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SUMMARY:Special talk on "Intriguing fluid mechanics in the Manihiki atoll"
DTSTART:20170704T110000
DTEND:20170704T120000
DTSTAMP:20260930T202134Z
UID:1d937c6dccf988b67c18a42d8c70f80abe078eb5556676cbb6bdf1e5
CATEGORIES:Conferences - Seminars
DESCRIPTION:Short biography:\nDr Peter Nielsen’s research record has pla
 ced him firmly as a world leader in the field of coastal sediment transpor
 t. This is shown most simply by the fact that he is the most cited Coastal
  Engineering researcher in Australia\, and within the top handful in the w
 orld. In the year 2008 his 1st authored works were cited 105 times by othe
 r researchers.\nNielsen is the author of the worlds most cited reference b
 ook on coastal sediment transport: Nielsen\, P (1992): Coastal bottom boun
 dary layers and sediment transport. World Scientific\, Singapore\, 324pp.\
 nIn addition\, Nielsen’s work on coastal groundwater dynamics since 1988
 \,  contains some milestone papers\, e g\, Nielsen\, P (1990): Tidal dyna
 mics of the watertable in beaches. Water Resources Research\, Vol 26 No 9\
 , pp 2127-2135. Reprinted in full in Water resources Journal of the United
  Nations Econ & Soc Comm for Asia and the Pacific\, Dec 1990\, pp 35-43. 
  Cited 161 times by other authors by the end of 2011. Other important rese
 arch areas include Coastal Hazards such as wave runup and rip currents\; 
  Wave theory\, particularly long waves including tsunami and storm surges\
 ; The motion of suspended particles and bubbles\,  Fundamentals of turbul
 ent mixing\;  and most recently wind-driven waves.\n\nThe Manihiki atoll 
 has since 1972 been the source of arguably the worlds’ finest pearls.\n\
 nIn response to a letter of concern about declining water quality\, the Co
 astal Group in UQ’s School of Civil Engineering has conducted hydrodynam
 ics and water quality studies in this very remote lagoon since 2004.  Mos
 t recently\, June-July 2016\, where the focus was the formation of toxic (
 H2S-rich)  bottom water\, which poses a threat to the ecosystem in genera
 l\, and in particular to the islands only cash crop: The pearls.\n \nThe 
 talk will cover:\n\n	a general introduction to this very remote and ‘tru
 e South pacific’ atoll\n	our findings about the flushing mechanisms for 
 the lagoon\, which\, surprisingly to most\, is driven by the waves not by 
 the tide.\n	Recent observations of the strong stratification in the 70m de
 ep lagoon\, which currently displays a +1kg/m3  sharp density increase at
  50m depth.\n\nOur current understanding of the mechanisms\, which generat
 e this dense\, toxic and O2-poor bottom layer.\n 
LOCATION:GR A3 32 https://plan.epfl.ch/theme/generalite_thm_plan_public?la
 ng=en&room=GR%20A3%2032&dim_floor=3&dim_lang=en&tree_groups=centres_nevral
 giques%2Cacces%2Cmobilite_reduite%2Censeignement%2Ccommerces_et_servic
STATUS:CONFIRMED
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