| Abstract | A new method to study 3D saline front advancement in coastal fractured aquifers has been
presented. Field groundwater salinity was measured in boreholes of the Bari (Southern Italy) coastal
aquifer with depth below water table. Then, the Ghyben-Herzberg freshwater/saltwater (50%) sharp
interface and saline front position were determined by model simulations of the freshwater flow
in groundwater. Afterward, the best-fit procedure between groundwater salinity measurements,
at assigned water depth of 1.0 m in boreholes, and distances of each borehole from the modelled
freshwater/saltwater saline front was used to convert each position (x, y) in groundwater to the
water salinity concentration at depth of 1.0 m. Moreover, a second best-fit procedure was applied
to the salinity measurements in boreholes with depth z. These results provided a grid file (x, y, z,
salinity) suitable for plotting the actual Bari aquifer salinity by 3D maps. Subsequently, in order
to assess effects of pumping on the saltwater-freshwater transition zone in the coastal aquifer, the
Navier-Stokes (N-S) equations were applied to study transient density-driven flow and salt mass
transport into freshwater of a single fracture. The rate of seawater/freshwater interface advancement
given by the N-S solution was used to define the progression of saline front in Bari groundwater,
starting from the actual salinity 3D map. The impact of pumping of 335 L/s during the transition
period of 112.8 days was easily highlighted on 3D salinity maps of Bari aquifer. |
| Text | 349564 2016 10.3390/computation4010009 coastal aquifers; tracer tests; over abstraction; modeling; salinity maps in 3D A New Method to Infer Advancement of Saline Front in Coastal Groundwater Systems by 3D The Case of Bari Southern Italy Fractured Aquifer Costantino Masciopinto Consiglio Nazionale delle Ricerche, Istituto di Ricerca Sulle Acque, Reparto di Chimica e Tecnologia delle Acque, 5 via Francesco De Blasio, 70132 Bari, Italy A new method to study 3D saline front advancement in coastal fractured aquifers has been presented. Field groundwater salinity was measured in boreholes of the Bari Southern Italy coastal aquifer with depth below water table. Then, the Ghyben Herzberg freshwater/saltwater 50% sharp interface and saline front position were determined by model simulations of the freshwater flow in groundwater. Afterward, the best fit procedure between groundwater salinity measurements, at assigned water depth of 1.0 m in boreholes, and distances of each borehole from the modelled freshwater/saltwater saline front was used to convert each position x, y in groundwater to the water salinity concentration at depth of 1.0 m. Moreover, a second best fit procedure was applied to the salinity measurements in boreholes with depth z. These results provided a grid file x, y, z, salinity suitable for plotting the actual Bari aquifer salinity by 3D maps. Subsequently, in order to assess effects of pumping on the saltwater freshwater transition zone in the coastal aquifer, the Navier Stokes N S equations were applied to study transient density driven flow and salt mass transport into freshwater of a single fracture. The rate of seawater/freshwater interface advancement given by the N S solution was used to define the progression of saline front in Bari groundwater, starting from the actual salinity 3D map. The impact of pumping of 335 L/s during the transition period of 112.8 days was easily highlighted on 3D salinity maps of Bari aquifer. A new method to study 3D saline front advancement in coastal fractured aquifers has been presented. Field groundwater salinity was measured in boreholes of the Bari Southern Italy coastal aquifer with depth below water table. Then, the Ghyben Herzberg freshwater/saltwater 50% sharp interface and saline front position were determined by model simulations of the freshwater flow in groundwater. Afterward, the best fit procedure between groundwater salinity measurements, at assigned water depth of 1.0 m in boreholes, and distances of each borehole from the modelled freshwater/saltwater saline front was used to convert each position x, y in groundwater to the water salinity concentration at depth of 1.0 m. Moreover, a second best fit procedure was applied to the salinity measurements in boreholes with depth z. These results provided a grid file x, y, z, salinity suitable for plotting the actual Bari aquifer salinity by 3D maps. Subsequently, in order to assess effects of pumping on the saltwater freshwater transition zone in the coastal aquifer, the Navier Stokes N S equations were applied to study transient density driven flow and salt mass transport into freshwater of a single fracture. The rate of seawater/freshwater interface advancement given by the N S solution was used to define the progression of saline front in Bari groundwater, starting from the actual salinity 3D map. The impact of pumping of 335 L/s during the transition period of 112.8 days was easily highlighted on 3D salinity maps of Bari aquifer. 4 Published version 8/1/2016 A New Method to Infer Advancement of Saline Front in Coastal Groundwater Systems by 3D The Case of Bari Southern Italy Fractured Aquifer Metodologia di rappresentazione della salinita di acquiferi costieri in mappe 3D Computation_2016.pdf Articolo in rivista MDPI 2079 3197 Computation Basel Computation Basel PALMIOTTA DOMENICO costantino.masciopinto MASCIOPINTO COSTANTINO TA.P04.005.010 Metodi, dispositivi di stima dei parametri idrogeologici e modelli matematici |
