Open Session - SWISS GEOSCIENCE MEETINGs

Figure 3. Measurement setup.
Figure 4. Profile measurements before the crane entered
into the test field.
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Figure 5. Detection of bow wave while driving into the
test field.
Geomorphologic mapping of Lake Lucerne - the potential of
high-resolution bathymetry data
Hilbe Michael*, Anselmetti Flavio S.*, Eilertsen Raymond** & Hansen Louise***
*Eawag, Swiss Federal Institute of Aquatic Science and Technology, CH-8600 Dübendorf; michael.hilbe@eawag.ch
**Geological Survey of Norway (NGU), N-9296 Tromsø
***Geological Survey of Norway (NGU), N-7491 Trondheim
Water bodies are major «blank areas» on the sheets of the Geological Atlas of Switzerland. Geomorphologic and geologic data
for the lake floors included in these maps are sparse and only few published geological maps of Swiss lakes exist (e.g.
Schindler, 1976). These are mainly based on single beam echosounder data, reflection seismic profiles and surface sediment
samples. However, the acquisition and evaluation of large amounts of data covering entire lakes are laborious and may nevertheless
fail to yield a sufficiently high resolution required to detect small-scale features on the lake floor. Recently collected
high-resolution swath bathymetry data for parts of Lake Lucerne now provide a digital terrain model of the lake bottom
with a resolution similar to that of airborne laser scanning on land, allowing an accurate identification of sublacustrine
morphologic features.
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Symposium 12: Data acquisition, Geo-processing, GIS, digital mapping and 3D visualisation