Abstract
In the course of a site survey for an offshore windfarm area within the German Bight, data from 30 locations up to 80 m below seabed was acquired consisting of sampling boreholes, geophysical borehole logs (BGL) and cone penetration tests (CPT). Since there are no investigations of comparable scale for the German Bight so far, the comprehensive data set offers the possibility of a correlation analysis between CPT results and in-situ measurements of shear wave velocity (Vs ). The evaluation shows a moderate to good match with existing correlation equations and reveals differences in quality between the conducted Vs measurement methods. Various regression analyses indicate that, in the case of the investigated data, an exponential model with two regression parameters performs only slightly better than a simple linear model with one regression parameter. Considering these observations, two equations are proposed for estimating Vs on a site- and soil type-specific basis.
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