Abstract

Characterization of coastal erosion is paramount to ensure the integrity of any oil and gas facilities. Geophysical surveys are mandatory to build ground models of these particular areas to understand sediment movements and control the risk for the coastal infrastructures safety.

Based on past experiences, infield acquisitions and interpretations have fundamentally been improved to acquire recurrent high precision Multi Beam Echo Sounder (MBES) data with the objective of 4D interpretation. Using a recently developed algorithm addressing budget error (Naankeu-Wati et al., 2016), measurement uncertainty of bathymetric soundings has been thoroughly evaluated.

Beside the description of innovative acquisition methods, new data interpretation and processing techniques are revealed. For a particular area of interest, the paper shows the essential role of digital geographic tools and particularly Geographical Information Systems (GIS) to interpret 4D hydrographic data. Based on the Bathymetric Position Index (BPI) algorithm, a workflow has been built to automatically map seabed features such as sand waves from time-lapse dataset. Such automatic mapping method affords improving the quality of seabed features comparison through the time by limiting subjectivity of data interpretation.

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