This paper presents the development of a novel instrument aimed primarily at measuring the local bathymetry in the surf zone. The technique of electrical conductivity was used with a number of sensors placed on a vertical supporting pole. A number of technical difficulties had to be solved before obtaining reliable results. The instrument was tested during field experiments. Then we investigated the possibility of extending the field of application of the instrument to the assessment of soil porosity using Archie's law. Using this law and the cementation factor, defined through laboratory experiments, we processed the data from an in-situ experiment. Changes in porosity within the sediment have been observed. However, these results have to be taken cautiously because of the novelty of the instrument.
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