Please login first

  • Open Access
  • 5 Reads
  • 10 Views
  • 0 Citations
  • 0 Recommendations

ASSESSMENT OF LARGE-SCALE CIRCULATION AND SOCIETAL IMPACTS OF THE HYDRO-GEOMORPHOLOGIC EVENT OCCURRED IN PORTUGAL, FEBRUARY 1979
Luis Rebelo 1 , Alexandre Ramos 1 , Susana Pereira 2 , Ricardo Trigo 1

1  Instituto Dom Luiz, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa
2  Centro de Estudos Geográficos, Instituto de Geografia e Ordenamento do Território, Universidade de Lisboa, Lisboa, Portugal

Published: 05 November 2017 by MDPI AG in First International Electronic Conference on the Hydrological Cycle in First International Electronic Conference on the Hydrological Cycle
MDPI AG, 10.3390/CHyCle-2017-04833
Abstract:

Western Iberia is frequently struck by intense mid-latitude cyclones coming from the North Atlantic basin and often impinging extreme weather over large swaths of the Iberian Peninsula (IP). The spatial distribution and characterization of past floods and landslides with important social consequences in Portugal for the period 1865-2015 was performed within the context of the DISASTER project (Zezere et al., 2014). From this database, a major hydro-geomorphologic event was selected, the February 1979, in order to study its atmospheric forcings and to analyze its societal impacts.

The February 1979 event is a top ranked event in the DISASTER database regarding the total number of affected (18578), displaced (14322) and evacuated (4244) people in Portugal and in the Tagus basin (7677, 4816 and 2834, respectively).

Most of the days considered in this event produced daily precipitation values over or within the 90th-95th percentile of the corresponding long term daily precipitation series (available at high resolution between 1950 and 2008). Most of the event precipitation occurred in days characterized by wet Circulation Weather Types, i.e. cyclonic (C), west (W) or southwest (SW) types, which agrees with the assessment of wet days obtained by Trigo and DaCamara (2000) and Ramos et al. (2014) for the IP domain.

Also, throughout this period, the North Atlantic Ocean is crossed several times by narrow and prolonged bands of high moisture concentration, with cores above 9 g/kg, that originate near the Caribbean islands and move towards extratropical latitudes by the influence of southwestern low-level jets of medium or high intensity. These are mostly persistent Atmospheric Rivers (ARs) reaching the western IP coast and affecting most of the month of February until the 16th.

Overall, regarding the large-scale circulation, a deep low-pressure system located over the North Atlantic and reaching western IP, allowed for the frequent passage of frontal systems over the territory which was responsible for this precipitation event. In addition, local convective instabilities and strong moisture transport from the Tropical Atlantic produced an extremely intense 15-day precipitation event over western IP, that establishes as the meteorological trigger of the February 1979 Disaster event.

 

Acknowledgements: This work was financed by national funds through FCT - Portuguese Foundation for Science and Technology, I.P., under the framework of the project FORLAND Hydro-geomorphologic risk in Portugal: driving forces and application for land use planning (PTDC/ATPGEO/1660/2014). A. M. Ramos was also supported by a FCT postdoctoral grant (FCT/DFRH/ SFRH/BPD/84328/2012).


Comments on this paper Get comment updates
wiatmppgryar wiatmppgryar
Five Fun Facts About the Philadelphia Eagles
The Philadelphia Eagles are one of the oldest franchises in the entire National Football League. Over the years, there have been some great players that have played for the team too. The Eagles as a team have played in a number of great, even important, games over the years. Here is a look at five things you may not know about the Philadelphia Eagles.

1. The Philadelphia Eagles joined the nfl jerseys as an expansion team in 1931, replacing the Frankford Yellow Jackets which had gone bankrupt. The team's name was inspired by the eagle insignia of President Franklin Delano Roosevelt's National Recovery Act.

2. The first touchdown pass that quarterback Donovan McNabb ever threw in the NFL was thrown to Chad Lewis and came in the fourth quarter of a 44-17 loss to the Indianapolis Colts in the 11th game of the 1999 season.

3. No mack hollins jersey player has gone to more Pro Bowls than linebacker Chuck Bednarik went to eight during his career (1950-54, 1956-57, and 1960). Tied for second on the list at seven Pro Bowls apiece are defensive back Brian Dawkins and defensive lineman Reggie White.

4. The college that the nelson agholor jersey have drafted the most players out of over the course of their existence in the NFL is Notre Dame. Twenty-eight players have come from Notre Dame over the years. Three colleges are tied for second on the list with 21 players each being selected in the draft by Philadelphia: Penn State, Texas, and USC.

5. The Philadelphia Eagles Jerseys have had some great running backs over the years, brian dawkins jersey but one of the team's best runners was quarterback Randall Cunningham who played for the team from 1985 to 1995. On the team's career rushing yards list, Cunningham ranks 5th behind Duce Staley, Steve Van Buren, Brian Westbrook, legarrette blount jersey and Wilbert Montgomery. Some of the many players that Cunningham ranks in front of on the team's career rushing yards list include Ricky Watters, Timmy Brown, Keith Byars, Charlie Garner, rodney mcleod jersey Herschel Walker, Anthony Toney, Correll Buckhalter, Heath Sherman, and Swede Hanson.

The Philadelphia Eagles have a prd a proud oud fan base istory inthe jaylen watkins jersey. After so many years as one of the more important teams in the league, it is safe to say that they will continue to be both a favorite and influential team in the future too.






 
 
Top