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Titolo:
Factors controlling the configuration of the fresh-saline water interface in the Dead Sea coastal aquifers: synthesis of TDEM surveys and numerical groundwater modeling
Autore:
Yechieli, Y; Kafri, U; Goldman, M; Voss, CI;
Indirizzi:
Geol Survey Israel, IL-95501 Jerusalem, Israel Geol Survey Israel Jerusalem Israel IL-95501 IL-95501 Jerusalem, Israel Geophy Inst Israel, IL-71100 Lod, Israel Geophy Inst Israel Lod Israel IL-71100 Inst Israel, IL-71100 Lod, Israel US Geol Survey, Reston, VA 22092 USA US Geol Survey Reston VA USA 22092US Geol Survey, Reston, VA 22092 USA
Titolo Testata:
HYDROGEOLOGY JOURNAL
fascicolo: 4, volume: 9, anno: 2001,
pagine: 367 - 377
SICI:
1431-2174(200108)9:4<367:FCTCOT>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
LAKE LISAN; RIFT;
Keywords:
salt-water/fresh-water relations; time domain electromagnetic (TDEM); Dead Sea brine; hydrological modeling; flushing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Yechieli, Y Geol Survey Israel, 30 Malkhei Israel St, IL-95501 Jerusalem, Israel Geol Survey Israel 30 Malkhei Israel St Jerusalem Israel IL-95501
Citazione:
Y. Yechieli et al., "Factors controlling the configuration of the fresh-saline water interface in the Dead Sea coastal aquifers: synthesis of TDEM surveys and numerical groundwater modeling", HYDROGEOL J, 9(4), 2001, pp. 367-377

Abstract

TDEM (time domain electromagnetic) traverses in the Dead Sea (DS) coastal aquifer help to delineate the configuration of the interrelated fresh-waterand brine bodies and the interface in between. A good linear correlation exists between the logarithm of TDEM resistivity and the chloride concentration of groundwater, mostly in the higher salinity range, close to that of the DS brine. In this range, salinity is the most important factor controlling resistivity. The configuration of the fresh-saline water interface is dictated by the hydraulic gradient, which is controlled by a number of hydrological factors. Three types of irregularities in the configuration of fresh-water and saline-water bodies were observed in the study area:1. Fresh-water aquifers underlying more saline ones ("Reversal") in a multi-aquifer system.2. "Reversal" and irregular residual saline-water bodies related to historical, frequently fluctuating DS base level and respective interfaces, whichhave not undergone complete flushing. A rough estimate of flushing rates may be obtained based on knowledge of the above fluctuations. The occurrenceof salt beds is also a factor affecting the interface configuration.3. The interface steepens towards and adjacent to the DS Rift fault zone. Simulation analysis with a numerical, variable-density flow model, using the US Geological Survey's SUTRA code, indicates that interface steepening may result from a steep water-level gradient across the zone, possibly due toa low hydraulic conductivity in the immediate vicinity of the fault.

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Documento generato il 31/03/20 alle ore 15:47:30