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Abstract
Sargassum horneri (Turner) C. Agardh is used to restore, create, and recreate seaweed beds along the coastlines of East Asia. Drag produced by waves is a bulk force that can detach thalli from substrata during the early growth stages from substrata. In this study we measured drag forces on small S. horneri thalli (10–40cm long). Unidirectional steady flow was controlled from 20 to 130cms−1 in increments of 10cms−1 in a recirculating water tank. Drag force on individuals ranged from ∼0.3N to ∼3N. Drag (Fdrag) and water velocity (U) produced the following exponential empirical approximations: Fdrag=0.0168×U0.8925. The drag coefficient (Cd) was plotted as a function of Reynolds number (Re) as follows: Cd=4744.7×Re−0.93. Cd converged to 0.037 at Re of 105−6 suggesting that small thalli exhibit optimal morphological adaptations to withstand high current speeds.
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