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A submersible device for measuring drag forces on aquatic plants and other organisms

Abstract : This paper describes a device, the submersible drag gauge (SDG), that can be used for drag measurements in studies of flow-biota interactions at low (setup A) and high (setup B) load applications. The device is designed so that solely drag forces acting on a test object in a boundary layer flow are measured. The SDG can measure drag on organism(s), such as macrophtyes, crayfish or mussels, as well as a combination of such organisms and sediments assembled in a variety of arrangements in both laboratory and field conditions. Laboratory calibrations over the range of 0 to 4 showed that setup A registered forces as low as 0.02 N, whereas setup B often did not register forces up to c. 0.15 N. The relative standard error of drag measurements was 0.2 (setup A) or 1 (setup B). Using a rigid cylinder, and natural and artificial (plastic) Egeria densa as examples, showed how the SDG can serve in studies of flow-biota interactions such as drag-velocity relations, assessments of drag coefficients, or the frequency spectrum of macrophyte drag.
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Submitted on : Friday, May 15, 2020 - 2:01:43 PM
Last modification on : Friday, March 5, 2021 - 3:29:26 AM


  • HAL Id : hal-02590160, version 1
  • IRSTEA : PUB00023522



F. Callaghan, G. Cooper, V. Nikora, N. Lamouroux, B. Statzner, et al.. A submersible device for measuring drag forces on aquatic plants and other organisms. New Zealand Journal of Marine and Freshwater Research, Royal Society of New Zealand, 2007, 41, pp.119-127. ⟨hal-02590160⟩



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