Drag reduction in wave‐swept macroalgae: Alternative strategies and new predictions

American Journal of Botany - Tập 99 Số 5 - Trang 806-815 - 2012
Patrick T. Martone1, Laurie Kost2, Michael L. Boller3
1Department of Botany and Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia, V6T 1Z4, Canada
2Hopkins Marine Station of Stanford University, Pacific Grove, California 93950 USA
3St. John Fisher College, Rochester, New York 14618 USA

Tóm tắt

• Premise of the study: Intertidal macroalgae must resist extreme hydrodynamic forces imposed by crashing waves. How does frond flexibility mitigate drag, and how does flexibility affect predictions of drag and dislodgement in the field?• Methods: We characterized flexible reconfiguration of six seaweed species in a recirculating water flume, documenting both shape change and area reduction as fronds reorient. We then used a high‐speed gravity‐accelerated water flume to test our ability to predict drag under waves based on extrapolations of drag recorded at slower speeds. We compared dislodgement forces to drag forces predicted from slow‐ and high‐speed data to generate new predictions of survivorship and maximum sustainable frond size along wave‐swept shores.• Key results: Bladed algae were generally “shape changers”, limiting drag by reducing drag coefficients, whereas the branched alga Calliarthron was an “area reducer”, limiting drag by reducing projected area in flow. Drag predictions often underestimated actual drag measurements at high speeds, suggesting that slow‐speed data may not reflect the performance of flexible seaweeds under breaking waves. Several seaweeds were predicted to dislodge at similar combinations of velocity and frond size, suggesting common scaling factors of dislodgement strength and drag.• Conclusions: Changing shape and reducing projected area in flow are two distinct strategies employed by flexible seaweeds to resist drag. Flexible reconfiguration contributes to the uncertainty of drag extrapolation, and researchers should use caution when predicting drag and dislodgement of seaweeds in the field.

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American Journal of Botany

Tập 99 Số 5

806-815

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