Field calibration and performance of sediment traps in a eutrophic holomictic lake |
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| Authors: | R J Flower |
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| Institution: | (1) Palaeoecology Research Unit, Department of Geography, University College, 26 Bedford Way, WC1H OAP London, UK |
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| Abstract: | In wind-stressed and unstratified Lough Neagh low aspect ratio sediment traps, which allow for internal resuspension, collected sediment at a rate close to the natural sediment accumulation rate inferred from dated sediment cores. High aspect ratio traps grossly overestimated the natural rate of sediment accumulation as did, but to a lesser extent, burial rate measurements on an artificial stratigraphic marker. The former type of trap deployed over long exposure periods is therefore recommended as providing the best estimate of net downward particle flux in lakes such as Lough Neagh. However, it is emphasized that all sediment trap types, when operated in shallow turbulent lakes, will to a greater or lesser extent be  contaminated by secondary or redeposited material and so will not provide a direct measure of primary sedimentation. Use of tube traps in lakes such as Lough Neagh should not, however, be discounted since they can provide a record of the quality of sedimenting material through time. |
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| Keywords: | sediment traps aspect ratio resuspension lake sediment accumulation rate diatoms |
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