An inexpensive, optical (infrared) detector to locate the sediment/water interface in lakes with unconsolidated sediments |
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| Authors: | Peter Myers Claire L Schelske |
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| Institution: | (1) Department of Fisheries and Aquatic Sciences, 7922 NW 71st Street, Gainesville, FL 32653, USA;(2) Department of Fisheries and Aquatic Sciences, 7922 NW 71st Street, Gainesville, FL 32653, USA |
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| Abstract: | Unconsolidated, flocculent sediments that are frequently resuspended by wind action are found in many shallow-water lakes. Collecting sediment/water interface cores in such lakes for paleolimnological study may be problematic because it is difficult to determine the depth to the water/sediment interface. Accurately determining this water depth is necessary to guarantee that a piston corer does not penetrate the sediments prior to the drive and to maximize the core length. A simple instrument constructed with inexpensive, readily available components is described. This infrared floc detector (IFD) is used to sense the increased optical density of unconsolidated sediments as the detector is lowered into a lake. The IFD, in effect, yields a precise as well as an accurate measure of water depth. The depth to the water/sediment interface can be measured with an accuracy of approximately 1 cm, provided surface waters are relatively calm. |
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| Keywords: | coring method Lake Apopka Newmans Lake depth sounding shallow lakes |
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