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首页> 外文期刊>New Zealand Journal of Marine and Freshwater Research >A submersible device for measuring drag forces on aquatic plants and other organisms
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A submersible device for measuring drag forces on aquatic plants and other organisms

机译：一种用于测量对水生植物和其他生物的阻力的潜水装置

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摘要

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 N 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 < 3% for forces > 0.2 N (setup A) or < 4% for forces > 1 N (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.
机译：本文介绍了一种潜水阻力计（SDG）装置，该装置可用于在低（设置A）和高（设置B）负载应用中研究流-生物相互作用的阻力。该设备的设计使得仅测量作用在边界层流中的测试对象上的拉力。 SDG可以测量对大型生物，小龙虾或贻贝等生物的阻力，以及在实验室和野外条件下以各种布置组装的此类生物与沉积物的组合。在0到4 N范围内的实验室校准表明，装置A记录的力低至0.02 N，而装置B通常没有记录高达c的力。 0.15N。阻力测量的相对标准误差在力> 0.2 N（设置A）下为<3％，在力> 1 N（设置B）下为<4％。以刚性圆柱体为例，以天然和人工（塑料）埃塞俄比亚（Egeria densa）为例，展示了SDG如何在流-生物相互作用研究中使用，例如阻力-速度关系，阻力系数评估或大型植物阻力的频谱。

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