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Article

Spanish

ID: <

oai:doaj.org/article:c8e080720b8343aa9e6e06ae4e866c72

>

·

DOI: <

10.26640/22159045.438

>

Where these data come from
Construction of the vertical reference hydrographic area for Buenaventura and Malaga bays, Colombian Pacific

Abstract

This article defines the methodological route used in the project ‘Vertical Reference Hydrographic Network for the main Colombian seaports’, during the generation of the vertical reference framework called ‘Vertical Reference Hydrographic Area (SHRV2016)’ for the bays of Buenaventura and Málaga in the Colombian Pacific, based on three main components: the mathematical determination of vertical datums associated with historical water level records, the establishment of a network of first order geodetic vertices, and the measurement of sea surface heights with reference to the WGS84 (World Geodetic System) ellipsoid, using Global Navigation Satellite System (GNSS) receivers in RTK (Real Time kinematic) differential mode. The land-based reference points were used to give vertical precision control towards datums in water, and in turn for the installation of GNSS base receivers responsible for sending differential corrections in real time during sea surface height measurement; These measurements, together with the densification of vertical datums calculated for the area, formed the basis for the production of the SHRV2016, a model which, with a spatial resolution of 500 metres, refers to the WGS84 ellipsoid the vertical datums at water level, and which, in addition to standardising the measurements made by different users in the waters under the jurisdiction of a vertical datum; it makes it possible to exploit the advantages of GNSS technology in order to measure and correct water levels in real time with the lowest possible degree of uncertainty during hydrographic surveys, optimising time, quality and resources, especially in places such as the Bay of Buenaventura and Malaga, where the tidal regime makes correction activity complex due to the variability in range and stage specific to the sector, which makes it necessary to install multiple tidal stations, perform topography and geodesy tasks in places that are difficult to access, and wait for the end of the hydrographic survey to include station records in the final correction of depths. In the medium term, VHS shall allow the generation of a complete reference model of tidal datums towards ellipsoid, covering completely the country’s coastal and island regions, up to the territorial sea boundaries, thanks to the combination of satellite altimetry data and offshore observation tools such as GPS buoys, which allow for proper fusion with locally generated models in each bay and port.

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