Measuring erosion in gypsum coastline of Sardinia (Abstract/Poster in atti di convegno)

Type
Label
  • Measuring erosion in gypsum coastline of Sardinia (Abstract/Poster in atti di convegno) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Alternative label
  • Laura Sanna, Angelo Arca (2014)
    Measuring erosion in gypsum coastline of Sardinia
    in Fifth International Symposium "Monitoring of Mediterranean coastal areas: problems and measurement techniques", Livorno, June 17-19, 2014
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Laura Sanna, Angelo Arca (literal)
Pagina inizio
  • 186 (literal)
Pagina fine
  • 186 (literal)
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  • Book of Abstracts of the Fifth International Symposium \"Monitoring of Mediterranean coastal areas: problems and measurement techniques\" (literal)
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  • 1 (literal)
Note
  • Abstract (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Institute for Biometeorology, National Research Council - CNR-IBIMET, Sassari, Italy (literal)
Titolo
  • Measuring erosion in gypsum coastline of Sardinia (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#curatoriVolume
  • Fabrizio Benincasa (literal)
Abstract
  • The present work is aimed to deal with the study of short-term gypsum micro-erosion (MEM method) started in July 2013 along Ghisciera Mala coastal cliff (Alghero, NW Sardinia), the unique gypsum karst area of Sardinia. Here Keuper evaporites (Mesozoic in age) crop out for a thickness of at least 100 metres, showing particular karst surface landforms that offer a natural laboratory to improve the knowledge of the denudation on high soluble lithotypes. In this area, two micro-erosion meter stations have been placed at different environmental conditions along the 50 m high gypsum cliff. One of the MEM stations is located on dipping homogeneous gypsum bedrock at around 4 metres above sea level and exposed to rainfall and runoff. The second one is sited closely to the previous one, on the same sedimentary facies, in an overhanging rock wall at 2 metres above sea level. The one-year monitoring data show an erosion rate different for the two settings with a negligible value for the MEM station on the oblique bedrock and with a lowering rate of -0.51 mm a-1 on the vertical coast. The mean gypsum degradation value calculated in this last point is -0.93 mm mm-1 10-3 for an amount of 1000 mm rainfall. Excluding the low values recorded on the slopping surface that seem to have been affected by flood events, the erosion rate obtained for the MEM station on the very steep side is in complete agreement with those reported in other Mediterranean area. (literal)
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