Download Studies of Cave Sediments: Physical and Chemical Records of by Rachel F. Bosch, William B. White (auth.), Ira D. Sasowsky, PDF

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By Rachel F. Bosch, William B. White (auth.), Ira D. Sasowsky, John Mylroie (eds.)

John E. Mylroie and Ira D. Sasowsky' Caves occupy incongruous positions in either our tradition and our technology. The oldest documents of modem human tradition are the vibrant cave work from southern France and northerly Spain, that are now and again greater than 30,000 years outdated (Chauvet, et ai, 1996). but, to name somebody a "caveman" is to claim them primitive and ignorant. Caves, being cryptic and mysterious, occupied very important roles in lots of cultures. for instance, Greece, a rustic with plentiful karst, had the oracle at Delphi and Hades the god of loss of life operating from caves. everyone is either attracted to and mortified through caves. Written files ofcave exploration exist from as early as 852 BC (Shaw, 1992). within the decade of the 1920's, which was once wealthy in information occasions, the second one largest tale (as measured through column inches of newsprint) used to be the entrapment of Floyd Collins in Sand Cave, Kentucky, united states. This was once exceeded basically by way of Lindbergh's flight around the Atlantic (Murray and Brucker, 1979).

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J. MAHLER ET AI. -tg/L-yet the solid phase itself is highly contaminated. Because of the tendency of HCs to associate with. particles, suspended sediment is likely to be the vehicle for the vast majority of the transport of HCs . Once the sediment settles out of flow and settles to the floor of the receiving water body, it can represent a threat to the ecological community. , 1997) . , 2000) . A more effective approach to determining the concentration of HCs on suspended sediments is to separate the sediment from the water column and analyze it directly .

Location of the Terrieu Creek study site. percussion-drilling rig and without the use of drilling mud. Well P7 is known to intercept a zone of slight fracturing at 40 to 50 m, whereas well P8 intercepts highly-fractured zones at 10 to 12 and 42 to 45 m; water-level changes in the two wells in response to rainfall closely mirror one another (Botton, 1984). The effective hydraulic conductivity of the zone penetrated by P7 is 10-7 to 10-9 mls and that of P8 is 10-1 to 10-3 mis, as determined by pump test (Drogue, 1974).

Ij Q) c: ~ 4 2 (c) (d) 0 8 10 12 14 16 18 20 8 10 12 14 16 18 20 Time after rainfall onset (hours) Fig ur e 9. Changes in minera logy in response to storms I and 2 as percent by weight of total sediment (a and b) and as concentration in milligrams per liter of sample (c and d). S. , 1999). Peak concentrations of TSS coincide with changes in specific conductance, indicating flushing of surface water through the aquifer (Mahler and Lynch, 1999) and possibly a surface origin for much of the sediment.

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