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CSLR-Phil Project

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Coastal Sea Level Rise - Philippines Project

The Coastal Sea Level Rise Philippines Project (CLSR-Phil) is a DOST-funded project by UP TCAGP and NAMRIA that aims to determine the rates of relative sea level changes at the coasts using in situ measurements (tide gauge) and space based measurements from satellite altimetry. The project also investigates the contribution of vertical land motion to sea level rise using PSInSAR and GNSS techniques. It also presents the influence to sea level rise/fall of El Nino and Bifurcation of the North Equatorial Current. Low cost GNSS tide gauge float and buoy was developed and deployed for sea level monitoring.

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Events and Announcements

ZOOM WEBINAR

Date posted: May 21, 2021

This poster uses a photo by Wolfgang Hasselmann from unsplash.com.

"Rise or Fall? How Local Factors Influence Coastal Sea Levels"

The Coastal Sea Level Rise - Philippines Project

invites you to

"Rise or Fall? How Local Factors Influence Coastal Sea Levels"

Happening this June 7, 2021, Monday at 9:30 AM via Zoom.

"Rise or Fall? How Local Factors Influence Coastal Sea Levels" is a webinar about the results of the CSLR-Phil Project and a discussion of its implications for future coastal management and disaster mitigation brought by rising sea level.

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Our Workflow

CONCEPTUAL FRAMEWORK

The estimates of sea level rise (SLR) will be uniquely determined as the project will focus on site specific situations as opposed to treating SLR as a mere consequence of climate change. Three important datasets are considered for this research: (1) Tide Gauge data; (2) Satellite Altimetry data; and (3) Global Navigation Satellite System observed data. The conceptual framework of the project is summarized in the figure below, which also explains the adopted logo of the project.

CSLR-Phil Project conceptual framework.

GENERAL WORKFLOW

This study used an integrated approach in determining the rate of relative sea level change around the Philippines by using tide gauge measurements of the National Mapping and Resource Information Authority (NAMRIA) complemented by the different satellite altimeter missions such as EnviSat, Jason-1, Jason-2, Jason-3, SARAL, Sentinel-3A, and Sentinel-3B. Both the tide gauge and satellite altimeter measurements were referenced to the WGS84 ellipsoid. A schematic representation of the methods employed in this study is illustrated below.

General workflow of the study

DATASETS

Tide Gauge (TG) data

Tide gauges measure the variations of sea level relative to a geodetic benchmark. Tide gauges can provide sea level measurements on an hourly basis but despite the high-resolution data it provides, it also has disadvantages.

Satellite Altimetry (SA) data

The radar altimetry sensor measures the distance between the satellite and the surface below. That distance is called the range which can be determined through the echoes of the radar pulses that bounce from the surface. The absolute elevation of the surface below can be derived using the difference between the altitude of the orbit and the range, including the corrections for atmospheric propagation and reflection on the surface.

Global Navigation Satellite System (GNSS) observed data

GNSS refers to a constellation of satellites that provides signals from space and transmit positioning and timing data to a user’s receiver anywhere on Earth which in turn precisely determines precise geographic location. GNSS can also be used for determining vertical land movement (VLM) at tide gauge stations.