Here - Meta Marketing e Eventos

22 nd Salt Water Intrusion Meeting: Salt Water Intrusion in Aquifers: Challenges and Perspectives45 mmThe area under investigation is situated north of Bremerhaven, Northern Germany, and thechosen cross-section is positioned almost perpendicular to the coastline and is approximately12 km long. The subsurface domain is discretized by horizontal prisms, and the surfacedomain is discretized by 2D faces. Parameter values are chosen from previous work for theinvestigated site. A time-variable head representing tidal activity and a constant saltwaterconcentration are prescribed to the left sea side boundary. A time-variable head is prescribedto the left edge nodes of the surface domain, and constant concentration is prescribed to thosesurface domain nodes that are submerged by seawater. Average sea level of 0.045 m.a.s.l iscalculated based on a serial of tide records. Initial conditions are obtained by running thesimulation with the sea level of 0.045 m.a.s.l to reach steady-state.3.2 TideA period of 20 days is simulated. Results show that the tide fluctuation leads to the formationof an extra salt plume beneath the upper part of the intertidal zone (Fig.1). Results of theexchange fluid flux between the surface domain and the subsurface domain through the beachshow that the maximum exchange rates occur around the low tide and high tide coastlines.Exchange rates in the intertidal zone are relatively irregular, such that the flow-in and flowoutprocesses occur alternately along the land surface. The inflow induced by the high tideexplains the formation of the extra plume. We also performed individual analyses for the fourtide states: rising, high tide, dropping and low tide. The results also show that the exchangerates on the re-exposed part of the beach are irregular. It is also confirmed that the rising tideperiod significantly contributes to the development of the plume (Fig.1).Fig. 1 TDS concentration distribution and flow paths. The extra plume is shown in the dashedcircle.3.3 Storm surgeOne single storm surge pulse is generated in the numerical model, in which the maximumovertopping flow-in rate is limited to be less than 200 l s -1 m -1 (EurOtop (2007)) by adjusting186