Validación de tecnologías para el estudio batimétrico de la zona intermareal de Gipuzkoa

Abstract

This project’s goal was to carry out an Airborne

LIDAR Hidrographic (ALH) survey of the intertidal

zone of the Gipuzkoan coast, in order to cover the

supralittoral and infralittoral zones to a depth of at

least 8 m. under the astronomical low water mark.

In turn, it would provide continuity to the existing

bathymetric and altimetric models.

In the coastal strip there were data for the land

area obtained with Terrestrial Airborne Laser

Scanning (ALS), and there was also a bathymetric

survey of the coastal platform carried out through

a MultiBeam Echosounder (MBES). Given the

difficulties of surveying in the coastline, the works

were set so that the ALS survey was carried out

during the low tide and the MBES survey was

done during the high tide, thus reducing the safety

margin under the keel to the minimum.

Both surveys were provided as control elements

for the ALH to study the accuracy and reliability of

ALH data, since they were obtained with verified

technologies with an uncertainty of less than or

equal. Although the first studies were carried out

solely in the water area through the comparison

of the data gathered by ALH and MBES, it soon

became clear that a higher number of clearly

defined elements was necessary. Therefore, the land

study was added to the data collected through ALS

technology.

The ALH technology has proven to be the best

solution for obtaining coastline cartography, in

addition to being the most efficient as well as the

safest.