![Page 1: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/1.jpg)
Tide Gauge and Satellite Altimetry integration for Storm Surge prediction.
Ole B. Andersen,Y. Cheng , P.L. Svendsen (DTU, Denmark)
X. Deng, M. Steward, N. Idris and Z. Gharineiat (Uni NewCastle, Australia)
![Page 2: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/2.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
2 DTU Space, Technical University of Denmark
Overview Satellite altimetry and Test regions Crital issues: Spatio-temporal sampling vs surge/cyclone Availability and accuracy Accuracy degradation (Coastal and rain). Reliability of surge capturing Importance of residual range corr errors: Ocean tide correction spatio-temporal correlation Merging with tide gauges Hindcast / forecast modelling Conclusions.
![Page 3: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/3.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
3 DTU Space, Technical University of Denmark
Satellite altimetry is well
Esablished for linear
sea level change
![Page 4: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/4.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
4 DTU Space, Technical University of Denmark
Test regions: Surges/Cyclones
= Water level recorders
NE Australia / GBR:
Seasonal cyclones (near seasonal)
Time scales: North Sea: 1 day NE Australia: 2-3 days
North sea:
Few mainly external surges
![Page 5: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/5.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
5 DTU Space, Technical University of Denmark
Current Satellite Sampling:
Satellite Repeat Period
Track spacing
Inclination Coverage
Jason-2 10 days 315 km 66.5°
CryoSat-2 369 days 8 km 92°(+/-88°)
AltiKa 35 days 80 km 98°(+/-82°)
3 ongoing missions Jason-2 Cryosat-2 AltiKa (French-India)* *>10% data affected (not seen). HY-2 (China) Sentinel-3 (SAR) Near Real time data J2+C2: 4-6 hours Accurcy: 4-6 cm
![Page 6: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/6.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
6 DTU Space, Technical University of Denmark
Sea Level and Storm Surges
Critial issues:
√ Spatio-temporal sampling vs surge/cyclone
√ Availability and accuracy
Accuracy degradation (Coastal and rain).
Reliability of surge capturing
Importance of residual range corr errors:
Ocean tide correction
Merging with tide gauges (spatial temporal correlation)
Hindcast / forecast modelling
![Page 7: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/7.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
7 DTU Space, Technical University of Denmark
Heavy Rain + Coastal problems
Retracking: Simple ICE retracker (Jason) is more noisy but does not have outages
![Page 8: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/8.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
8 DTU Space, Technical University of Denmark
Last devastating storm
surge in Britain – 1953
”Data for validation?”
In Situ
Lack of data in North Sea
![Page 9: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/9.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
9 DTU Space, Technical University of Denmark
High Water in Hvide Sande (Denmark)
Simple 2 std. deviation test on ”high water”
![Page 10: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/10.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
10 DTU Space, Technical University of Denmark
Satellite Obs
One versus two satellite (TOPEX/ERS-2)
North Sea: Key to succes is two satellites
![Page 11: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/11.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
11 DTU Space, Technical University of Denmark
Seasonal Cyclones in NE Australia
Cyclone Helen (4 January, 2008) Cyclone Larry (20 March 2006)
![Page 12: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/12.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
12 DTU Space, Technical University of Denmark
Sea Level and Storm Surges
Critial issues:
√ Spatio-temporal sampling vs surge/cyclone
√ Availability and accuracy
√ Accuracy degradation (Coastal and rain).
√ Reliability of surge capturing
Importance of residual range corr errors:
Ocean tide correction
Spatial temporal correlation
Merging with tide gauges
Hindcast / forecast modelling
![Page 13: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/13.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
13 DTU Space, Technical University of Denmark
Combining satellite altimetry and tide gauge information Importance of the de-tiding procedure.
Enhance temporal correlation between
Tide gauge and satellite altimetry.
![Page 14: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/14.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
14 DTU Space, Technical University of Denmark
Spatio-temporal Correlation Non-tidal (surge) Sea Level variation
• TOPEX / JASON (17 years) ERS / ENVISAT (12 years)
GOT4.7 Pointwise Ocean Tide model
![Page 15: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/15.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
15 DTU Space, Technical University of Denmark
Combing Tide gauges and Altimetry
εβββη +++= 1 )()()()( 33221 tsshtsshtsshtJason
Regression Model
Townville
Use major spatial EOF modes from Jason and 6 tide gauge.
![Page 16: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/16.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
16 DTU Space, Technical University of Denmark
Model Prediction.
Cyclone Helen (January, 04, 2008) Cyclone Larry (March 19th, 2006)
Blue=Tide gauge obs
Green=Tide gauge alone
Red=Altimetery + TG
![Page 17: Tide Gauge and Satellite Altimetry integration for Storm](https://reader034.vdocuments.site/reader034/viewer/2022050612/6273dfcd63dce703d700919f/html5/thumbnails/17.jpg)
ESA Living Planet Symposia, Edinburgh, UK, September, 2013
17 DTU Space, Technical University of Denmark
• Satellite altimetry has proven very valuable t – North Sea: Two Sat detection capturing >90% of high water scena – NE Australia: One sat detection captures most cyclone related sur
advance. – Some of these left uncaptured from tide gauges alone. – Analysis in Eastern Australia is still ongoing (ph.d. Project).
• Future: • Jason-2 is very important for surge forecast (however current in safe • Cryosat-2 has non systematic ground track pattern but applicable. • AltiKa has potential. Potential problem with rain is currently under in
seems far less serious as expected (smaller footprint). • Sentinel-3 (2014/2015) + Jason-3 will offer systematic ground track
additional information in the future.
Conclusions