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Academic literature on the topic 'Tidal fluctuation'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Tidal fluctuation"

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Makokha, Mary, Akira Kobayashi, and Shigeyasu Aoyama. "Effect of Tidal Fluctuation on Velocity Distribution in Coastal Aquifers." Journal of Rainwater Catchment Systems 13, no. 2 (2008): 1–6. http://dx.doi.org/10.7132/jrcsa.kj00004871194.

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Li, Yutao, Bin Zhang, Lei Shi, and Yiwei Ye. "Dynamic Variation Characteristics of Seawater Intrusion in Underground Water-Sealed Oil Storage Cavern under Island Tidal Environment." Water 11, no. 1 (January 12, 2019): 130. http://dx.doi.org/10.3390/w11010130.

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In the case of constructing underground water-sealed oil storage caverns in island environments, the groundwater seepage characteristics are more complicated under the influence of seawater and tidal fluctuations. It also faces problems such as seawater intrusion. This research is based on multi-physical field coupling theory and analyzed the influence of tidal fluctuation and water curtain systems on the temporal-spatial variations of seawater intrusion in an island oil storage cavern in China using the finite element method. The results show that the operation of an underground water-sealed oil storage cavern in an island environment has a risk of inducing seawater intrusion. The tidal fluctuation has a certain degree of influence on the seepage field of the island. The water curtain system can decrease seawater intrusion and reduce the influence of tidal fluctuation on the seepage field inside the island. The research results provide a theoretical basis for the study of seawater intrusion in underground oil storage caverns under island tidal environments.
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Zhang, Cun Yong. "Non-Tidal Water Level Variability in Lianyungang Coastal Area." Advanced Materials Research 610-613 (December 2012): 2705–8. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.2705.

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The non-tidal water level fluctuation at four locations in Lianyungang coastal area was analyzed by using tide data. Results show that the non-tidal water level fluctuation was associated with the spatial distribution. The combined effects of shoaling and attenuation due to the shape and bottom topography contribute to the spatial distribution of non-tidal water level fluctuation. Two characteristic oscillation periods of about 12 h and 24 h which highly coherent throughout the four stations were revealed. Analysis of the exciting mechanisms indicates that the variability was mainly generated by fluctuation in wind speed.
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Cernelc, Mateja, Béla Suki, Benjamin Reinmann, Graham L. Hall, and Urs Frey. "Correlation properties of tidal volume and end-tidal O2 and CO2 concentrations in healthy infants." Journal of Applied Physiology 92, no. 5 (May 1, 2002): 1817–27. http://dx.doi.org/10.1152/japplphysiol.00675.2001.

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We investigated whether breath-to-breath fluctuations in tidal volume (Vt) and end-tidal O2 and CO2exhibit long-range correlations and whether parameters describing the correlations can be used as noninvasive descriptors of control of breathing. We measured Vt and end-tidal O2 and CO2 over n = 352 ± 104 breaths in 26 term, healthy, unsedated infants (mean age ± SD: 36 ± 6 days) and calculated the detrended fluctuation function [F( n)]. The F( n) of the breath-to-breath time series of Vt, O2, and CO2 revealed a linear increase with a breath number on log-log plots with a slope that was significantly different from 0.5 (random) and thus consistent with scale-invariant behavior. Long-range correlations were stronger for O2 than for Vt and CO2. The F( n) of many individual signals exhibited a crossover behavior indicating that control mechanisms regulating fluctuations of Vt, O2, and CO2 may be different on different time scales. Thus breathing has a memory up to at least 400 breaths that can be characterized by the simple indicator α.
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Song, Zongzhong, Hailong Li, Qian Ma, Chunmiao Zheng, Jiu Jimmy Jiao, and Shaohong Li. "Analytical Solution of Tidal Loading Effect in a Submarine Leaky Confined Aquifer System." Geofluids 2019 (June 20, 2019): 1–15. http://dx.doi.org/10.1155/2019/8017164.

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Although there are many existing analytical studies of tidal groundwater level fluctuations in coastal aquifer systems, few of them focus on an offshore submarine aquifer. Here, we consider tidal groundwater head fluctuations in a submarine leaky confined aquifer overlain by a semipermeable seabed. Both the seabed and the confined aquifer are assumed to extend horizontally infinitely. A one-dimensional mathematical model is established to describe the problem, and the analytical solution is derived. The impacts of the tidal loading efficiency, hydraulic conductivity and elastic storage of the semipermeable layer and aquifer on the groundwater head fluctuations in the aquifer system are analyzed and discussed. Solution analyses indicated that tidal loading effects tend to enhance the amplitude of the tidal groundwater fluctuation in the confined aquifer system and to reduce the phase shift between the groundwater head and the sea tide fluctuations.
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Wang, Shu-qi, Ying Zhang, Yang-yang Xie, Gang Xu, Kun Liu, and Yuan Zheng. "Hydrodynamic Analysis of Horizontal Axis Tidal Current Turbine under the Wave-Current Condition." Journal of Marine Science and Engineering 8, no. 8 (July 26, 2020): 562. http://dx.doi.org/10.3390/jmse8080562.

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To take advantage of the high tidal current velocity near the free surface, the horizontal axis turbine is installed, which inevitably causes hydrodynamic characteristics to effect the turbine by the waves. In this article, we established a numerical calculation method for the hydrodynamic load of a horizontal axis turbine under wave-current conditions. Based on the numerical calculation results, the hydrodynamic loads were decomposed and the influence rules of wave parameters and blade tip immersion depth on the hydrodynamic load were obtained. The study found the following: (1) the multi-frequency fluctuations based on the rotation frequency and incident wave frequency occurred in instantaneous values of the axial load coefficients and energy utilization ratios, and the fluctuation amplitude decreased with the increase of the blade tip immersion depth; (2) the fluctuation amplitude, according to rotation frequency, changed less with the increase of wave period and wave height, and was smaller according to wave frequency; (3) the fluctuation amplitude based on wave frequency increased linearly with the increase of wave height and wave period. The research results can provide the basis and reference for the design and engineering application of tidal current power station.
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Yu, Hui, Qiang Li, Li Xin Wei, Zhong Kai Xiao, Shuang Cao, and Wei Guo Zhang. "The Pattern and Cause Analysis of Tidal Level Fluctuation of the Yangtze River in Nanjing Section." Applied Mechanics and Materials 641-642 (September 2014): 101–7. http://dx.doi.org/10.4028/www.scientific.net/amm.641-642.101.

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This paper used the Mann-Kendall test, Spearman rank correlation test, Pettitt-Mann-Whitney change-point statistics, and complex Morlet wavelet analysis method to analyze the trend, change-point, and period of the tidal level at Nanjing Station from 1950 to 2012. The results demonstrated that there was a significant increase of annual highest and lowest tidal levels, while the trend of annual average tidal level change was not obvious. Significant mutations existed not only in the term of annual highest tidal level but also in the lowest one: the annual highest tidal level increased by 0.49m after 1972, while the annual lowest one increased by 0.29m after 1982. The period of annual average tidal level, highest one, and lowest one were 10 years, 15 years, and 14 years respectively. The scale of fluctuations in the annual highest tidal level was close to the annual lowest tidal level. The cause analysis of fluctuation indicated that runoff variation was the dominant factor of tidal level change.
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Yusran, Fadly Hairannoor. "Relationship between Organic-C and Available-P Due to Tidal Fluctuation in South Kalimantan." Journal of Tropical Soils 17, no. 3 (January 25, 2013): 253–57. http://dx.doi.org/10.5400/jts.2012.v17i3.253-257.

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Tidal fluctuation creates different soil chemical properties which is totally deviate from normal circumstances. Organic matter decomposition occurs with limited O2 supply, hence disturbing Carbon cycle which has a central role in the process and nutrient mineralisation. The research aimed was to describe the relationship between organic-C and available-P due to tidal fluctuation in South Kalimantan. Ten undisturbed composite samples were collected in top-soil and sub-soil. Results showed that there was no direct effect from organic-C in P availability as in other mineral soils. However, there was an indication that the relationship was influenced by maturing process of the soil. In other words, the relationship between organic-C and available-P was typical for every type of swampland and was not related to the tidal fluctuationKeywords: Available-P, organic-C, P-transformation, tidal water fluctuation [How to Cite: Yusran FH. 2012. Relationship between Organic-C and Available-P Due to Tidal Fluctuation in South Kalimantan. J Trop Soils 17 (3) : 253-257. doi: 10.5400/jts.2012.17.3.253] [Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.253]
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Lu, Zu-Jia, Da-Bin Lin, Ling-Hua Xie, and En-Wei Liang. "Variability in the light curve of tidal disruption events." Proceedings of the International Astronomical Union 11, S319 (August 2015): 137. http://dx.doi.org/10.1017/s1743921315010200.

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The X-ray light curve of Sw~J1644+57 indicates this event would be due to a tidal disruption. The lightcurve shows large amplitude fluctuation. As proposed by Lyubarskii (1997), the aperiodic variability observed in the Galactic X-ray binaries and active galactic nuclei is likely from the fluctuation of the viscous parameter in their disks. We explain the significant fluctuation of the late X-ray lightcurve (t>106 seconds) of Sw J1644+57 with this model. We assume the stochastic variations in the viscous parameter featuring as α(R,t) = α0 [1+β(R,t)], where the time-scale for varying β(R,t) is set as ten times of the dynamic time-scale for disk at the radius R (Janiuk & Misra 2012). Based on the simulation results of Lodato et al. (2009), we describe the fallback behavior of the tidal disruption as Ṁfb ∝ {[(t - tb)/tfb]κ n + [(t - tb)/tfb]5n/3}−1/n for t > tb and Ṁfb=0 for other situations, where κ=10.0, n=0.5, tfb=103τ, and tb=102τ in which τ=2π(Rf3/GMBH)1/2 and Rf=5rg is the pericentre distance. Figure 1 compare the power-density spectra (PDS) derived from the observed and our simulated lightcurves. It is found the our simulations are well consistent with the observations.
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Garcia Novo, Patxi, Yusaku Kyozuka, and Maria Jose Ginzo Villamayor. "Evaluation of turbulence-related high-frequency tidal current velocity fluctuation." Renewable Energy 139 (August 2019): 313–25. http://dx.doi.org/10.1016/j.renene.2019.02.035.

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Dissertations / Theses on the topic "Tidal fluctuation"

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Teo, Hhih-Ting, and h. teo@griffith edu au. "Tidal Dynamics in Coastal Aquifers." Griffith University. School of Engineering, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20030729.155028.

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The prediction of coastal groundwater movement is necessary in coastal management. However, the study in this field is still a great challenge due to the involvement of tidal-groundwater interactions and the phenomena of hydrodynamic dispersion between salt-fresh water in the coastal region. To date, numerous theories for groundwater dynamic have been made available in analytical, numerical and also experimental forms. Nevertheless, most of them are based on the zeroth-order shallow flow, i.e. Boussinesq approximation. Two main components for coastal unconfined aquifer have been completed in this Thesis: the vertical beach model and the sloping beach model. Both solutions are solved in closed-form up to higher order with shallow water parameter ([epsilon]) and tidal amplitude parameter ([alpha]). The vertical beach solution contributes to the higher-order tidal fluctuations while the sloping beach model overcomes the shortcomings in the existing solutions. From this study, higher-order components are found to be significant especially for larger value of [alpha] and [epsilon]. Other parameters such as hydraulic conductivity (K) and the thickness of aquifer (D) also affect the water table fluctuations. The new sloping solution demonstrated the significant influence of beach slope ([beta]) on the water table fluctuations. A comprehensive comparison between previous solution and the present sloping solution have been performed mathematically and numerically and the present solution has been demonstrated to provide a better prediction
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Teo, Hhih-Ting. "Tidal Dynamics in Coastal Aquifers." Thesis, Griffith University, 2003. http://hdl.handle.net/10072/365678.

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The prediction of coastal groundwater movement is necessary in coastal management. However, the study in this field is still a great challenge due to the involvement of tidal-groundwater interactions and the phenomena of hydrodynamic dispersion between salt-fresh water in the coastal region. To date, numerous theories for groundwater dynamic have been made available in analytical, numerical and also experimental forms. Nevertheless, most of them are based on the zeroth-order shallow flow, i.e. Boussinesq approximation. Two main components for coastal unconfined aquifer have been completed in this Thesis: the vertical beach model and the sloping beach model. Both solutions are solved in closed-form up to higher order with shallow water parameter ([epsilon]) and tidal amplitude parameter ([alpha]). The vertical beach solution contributes to the higher-order tidal fluctuations while the sloping beach model overcomes the shortcomings in the existing solutions. From this study, higher-order components are found to be significant especially for larger value of [alpha] and [epsilon]. Other parameters such as hydraulic conductivity (K) and the thickness of aquifer (D) also affect the water table fluctuations. The new sloping solution demonstrated the significant influence of beach slope ([beta]) on the water table fluctuations. A comprehensive comparison between previous solution and the present sloping solution have been performed mathematically and numerically and the present solution has been demonstrated to provide a better prediction
Thesis (Masters)
Master of Philosophy (MPhil)
School of Engineering
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Güldner, Andreas, Robert Huhle, Alessandro Beda, Thomas Kiss, Thomas Bluth, Ines Rentzsch, Sarah Kerber, et al. "Periodic Fluctuation of Tidal Volumes Further Improves Variable Ventilation in Experimental Acute Respiratory Distress Syndrome." Frontiers Research Foundation, 2018. https://tud.qucosa.de/id/qucosa%3A32492.

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In experimental acute respiratory distress syndrome (ARDS), random variation of tidal volumes (VT ) during volume controlled ventilation improves gas exchange and respiratory system mechanics (so-called stochastic resonance hypothesis). It is unknown whether those positive effects may be further enhanced by periodic VT fluctuation at distinct frequencies, also known as deterministic frequency resonance.We hypothesized that the positive effects of variable ventilation on lung functionmay be further amplified by periodic VT fluctuation at specific frequencies. In anesthetized and mechanically ventilated pigs, severe ARDS was induced by saline lung lavage and injurious VT (double-hit model). Animals were then randomly assigned to 6 h of protective ventilation with one of four VT patterns: (1) random variation of VT (WN); (2) P04, main VT frequency of 0.13Hz; (3) P10, main VT frequency of 0.05Hz; (4) VCV, conventional non-variable volume controlled ventilation. In groups with variable VT , the coefficient of variation was identical (30%). We assessed lung mechanics and gas exchange, and determined lung histology and inflammation. Compared to VCV, WN, P04, and P10 resulted in lower respiratory system elastance (63 ± 13 cm H2O/L vs. 50 ± 14 cm H2O/L, 48.4 ± 21 cm H2O/L, and 45.1 ± 5.9 cm H2O/L respectively, P < 0.05 all), but only P10 improved PaO2/FIO2 after 6 h of ventilation (318 ± 96 vs. 445 ± 110mm Hg, P < 0.05). Cycle-by-cycle analysis of lung mechanics suggested intertidal recruitment/de-recruitment in P10. Lung histologic damage and inflammation did not differ among groups. In this experimental model of severe ARDS, periodic VT fluctuation at a frequency of 0.05Hz improved oxygenation during variable ventilation, suggesting that deterministic resonance adds further benefit to variable ventilation.
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Chen, Hua. "Investigation of Contaminant Transport in Tidally-Influenced Aquifers: Experiment and Analysis." ScholarWorks @ UVM, 2010. http://scholarworks.uvm.edu/graddis/43.

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Tidally-induced head fluctuation is a natural phenomenon in coastal regions. The discharge of groundwater through sediments will occur anywhere that the aquifer is hydraulically connected to a surface water body and the time averaged tidally-influenced water level in the aquifer is higher than sea level, and almost all coastal regions are subject to such flow. With the development of coastal areas, the discharge of groundwater contaminants into tidally affected coastal water bodies has become a significant problem. Biota that live in the benthic region are known to be sensitive to the concentration of discharging anthropogenic chemical compounds. Thus the contaminant concentration entering the benthos is of very significant practical importance and its study is the focus of this dissertation. An investigation of the effect of tides on the concentration of groundwater contaminants discharging to a surface water body is studied using a one-dimensional homogeneous sand column. Results of the experiment are confirmed using a three-dimensional heterogeneous groundwater tank model. A constant water level is imposed upgradient, and the downgradient water level is controlled by a wave generator that controls the hydraulic head to mimic a 12 hour tidal fluctuation. The experimental results demonstrate that the tidal fluctuations in the downgradient reservoir result in a decrease in average contaminant concentration at the point of groundwater discharge to the surface-water body. The further upstream the well is located, the smaller the amplitude of the concentration oscillation. In addition, upstream migration of concentration oscillations is observed in spite of a net downgradient flow. Fourier analysis suggests that the dominant frequency of the peaks of pressure and chemical data at different locations along the length of the column is identically two cycles per day and that the amplitudes of the concentration oscillations increase with time at measurement locations at the upstream responding probes. As the classical groundwater flow and transport model cannot reproduce the phenomena we observed, an innovative multi-mobility model, is proposed with one highly mobile liquid phase, one less mobile liquid phase and a solid phase. Averaging theory is applied to develop the mass conservation equation from the microscale to the macroscale and facilitate the reduction of dimensionality to obtain one-dimensional governing equations with closure relations. A new finite volume method is utilized to solve the resulting equations. The simulation confirms the existence of the enhanced tidally-induced mixing process.
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Guo, Haipeng, and 郭海朋. "Groundwater movement and subsurface air flow induced by land reclamation and tidal fluctuation in coastal aquifers." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40987735.

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Guo, Haipeng. "Groundwater movement and subsurface air flow induced by land reclamation and tidal fluctuation in coastal aquifers." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B40987735.

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Tucker, Nicole M. "Analyzing Tidal Fluctuations in the Big Pine Key Freshwater Lens with Time-Lapse Resistivity." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/947.

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The tidal influence on the Big Pine Key saltwater/freshwater interface was analyzed using time-lapse electrical resistivity imaging and shallow well measurements. The transition zone at the saltwater/freshwater interface was measured over part of a tidal cycle along three profiles. The resistivity was converted to salinity by deriving a formation factor for the Miami Oolite. A SEAWAT model was created to attempt to recreate the field measurements and test previously established hydrogeologic parameters. The results imply that the tide only affects the groundwater within 20 to 30 m of the coast. The effect is small and caused by flooding from the high tide. The low relief of the island means this effect is very sensitive to small changes in the magnitude. The SEAWAT model proved to be insufficient in modeling this effect. The study suggests that the extent of flooding is the largest influence on the salinity of the groundwater.
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Mansouri, Nahla. "Modélisation multidimensionnelle des pressions et teneurs en eau dans le sol et le sous-sol : effets capillaires et gravitaires en présence d'hétérogénéités et de fluctuations." Thesis, Toulouse, INPT, 2016. http://www.theses.fr/2016INPT0060/document.

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Cette recherche doctorale porte sur la modélisation 3D de la dynamique des teneurs en eau dans le sol et le soussol lorsque les écoulements sont à saturation variable. La modélisation est basée sur une version généralisée de la loi de Darcy-Buckingham et de l’équation de Richards multidimensionnelle. Les recherches présentées dans cette thèse concernent différents volets, présentés ci-dessous, dont le fil conducteur est l’analyse de phénomènes d’écoulements en milieux poreux, contenant de fortes hétérogénéités et/ou perturbés par des fluctuations temporelles. Dans le cadre d’un partenariat de recherche entre l’IMFT et l'IRSN sur la problématique du stockage souterrain de déchets radioactifs, nous avons modélisé en 3D la dynamique du front de désaturation d’une couche argileuse autour d’une galerie souterraine ventilée, à l’aide du code volumes finis BIGFLOW 3D. Ce travail a permis de mettre au point une approche d’immersion pour la modélisation des écoulements en milieux composites. Un autre volet de cette thèse concerne une étude analytique et numérique des profils verticaux de succion et de teneur en eau lors d’une infiltration verticale, non-saturante, dans un sol hétérogène finement stratifié. Des solutions analytiques exactes et approchées sont obtenues en régime permanent, à l’aide de transformations de variables, et sont comparées avec des solutions numériques pour différents degrés d’hétérogénéité. De même, les phénomènes de « barrière capillaire » sont étudiés d’une part analytiquement et d’autre part, par expérimentations numériques transitoires d’infiltration sur des systèmes bicouches, en présence d’une nappe plus ou moins profonde. D’autre part, les écoulements nonsaturés sont étudiés, cette fois, en présence d’un forçage transitoire fortement oscillatoire, dans une colonne de sable fin homogène, sous l’effet de fluctuations périodiques du niveau de la surface libre. Une méthode multi-front mise au point lors d’une thèse précédente à l’IMFT est validée numériquement en montrant que cette méthode simule efficacement la dynamique oscillatoire des flux et des profils de pression avec un nombre limité de « fronts ». De plus, nous avons analysé la phénoménologie capillaire/gravitaire des écoulements oscillatoires dans la colonne grâce à un suivi dynamique du plan de flux nul. Enfin, nous présentons, comme extension aux travaux précédents, une étude préliminaire des phénomènes 3D d’infiltration et de redistribution d’eau, notamment lorsque l’hétérogénéité du sol est de type aléatoire. Les premiers essais d’infiltration permettent de tester, en réplique unique, des méthodes de prises de moyennes spatiales des champs de succion et teneur en eau et évaluer la taille minimum du domaine de calcul 3D permettant d’obtenir des profils verticaux moyens représentatifs de l’infiltration dans une réplique unique du sol aléatoire
This doctoral research, defended at the Institut de Mécanique des Fluides de Toulouse, is devoted to modeling water pressure and water content in soils and in subsurface geologic formations, in the case of variably saturated flow. One of the main scientific objectives of this work is to analyze the response of unsaturated flow systems, and particularly capillary and gravitational effects, in the presence of material heterogeneities, discontinuities, and/or space-time fluctuations. Modeling is based on a generalized version of Darcy- Buckingham’s law, and of Richards’ flow equation. Overall, the topics developed in this PhD thesis focus on several related aspects of variably saturated water flow in the subsurface. These aspects all occur at once in most applications (drying/wetting,heterogeneity, temporal forcing), but they are "decoupled" here for convenience. A preliminary research (collaborative project IMFT / IRSN) was developed to study the 2D/3D drying process at the porous wall of a deep cylindrical excavation in response to hydrometeorological signals. This project has motivated the design and testing of a novel approach to include cavities in the modeling domain. A detailed study of steady state infiltration was developed for the case of finely stratified soils, with parameters that vary continuously and cyclically with depth. Exact and approximate analytical solutions are calculated based on variable transformation methods and on perturbation type approximations, and they are tested numerically using a finite volume code (BIGFLOW 3D). The sensitivity of suction fluctuations vs. stratification wavelength is investigated, as well as the effect of the degree of heterogeneity, and of water table depth. Capillary barrier effects are studied for the case of unsaturated infiltration in multilayer soil systems characterized by a discontinuity of soil properties at interfaces. Numerical experiments are developed for transient infiltration towards a water table through a two-layer system, the goal being to analyze possible capillary barrier effects under various scenarios. On the other hand, we study numerically the case of a partially saturated / unsaturated soil column submitted to highly variable oscillatory pressure at the bottom of the column: this leads to vertical flow oscillations in the unsaturated zone above the water table influenced by tides (coastal beach sand). We analyze the dynamics of this oscillatory flow, where capillary and gravitational effects compete; for this purpose we use a novel method that tracks the positions of the zero flux plane in the unsaturated column. Finally, we also present, as an extension to the previous studies, a preliminary investigation of multidimensional infiltration/redistribution phenomena, particularly for the case of fully 3D random-type soil heterogeneity. The first numerical experiments of 3D infiltration are undertaken based on the single realization approach to soil heterogeneity, and assuming a uniform distribution of wetting at soil surface
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Han, Q., D. Chen, Yakun Guo, and W. Hu. "Saltwater-freshwater mixing fluctuation in shallow beach aquifers." 2018. http://hdl.handle.net/10454/15542.

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Yes
Field measurements and numerical simulations demonstrate the existence of an upper saline plume in tidally dominated beaches. The effect of tides on the saltwater-freshwater mixing occurring at both the upper saline plume and lower salt wedge is well understood. However, it is poorly understood whether the tidal driven force acts equally on the mixing behaviours of above two regions and what factors control the mixing fluctuation features. In this study, variable-density, saturated-unsaturated, transient groundwater flow and solute transport numerical models are proposed and performed for saltwater-freshwater mixing subject to tidal forcing on a sloping beach. A range of tidal amplitude, fresh groundwater flux, hydraulic conductivity, beach slope and dispersivity anisotropy are simulated. Based on time sequential salinity data, the gross mixing features are quantified by computing the spatial moments in three different aspects, namely, the centre point, length and width, and the volume (or area in a two-dimensional case). Simulated salinity distribution varies significantly at saltwater-freshwater interfaces. Mixing characteristics of the upper saline plume greatly differ from those in the salt wedge for both the transient and quasi-steady state. The mixing of the upper saline plume largely inherits the fluctuation characteristics of the sea tide in both the transverse and longitudinal directions when the quasi-steady state is reached. On the other hand, the mixing in the salt wedge is relatively steady and shows little fluctuation. The normalized mixing width and length, mixing volume and the fluctuation amplitude of the mass centre in the upper saline plume are, in general, one-magnitude-order larger than those in the salt wedge region. In the longitudinal direction, tidal amplitude, fresh groundwater flux, hydraulic conductivity and beach slope are significant control factors of fluctuation amplitude. In the transverse direction, tidal amplitude and beach slope are the main control parameters. Very small dispersivity anisotropy (e.g., α_L⁄α_T <5) could greatly suppress mixing fluctuation in the longitudinal direction. This work underlines the close connection between the sea tides and the upper saline plume in the aspect of mixing, thereby enhancing understanding of the interplay between tidal oscillations and mixing mechanisms in tidally dominated sloping beach systems.
Shenzhen Key Laboratory for Coastal Ocean Dynamics and Environment (No. ZDSY20130402163735964), National High Technology Research & Development Program of China (No. 2012AA09A409).
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Shiau, Huei-Ru, and 蕭惠如. "The Fluctuations of Water Level in Coastal AquifersInduced by Tidal Waves." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/58737494620849341799.

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碩士
國立中興大學
水土保持學系所
101
Tide-induced water table fluctuations in coastal aquifers have a great impact on biological activities, chemical transformations and coastal sediment erosions. The data of groundwater level changes are usually obtained by the groundwater observation wells. It is not easy to dig wells in the steep terrain or remote areas and also it costs a lot. Understanding water table fluctuations in coastal aquifers can provide the correct prediction and management. The Boussinesq equation is usually employed to govern the flow in coastal aquifers. The traditional Boussinesq equation supposes that the impervious bed is flat. Before this study, there are a number of scholars using this equation to deduce analytical solutions of different stratigraphic situations. (e.g., the problem of inclined coastal slope, the leakage phenomenon of aquifers). Impervious beds within the coastal aquifers may be inclined because of squeezing ground. For this phenomenon, the study employed the Chapman’s (1980) modified Boussinesq equation to govern the flow in coastal aquifers and solved it by the perturbation method. Then, second-order nonlinear solutions were obtained. This study added the change of the inclined angle of the impervious bed,and then the groundwater level fluctuations varying with time and space in different slopes angle and impervious bed angles were discussed. When the impervious bed is flat, this study compared with the previous nalytical solutions and the indoor experimental data, the results are in a good agreement. With the change of impermeable bed angle, the larger the inclined angle, the larger the downward vibration of groundwater level. But the downstream groundwater level will gradually become smaller. It is also found that if the impervious bed slopes downward, the inclined angle between -25 ° ~ -35 °, the downstream groundwater level will first rise and then descend. As to the two-dimensional analytical solutions, the impact of river water level fluctuations was investigated. When the impervious bed slopes upward, the angle greater than 10 °, it will increase the frequency of groundwater level fluctuations. When the impervious bed slopes downward, the influence of the river water level fluctuations will increase the downward vibration of groundwater level, but the downstream groundwater level will decrease.
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Books on the topic "Tidal fluctuation"

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Groth, Charlie. Another Haul. University Press of Mississippi, 2019. http://dx.doi.org/10.14325/mississippi/9781496820365.001.0001.

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When people cross the footbridge to Lewis Island in the Delaware River at Lambertville, NJ, they’re in a “whole ‘nother world”: wild and civilized, stable atop changing water and earth. Here lies the last commercial haul seine fishery on the non-tidal Delaware, where Lewis family members have netted since 1888 and have long monitored the fluctuating shad population. The island also serves as a spiritual, recreational, and community site for local and regional visitors, whom the Lewis family welcomes because of their forebear’s “mandate to share the island.” Visitors feel almost immediately that this place is special, but the why is elusive. Folklorist Charlie Groth explains Lewis Island’s unassuming cultural magic by developing the concept of “narrative stewardship,” a practice by which people take care of communal resources (in this case, river, shad, tradition, and community itself) through sharing stories. Anchored in over two decades of field research, this accessible ethnography interweaves the author’s observations as a crew member, stories from various tellers, interviews, history, and cultural theory. Beginning with thick description, the work explores four broad story types—Big Stories, character anecdotes, microlegends, and everyday storying. Groth traces how narratives intertwine with each other and with the physical environment to create sense of place, while participants in various roles navigate belonging. Ultimately, she posits the idea that in an era when telectronics have changed material conditions profoundly and quickly, echoing the way the industrial revolution led to anomie, narrative stewardship embedded in everyday life helps sustain culture and community.
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Book chapters on the topic "Tidal fluctuation"

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Tung, Smita, Sibapriya Mukherjee, and Gupinath Bhandari. "Stability of Earthen Embankment with Clay Core Under Tidal Fluctuation." In Lecture Notes in Civil Engineering, 199–207. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0368-5_22.

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Ramos-Guajardo, Ana Belén, and Gil González-Rodríguez. "Testing the Variability of Interval Data: An Application to Tidal Fluctuation." In Towards Advanced Data Analysis by Combining Soft Computing and Statistics, 65–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-30278-7_6.

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Rahman, Mohammad Lutfur, Shunsuke Oka, and Yasuyuki Shirai. "Hybrid Offshore Wind and Tidal Turbine Power System to Compensate for Fluctuation (HOTCF)." In Zero-Carbon Energy Kyoto 2010, 177–86. Tokyo: Springer Japan, 2011. http://dx.doi.org/10.1007/978-4-431-53910-0_24.

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Wilson, Curtis. "Tidal Acceleration, Fluctuations, and the Earth’s Variable Rotation, to 1939." In The Hill-Brown Theory of the Moon’s Motion, 239–84. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-5937-9_22.

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Mathis, Romain, Ivan Marusic, Olivier Cabrit, Nicole L. Jones, and Gregory N. Ivey. "Reconstruction of Wall Shear-Stress Fluctuations in a Shallow Tidal River." In Progress in Wall Turbulence 2, 247–57. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20388-1_22.

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Swenson, E. M., and C. E. Sasser. "Water level fluctuations in the Atchafalaya Delta, Louisiana: tidal forcing versus river forcing." In Dynamics and Exchanges in Estuaries and the Coastal Zone, 191–208. Washington, D. C.: American Geophysical Union, 1992. http://dx.doi.org/10.1029/ce040p0191.

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Beukema, J. J., and K. Essink. "Common patterns in the fluctuations of macrozoobenthic species living at different places on tidal flats in the Wadden Sea." In Long-Term Changes in Coastal Benthic Communities, 199–207. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-4049-9_18.

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Burns, Alison. "The Mesolithic Footprints Retained in One Bed of the Former Saltmarshes at Formby Point, Sefton Coast, North West England." In Reading Prehistoric Human Tracks, 295–315. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-60406-6_16.

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AbstractIn the early Holocene period, extensive tracts of coastal land were submerged as the climate warmed and meltwaters flooded into the oceans. As the Irish Sea expanded, coastlines altered and large intertidal zones were created as tracts of low-lying land at the tidal margins were gradually submerged. In these areas, reed swamp and saltmarsh formed which, too, were inundated for varying periods of time. However, in the calmer warmer weather of the late spring and summer, birds and mammals were drawn on to the mudflats where they could feed on molluscs, or new reed and sedge shoots, wallow in the cooling mud, drink the brackish water or, for some predators, hunt. The behavioural tendencies of some species are revealed by their footprints which show their engagement within this environment – some breeds moved on to the marshes while others moved away. The humans who shared this landscape understood the opportunities offered by these predictable behaviours. Their trails run along and across those left by many species, leaving a visible network of human and animal activity preserved in the hardened mud. These will be described through an examination of the footprints recorded in three contexts which formed the stratigraphy of a Mesolithic bed at Formby Point in North West England. The persistent return to the mudflats by generations of people reflects an embodied knowledge of this coastal landscape, learnt in childhood and practiced in adulthood. The ability to modify movements in the landscape, to respond to the daily tides, the changing seasons and a fluctuating environment, all suggest a spatial-temporal relationship which not only encompassed a dynamic environment but also the other life that dwelt within it.
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"tidal fluctuation." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1395. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_201168.

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Chen, Ping, Ta-Kang Liu, Jin-Li Yu, Ruey-Chy Kao, and Hwung-Hweng Hwung. "Fluctuation of nearshore water quality during a tidal cycle in Yunlin County." In Environmental Hydraulics and Sustainable Water Management, Two Volume Set, 771–77. CRC Press, 2004. http://dx.doi.org/10.1201/b16814-126.

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Conference papers on the topic "Tidal fluctuation"

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Hyunman Lee and JeongJae Lee. "Reliability Analysis of the sluice Gate by the Tidal Fluctuation." In 2013 Kansas City, Missouri, July 21 - July 24, 2013. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2013. http://dx.doi.org/10.13031/aim.20131620235.

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Jye, Lee Lin, Shenbaga R. Kaniraj, and Siti Noor Linda Taib. "Effect of Tidal Fluctuation on Ground Movement and Pore Water Pressure." In Geo-Shanghai 2014. Reston, VA: American Society of Civil Engineers, 2014. http://dx.doi.org/10.1061/9780784413449.004.

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Harding, Samuel F., and Ian G. Bryden. "Development of Fixed Hydrodynamic Lifting Surfaces to Stabilise Anchoring Structures in Energetic Tidal Flows." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83392.

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This paper presents the research currently being carried out on the potential contribution of hydrofoils to generate additional down-force on seabed fastenings in energetic tidal flows. Firstly, the dynamic lift of a hydrofoil subjected to vertical velocity perturbations was analyzed numerically, showing the reduced response to the fluctuation when unsteady aerodynamic theories are introduced. Secondly, an experimental set-up was developed for the deterministic generation of two-dimension velocity perturbations in a recirculating water flume. This will allow the combined effect of vertical and longitudinal velocity fluctuations on the lift force to be measured.
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Kong, Jun, and Zhiyao Song. "Numerical Study on the Wind Drag Stress in Storm Surge." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29145.

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In estuary and coastal areas the storm surge will usually occur in typhoon season. When simulating the storm surge by numerical model, the wind speed at the height of 10m above the mean sea level will be usually used. Determining the wind drag stress on free surface reasonably plays an important role to simulate the storm surge accurately. In the past numerical models, the wind drag stress on free surface was calculated only considering the relative wind speed. There are many formulas about wind stress can be used, whereas these formulas are usually got in laboratory, where the water surface fluctuates in a small range, and the water elevation itself has not been considered in formula. Actually in some place, the astronomical tidal range is large, such as Yangtze estuary and Hangzhou bay in China, and during typhoon season, the water fluctuation range is much larger than ever there. In conventional method the wind stress will be underestimate in flood tide and be over-valuated in ebb tide without considering the fluctuation of water, so it is obviously unsuitable to take no account of the influence of tidal level on wind stress. Therefore in the intensive tide coastal area, the relationship of the relative wind speed, tidal level should be considered together. A new kind of wind stress formula has been established in this paper and been adopted in simulating the storm surge of typhoon Winnie in Yangtze estuary, and the results are better and satisfying.
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Hu, Ende, Zheng Wang, Haibo Zhao, Jing Guo, and Huan Yang. "A novel control strategy to smooth power fluctuation of hybrid offshore wind and tidal power generation system." In 2017 IEEE Conference on Energy Internet and Energy System Integration (EI2). IEEE, 2017. http://dx.doi.org/10.1109/ei2.2017.8245723.

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Lin, Wei, Xiongyao Xie, Pan Li, Bin Xiao, Xiaolong Lu, Bihong Feng, Jin Pan, and Yue Hu. "Prediction of Settlement Induced by Tidal Fluctuation for Underwater Shield Tunnel During Service Based on Historical Monitoring Data." In 2022 8th International Conference on Hydraulic and Civil Engineering: Deep Space Intelligent Development and Utilization Forum (ICHCE). IEEE, 2022. http://dx.doi.org/10.1109/ichce57331.2022.10042697.

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Imanudin, M. S., E. Armanto, R. H. Susant, and S. M. Bernas. "The study water table fluctuation in tidal lowland for developing agricultural water management strategies: (A case study for corn cultivation after rice)." In 2010 International Conference on Chemistry and Chemical Engineering (ICCCE). IEEE, 2010. http://dx.doi.org/10.1109/iccceng.2010.5560404.

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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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Thomas, Jonathan E., and Wilbur J. Morin. "Wharf Movements Due to Tidal Fluctuations." In Geo-Denver 2000. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40518(294)9.

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Sassa, Shinji, Fengying Li, and Hideo Sekiguchi. "Response of Saturated/Unsaturated Gravelly Sand to Tidal Fluctuations." In First Japan-U.S. Workshop on Testing, Modeling, and Simulation. Reston, VA: American Society of Civil Engineers, 2005. http://dx.doi.org/10.1061/40797(172)9.

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