Publication Date:
2023-06-16
Description:
Tidal information and knowledge of longer-term sea level change are vital for safety of coastal communities and infrastructure. Madagascar has limited tidal prediction and no national sea-level monitoring capability. Working with Malagasy partners, the Direction Générale de la Météorologie (DGM), PASS-SWIO aims to establish a sea level monitoring system for Madagascar based on deployment of a low-cost relocatable tide gauge (Portagauge). Longer-term sea level variability can be derived from satellite altimetry data, however, for ‘absolute’ sea level measurements to be applied at the coast they require adjustment to local relative sea level, via ‘ground-truthing’ to some known fixed point on land. The GNSS-IR technique allows sea level to be inferred relative to the same geodetic reference frame as satellite altimetry. Co-location of GNSS with conventional tide gauge sensors allows these measurements to be connected to satellite altimetry, which can substitute for long-term observations from tide gauges.Portagauge, which uses GNSS-IR alongside a conventional radar gauge, will be deployed at Toamasina (NE Madagascar). DGM will be trained to operate the Portagauge and to process and analyse tide gauge and satellite altimeter data (Jason-2, Jason-3, Sentinel-3A and 3B). By cross validating portagauge data against satellite data, they will generate analysis of tidal and non-tidal sea-level characteristics for the Madagascar coastal region. The project will define a road map to establish a long-term, sustainable, national sea-level monitoring system for Madagascar. This will provide a model sea level monitoring system for developing island states and coastal nations, based on low-cost tide gauges and satellite data.
Language:
English
Type:
info:eu-repo/semantics/conferenceObject
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