽  
Abdul Hakkim V. M.
Keyword(s):  
Ground Water ◽  
Contaminant Transport ◽  
Fresh Water ◽  
River Basin ◽  
Saline Water ◽  
Quality Data ◽  
Visual Modflow ◽  
Water Quality Data ◽  
Saline Water Intrusion ◽  
Water Intrusion

Abstract The study on simulation of sea water intrusion into the coastal aquifers using Visual MODFLOW was conducted on coastal stretch of Tanur, Tirurangadi and Parappanagadi blocks of the Kadalundi river basin and this area comprises of about 130 km2 drainage area. The base map of the study area was imported into the model in BMP format and divided into 40 columns and 40 rows (1600 cells). Water level and water quality data of observation wells maintainedby Ground Water Department, Govt. of Kerala was used as input to the model. Secondary data on hydrogeological parameters and aquifer properties were also used as the input parameters of the model. In this study, Visual MODFLOW 2.8.1 integrated with MT3D software was used for groundwater modelling and contaminant transport modelling. It was observed that there is a chance of saline water intrusion in the coastal stretch of study area. There are chances of saline water intrusion to a lateral distance of 0.5 km to 1.9 km from the coast which extents 3.2 to 4.5km along the coast from northern boundary of Kadalundi river basin. Coconut retting, lime shelling and sand mining activities in the river basin were a potential source of pollution and contaminant transport. Development of small industries, construction of buildings and agricultural activities in the coastal stretch of river basin necessitated increased rate of pumping of ground water. This increased pumping of ground water leads to the entry of salt water into the fresh water aquifer formations. Global warming and sea level rise are also threatening problems in the current climate change scenario which is also a reason for saline water intrusion in to the coastal fresh water aquifers. Groundwater replenishment through natural and artificial recharge and sustainable development activities in the area are the main countermeasures to overcome this problem.

scholarly journals Geophysical and stratigraphical research into deep groundwater and intruding seawater in the mediterranean area (the Salento Peninsula, Italy)

2005 ◽  
Vol 5 (1) ◽  
pp. 127-136 ◽  
Author(s):  
S. Margiotta ◽  
S. Negri
Keyword(s):  
Cross Sections ◽  
Saline Water ◽  
Geophysical Methods ◽  
Mediterranean Area ◽  
The State ◽  
Electrical Tomography ◽  
Deep Aquifer ◽  
Saline Water Intrusion ◽  
Water Intrusion ◽  
The North

Abstract. Geological, geophysical and hydrological surveys were performed in an area between Lecce to the North and Otranto to the South on the Lower Adriatic coast of Italy in order to verify the ``state of health'' of the ground water in the deep aquifer, which is characterised by Mesozoic carbonatic formations and is permeable due to fracturing and karstic phenomena. This area was chosen because it is highly urbanised, and contains many wells, some of which were intensively studied from a geological and hydro-geological point of view in 1987. The first phase of the research consisted of a stratigraphical and geological study, based on geological surveys of the surface and the subsoil by direct observation of borehole cores and the collection and analysis of existing stratigraphical data on wells in the area. The stratigraphical and hydrogeological data are kept in the archives of local agencies. The collected data were organised in a single database managed by an appropriate software (ARCVIEW). Numerous geological cross sections of the territory were studied in order to characterise the subsoil. Subsequently, multi-parameter surveys (O2, pH, temperature, TDS, conductivity) were carried out on the water-column of certain wells selected from those studied in 1987. This was to verify possible changes in the state of the groundwater since 1987. The surveys were carried out in two different periods (May and September) in order to identify potential differences between rainy and dry periods. Moreover, electrical tomography was used to characterise the various subsurface geological formations and possible saline water intrusion where direct information collected from the wells was lacking. From the research conducted it was possible to effect a stratigraphical characterisation of the subsoil and to verify overexploitation of the water resources resulting from the increasing number of wells, and the consequent deterioration of the aquifer due to saline water intrusion. The research also confirms the validity of geophysical methods for the study of hydro-geological issues.

scholarly journals GEOELECTRIC STUDY OF GROUNDWATER REPOSITORY IN PARTS OF AKWA IBOM STATE, SOUTHERN NIGERIA

2020 ◽  
Vol 4 (2) ◽  
pp. 99-102
Author(s):  
Johnson C. Ibuot ◽  
Moses M. M. Ekpa ◽  
Doris O. Okoroh ◽  
Aniefiok S. Akpan Emmanuel T. Omeje
Keyword(s):  
Hydraulic Conductivity ◽  
Groundwater Potential ◽  
Vertical Electrical Sounding ◽  
Protective Capacity ◽  
Longitudinal Conductance ◽  
Contour Maps ◽  
Transverse Resistance ◽  
Southern Nigeria ◽  
Electrical Sounding ◽  
Dar Zarrouk Parameters

Geoelectric survey employing Vertical Electrical Sounding (VES) was carried out in order to assess the groundwater repositories. A total of seven soundings were obtained with their layer resistivity, thickness and depth within the maximum electrode separation. The geoelectric parameters obtained were used to estimate the Dar-Zarrouk parameters (longitudinal conductance and transverse resistance), hydraulic conductivity and transmissivity. The result shows the aquifer resistivity ranging from 77.14 to 784.76 Ωm, with thickness ranging from 28.78 to 80.04 m. The longitudinal conductance have values ranging from 0.071 to 0.825 Ω-1 while the values of hydraulic conductivity and transmissivity range from 1.087 to 5.881 m/day and 60.180 to 374.031 𝑚2/day respectively. The contour maps generated show the variation of these parameters across the subsurface, and areas with poor protective capacity were delineated. The results also delineate the groundwater potential of the study area as moderate, while the corrosivity rating indicates non-corrosive and slightly corrosive.

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