Lawrence B. Conyers and Sarah Lowry
GPR on a High Mountain Lake, Colorado, USA
Many GPR reflection profiles were collected using a canoe on a freshwater lake in the Rocky Mountains. Excellent radar wave penetration was measured, using both 270 and 400 MHz antennas. Reflection traces were placed into space using GPS and individual profiles were interpreted, with the lake bottom and other reflections digitized for three-dimensional mapping. It…
3 responses to “GPR on a High Mountain Lake, Colorado, USA”
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This is a short article that I had been meaning to get out there for almost 18 years. Sarah Lowry, co-author here, was an undergraduate student of mine at the time (later my graduate student), who was a GIS expert already at 20 years old, and was able to place all the GPR profiles into space. She also helped in the lake coring too, as I recall. I was prompted to get this done when I had a few messages from others in our group who were considering GPR on water. Sam Roberts in the UK then wrote me saying that he had also recently collected data on a lake, and found some very interesting submerged burned wooden features. He will submit those results to our site later, when he gets done with some really borning utility mapping projects he is working on. Brandon Ackermann will soon publish more GPR on water with his canoe project on lakes and rivers in Florida. This reminds me to dig out my crannog project from Ireland and put it up here. More really great GPR data on water.
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As a novice GPR enthusiast, this article is great for understanding the concept of GPR and what it can provide to the user, given the right water conditions. I found it much easier to interpret, compared to other data showing terrestrial GPR scans.
Quick question – Is the unit of measure for the lake water depths (Figure 9) shown in centimeters? More out of personal curiosity, the figure/map still makes sense without knowing.
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Great exposure to someone’s practical experience. Also a fun read–I loved the waterski ropes. I particularly liked the precision of figure 11 showing results of a in-lab experiment of using GPR in varying levels of salinity–something I’ll always keep in the back of my mind.
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