C oastal erosion is a real problem in Portugal sea level changes Accelerated s ea level rise Francelos 31 dec 1998 Tectonic framework Recent mountains in the periphery of mini Iberian plate ID: 799222
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Slide1
Sea level data for the Iberian Peninsula
Slide2Coastal erosion is a real problem in Portugal: sea level changes? “Accelerated
s
ea level rise”?
Francelos: 31
dec
1998
Slide3Tectonic framework: Recent mountains in the periphery of mini Iberian plate
Slide4Neogene compression
Slide5Earthquakes in iberia
Slide6PSMSL in 2002
Portuguese stations
Slide7Is sea level rise accelerating?
Many people says so.
Is it true?
Slide8Many PSMSL stations are not updated
Slide9Iberia: trends vs
. length of series
Portuguese coast
Slide10Iberia, in short series: great irregularities in the trends
Slide11Iberia series >18,6yr
Station
Trend
Iberia>18yrs
1,92
Iberia>60yrs
1,63
Atlantic>18yrs
1,89
Slide12Cascais: PSMSL data
Slide13Sea leval station monitoring facility
Slide14Sagres Station: data and graphs (every minute)
Slide15DATA AT CASCAIS IS NOT ACTUALIZED
Slide16With the data I was able to get one can make this kind of graphs:
Slide17Carlos Antunes site (FCUL)
Slide18It was used an uplift of 0,5mm/
yr
Slide19Secular variation of sea level at Cascais
Slide20To understand the influence of earth movements: GPS stations
Slide21GPS Cascais
: vertical velocity
Slide22GPS Lagos: vertical velocity
Slide23RSL trends (PSMSL)
Slide24Vertical velocities vs latitude: and around Iberia
Slide25Absolute sea level trends
Slide26Conclusions 1:
Most of the places out of Scandinavia are subsiding. This augments RSL trends
The exception: recent mountain ranges in the limits of Iberia (Pyrenees and
Baetics)
The “absolute sea level” changes (discounting on earth movements) are available only for 5 locations in Iberia
4 of them are under 1mm/
yr
of absolute (
eustatic
/steric) sea level rise
Slide27Going back to the beginning: which are the causes of coastal erosion?
Slide28The unfortunate “Titanic” case
Slide29Any interference on littoral drift has big consequences
Littoral drift
Slide30Coastal evolution in the last 50 years: northern Portugal
Vcoastal
Slide31Aveiro lagoon (Centre Portugal)
N
Littoral drift
Slide32Sediments retention by dams: Northern Portugal
Slide33Conclusions 2:
Coastal erosion has very little to do with sea level change (10%?
)
Anthropic interventions have a lot to do with itRSL: average >18,6
yr
: 1,92
A
bsolute SL rise <1mm/
yr
Sea level rise as primary factor for coastal erosion Is simply
FALSE
Slide34Thanks for your attention!