(in lingua inglese)
We developed and tested a non-destructive 3D acoustic coring system under the water bottom. A field test was conducted in a pond and the system worked without any problems arising. The measurement system can gather information under the water bottom and reconstruct the spatial status. The present study confirmed that the natural lotus root (diameter of 0.020–0.025 m) can be detected using the acoustic coring method. The measurement system is a versatile tool for the detection of lotus, the spread of which is an environmental problem in eutrophied lakes.