Details
| Original language | English |
|---|---|
| Pages (from-to) | 58-70 |
| Number of pages | 13 |
| Journal | Journal of Ecohydraulics |
| Volume | 7 |
| Issue number | 1 |
| Early online date | 2 Jul 2021 |
| Publication status | Published - 2022 |
Abstract
Seagrass surrogates are commonly used to mimic the behaviour of seagrasses exposed to currents and their effects on flow fields. The interaction is highly dependent on the chosen mechanic and geometric properties of the surrogates and needs to be understood in order to design artificial meadows. The interaction of single surrogates in unidirectional flow fields is studied by means of physical modelling. Surrogates made of plastic materials with different flexural rigidities, buoyancies and geometries are exposed to varying flow velocities. The instantaneous velocity fields in the vicinity and wake of the surrogates are measured by stereoscopic Particle Image Velocimetry (PIV). All employed surrogates disrupt and interact with the flow field by changing their posture. An empirical relation is derived between the flexural rigidity, buoyancy and characteristic diameter of the surrogates and the imposed differences in the attenuation ratio of flow velocities. Further, the approaching flow velocity and distance behind the surrogate influence the estimated attenuation. The vortex shedding frequency imposed by artificial seagrass is lower than frequencies determined for infinite, rigid cylindrical structures. Three main characterizing properties: the modulus of elasticity, buoyancy and cross-sectional dimensions need to be taken into account for design of artificial seagrass meadows. Our findings advance knowledge of fluid-structure interactions of flexible materials and help to progress proper design of artificial seagrass meadows.
Keywords
- Artificial seagrass, flexible surrogates, flow-vegetation interaction, stereoscopic PIV, submerged vegetation
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Environmental Science(all)
- Water Science and Technology
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In: Journal of Ecohydraulics, Vol. 7, No. 1, 2022, p. 58-70.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Flow field and wake structure characteristics imposed by single seagrass blade surrogates
AU - Taphorn, Mareike
AU - Villanueva Granados, Raul Armando
AU - Paul, Maike
AU - Visscher, Jan Hendrik
AU - Schlurmann, Torsten
N1 - Funding Information: This work received financial support by the MWK Lower Saxony, Germany and the Volkswagen Foundation through the Project SeaArt (Grant No. ZN3187). We would like to thank our project partners Hannah Behnsen and Carmen Arndt for conducting the tensile and bending strength test and providing valuable results for the herein used modulus of elasticity. All figures were created with Matlab and the scientific colormaps of Fabio Crameri (Crameri, 2018) were used to prevent visual distortion of the data (Crameri et al., 2020).
PY - 2022
Y1 - 2022
N2 - Seagrass surrogates are commonly used to mimic the behaviour of seagrasses exposed to currents and their effects on flow fields. The interaction is highly dependent on the chosen mechanic and geometric properties of the surrogates and needs to be understood in order to design artificial meadows. The interaction of single surrogates in unidirectional flow fields is studied by means of physical modelling. Surrogates made of plastic materials with different flexural rigidities, buoyancies and geometries are exposed to varying flow velocities. The instantaneous velocity fields in the vicinity and wake of the surrogates are measured by stereoscopic Particle Image Velocimetry (PIV). All employed surrogates disrupt and interact with the flow field by changing their posture. An empirical relation is derived between the flexural rigidity, buoyancy and characteristic diameter of the surrogates and the imposed differences in the attenuation ratio of flow velocities. Further, the approaching flow velocity and distance behind the surrogate influence the estimated attenuation. The vortex shedding frequency imposed by artificial seagrass is lower than frequencies determined for infinite, rigid cylindrical structures. Three main characterizing properties: the modulus of elasticity, buoyancy and cross-sectional dimensions need to be taken into account for design of artificial seagrass meadows. Our findings advance knowledge of fluid-structure interactions of flexible materials and help to progress proper design of artificial seagrass meadows.
AB - Seagrass surrogates are commonly used to mimic the behaviour of seagrasses exposed to currents and their effects on flow fields. The interaction is highly dependent on the chosen mechanic and geometric properties of the surrogates and needs to be understood in order to design artificial meadows. The interaction of single surrogates in unidirectional flow fields is studied by means of physical modelling. Surrogates made of plastic materials with different flexural rigidities, buoyancies and geometries are exposed to varying flow velocities. The instantaneous velocity fields in the vicinity and wake of the surrogates are measured by stereoscopic Particle Image Velocimetry (PIV). All employed surrogates disrupt and interact with the flow field by changing their posture. An empirical relation is derived between the flexural rigidity, buoyancy and characteristic diameter of the surrogates and the imposed differences in the attenuation ratio of flow velocities. Further, the approaching flow velocity and distance behind the surrogate influence the estimated attenuation. The vortex shedding frequency imposed by artificial seagrass is lower than frequencies determined for infinite, rigid cylindrical structures. Three main characterizing properties: the modulus of elasticity, buoyancy and cross-sectional dimensions need to be taken into account for design of artificial seagrass meadows. Our findings advance knowledge of fluid-structure interactions of flexible materials and help to progress proper design of artificial seagrass meadows.
KW - Artificial seagrass
KW - flexible surrogates
KW - flow-vegetation interaction
KW - stereoscopic PIV
KW - submerged vegetation
UR - http://www.scopus.com/inward/record.url?scp=85113152688&partnerID=8YFLogxK
U2 - 10.15488/13044
DO - 10.15488/13044
M3 - Article
VL - 7
SP - 58
EP - 70
JO - Journal of Ecohydraulics
JF - Journal of Ecohydraulics
SN - 2470-5357
IS - 1
ER -