Sea level data for the Iberian Peninsula

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Presentation transcript:

Sea level data for the Iberian Peninsula

Coastal erosion is a real problem in Portugal: sea level changes Coastal erosion is a real problem in Portugal: sea level changes? “Accelerated sea level rise”? Francelos: 31 dec 1998

Tectonic framework: Recent mountains in the periphery of mini Iberian plate

Neogene compression

Earthquakes in iberia

PSMSL in 2002 Portuguese stations

Is sea level rise accelerating? Many people says so. Is it true?

Many PSMSL stations are not updated

Iberia: trends vs. length of series Portuguese coast

Iberia, in short series: great irregularities in the trends

Iberia series >18,6yr Station Trend Iberia>18yrs 1,92 1,63 Atlantic>18yrs 1,89

Cascais: PSMSL data

Sea leval station monitoring facility

Sagres Station: data and graphs (every minute)

DATA AT CASCAIS IS NOT ACTUALIZED

With the data I was able to get one can make this kind of graphs:

Carlos Antunes site (FCUL)

It was used an uplift of 0,5mm/yr

Secular variation of sea level at Cascais

To understand the influence of earth movements: GPS stations

GPS Cascais: vertical velocity

GPS Lagos: vertical velocity

RSL trends (PSMSL)

Vertical velocities vs latitude: and around Iberia

Absolute sea level trends

Conclusions 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

Going back to the beginning: which are the causes of coastal erosion?

The unfortunate “Titanic” case

Any interference on littoral drift has big consequences

Coastal evolution in the last 50 years: northern Portugal Vcoastal

Aveiro lagoon (Centre Portugal) Littoral drift

Sediments retention by dams: Northern Portugal

Conclusions 2: Coastal erosion has very little to do with sea level change (10%?) Anthropic interventions have a lot to do with it RSL: average >18,6 yr: 1,92 Absolute SL rise <1mm/yr Sea level rise as primary factor for coastal erosion Is simply FALSE

Thanks for your attention!