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Relevant bibliographies by topics / Tidal friction

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Academic literature on the topic 'Tidal friction'

Author: Grafiati

Published: 3 June 2025

Last updated: 23 June 2025

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Journal articles on the topic "Tidal friction"

1

Mazé, Robert. "Tidal Rectification: Friction or Not Friction?" Journal of Physical Oceanography 28, no. 7 (1998): 1333–45. http://dx.doi.org/10.1175/1520-0485(1998)028<1333:trfonf>2.0.co;2.

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Roshan, Mahmood, and Bahram Mashhoon. "Dynamical Friction and Tidal Interactions." Astrophysical Journal 926, no. 1 (2022): 44. http://dx.doi.org/10.3847/1538-4357/ac4241.

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Abstract We discuss dynamical friction in an N-body system in the presence of tidal interactions caused by a distant external source. Using the distant tide approximation, we develop a perturbation scheme for the calculation of dynamical friction that takes tidal effects into account in linear order. In this initial analytic approach to the problem, we neglect the influence of tides on the distribution function of stars in the background stellar system. Our result for the dynamical friction force in the appropriate limit is in agreement with Chandrasekhar’s formula in the absence of tides. We provide preliminary estimates for the tidal contributions to the dynamical friction force. The astrophysical implications of our results are briefly discussed.

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Kiseleva, L. G., P. P. Eggleton, and S. Mikkola. "Tidal friction in triple stars." Monthly Notices of the Royal Astronomical Society 300, no. 1 (1998): 292–302. http://dx.doi.org/10.1046/j.1365-8711.1998.01903.x.

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Pingree, R. D., and D. K. Griffiths. "Tidal friction for semidiurnal tides." Continental Shelf Research 7, no. 10 (1987): 1181–209. http://dx.doi.org/10.1016/0278-4343(87)90084-7.

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Langer, N. "A lubricant for tidal friction." Astronomy & Astrophysics 500, no. 1 (2009): 133–34. http://dx.doi.org/10.1051/0004-6361/200912151.

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Rodríguez, Adrián, Sylvio Ferraz-Mello, and Hauke Hussmann. "Tidal friction in close-in planets." Proceedings of the International Astronomical Union 3, S249 (2007): 179–86. http://dx.doi.org/10.1017/s174392130801658x.

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AbstractWe use Darwin's theory (Darwin, 1880) to derive the main results on the orbital and rotational evolution of a close-in companion (exoplanet or planetary satellite) due to tidal friction. The given results do not depend on any assumption linking the tidal lags to the frequencies of the corresponding tide harmonics (except that equal frequency harmonics are assumed to span equal lags). Emphasis is given to the study of the synchronization of the planetary rotation in the two possible final states for a non-zero eccentricity : (1) the super-synchronous stationary rotation resulting from the vanishing of the average tidal torque; (2) the capture into a 1:1 spin-orbit resonance (true synchronization), which is only possible if an additional torque exists acting in opposition to the tidal torque. Results are given under the assumption that this additional torque is produced by a non-tidal permanent equatorial asymmetry of the planet. The indirect tidal effects and some non-tidal effects due to that asymmetry are considered. For sake of comparison with other works, the results obtained when tidal lags are assumed proportional to the corresponding tidal wave frequencies are also given.

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Vo, Phuoc Luong Hong, and Phuc Tran Duy Le. "TIDAL ASYMMETRY IN MANGROVE CREEKS." Science and Technology Development Journal 14, no. 4 (2011): 86–92. http://dx.doi.org/10.32508/stdj.v14i4.2030.

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A simple analytical model for flow in the creeks is formulated, built up and applied in the real conditions in Nang Hai creek, Can Gio mangrove Biosphere Reserve (Ho Chi Minh city).Observed data of current speed and water level in the creek in the year of 2005 were used to find the friction coefficients in the mangrove swamp and to apply in the model. Results from calculated modeling show obviously the tidal asymmetry in mangrove creek. The peaks of current speed at flood and ebb tides are not equal as the swamp is inundated. The friction coefficients have the great influence in the tidal asymmetry. The friction coefficient in the creek can change remarkably the current speed in the creek, inducing the changes of the current speed peaks. The friction coefficient in the swamp has much less influenced to the current speed in the creeks.

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Munk, Walter. "Once again: once again—tidal friction." Progress in Oceanography 40, no. 1-4 (1997): 7–35. http://dx.doi.org/10.1016/s0079-6611(97)00021-9.

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Goldreich, Peter, and Philip D. Nicholson. "Tidal friction in early-type stars." Astrophysical Journal 342 (July 1989): 1079. http://dx.doi.org/10.1086/167665.

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Gusti, Gillang Noor Nugrahaning, Kiyosi Kawanisi, Mohamad Basel Al Sawaf, and Faruq Khadami. "Subtidal Dynamics in a Tidal River with Limited Discharge." Water 14, no. 16 (2022): 2585. http://dx.doi.org/10.3390/w14162585.

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Investigating subtidal friction and mass transport is pivotal for examining subtidal dynamics in tidal rivers. Although the behavior of subtidal friction and transport has been discussed in recent years, most studies have been conducted on tidal rivers that are affected by high amounts of river runoff. The aim of this study is to offer an initial understanding of the spatial and temporal behaviors of subtidal friction and subtidal flux in a tidal river channel with limited river runoff. This study utilized the frequency domain and theoretical decomposition analyses to determine the dominant tidal and subtidal mechanisms. Frequency domain analysis indicated the dominance of semidiurnal and diurnal tides in the observed tidal river channel. The rate of energy transfer owing to shallow water interaction was found to be stronger for the current velocity than for the water elevation. Decomposition analysis showed that subtidal friction and flux in a low-discharge tidal river channel were largely influenced by subtidal flow-induced subtidal friction and Eulerian return flux, respectively. The key findings of this study are as follows: (i) the limited amount of river runoff (4–20 m3/s) leads to the vertical variability of subtidal friction contributions from subtidal flow and subtidal-tidal interaction, as well as Eulerian return flux, and (ii) the vertical variability of the aforementioned terms can be associated with the existence of influential longitudinal subtidal density gradients along the tidal river. We believe that these findings advance our understanding of subtidal dynamics in tidal river systems, particularly those with limited discharge.

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Dissertations / Theses on the topic "Tidal friction"

1

Venn, J. F. "Shallow sea tidal friction and sediment transport." Thesis, London Metropolitan University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238297.

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Retana, Angel Gabriel. "Salinity Transport in a Finite-Volume Sigma-Layer Three-Dimensional Model." ScholarWorks@UNO, 2008. http://scholarworks.uno.edu/td/880.

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The objective of this study was to develop a 3-D model for The Pontchartrain Estuary that was capable of long-term mass conservative simulation of salinities. This was accomplished in a multi-stage approach involving: a physical model of salinity exchange through a pass; a 3-D FVCOM model of the physical experiment; the development and testing of an FVCOM model for an idealized Pontchartrain Basin; and for the entire estuary. The data from the physical model tests were used to validate the performance of the FVCOM model with density-driven flows. These results showed that hydrostatic FVCOM captured the primary internal wave movement. The idealized basin simulations were used to evaluate several issues related to salinity transport, namely the relative importance of baroclinic forcing, tidal forcing and hydrology. The idealized domain also permitted the testing of sigma-gradients, spatial distribution of friction coefficients, wind stress and various boundary treatments. The results showed that the density-driven exchange of saltwater at the open boundary required a baroclinic boundary condition for salinity as well as a lateral filter at the boundary on each sigma layer. A new radiative baroclinic open boundary condition was developed for FVCOM. When tides and hydrology were included, the FVCOM model was shown to reproduce the seasonal salinity that has been observed for long-term periods. It was also found that the simulation of tides and salinity in FVCOM is very sensitive to the spatial distribution of the friction coefficient; relatively low friction was required in the open water regions and high friction was needed in the passes and waterways to reproduce the tides and salinity distribution. A variable friction coefficient option was coded on FVCOM. The findings from the idealized model were utilized to setup two models for the actual estuary. Both models extend from Lake Maurepas, one to the Chandeleurs Islands and the other to Mobile Bay. The baroclinic open boundary and variable friction were implemented in these models. They were calibrated for tides and salinity. The 2008 Bonnet Carré Spillway Opening was applied to the first model. A tidal pumping effect in Lake Pontchartrain was observed and captured by the model.

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Chalumeau, Julien. "Modélisation numérique de la circulation côtière : application au transport des méduses dans les Pertuis Charentais." Thesis, La Rochelle, 2014. http://www.theses.fr/2014LAROS005/document.

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Les Pertuis Charentais sont un site d’écosystèmes interconnectés où les courants marins jouent un rôle déterminant. Un modèle de marée à haute résolution a été développé au cours de cette thèse pour comprendre et cartographier les traits principaux de la circulation hydrodynamique dans les Pertuis. Deux axes sont ainsi mis en avant dans cette étude. D’abord, un nouveau modèle de marées dans les Pertuis Charentais a été construit et validé à partir de différentes sources : données marégraphiques, données de courantomètres ADCP et images satellitaires. Une nouvelle approche de calibration de modèle de marée a été développée, basée sur la comparaison de la position de la ligne d’eau, frontière entre l’eau et la terre, avec celle prédite par le modèle. Puis dans un second temps, le transport et les agrégations en « bloom » de populations de méduses Rhizostoma, dont les proliférations et les échouages sont à l’origine de problèmes socio-économiques, ont été simulés numériquement. Des observations in situ ont permis de paramétrer le comportement de nage des méduses dans le modèle. Deux types de comportements des méduses, actif et passif ont été simulés. Les courants de marées en présence des forçages-type météorologiques ont été pris en compte. Les résultats indiquent que le comportement individuel de nage des méduses pourrait être une réponse adaptative aux facteurs abiotiques qui menacent la continuité de leur espèce mais que les courants marins restent la cause première de la formation des blooms<br>The Pertuis Charentais are an interconnected ecosystems site where ocean currents play a key role. A high resolution tidal model was developed in this thesis in order to understand the main features of the hydrodynamic flows inside the Pertuis. Two topics were put forward in this study. First, a new tide model for the Pertuis Charentais was build up and validated by using different datasets: tide gauge records, measurements of currents by ADCP and satellite images. A new approach to model calibration was developed by comparing the observed position of the waterline, the boundary between land and water, with that predicted by the model. Secondly, the transport and bloom-like aggregation of the Rhizostoma jellyfish populations were simulated numerically. The jellyfish proliferation and stranding are a source of socio-economic problems. Two types of jellyfish behavior, active and passive were simulated. The tidal currents and typical meteorological forcing were taken into account. The results show that the individual behavior of swimming jellyfish is an adaptive response to abiotic factors for jellyfish survival

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Jousset, Solène. "Vers l'assimilation de données estimées par radar Haute Fréquence en mer macrotidale." Thesis, Brest, 2016. http://www.theses.fr/2016BRES0029/document.

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La Mer d’Iroise est observée depuis 2006, par des radars à haute fréquence (HF) qui estiment les courants de surface. Ces mesures ont une finesse temporelle et spatiale pour permettre de capturer la dynamique fine du domaine côtier. Ce travail de thèse vise à la conception et l’application d’une méthode d’assimilation de ces données dans un modèle numérique réaliste pour optimiser le frottement sur le fond et corriger l’état du modèle afin de mieux représenter la circulation résiduelle de marée et les positions des fronts d’Ouessant en mer d’Iroise. La méthode d’assimilation de données utilisée est le Filtre de Kalman d’Ensemble dont l’originalité est l’utilisation d’une modélisation stochastique pour estimer l’erreur du modèle. Premièrement, des simulations d’ensemble ont été réalisées à partir de la perturbation de différents paramètres du modèle considérés comme sources d’erreur : le forçage météo, la rugosité de fond, la fermeture turbulente horizontale et la rugosité de surface. Ces ensembles ont été explorés en termes de dispersion et de corrélation d’ensemble. Un Lisseur de Kalman d’Ensemble a ensuite été utilisé pour optimiser la rugosité de fond (z0) à partir des données de courant de surface et d’un ensemble modèle réalisé à partir d’un z0 perturbé et spatialisé. La méthode a d’abord été testée en expérience jumelle puis avec des observations réelles. Les cartes du paramètre z0, optimisés, réalisées avec des observations réelles, ont ensuite été utilisées dans le modèle sur une autre période et les résultats ont été comparés avec des observations sur la zone. Enfin, des expériences jumelles ont été mises en place pour corriger l’état modèle. Deux méthodes ont été comparées, une prenant en compte la basse fréquence en filtrant la marée des données et du modèle pour réaliser l’analyse ; l’autre prenant en compte tout le signal. Avec ces expériences, on a tenté d’évaluer la capacité du filtre à contrôler à la fois la partie observée du vecteur d’état (courant de surface) et la partie non-observée du système (température de surface)<br>The Iroise Sea has been observed since 2006 by High Frequency (HF) radars, which estimate surface currents. These measurements offer high resolution and high frequency to capture the dynamics of the coastal domain. This thesis aims at designing and applying a method of assimilation of these data in a realistic numerical model to optimize the bottom friction and to correct the model state in order to improve the representation of the residual tidal circulation and the positions of the Ushant fronts in the Iroise Sea. The method of data assimilation used is the Ensemble Kalman Filter. The originality of this method is the use of a stochastic modeling to estimate the model error. First, ensemble simulations were carried out from the perturbation of various model parameters which are the model error sources: meteorological forcing, bottom friction, horizontal turbulent closure and surface roughness. These ensembles have been explored in terms of dispersion and correlation. An Ensemble Kalman smoother was used to optimize the bottom friction (z0) from the surface current data and from an ensemble produced from a perturbed and spatialized z0. The method is tested with a twin experiment and then with real observations. The optimized maps of parameter z0, produced with the real currents, were used in the model over another period and the results were compared with independent observations. Finally, twin experiments were conducted to test the model state correction. Two approaches were compared; first, only the low frequency, by filtering the tide in the data and in the model, is used to perform the analysis. The other approach takes the whole signal into account. With these experiments, we assess the filter's ability to control both the observed part of the state vector (currents) and the unobserved part of the system (Sea surface Temperature)

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Lee, Cyuan-Chen, and 李權宸. "Tidal Reflection and Friction Effects in Estuaries." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/34195809350439485352.

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博士<br>中興大學<br>土木工程學系所<br>95<br>The hydrodynamic characteristics in tidal reach because of be subjected to ocean tide it rise to fall, the river runoff and density current, even the influence of the particularity (as Bed material, Slope, Channel section convergent etc.) of morphology, thus it may be known hydrodynamic change of the tidal reach to for complex. This research aims at tidal wave only to consider to bed friction effect and reflection effect because of geography variation in Dry season in the estuary, discusses it to influence of estuary hydrodynamics change. This paper adopts Eulerian coordinates viewpoint, the incident wave progressing up to the estuary is considered to be a tidal wave amplitude reduction with friction effect, and tidal wave reflection rise up because channel section convergent of merge effects, tidal water level variety and tidal current velocity data using the observation, estimate the friction effects and reflection effect of tidal reach. The research in take the Wu River and Keelung River as analyze a case respectively. By way of the entire estuary, Whole tide water level and tidal velocity data of was observed hourly. Based on the Partial Reflection wave theories that this research deduces, can estimate reflection effect and friction effects of tidal reach respectively. Because tidal velocity observed data are lack, Wu river estuary respectively by the standing wave and progressive wave theoretical analysis, demonstrated finally Wu river estuary, its hydrodynamic characteristics mainly affects for the friction effect influence, but the reflection effect influence is really small, and unable to determine its influence degree. Carries on the analysis on the Keelung River tidal reach, besides depends on the standing wave and the progressive wave theoretical analysis, because its observed data are more complete, and part of reflected wave theoretical analysis according to this article establishment, after pushes estimates tidal wave of reflection coefficient ω is about 0.75(2005/6/22) and 0.69(2006/9/13) in Bailing-Bridge station, finally demonstrated that reflected wave of phenomenon this estuary is quite obvious, it pushes respectively corresponds Manning the coefficient n value is 0.0410 and 0.0393 s/m1/3. Simultaneously penetrates Savenije(1998) as analysis of law the coordinate viewpoint comes take Lagrangian to confirm, the analysis result its wave- type number sinε is approximately 0.3 and 0.36 (sinε = 0 for the total reflection standing wave), Estimates Manning coefficient n value is 0.0443 and 0.0381 s/m1/3, depends on the Partial Reflection wave theoretical analysis result with this research to be close. Estimate of tidal current velocity for Keelung River estuary, as depend on Steady Uniform flow of assumption, take the river surface average hydraulic slope, Apply on-site observation obtained tidal velocity calculates its Manning coefficient n value (by Keelung River as example, respectively is 0.0415 and 0.0370 s/m1/3 ), its result with this paper method estimate value to be close . And through this paper estimate values by Partial Reflection wave theories (Reflection coefficient ω , Tidal wave number k and Damping modulus μ ), can solve accurately instant hydraulic slope in the tidal reach ,according to this hydraulic slope, it then quotes from of Manning coefficient n value, proper for respond the n value of the bottom bed particle size in estuary.

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Wan, Di. "Modelling of barotropic M2 tidal circulation with friction effects in Kyuquot Sound." Thesis, 2013. http://hdl.handle.net/1828/5101.

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This thesis examines the barotropic M2 tidal circulation and associated oceanographic properties in the Kyuquot Sound. The main contribution of this thesis is the development of a simple analytical model based on results from a Finite-Volume Coastal Ocean Model (FVCOM), describing a two-channel system. The simple analytical model allows us to estimate the energy dissipation rate in Crowther Channel and recognizes that friction is responsible for phase difference (between currents and elevation) variations as we move along the channel. This is done without running complex numerical models or collecting extensive observation data. We found a difference in velocity phases between a dominant channel (Kyuquot Channel) and a secondary channel (Crowther Channel) in Kyuquot Sound. The velocity phase response in the secondary channel is out of phase with the dominant channel, and varies when we move along the channel, while the elevation phases are consistent between the two channels. This result has a potentially significant impact on future biological and navigation decisions. Our research is also focused on getting a general understanding of the circulation in Kyuquot Sound, and offers an energy budget comparison between the analytical and numerical model results. These results allow the contrast between the simple analytical and the numerical model to be clarified, as the advantages and limitations of both are discussed in detail.<br>Graduate<br>0415<br>0759<br>0547<br>diwan@uvic.ca

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Books on the topic "Tidal friction"

1

Anja Ganster - Tidal Friction (Constellation 6). Modo Verlag Gmbh, 2018.

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Tidal Friction and the Earth's Rotation. Springer, 2011.

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Brosche, P., Jürgen Sündermann, and M. Bonatz. Tidal Friction and the Earth's Rotation. Springer London, Limited, 2012.

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Brosche, Peter. Tidal Friction and the Earth's Rotation. Springer London, Limited, 2013.

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Brosche, P., and Jürgen Sündermann. Tidal Friction and the Earth's Rotation II: Proceedings of a Workshop Held at the Centre for Interdisciplinary Research of the University of Bielefeld, September 28-October 3 1981. Springer London, Limited, 2012.

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Book chapters on the topic "Tidal friction"

1

Kostelecký, J. "Celestial Mechanics of Present Tidal Friction." In Earth’s Rotation from Eons to Days. Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75587-3_10.

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Kreitmair, Monika Johanna. "Uncertainty in Background Friction." In The Effect of Uncertainty on Tidal Stream Energy Resource Estimates. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57658-5_4.

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Kiseleva, L. G., and P. P. Eggleton. "Can Combination of ‘Kozai Effect’ and Tidal Friction Produce Close Stellar and Planetary Orbits?" In Impact of Modern Dynamics in Astronomy. Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4527-5_58.

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Kawahara, Mutsuto, Akira Anju, and Kenichiro Matsumoto. "Parameter Identification of Bottom Friction and Eddy Viscosity of Tidal Flow in Tokyo Bay." In Computational Methods in Water Resources X. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9204-3_130.

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Kiseleva, L. G., and P. P. Eggleton. "Tidal Friction in Triple Systems: A Means of Producing Close Stellar and Planetary Orbits." In The Dynamics of Small Bodies in the Solar System. Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-015-9221-5_40.

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Smith, Stewart W., and Charles G. Sammis. "Revisiting the Tidal Activation of Seismicity With A Damage Mechanics and Friction Point of View." In Computational Earthquake Science Part II. Birkhäuser Basel, 2004. http://dx.doi.org/10.1007/978-3-0348-7875-3_20.

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Bowers, David George, and Emyr Martyn Roberts. "7. Tidal mixing." In Tides: A Very Short Introduction. Oxford University Press, 2019. http://dx.doi.org/10.1093/actrade/9780198826637.003.0007.

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‘Tidal mixing’ describes tidal mixing in shelf seas, where the water is shallow and tidal currents can be much faster than in the deep ocean. Most of the energy lost from the tide through friction is first converted into turbulence, which then makes a very effective mixing mechanism, stirring the Sun’s heat downwards. Shelf seas at temperate latitudes in summer are divided into stratified regions and vertically mixed regions, depending on the tidal streams’ strength and the water depth. The transition from one to the other happens rapidly and creates a tidal mixing front. Tidal mixing in estuaries is also discussed along with the harnessing of tides to generate electricity.

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Bowers, David George, and Emyr Martyn Roberts. "6. Tides and the Earth." In Tides: A Very Short Introduction. Oxford University Press, 2019. http://dx.doi.org/10.1093/actrade/9780198826637.003.0006.

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‘Tides and the Earth’ explains that the energy in tides comes, ultimately, from the Earth’s spin. Tidal streams, rubbing against the seabed, lose energy through friction and, to make up for this loss, energy is transferred into the tide from the Earth’s spin. As a result, Earth’s rotation is gradually slowing and the day is lengthening. Most tidal friction happens in shelf seas, where the currents are strongest and the water is shallow, but there is an additional loss of energy in the body of the deep ocean, through the creation of waves called internal tides, which mix the interior of the deep ocean.

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"Tidal friction and the ephemerides of the Sun and Moon." In Historical Eclipses and Earth's Rotation. Cambridge University Press, 1997. http://dx.doi.org/10.1017/cbo9780511525186.002.

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Toon, Owen Brian, and Alan Robock. "Clues from Craters, Assured Destruction, and Ejecta Layers." In Earth in Flames. Oxford University PressNew York, NY, 2025. https://doi.org/10.1093/9780197799734.003.0004.

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Abstract Impacts of large asteroids make craters, create blast waves and tsunamis, and produce a light pulse that can start fires. The impact that killed the non-avian dinosaurs had the energy of 100 million high-yield atomic weapons and created a crater about 200 km in diameter. Immense tidal waves spread across what is now the Gulf of Mexico, and rocky and melted debris fell as far away from the crater as Canada. In addition, rock vapor spread far out into space, where it cooled and condensed to form sand-sized rocks. As these fell back to Earth as shooting stars, friction with the atmosphere heated the rocks and air. In 66-million-year-old sediments, there are thousands of remnant shooting stars per square centimeter still left as well as soot from the global fires started by the infrared radiation from the glowing skies created by the shooting stars.

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Conference papers on the topic "Tidal friction"

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Song, Z. Y., C. Cheng, F. M. Xu, and J. Kong. "On the Friction Coefficient in the Numerical Simulation of Tidal Wave Propagation." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40275.

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Based on the analytical solution of one-dimensional simplified equation of damping tidal wave and Heuristic stability analysis, the precision of numerical solution, computational time and the relationship between the numerical dissipation and the friction dissipation are discussed with different numerical schemes in this paper. The results show that (1) when Courant number is less than unity, the explicit solution of tidal wave propagation has higher precision and requires less computational time than the implicit one; (2) large time step is allowed in the implicit scheme in order to reduce the computational time, but the precision of the solution also reduce and the calculation precision should be guaranteed by reducing the friction factor: (3) the friction factor in the implicit solution is related to Courant number, presented as the determined friction factor is smaller than the natural value when Courant number is larger than unity, and their relationship formula is given from the theoretical analysis and the numerical experiments. These results have important application value for the numerical simulation of the tidal wave.

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Graber, S. David. "Perspective on the Tidal Bore: Channel Taper, Friction, Building, Maximum Height, Variation, Dissipation." In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72114.

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Building upon a companion paper, the present paper addresses additional mechanisms of the tidal bore, including channel taper and friction; building, maximum height, variation, and dissipation of the bore; and standing waves. Early studies of these mechanisms are cited and discussed in historical context. Relationships developed to investigate the effects of horizontal channel taper, vertical channel taper, and channel friction agree qualitatively with and explain field observations. Building of the bore is explained, with favorable comparison of methodology with flume observations. The maximum height that the bore is capable of achieving is one of its most interesting features; this is explained in terms agreeing with experimental observation. The two forms of the jump, undular and wall-like, are discussed. The variation of the bore height as it moves into regions of greater or lesser depth is described from field observations and flume observation, and relationships derived which explain such variation. Frictional dissipation of the bore is discussed. Standing waves that occur after the tidal bore has passed are explained as a separate phenomenon.

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Kong, Congying, and Chunhui Li. "Influence of Sea Bottom Friction Coefficient on tidal modeling around the Coast of China." In 2022 3rd International Conference on Geology, Mapping and Remote Sensing (ICGMRS). IEEE, 2022. http://dx.doi.org/10.1109/icgmrs55602.2022.9849322.

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Wang, Jian, Yonggang Wang, Xiumin Gao, and Peng Ren. "Solution of Tidal Equations and Inversion of Bottom Friction Coefficient Based on Neural Networks." In OCEANS 2022, Hampton Roads. IEEE, 2022. http://dx.doi.org/10.1109/oceans47191.2022.9977306.

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Zhu, Xiao-Hua, Xiao-Hua Zhu, Ze-Nan Zhu, Ze-Nan Zhu, Xinyu Guo, and Xinyu Guo. "MAPPING TIDAL CURRENTS AND RESIDUAL CURRENTS BY USE OF COASTAL ACOUSTIC TOMOGRAPHY." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b94407213d3.12732916.

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A coastal acoustic tomography (CAT) experiment for mapping the tidal currents in the Zhitouyang Bay was successfully carried out with seven acoustic stations during July 12 to 13, 2009. The horizontal distributions of tidal current in the tomography domain are calculated by the inverse analysis in which the travel time differences for sound traveling reciprocally are used as data. Spatial mean amplitude ratios M2 : M4 : M6 are 1.00 : 0.15 : 0.11. The shallow-water equations are used to analyze the generation mechanisms of M4 and M6. In the deep area, velocity amplitudes of M4 measured by CAT agree well with those of M4 predicted by the advection terms in the shallow water equations, indicating that M4 in the deep area where water depths are larger than 60 m is predominantly generated by the advection terms. M6 measured by CAT and M6 predicted by the nonlinear quadratic bottom friction terms agree well in the area where water depths are less than 20 m, indicating that friction mechanisms are predominant for generating M6 in the shallow area. Dynamic analysis of the residual currents using the tidally averaged momentum equation shows that spatial mean values of the horizontal pressure gradient due to residual sea level and of the advection of residual currents together contribute about 75% of the spatial mean values of the advection by the tidal currents, indicating that residual currents in this bay are induced mainly by the nonlinear effects of tidal currents.

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Zhu, Xiao-Hua, Xiao-Hua Zhu, Ze-Nan Zhu, Ze-Nan Zhu, Xinyu Guo, and Xinyu Guo. "MAPPING TIDAL CURRENTS AND RESIDUAL CURRENTS BY USE OF COASTAL ACOUSTIC TOMOGRAPHY." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b43165d9d73.

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Abstract:

A coastal acoustic tomography (CAT) experiment for mapping the tidal currents in the Zhitouyang Bay was successfully carried out with seven acoustic stations during July 12 to 13, 2009. The horizontal distributions of tidal current in the tomography domain are calculated by the inverse analysis in which the travel time differences for sound traveling reciprocally are used as data. Spatial mean amplitude ratios M2 : M4 : M6 are 1.00 : 0.15 : 0.11. The shallow-water equations are used to analyze the generation mechanisms of M4 and M6. In the deep area, velocity amplitudes of M4 measured by CAT agree well with those of M4 predicted by the advection terms in the shallow water equations, indicating that M4 in the deep area where water depths are larger than 60 m is predominantly generated by the advection terms. M6 measured by CAT and M6 predicted by the nonlinear quadratic bottom friction terms agree well in the area where water depths are less than 20 m, indicating that friction mechanisms are predominant for generating M6 in the shallow area. Dynamic analysis of the residual currents using the tidally averaged momentum equation shows that spatial mean values of the horizontal pressure gradient due to residual sea level and of the advection of residual currents together contribute about 75% of the spatial mean values of the advection by the tidal currents, indicating that residual currents in this bay are induced mainly by the nonlinear effects of tidal currents.

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Pawlak, Geno, Parker MacCready, Kathleen A. Edwards, and Ryan M. McCabe. "Evolution of Tidal Vorticity in Stratified Coastal Flow." In ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28116.

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The lifespan of a tidal eddy generated by flow around a coastal headland is examined. Field observations of a tidal headland eddy at Three Tree Point, WA (USA) are presented that examine the temporal evolution of the flood tide separation eddy from its generation, through the eddy release at the turn of the tide, until its dissipation during subsequent tidal cycles. Ship-based acoustic profiling examines the vertical structure of the velocity field and subsurface drogued drifters are used to track the horizontal motion of the flow structure. Drifter tracks from successive days at similar phases of the tide indicate that flow structure is repeatable. The combined set of drifter tracks is used to obtain an estimate of eddy lifetime. Time scales for vorticity decay of less than a tidal period are significantly shorter than simple estimates using boundary friction would imply. This finding suggests that the internal wave response of the stratified flow over the sloping headland plays a significant role in the dissipation of vorticity. Field observations are compared with results from numerical modeling that also suggest that baroclinic effects are significant.

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Hao, Jialing, Jinhai Zheng, and Wei Zhang. "Observations of the Boundary Layer Characteristics at the Yangtze Estuary." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79897.

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Measurements of the flow velocity profiles through one tidal cycle were taken in the Yangtze Estuary. The flow velocity profile during the experiment was characteristic of a tidal boundary layer growing through the tide, and with increasing velocity, especially on the accelerating flood tide. Due to the bed friction, the near bottom flow, which forms the bottom boundary layer, is different from that of the water body far from the bed in estuarine and coastal waters. In near bottom layer, due to the frequent flux and momentum exchanges between the flow and the bed, the study of near bottom plays an important role in vertical mixing of water, sand, temperature, salinity and the process of bed-load movement. Some scholars point out that due to the acceleration or deceleration action of tide, the flow structure deviates from traditional logarithmic law in estuary, coast or other near shore waters. In a previous study by the authors, it was shown that the measured vertical profile of tidal current agrees better with a logarithmic-linear model than logarithmic model through the theoretical derivation and case verification. The friction velocity u* and the roughness length z0 are calculated based on a logarithmic-linear tidal current velocity model and compared with that of using traditional logarithmic model also. Some of the sample sites were selected to analyze the distribution of the friction velocity u* and the roughness length z0 with the temporal and spatial variation. The derivation of the boundary layer parameters was restricted to profiles when the mean current speed almost increased with height and is greater than 0.3 m/s to exclude the periods around slack water. From profiles that showed an increasing speed with height, the parameters u*, z0 and CD are estimated and presented here. The methods of deriving the shear stress from vertical profiles are discussed and the drag coefficients are presented.

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Hao, Jialing, Yixin Yan, Zhiyao Song, and Changnan Wang. "The Preliminary Study on Comparison of Velocity Distribution Models Under the Same Roughness Length." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92417.

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Previous studies pointed out that due to the acceleration or deceleration action of tide current, the flow structure deviates from traditional logarithmic law in estuary, coast or other near shore water. The tidal velocity distribution model was derived and compared with the traditional logarithmic model. It should be pointed out that the velocity data adopted have four layers within one meter above the bed, and the roughness length z0 is different in the two models even in the same velocity profile. Because the fluctuation of roughness length z0 is remarkable when determining by single velocity profile, some studies thought that the variation of roughness length was small between adjacent time when the change of topography was less obviously. Therefore, the measured data is divided into several sections by one day or a tidal cycle to fit the velocity profile of every section to obtain a roughness length z0, i.e., the roughness length z0 varies only after a day or a tidal cycle. The purpose of the paper is to expand the log-linear model to full depth by adding the surface boundary condition ∂u∂zz=D=0(Diswaterdepth) and to discuss the difference when 6 points (bottom layer, 0.2D, 0.4D, 0.6D, 0.8D, surface layer) velocity profile are fitted by logarithmic model, log-linear model, and extended log-linear model with the same roughness length z0 in different time section, respectively. The calculated friction velocity and friction coefficient and their correlation are discussed. The results show that the log-linear model and the log-linear extend model are closer to the measure velocity profile than that of the logarithmic model.

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Yao, Juntian, Kanmin Shen, Kuanjun Wang, Jian Yu, and Maosong Huang. "Experimental and Numerical Studies on the Axial Bearing Behaviour of a Pile Due to Relevant Foundation Fill Material on the Coastal Tidal Flat." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-79769.

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Abstract The control centers of wind power plants are usually located in coastal tidal flat areas. To ensure the design elevation of the control centres is maintained above the water table, a thick fill will be placed on the original ground level. However, the filling would cause a long-term ground settlement and further lead to the development of the NSF (short for negative skin friction) of the pile foundations for the control centers. In this study, a series of full-scale axial compressive tests were conducted to investigate the effect of fills on the pile bearing behaviour. The numerical analysis method is also established to study the influence of additional ground pressures on the pile axial bearing behavior over time and the influence of NSF caused by consolidation on pile bearing capacity. The rationality is verified by comparisons with the full-scale tests. Finally, a simple procedure is further employed to study the evolution of the long-term pile bearing behavior.

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