Ongoing
Tom Morgan, IDEA
A lake bottom soil type study was initiated three years ago using acoustic backscatter data originally acquired by IBM for high resolution bathymetry. The intensity of the backscatter was calibrated to soil type (mud, clay, sand, gravel) using grab samples to produce a map of the bottom sediment type. This is currently being followed-up using green, airborne LiDAR data acquired for shallow water bathymetry. Calibration of this data set to bottom samples is planned for next summer. Sub-soil mapping is also underway using sub-bottom acoustic reflection data acquire by the USGS.