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WK 3 : taping Karst Sub-Marine Springs (KSMS)

WK 3 : taping Karst Sub-Marine Springs (KSMS). Michel BAKALOWICZ Perrine FLEURY, PhD student HydroSciences, CNRS Partner no 2. Results from experiments. The experiments on the spring taping system and on KSMS data measurement and logging point out that :

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WK 3 : taping Karst Sub-Marine Springs (KSMS)

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  1. WK 3: taping Karst Sub-Marine Springs (KSMS) Michel BAKALOWICZ Perrine FLEURY, PhD student HydroSciences, CNRS Partner no 2 MEDITATE Kick off meeting, Montpellier, Michel BAKALOWICZ & Perrine FLEURY

  2. Results from experiments • The experiments on the spring taping system and on KSMS data measurement and logging point out that : • The spring must be isolated from seawater, in order to avoid intrusion into the spring or the taping system. • The hydraulic equilibrium between fresh and sea water must be preserved. MEDITATE Kick off meeting, Montpellier, Michel BAKALOWICZ & Perrine FLEURY

  3. How to tap a KSMS • Isolating the KSMS by covering it with a structure driving the water, pipe or funnel. • The preservation of hydraulic equilibrium is ruled by the 2 following conditions: • Never collect more water than the natural discharge because seawater may be intruding into the taping system (No pumping condition) • Never produce any overpressure at the spring, because freshwater may emerge elsewhere by de-plugging conduits or fractures, creating a new connection with seawater (No de-plugging condition) . MEDITATE Kick off meeting, Montpellier, Michel BAKALOWICZ & Perrine FLEURY

  4. The KSMS instrumentation Taping structure T-C-P probes Electromagnetic flowmeter Pipe #1 Fresh water overflow The KSMS MEDITATE Kick off meeting, Montpellier, Michel BAKALOWICZ & Perrine FLEURY

  5. Principles of a taping system (1) • Isolating the KSMS from seawater and piping fresh water • Fresh water flow driven by density difference in the pipe MEDITATE Kick off meeting, Montpellier, Michel BAKALOWICZ & Perrine FLEURY

  6. Principles of a taping system (2) • Opening of the taping system to the seawater to avoid too important changes of the hydraulic head during floods • Existence of an interface due to different density of fresh and sea water forcing down seawater MEDITATE Kick off meeting, Montpellier, Michel BAKALOWICZ & Perrine FLEURY

  7. The taping system To the surface Taping a part of the total KSMS flow Pipe # 2 F 1 II F 2 = F1 + F3 F 3 IV III Fresh water – seawater interface Low outflow rate to avoid seawater intrusion F 2 I Pipe #1 MEDITATE Kick off meeting, Montpellier, Michel BAKALOWICZ & Perrine FLEURY KSMS

  8. WP 3 planning (1) • Month 12 : defining the appropriate experimental site • Months 13 to 18 : • Definition of the characteristics of the instrumentation taping system (shape, dimensions, structure, anchoring, materials …) • Building of the structure • Selection of the appropriate probes and data logger • Waterproofing of the equipment MEDITATE Kick off meeting, Montpellier, Michel BAKALOWICZ & Perrine FLEURY

  9. WP 3 planning (2) • Month 18 : Setting of the instrumentation taping • Months 18 to 30 : KSMS monitoring, complementary investigations on the recharge area MEDITATE Kick off meeting, Montpellier, Michel BAKALOWICZ & Perrine FLEURY

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