1 / 31

Impacts of cyclones over the Argentinean coast

Impacts of cyclones over the Argentinean coast. Claudia M. Campetella Departamento de Ciencias de la Atmósfera y los Océanos Universidad de Buenos Aires Argentina. Impacts of cyclones over the Argentinean coast. Impact of coastal cyclones. Natural disasters:

teneil
Download Presentation

Impacts of cyclones over the Argentinean coast

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Impacts of cyclones over the Argentinean coast Claudia M. Campetella Departamento de Ciencias de la Atmósfera y los Océanos Universidad de Buenos Aires Argentina

  2. Impacts of cyclones over the Argentinean coast Impact of coastal cyclones • Natural disasters: • Floods (positive storm surges) • Very intense winds • Negative storm surges • Affects the economy and industries • Fishing industry • Oil platforms • Coastal management

  3. Explosive cyclones over the South Atlantic Ocean

  4. Explosive cyclones Possia, PhD Dissertation Sanders y Gyakum (1980) 00 UTC 12 UTC Period: 1979 – 1993 Data: ECMWF Reanalysis, 1.25ºx1.25º resol. • 200 cases • 97% over ocean

  5. Explosive cyclones Possia, PhD Dissertation • seasonal meridional displacement • More frequent in the cold season • June to September :longer explosive development

  6. Explosive cyclones Possia, PhD Dissertation Greatest explosive development Black lines: initiation of explosive development Color lines: inititation time + 24 hs 460 gpm – 59.6 hPa in 24 hs 449 gpm – 56 hPa in 24 hs

  7. Explosive cyclones Possia, PhD Dissertation Longest explosive development More than 36 hs of explosive development Black lines: initiation of explosive development Color lines: inititation time + 24 hs

  8. Explosive cyclones Possia, PhD Dissertation The extreme cases of explosive cyclones as greatest explosive and longest development occur close the Argentinean coast. They produce different impacts over the coastline and offshore. It depends of the position of the cyclone center and its track

  9. Negative storm surges in the Port of Buenos Aires

  10. Negative storm surges Campetella et al, 2007, JOC • Negative Storm surges in the Port of Buenos Aires affects • navigation • Drinking water supply of Buenos Aires city (around 6 millions people)

  11. Negative storm surges Campetella et al, 2007, JOC Period: 1953 – 2003 Storm surges: oberverd hourly levels – corresponding astronomical tide level

  12. Negative storm surges Campetella et al, 2007, JOC -1.20 m end initiation Astronomical tide Observed tide Storm surge Storm surges: oberverd hourly levels – corresponding astronomical tide level 232 cases of NSS lower than -1,20 m 35 cases of NSS lower than -1.80 m

  13. Negative storm surges Campetella et al, 2007, JOC All cases NSS < -1.80 m • The thresholds selected are related to the following risk levels: • -1.20 m is the alert level at RDP drinking water inlets; • which close partially or totally at -1.50 m and -1.80 m, respectively

  14. Negative storm surges Campetella et al, 2007, JOC end initiation Extreme negative storm surges Maximum depth Initiation 1000 hPa mean field and anomaly (35 cases) NCEP reanalysis

  15. Negative storm surges, extreme cases

  16. Negative storm surges Extreme negative storm surge cases reveal a well defined pattern: • A low pressure system over the east of Buenos Aires province • The associated winds direction facilities the outflow from the estuary The type of storm surge (negative or positive) strongly depends on the cyclone location. If the cyclone is placed to the north, it causes a river level rise (“Sudestada”). It’s essential a good forecast of the cyclone track and intensity

  17. Cyclones and extreme waves near the coast

  18. Cyclones and extreme waves Campos et al, 2007 – Martin et al, 2007 Servicio de Hidrografía Naval (SHN) • Knowledge of waves is important for • industries (fishing, oil –platforms-, . . . .) • management of coasts • natural disasters (decision makers)

  19. Cyclones and extreme waves Campos et al, 2007 – Martin et al, 2007 Servicio de Hidrografía Naval (SHN) • SE winds are more efficient for the formation of extreme waves en the RDP region • SWAN model (Simulating WAve Nearshore) is used to simulate waves in the RDP region.

  20. Cyclones and extreme waves Campos et al, 2007 – Martin et al, 2007 Servicio de Hidrografía Naval (SHN) • Low resolution grid: 100 x 70 points – 0.2501º x 0.1779º (22.7 km x 20.0 km) • High resolution grid: 138 x 90 points - 0.0298º x 0.0298º ( 6.0 km x 6.0 km)

  21. Cyclones and extreme waves Campos et al, 2007 – Martin et al, 2007 Servicio de Hidrografía Naval (SHN) Data: Wind at 10 m (NCEP) Batimetria

  22. Cyclones and extreme waves Campos et al, 2007 – Martin et al, 2007 Servicio de Hidrografía Naval (SHN) Wave height and wind 6 de abril (8:00 UTC) Extreme event: april 1994 Geopotential height 6 de abril (12:00 UTC)

  23. Cyclones and extreme waves Campos et al, 2007 – Martin et al, 2007 Servicio de Hidrografía Naval (SHN) Extreme event: april 1994 Wave height and wind Geopotential height 7 de abril (17:00 UTC) 7 de abril (12:00 UTC)

  24. Cyclones and extreme waves Campos et al, 2007 – Martin et al, 2007 Servicio de Hidrografía Naval (SHN) 5,46 m, Punta del Este 7 de abril – 01 UTC

  25. Cyclones and extreme waves Campos et al, 2007 – Martin et al, 2007 Servicio de Hidrografía Naval (SHN) Extreme event: May 2000 16 may 1200 UTC 16 may 1500 UTC Geopotential Height Wind and wave height (m)

  26. Cyclones and extreme waves Campos et al, 2007 – Martin et al, 2007 Servicio de Hidrografía Naval (SHN) Extreme event: May 2000 17 may 1200 UTC 17 may 1500 UTC Geopotential Height Wind and wave height (m) Maximum wave height: 8 m

  27. Cyclones and extreme waves Campos et al, 2007 – Martin et al, 2007 Servicio de Hidrografía Naval (SHN) 18 may 1500 UTC

  28. Cyclones and extreme waves Campos et al, 2007 – Martin et al, 2007 Servicio de Hidrografía Naval (SHN) 6.31 m, Punta del Este 17 de mayo 21:00 UTC

  29. Cyclones and extreme waves Possia et at, 2003, Met. Appl. • 17 May 2000 • The RDP level reached a maximum of 3.52 m. • 2.50 m is the flood warning level. • Strong “Sudestada”

  30. Summary Explosive cyclones are frequent in SW south Atlantic Ocean Explosive or not, they affect the activities over this region Most of the cyclones that reach its maximum development over SW South Atlantic, begin over SE Brasil, Uruguay or NE Argentina. It´s very important that NWP models may capture this previous stage Lim y Simmonds, 2002, MWR

  31. Summary It´s very important that NWP models may capture this previous stage Improve its position, track an intenstiy THE END

More Related