The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform
Jan S. Ribberink - One of the best experts on this subject based on the ideXlab platform.
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wave boundary layer hydrodynamics and sheet flow properties under large scale plunging type breaking waves
Journal of Geophysical Research, 2019Co-Authors: Guillaume Fromant, Tom Odonoghue, David Hurther, J Van Der Zanden, Ivan Caceres, Jan S. RibberinkAbstract:Wave boundary layer (WBL) dynamics are measured with an Acoustic Concentration and Velocity Profiler (ACVP) across the sheet flow-dominated wave-breaking region of regular large-scale waves breaking as a plunger over a developing breaker bar. Acoustic sheet flow measurements are first evaluated quantitatively in comparison to Conductivity Concentration Meter (CCM+) data used as a reference. The near-bed orbital velocity field exhibits expected behaviors in terms of wave shape, intrawave WBL thickness, and velocity phase leads. The observed fully turbulent flow regime all across the studied wave-breaking region supports the model-predicted transformation of free-stream velocity asymmetry into near-bed velocity skewness inside the WBL. Intrawave concentration dynamics reveal the existence of a lower pickup layer and an upper sheet flow layer similar to skewed oscillatory sheet flows, and with similar characteristics in terms of erosion depth and sheet flow layer thickness. Compared to the shoaling region, differences in terms of sheet flow and hydrodynamic properties of the flow are observed at the plunge point, attributed to the locally enhanced wave breaker turbulence. The ACVP-measured total sheet flow transport rate is decomposed into its current-, wave-, and turbulence-Driven Components. In the shoaling region, the sand transport is found to be fully dominated by the onshore skewed wave-Driven Component with negligible phase lag effects. In the outer surf zone, the total net flux exhibits a three-layer vertical structure typical of skewed oscillatory sheet flows. However, in the present experiments this structure originates from offshore-directed undertow-Driven flux, rather than from phase lag effects.
Guillaume Fromant - One of the best experts on this subject based on the ideXlab platform.
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wave boundary layer hydrodynamics and sheet flow properties under large scale plunging type breaking waves
Journal of Geophysical Research, 2019Co-Authors: Guillaume Fromant, Tom Odonoghue, David Hurther, J Van Der Zanden, Ivan Caceres, Jan S. RibberinkAbstract:Wave boundary layer (WBL) dynamics are measured with an Acoustic Concentration and Velocity Profiler (ACVP) across the sheet flow-dominated wave-breaking region of regular large-scale waves breaking as a plunger over a developing breaker bar. Acoustic sheet flow measurements are first evaluated quantitatively in comparison to Conductivity Concentration Meter (CCM+) data used as a reference. The near-bed orbital velocity field exhibits expected behaviors in terms of wave shape, intrawave WBL thickness, and velocity phase leads. The observed fully turbulent flow regime all across the studied wave-breaking region supports the model-predicted transformation of free-stream velocity asymmetry into near-bed velocity skewness inside the WBL. Intrawave concentration dynamics reveal the existence of a lower pickup layer and an upper sheet flow layer similar to skewed oscillatory sheet flows, and with similar characteristics in terms of erosion depth and sheet flow layer thickness. Compared to the shoaling region, differences in terms of sheet flow and hydrodynamic properties of the flow are observed at the plunge point, attributed to the locally enhanced wave breaker turbulence. The ACVP-measured total sheet flow transport rate is decomposed into its current-, wave-, and turbulence-Driven Components. In the shoaling region, the sand transport is found to be fully dominated by the onshore skewed wave-Driven Component with negligible phase lag effects. In the outer surf zone, the total net flux exhibits a three-layer vertical structure typical of skewed oscillatory sheet flows. However, in the present experiments this structure originates from offshore-directed undertow-Driven flux, rather than from phase lag effects.
Catharina Olsson - One of the best experts on this subject based on the ideXlab platform.
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the presence and role of interstitial cells of cajal in the proximal intestine of shorthorn sculpin myoxocephalus scorpius
The Journal of Experimental Biology, 2017Co-Authors: Jeroen Brijs, Grant W Hennig, Annamaria Kellermann, Michael Axelsson, Catharina OlssonAbstract:Rhythmic contractions of the mammalian gastrointestinal tract can occur in the absence of neuronal or hormonal stimulation due to the generation of spontaneous electrical activity by interstitial cells of Cajal (ICC) that are electrically coupled to smooth muscle cells. The myogenically-Driven Component of gastrointestinal motility patterns in fish likely also involves ICC, however, little is known of their presence, distribution and function in any fish species. In the present study, we combined immunohistochemistry and in vivo recordings of intestinal motility to investigate the involvement of ICC in the motility of the proximal intestine in adult shorthorn sculpin ( Myoxocephalus scorpius ) . Antibodies against anoctamin 1 (Ano1, a Ca2+-activated Cl− channel), revealed a dense network of multipolar, repeatedly branching cells in the myenteric region of the proximal intestine, similar in many regards to the mammalian ICC-MY network. The addition of benzbromarone, a potent blocker of Ano1, altered the motility patterns seen in vivo after neural blockade with TTX. The results indicate that ICC are integral for the generation and propagation of the majority of rhythmic contractile patterns in fish , although their frequency and amplitude can be modulated via neural activity.
Tom Odonoghue - One of the best experts on this subject based on the ideXlab platform.
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wave boundary layer hydrodynamics and sheet flow properties under large scale plunging type breaking waves
Journal of Geophysical Research, 2019Co-Authors: Guillaume Fromant, Tom Odonoghue, David Hurther, J Van Der Zanden, Ivan Caceres, Jan S. RibberinkAbstract:Wave boundary layer (WBL) dynamics are measured with an Acoustic Concentration and Velocity Profiler (ACVP) across the sheet flow-dominated wave-breaking region of regular large-scale waves breaking as a plunger over a developing breaker bar. Acoustic sheet flow measurements are first evaluated quantitatively in comparison to Conductivity Concentration Meter (CCM+) data used as a reference. The near-bed orbital velocity field exhibits expected behaviors in terms of wave shape, intrawave WBL thickness, and velocity phase leads. The observed fully turbulent flow regime all across the studied wave-breaking region supports the model-predicted transformation of free-stream velocity asymmetry into near-bed velocity skewness inside the WBL. Intrawave concentration dynamics reveal the existence of a lower pickup layer and an upper sheet flow layer similar to skewed oscillatory sheet flows, and with similar characteristics in terms of erosion depth and sheet flow layer thickness. Compared to the shoaling region, differences in terms of sheet flow and hydrodynamic properties of the flow are observed at the plunge point, attributed to the locally enhanced wave breaker turbulence. The ACVP-measured total sheet flow transport rate is decomposed into its current-, wave-, and turbulence-Driven Components. In the shoaling region, the sand transport is found to be fully dominated by the onshore skewed wave-Driven Component with negligible phase lag effects. In the outer surf zone, the total net flux exhibits a three-layer vertical structure typical of skewed oscillatory sheet flows. However, in the present experiments this structure originates from offshore-directed undertow-Driven flux, rather than from phase lag effects.
Ivan Caceres - One of the best experts on this subject based on the ideXlab platform.
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wave boundary layer hydrodynamics and sheet flow properties under large scale plunging type breaking waves
Journal of Geophysical Research, 2019Co-Authors: Guillaume Fromant, Tom Odonoghue, David Hurther, J Van Der Zanden, Ivan Caceres, Jan S. RibberinkAbstract:Wave boundary layer (WBL) dynamics are measured with an Acoustic Concentration and Velocity Profiler (ACVP) across the sheet flow-dominated wave-breaking region of regular large-scale waves breaking as a plunger over a developing breaker bar. Acoustic sheet flow measurements are first evaluated quantitatively in comparison to Conductivity Concentration Meter (CCM+) data used as a reference. The near-bed orbital velocity field exhibits expected behaviors in terms of wave shape, intrawave WBL thickness, and velocity phase leads. The observed fully turbulent flow regime all across the studied wave-breaking region supports the model-predicted transformation of free-stream velocity asymmetry into near-bed velocity skewness inside the WBL. Intrawave concentration dynamics reveal the existence of a lower pickup layer and an upper sheet flow layer similar to skewed oscillatory sheet flows, and with similar characteristics in terms of erosion depth and sheet flow layer thickness. Compared to the shoaling region, differences in terms of sheet flow and hydrodynamic properties of the flow are observed at the plunge point, attributed to the locally enhanced wave breaker turbulence. The ACVP-measured total sheet flow transport rate is decomposed into its current-, wave-, and turbulence-Driven Components. In the shoaling region, the sand transport is found to be fully dominated by the onshore skewed wave-Driven Component with negligible phase lag effects. In the outer surf zone, the total net flux exhibits a three-layer vertical structure typical of skewed oscillatory sheet flows. However, in the present experiments this structure originates from offshore-directed undertow-Driven flux, rather than from phase lag effects.
