Geophysical methods are a very important and useful tool for investigations on water covered areas, when we are planning to built<br>bridges, dams and harbours and also to study navigation routes. The traditional investigation methods, like drilling, bottom sample<br>collecting, use to find out important data, but may not give density of data enough to construct maps on scale desirable for<br>engineering purposes. Continuous Seismic Profiling and Sonographic are the most important shallow geophysical methods applied<br>for lakes, rivers and nearshore investigation. In this article we show some examples of projects, developed by IPT (Instituto de<br>Pesquisas Tecnológicas do Estado de São Paulo) on route navigation studies.


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