Abstract
A magnetic anomaly map of an underwater area indicates the places where the distortion of a magnetic field has occurred. Through the interpretation procedures, a hydrographer can easily indicate the places where the ferromagnetic objects are, then calculate the level of each distortion – by the value of total anomaly – and initially, based on their own knowledge, try to classify the sources of distortion. Objects that induce micro anomaly changes (>30 nT) – like industrial infrastructure, such as pipelines and cables; to unintendingly located targets with ferromagnetic characteristics: wrecks (vessels, planes, cars), military mines, UXO, lost anchors and chains. Interpretation of such a map with the attempt to identify the source of magnetic field distortion, requires a specific knowledge as well as experience.In this article the author presents the research results of dimensioning and location of potential ferromagnetic underwater objects based on a magnetic anomaly map. For further consideration an anchor of buoyage system is taken into account. Geolocation of ferromagnetic sources, contours extraction and dimensioning algorithms of ferromagnetic targets have been carried out in Matlab software. The map of magnetic anomaly enhanced with extracted information was developed in ArcGIS. The analysis was carried out for the purpose of the dissertation thesis and the results are used in further research.
Highlights
Magnetic surveying in a water area is a commonly used method for detection of underwater subbottom ferromagnetic objects, such UXO, mines, wreck, pipelines or anchors [1, 2]
The application assumes the implementation of the aforementioned stages, omitting stage 0 – the final product preparation: magnetic anomaly map creation
The filters were selected on the basis of previous tests of their operation on magnetic anomaly map images
Summary
Magnetic surveying in a water area is a commonly used method for detection of underwater subbottom ferromagnetic objects, such UXO (unexploded ordnance), mines, wreck, pipelines or anchors [1, 2]. It is carried out by marine magnetometers – towed equipment [3]. The operator needs to relate the measurements to the magnetic field measured by specialized shore research stations (in Poland this is done by the Hel station) Thanks to this operation it is possible to determine the occurrence of a magnetic anomaly and determine its size. When referring to the value of the magnetic field measured locally to the shore station, the occurrence of a magnetic storm should be considered
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
