caa a22 4500 445814756 CHVBK 20180317145222.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s10040-011-0763-9 doi (NATIONALLICENCE)springer-10.1007/s10040-011-0763-9 Effect of tidal fluctuations on transient dispersion of simulated contaminant concentrations in coastal aquifers [Elektronische Daten] [Ivana La Licata, Christian Langevin, Alyssa Dausman, Luca Alberti] Effet des fluctuations inter-tidales sur la dispersion transitoire des concentrations simulées d'un contaminant dans les aquifères côtiers Variable-density groundwater models require extensive computational resources, particularly for simulations representing short-term hydrologic variability such as tidal fluctuations. Saltwater-intrusion models usually neglect tidal fluctuations and this may introduce errors in simulated concentrations. The effects of tides on simulated concentrations in a coastal aquifer were assessed. Three analyses are reported: in the first, simulations with and without tides were compared for three different dispersivity values. Tides do not significantly affect the transfer of a hypothetical contaminant into the ocean; however, the concentration difference between tidal and non-tidal simulations could be as much as 15%. In the second analysis, the dispersivity value for the model without tides was increased in a zone near the ocean boundary. By slightly increasing dispersivity in this zone, the maximum concentration difference between the simulations with and without tides was reduced to as low as 7%. In the last analysis, an apparent dispersivity value was calculated for each model cell using the simulated velocity variations from the model with tides. Use of apparent dispersivity values in models with a constant ocean boundary seems to provide a reasonable approach for approximating tidal effects in simulations where explicit representation of tidal fluctuations is not feasible. Springer-Verlag, 2011 Tidal variation nationallicence Solute transport nationallicence SEAWAT nationallicence Coastal aquifers nationallicence Transient dispersion nationallicence La Licata Ivana Dipartimento di Ingegneria Idraulica, Ambientale, Infrastrutture Viarie, Rilevamento, Politecnico di Milano Piazza Leonardo da Vinci 32, 20133, Milan, Italy aut Langevin Christian US Geological Survey, Office of Groundwater, 411, National Center Reston, 20192, Arlington, VA, USA aut Dausman Alyssa U.S. Geological Survey, Florida Integrated Science Center, 3110 SW 9th Avenue, 33315, Fort Lauderdale, FL, USA aut Alberti Luca Dipartimento di Ingegneria Idraulica, Ambientale, Infrastrutture Viarie, Rilevamento, Politecnico di Milano Piazza Leonardo da Vinci 32, 20133, Milan, Italy aut Hydrogeology Journal Springer-Verlag 19/7(2011-11-01), 1313-1322 1431-2174 19:7<1313 2011 19 10040 https://doi.org/10.1007/s10040-011-0763-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-011-0763-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- La Licata Ivana Dipartimento di Ingegneria Idraulica, Ambientale, Infrastrutture Viarie, Rilevamento, Politecnico di Milano Piazza Leonardo da Vinci 32, 20133, Milan, Italy aut NATIONALLICENCE 700 1- Langevin Christian US Geological Survey, Office of Groundwater, 411, National Center Reston, 20192, Arlington, VA, USA aut NATIONALLICENCE 700 1- Dausman Alyssa U.S. Geological Survey, Florida Integrated Science Center, 3110 SW 9th Avenue, 33315, Fort Lauderdale, FL, USA aut NATIONALLICENCE 700 1- Alberti Luca Dipartimento di Ingegneria Idraulica, Ambientale, Infrastrutture Viarie, Rilevamento, Politecnico di Milano Piazza Leonardo da Vinci 32, 20133, Milan, Italy aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/7(2011-11-01), 1313-1322 1431-2174 19:7<1313 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer