Drag and inertia coefficients of live and surrogate shellfish dropper lines under steady and oscillatory flow

verfasst von

Jannis Landmann, Lukas Fröhling, Rebekka Gieschen, Bela H. Buck, Kevin Heasman, Nicholas Scott, Malcolm Smeaton, Nils Goseberg, Arndt Hildebrandt

Abstract

Against the background of a drastically increased demand of marine proteins, off-bottom, bivalve aquaculture, provides significant potential for production growth when moved into more energetic marine waters. Hence, research, industry and politics are currently proposing the development of new offshore sites. The highly energetic conditions at these sites present a challenging environment for bivalve aquaculture. In this work, physical experiments of suspended bivalves provide new knowledge on the commonly used design parameters: the drag and inertia coefficients. Live bivalves and manufactured surrogate models at a 1:1 scale were tested in a towing tank as well as under waves. The drag coefficient of live blue mussels was determined to be C

_d = 1.6 for Reynolds numbers between 2.3 × 10

⁴ and 1.4 × 10

⁵. The inertia coefficient obtained from the wave tests was C

_m = 2.1 for Keulegan Carpenter numbers KC < 10. In a pursuit to better understand the differences between live mussels and surrogates in laboratory conditions, the analysis revealed that appropriate surrogates can be identified. A method to determine the characteristic diameter of mussel dropper lines is suggested. The results facilitate the future design of aquaculture systems in high-energy environments and allow for an integration into numerical models.

Organisationseinheit(en)

Ludwig-Franzius-Institut für Wasserbau, Ästuar- und Küsteningenieurwesen

Externe Organisation(en)

Technische Universität Braunschweig
Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung
Hochschule Bremerhaven
Cawthron Institute

Typ

Artikel

Journal

Ocean engineering

Band

235

ISSN

0029-8018

Publikationsdatum

01.09.2021

Publikationsstatus

Veröffentlicht

Peer-reviewed

ASJC Scopus Sachgebiete

Meerestechnik, Environmental engineering

Ziele für nachhaltige Entwicklung

SDG 14 – Lebensraum Wasser

Elektronische Version(en)

https://doi.org/10.1016/j.oceaneng.2021.109377 (Zugang: Offen)