Artykuły w czasopismach: „Tidal fluctuation”

1

Makokha, Mary, Akira Kobayashi i Shigeyasu Aoyama. "Effect of Tidal Fluctuation on Velocity Distribution in Coastal Aquifers". Journal of Rainwater Catchment Systems 13, nr 2 (2008): 1–6. http://dx.doi.org/10.7132/jrcsa.kj00004871194.

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Li, Yutao, Bin Zhang, Lei Shi i Yiwei Ye. "Dynamic Variation Characteristics of Seawater Intrusion in Underground Water-Sealed Oil Storage Cavern under Island Tidal Environment". Water 11, nr 1 (12.01.2019): 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 (grudzień 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 i Urs Frey. "Correlation properties of tidal volume and end-tidal O2 and CO2 concentrations in healthy infants". Journal of Applied Physiology 92, nr 5 (1.05.2002): 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 i Shaohong Li. "Analytical Solution of Tidal Loading Effect in a Submarine Leaky Confined Aquifer System". Geofluids 2019 (20.06.2019): 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 i Yuan Zheng. "Hydrodynamic Analysis of Horizontal Axis Tidal Current Turbine under the Wave-Current Condition". Journal of Marine Science and Engineering 8, nr 8 (26.07.2020): 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 i 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 (wrzesień 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, nr 3 (25.01.2013): 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 i En-Wei Liang. "Variability in the light curve of tidal disruption events". Proceedings of the International Astronomical Union 11, S319 (sierpień 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 i Maria Jose Ginzo Villamayor. "Evaluation of turbulence-related high-frequency tidal current velocity fluctuation". Renewable Energy 139 (sierpień 2019): 313–25. http://dx.doi.org/10.1016/j.renene.2019.02.035.

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Guo, Haipeng, Jiu J. Jiao i Hailong Li. "Groundwater response to tidal fluctuation in a two-zone aquifer". Journal of Hydrology 381, nr 3-4 (luty 2010): 364–71. http://dx.doi.org/10.1016/j.jhydrol.2009.12.009.

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Cheong, C. J., i M. Okada. "Effects of spilled oil on the tidal flat ecosystem - evaluation of wave and tidal actions using a tidal flat simulator". Water Science and Technology 43, nr 2 (1.01.2001): 171–77. http://dx.doi.org/10.2166/wst.2001.0087.

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The purpose of this study is to clarify the effects of wave and tidal actions on the penetration of spilled oil stranded on tidal flats and to evaluate the influence of the penetrated oil on seawater infiltration using tidal flat simulator. A simulator used was composed of tidal flat, wave maker, tide controlling device, temperature controlling system and computer controlling system. The infiltrations of seawater and fuel oil C into tidal flats were visualized using transparent glass beads as tidal flat sediments. Penetration behaviour of the spilled oil into the sediments was significantly different from that of seawater. Seawater infiltrated into the sediments both by wave action and tidal fluctuation, while fuel oil C penetrated by tidal movement only. The infiltration of seawater was reduced by penetrated oil. This result indicates that the penetrated oil diminishes infiltration of seawater into the sediments and thus results in the reduction in the supply of oxygen, nutrients, and organic matterto the benthic organisms in tidal flat.

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13

Wen, Jet-Chau, Hong-Ru Lin, Tian-Chyi Jim Yeh, Yu-Li Wang, Keng-Li Lin i Shao-Yang Huang. "Hydraulic Tomography for Estimating the Diffusivity of Heterogeneous Aquifers Based on Groundwater Response to Tidal Fluctuation in an Artificial Island in Taiwan". Geofluids 2018 (2018): 1–15. http://dx.doi.org/10.1155/2018/6046258.

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This study investigated the hydraulic properties of the heterogeneous aquifers of an artificial island (Yunlin Offshore Industrial Park) in Taiwan. The research was based on the groundwater level response affected by tidal fluctuation using the hydraulic tomography (HT) to analyze the hydraulic diffusivity (α). Specifically, the power spectrum ratio of groundwater and tidal fluctuations derived from the Gelhar solution was used to estimate α in homogeneous aquifers; this, however, could not be applied in the artificial island. Next, the spatial distribution of the groundwater level response affected by tidal fluctuation was analyzed and found to be irregular, proving the existence of hydrogeological heterogeneity in the artificial island. Furthermore, the results of the estimated α using the HT showed low error and high correlation, 0.41 m2/hr and 0.83, respectively, between the optimal estimated heterogeneous and reference α fields in the synthetic aquifer. Last, the HT was used in the real tested scenario. By comparing the predicted groundwater levels of the optimal estimated heterogeneous α field and the observed groundwater levels of the real aquifer, it was found that the correlation was higher than 0.99. Therefore, the HT can be used to obtain the optimal estimated heterogeneous α field in the artificial island.

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Frey, Urs, Geoffrey Maksym i Béla Suki. "Temporal complexity in clinical manifestations of lung disease". Journal of Applied Physiology 110, nr 6 (czerwiec 2011): 1723–31. http://dx.doi.org/10.1152/japplphysiol.01297.2010.

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In this review, we summarize results of recent research on the temporal variability of lung function, symptoms, and inflammatory biomarkers. Specifically, we demonstrate how fluctuation analysis borrowed from statistical physics can be used to gain insight into neurorespiratory control and complex chronic dynamic diseases such as asthma viewed as a system of interacting components (e.g., inflammatory, immunological, and mechanical). Fluctuation analysis tools are based on quantifying the distribution and the short- and long-term temporal history of tidal breathing and lung function parameters to assess neurorespiratory control and monitor chronic disease. The latter includes the assessment of severity and disease control, the impact of treatment and environmental triggers, the temporal characterization of disease phenotypes, and the individual risk of exacerbation. While in many cases specific mechanistic insight into the fluctuations still awaits further research, appropriate analyses of the fluctuations already impact on clinical science and practice.

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15

Hsieh, Ping-Cheng, Hsiao-Ting Hsu, Ching Biao Liao i Pei-Te Chiueh. "Groundwater response to tidal fluctuation and rainfall in a coastal aquifer". Journal of Hydrology 521 (luty 2015): 132–40. http://dx.doi.org/10.1016/j.jhydrol.2014.11.069.

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Liu, Yi, Jiu Jimmy Jiao i Wenzhao Liang. "Tidal Fluctuation Influenced Physicochemical Parameter Dynamics in Coastal Groundwater Mixing Zone". Estuaries and Coasts 41, nr 4 (23.10.2017): 988–1001. http://dx.doi.org/10.1007/s12237-017-0335-x.

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Asadi-Aghbolaghi, Mahdi, Mo-Hsiung Chuang i Hund-Der Yeh. "Groundwater response to tidal fluctuation in a sloping leaky aquifer system". Applied Mathematical Modelling 36, nr 10 (październik 2012): 4750–59. http://dx.doi.org/10.1016/j.apm.2011.12.009.

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Pace, Francesco, i Carlo Schimd. "Tidal virialization of dark matter haloes with clustering dark energy". Journal of Cosmology and Astroparticle Physics 2022, nr 03 (1.03.2022): 014. http://dx.doi.org/10.1088/1475-7516/2022/03/014.

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Abstract We extend the analysis of Pace et al. [1] by considering the virialization process in the extended spherical collapse model for clustering dark-energy models, i.e., accounting for dark-energy fluctuations. Differently from the standard approach, here virialization is naturally achieved by properly modelling deviations from sphericity due to shear and rotation induced by tidal interactions. We investigate the time evolution of the virial overdensity Δvir in seven clustering dynamical dark energy models and compare the results to the ΛCDM model and to the corresponding smooth dark-energy models. Taking into account all the appropriate corrections, we deduce the abundance of convergence peaks for Rubin Observatory-LSST and Euclid-like weak-lensing surveys, of Sunyaev-Zel'dovich peaks for a Simon Observatory-like CMB survey, and of X-ray peaks for an eROSITA-like survey. Despite the tiny differences in Δvir between clustering and smooth dark-energy models, owing to the large volumes covered by these surveys, five out of seven clustering dark-energy models can be statistically distinguished from ΛCDM. The contribution of dark-energy fluctuation cannot be neglected, especially for the Chevallier-Polarski-Limber and Albrecht-Skordis models, provided the instrumental configurations provide high signal-to-noise ratio. These results are almost independent of the tidal virialization model.

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Yamagata, Shiro, Shouya Orishikise, Masaru Yamashiro, Yasuyuki Nakagawa, Noriaki Hashimoto, Hiroki Kukita i Hiromasa Igata. "NUMERICAL SIMULATIONS ON INFLUENCE OF LONG-TERM FLUCTUATION OF MEAN WATER LEVEL ON SAND WAVES IN THE KANMON WATERWAY, JAPAN". Coastal Engineering Proceedings, nr 36v (31.12.2020): 45. http://dx.doi.org/10.9753/icce.v36v.papers.45.

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In this study, the numerical simulation of tidal current and sediment transport in the Kanmon Waterway were performed by using a numerical simulation model FVCOM (Finite Volume Community Ocean Model (Chen et al. 2003)), in order to discuss the influence of the long-term fluctuation of mean water level on the sand waves. The numerical simulation results suggested that the spatial difference of the long-term fluctuation of mean water level in the Kanmon Straits slightly changes the tidal current around Tanoura Area, and consequently affects the development of sand waves.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/kfMfIVGiLKM

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Guo, Qiaona, Jiangwei Huang, Zhifang Zhou i Jinguo Wang. "Experiment and Numerical Simulation of Seawater Intrusion under the Influences of Tidal Fluctuation and Groundwater Exploitation in Coastal Multilayered Aquifers". Geofluids 2019 (18.07.2019): 1–17. http://dx.doi.org/10.1155/2019/2316271.

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The dynamic behavior of groundwater flow and salt transport is affected by tide and pumping in coastal multilayered aquifers. In this paper, two groups of experiments were conducted considering different constant head inland boundaries. The fluctuation of the groundwater level and the process of seawater intrusion in the multilayered aquifers were observed. A two-dimensional SEAWAT model is developed to simulate the seawater intrusion to coastal aquifers under the influences of tidal fluctuation and groundwater exploitation. The hydrogeological parameters in the model are calibrated by the records of the groundwater level and salinity measurements. The results showed that the simulated groundwater level and salt concentration match the observation well. The groundwater level has the characteristics of periodic fluctuation with tide. The lag time of the groundwater level fluctuation in each monitoring point increases slightly with the increasing distance from the saltwater chamber. For the low tide, the inland freshwater recharge has main effect on groundwater level fluctuation. The rising tide has a negative effect on the drawdown of the groundwater level induced by pumping. For the high tide, the tide plays a major role on groundwater level fluctuation, compared with the inland freshwater recharge. Compared with the condition of high head of inland recharge, larger saltwater intrusion lengths and area have been observed and simulated in the aquifer, which means that faster inland motion of the seawater wedge would occur when the inland recharge is small in the coastal aquifers. It revealed that inland recharge plays a major role in the seawater intrusion for the same pumping rate of groundwater in different seasons. The analysis provides insights into how the tide fluctuation, groundwater pumping, and inland recharge effect on the area and rates of seawater intrusion.

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Kaniraj, S. R., L. J. Lee i S. N. L. Taib. "Effect of Tidal Fluctuation on the Stability of Estuarine Structures in Sarawak". Journal of Civil Engineering, Science and Technology 5, nr 3 (1.12.2014): 18–24. http://dx.doi.org/10.33736/jcest.141.2014.

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Several incidents of lateral movement and failures of estuarine structures have been reported in Sarawak. These structures located in very soft and deep sedimentary soils are usually supported on pile foundations. There is a 4 to 7 m daily tidal fluctuation in these locations, the effect of which on the ground and the piles is usually neglected in design. A study has been undertaken to formulate improved approaches for the design of riverine and estuarine structures. The validation of a theoretical model requires data on ground movement and pore water pressure changes due to tidal fluctuation. Accordingly, piezometers and inclinometer casings were installed at the sites of two structures where a bridge and jetty are proposed to be constructed. The inclinometers measure the lateral movement of the river banks and a pile installed in the riverbed. The piezometer and inclinometer readings are being recorded periodically. The paper explains the background of the study, case histories of failures, soil conditions at the two sites, details of instrumentation, results of measurement, and the interpretations.

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Imanudin, Momon Sodik, Edi Armanto, Robiyanto Hendro Susanto i Siti Masreah Bernas. "Water Table Fluctuation in Tidal Lowland for Developing Agricultural Water Management Strategies". Jurnal TANAH TROPIKA (Journal of Tropical Soils) 15, nr 3 (1.09.2010): 277–82. http://dx.doi.org/10.5400/jts.2010.15.3.277.

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Zhang, Hua. "Characterization of a multi-layer karst aquifer through analysis of tidal fluctuation". Journal of Hydrology 601 (październik 2021): 126677. http://dx.doi.org/10.1016/j.jhydrol.2021.126677.

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BINDOFF, N. L., F. E. M. LILLEY i J. H. FILLOUX. "A separation of ionospheric and oceanic tidal components in magnetic fluctuation data." Journal of geomagnetism and geoelectricity 40, nr 12 (1988): 1445–67. http://dx.doi.org/10.5636/jgg.40.1445.

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Erskine, A. D. "The Effect of Tidal Fluctuation on a Coastal Aquifer in the UK". Ground Water 29, nr 4 (lipiec 1991): 556–62. http://dx.doi.org/10.1111/j.1745-6584.1991.tb00547.x.

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Asadi-Aghbolaghi, Mahdi, Mo-Hsiung Chuang i Hund-Der Yeh. "Groundwater Response to Tidal Fluctuation in an Inhomogeneous Coastal Aquifer-Aquitard System". Water Resources Management 28, nr 11 (9.06.2014): 3591–617. http://dx.doi.org/10.1007/s11269-014-0689-9.

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FUJITA, Tetsuro, Toru ENDO, Toshiyuki TANAKA i Susumu YAMOCHI. "A Research on the Fluctuation of CO2 Flux from the Sediment of Tidal Flat in accompanied with Tidal Change". Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 69, nr 2 (2013): I_1181—I_1185. http://dx.doi.org/10.2208/kaigan.69.i_1181.

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Ngudiantoro, Hidayat Pawitan, Muhammad Ardiansyah, M Yanuar J. Purwanto i Settings Robiyanto H. Susanto. "PEMODELAN FLUKTUASI MUKA AIR TANAH UNTUK MENDUKUNG PENGELOLAAN AIR PADA PERTANIAN LAHAN RAWA PASANG SURUT TIPE A/B". Jurnal Matematika Sains dan Teknologi 10, nr 2 (15.08.2009): 92–101. http://dx.doi.org/10.33830/jmst.v10i2.582.2009.

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The objectives of this research are to develop a model of water table fluctuation on tidal lowland area of A/B type. The results of the research are expected to support of the agricultural development on tidal lowland area, especially on water management, because the water management play an important role in the agricultural on tidal lowland area. The water table on tidal lowland area fluctuates according to space and time. The water table controls at a certain depth can support the plant growth and the pyrite oxidation restraint. The model of water table fluctuation which is developed in this research based on the ellipse concept. The research was conducted on the reclamation area of tidal lowland at the fourth tertiary block in P8-12S Delta Telang I, Banyuasin district, South Sumatra province. The simulations of model show good result of estimating the depth of water table on tidal lowland area of A/B type. The proportion of variation the depth of water table which can be explained by model that is 89,6% up to 95,5% with standard error of the estimate is 0,021-0,035 meters. The parameter of the water level in the tertiary canals has high sensitivity to the model.

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Deguchi, Ichiro, Mamoru Arita i Takumi Yoshii. "FLUCTUATION OF RIP CURRENT MEASURED IN SHALLOW WATER REGION WITH SMALL TIDAL RANGE". Coastal Engineering Proceedings 1, nr 32 (25.01.2011): 44. http://dx.doi.org/10.9753/icce.v32.currents.44.

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Disappearance and formation processes of rip channel are discussed based on the field measurements of wave height, current velocity, bottom topography and flow pattern of near-shore current. Sudden increase in wave height together with the change in the wave direction took place during a half day caused these phenomena and rip current rose and fell according to the transition of the bottom topography. Furthermore, flow pattern of rip current was not steady but transformed itself with low frequency fluctuations of the period of few minutes. It is found that such low frequency fluctuations are caused by the intrinsic fluctuations of the incident waves (grouping waves) through the numerical simulations.

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Liu, Cong, Xiaoyi Wang, Xiaofeng Yu, Yuhua Zhang, Zhizhen Qiu i Xiangrong Xu. "Power Coefficient Analysis of Double-blade Half-rotating Impeller Tidal Turbine Operating at Yaw". E3S Web of Conferences 242 (2021): 03008. http://dx.doi.org/10.1051/e3sconf/202124203008.

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The double-blade half-rotating impeller tidal turbine (DHITT) is a new type of vertical shaft tidal current turbine with lift and resistance performance. The power coefficient of the DHITT is affected by the flow direction. In order to research the power coefficient (CP) of the DHITT under different flow direction, the optimal attack flow angle of a half-impeller turbine was explored, and the fluctuation of power coefficient of the DHITT operating at yaw was analyzed based on the optimal attack flow angle. The unsteady flow of the turbine was simulated by overlapping grid technique, and the fluctuation of the turbine’s power coefficient under different flow directions was analyzed, which was verified by experiments. The results have demonstrated that the power coefficient at the optimal angle of attack is 0.53. As the yaw angle greater than 30º, the power reduction is nearly 40%, but the average efficiency loss is only 3.7% in the range of -3º to 3º.

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Zhou, Pengpeng, Xiaojuan Qiao i Xiaolei Li. "Numerical modeling of the effects of pumping on tide-induced groundwater level fluctuation and on the accuracy of the aquifer's hydraulic parameters estimated via tidal method: a case study in Donghai Island, China". Journal of Hydroinformatics 19, nr 4 (15.03.2017): 607–19. http://dx.doi.org/10.2166/hydro.2017.089.

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Coastal groundwater level is affected both by tide and pumping. This paper presents a numerical model to study the effects of pumping on tide-induced groundwater level fluctuation and on accuracy of hydraulic parameters estimated via tidal method. Firstly, for the effects of pumping on the groundwater level fluctuation under the combined influence of pumping and tide, groundwater level has a drawdown but eventually reaches a quasi-steady-state again. Steady pumping can attenuate the amplitude but cannot affect the phase of the quasi-steady fluctuation. However, seaward steady pumping plays a relatively obvious role in enhancing drawdown compared with landward pumping, a partial penetration well leads to greater drawdown than a full penetration well, and transient pumping induces large amplitude which does not reflect large transmissivity. Secondly, for the effects of pumping on the accuracy of the parameter estimated via the tidal method, transient pumping or large steady pumping, especially in a full penetration well, significantly affects accuracy of the estimated parameters. However, when the distance between the pumping well and tide observation well exceeds 200% of the distance between observation well and shoreline, pumping effect on estimated parameters can be neglected. The conclusions could provide guidance for reasonable application of the tidal method.

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Burchard, Hans, Henk M. Schuttelaars i W. Rockwell Geyer. "Residual Sediment Fluxes in Weakly-to-Periodically Stratified Estuaries and Tidal Inlets". Journal of Physical Oceanography 43, nr 9 (1.09.2013): 1841–61. http://dx.doi.org/10.1175/jpo-d-12-0231.1.

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Abstract In this idealized numerical modeling study, the composition of residual sediment fluxes in energetic (e.g., weakly or periodically stratified) tidal estuaries is investigated by means of one-dimensional water column models, with some focus on the sediment availability. Scaling of the underlying dynamic equations shows dependence of the results on the Simpson number (relative strength of horizontal density gradient) and the Rouse number (relative settling velocity) as well as impacts of the Unsteadiness number (relative tidal frequency). Here, the parameter space given by the Simpson and Rouse numbers is mainly investigated. A simple analytical model based on the assumption of stationarity shows that for small Simpson and Rouse numbers sediment flux is down estuary and vice versa for large Simpson and Rouse numbers. A fully dynamic water column model coupled to a second-moment turbulence closure model allows to decompose the sediment flux profiles into contributions from the transport flux (product of subtidal velocity and sediment concentration profiles) and the fluctuation flux profiles (tidal covariance between current velocity and sediment concentration). Three different types of bottom sediment pools are distinguished to vary the sediment availability, by defining a time scale for complete sediment erosion. For short erosion times scales, the transport sediment flux may dominate, but for larger erosion time scales the fluctuation sediment flux largely dominates the tidal sediment flux. When quarter-diurnal components are added to the tidal forcing, up-estuary sediment fluxes are strongly increased for stronger and shorter flood tides and vice versa. The theoretical results are compared to field observations in a tidally energetic inlet.

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Zhang, Xiaoqin, Weimin Bao, Simin Qu i Zhongbo Yu. "One-dimensional hydrodynamic model accounting for tidal effect". Hydrology Research 43, nr 1-2 (1.02.2012): 113–22. http://dx.doi.org/10.2166/nh.2011.114.

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Tidal effect has a significant impact on flood routing in tidal rivers, conceptually taking on a resistant effect during flood tide and a dynamic effect during ebb tide. Two expressions were developed to reflect the tidal effect in this study, which consisted of the tidal wave velocity, the change rate of tidal level and the change in channel width. By incorporating the expressions into the momentum equation of the one-dimensional (1D) Saint-Venant equations, we propose that there are two types of momentum equations accounting for tidal effect. Based on the continuity equation and proposed momentum equations, two types of 1D hydrodynamic model for tidal rivers (namely the SVN-1 and -2 models) were constructed. In the case study, these models were applied to the tidal reach of the Qiantang River in China. The simulation results show that the SVN-1 and -2 models can obtain better accuracy than the SVN model based on the standard Saint-Venant equations, and that the SVN-1 model performs better than the SVN-2 model. Furthermore, the SVN-1 model can effectively capture water-level fluctuation, indicating that the expression employed is capable of accounting for tidal effect.

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Moon, J. W., Y. Song, H. S. Moon i G. H. Lee. "Clay minerals from tidal flat sediments at Youngjong Island, Korea, as a potential indicator of sea-level change". Clay Minerals 35, nr 5 (grudzień 2000): 841–55. http://dx.doi.org/10.1180/000985500547278.

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AbstractClay minerals from the tidal flat sediments along the coast of Youngjong Island, west of mainland Korea, were studied to ascertain their potential as an indicator of sea-level fluctuation. Semi-quantitative analysis of their clay-size fractions by XRD shows that the vertical distribution of clay minerals can be separated into four clay mineral assemblage units. Based on the relative contents of chlorite, four sedimentary units are distinguishable, and the abundance of chlorite is inversely related to that of smectite. The kaolinite content is constant, and so it is clear that chlorite originating from the Han River was transformed to smectite by pedogenesis during regression periods. Therefore, the relative contents of clay minerals from the unconsolidated materials in the tidal flat of Youngjong Island canbe used as indicators of transgression and regression in accordance with the sea-level fluctuation.

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Kleinhans, Maarten G., Maarten van der Vegt, Jasper Leuven, Lisanne Braat, Henk Markies, Arjan Simmelink, Chris Roosendaal, Arjan van Eijk, Paul Vrijbergen i Marcel van Maarseveen. "Turning the tide: comparison of tidal flow by periodic sea level fluctuation and by periodic bed tilting in scaled landscape experiments of estuaries". Earth Surface Dynamics 5, nr 4 (28.11.2017): 731–56. http://dx.doi.org/10.5194/esurf-5-731-2017.

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Abstract. Analogue models or scale experiments of estuaries and short tidal basins are notoriously difficult to create in the laboratory because of the difficulty to obtain currents strong enough to transport sand. Our recently discovered method to drive tidal currents by periodically tilting the entire flume leads to intense sediment transport in both the ebb and flood phase, causing dynamic channel and shoal patterns. However, it remains unclear whether tilting produces periodic flows with characteristic tidal properties that are sufficiently similar to those in nature for the purpose of landscape experiments. Moreover, it is not well understood why the flows driven by periodic sea level fluctuation, as in nature, are not sufficient for morphodynamic experiments. Here we compare for the first time the tidal currents driven by sea level fluctuations and by tilting. Experiments were run in a 20 × 3 m straight flume, the Metronome, for a range of tilting periods and with one or two boundaries open at constant head with free inflow and outflow. Also, experiments were run with flow driven by periodic sea level fluctuations. We recorded surface flow velocity along the flume with particle imaging velocimetry and measured water levels along the flume. We compared the results to a one-dimensional model with shallow flow equations for a rough bed, which was tested on the experiments and applied to a range of length scales bridging small experiments and large estuaries. We found that the Reynolds method results in negligible flows along the flume except for the first few metres, whereas flume tilting results in nearly uniform reversing flow velocities along the entire flume that are strong enough to move sand. Furthermore, tidal excursion length relative to basin length and the dominance of friction over inertia is similar in tidal experiments and reality. The sediment mobility converges between the Reynolds method and tilting for flumes hundreds of metres long, which is impractical. Smaller flumes of a few metres in length, on the other hand, are much more dominated by friction than natural systems, meaning that sediment suspension would be impossible in the resulting laminar flow on tidal flats. Where the Reynolds method is limited by small sediment mobility and high tidal range relative to water depth, the tilting method allows for independent control over the variables flow depth, velocity, sediment mobility, tidal period and excursion length, and tidal asymmetry. A periodically tilting flume thus opens up the possibility of systematic biogeomorphological experimentation with self-formed estuaries.

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Xu, Xitong, Shengbo Chen, Yan Yu i Sen Zhang. "Atmospheric Anomaly Analysis Related to Ms > 6.0 Earthquakes in China during 2020–2021". Remote Sensing 13, nr 20 (11.10.2021): 4052. http://dx.doi.org/10.3390/rs13204052.

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The attention towards links of atmospheric parameter variation and earthquakes has increased exponentially by utilizing new methods and more accurate observations. Persistent research makes it possible to gain insight into the precursor mechanism of earthquakes. In this paper, we studied the universality of detecting atmospheric anomalies associated with earthquakes based on tidal force fluctuation in China for earthquakes of Ms > 6.0, and explored the influence of tidal force on tectonic stress. The data of air temperature, geopotential height, ozone mixing ratio, and relative humidity from the National Center for Environmental Prediction (NCEP) were analyzed to reveal the spatiotemporal variation of atmospheric anomalies at multiple isobaric surfaces. Furthermore, the coupling of atmospheric parameters was investigated. The results showed that continuous solicitation exerted by tidal forces could change the strength of tectonic stress that causes earthquakes. The evolution pattern of air temperature, geopotential height, and relative humidity could be supported by atmospheric thermal vertical diffusion, while the anomalies of ozone mixing ratio was not evident. This verified the feasibility of detecting multi-parameter atmospheric anomalies associated with earthquakes based on tidal force fluctuation. Our results provide more evidence for understanding the atmospheric precursor characteristics of earthquakes.

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Lee, J. S., i L. P. Lee. "Ventilatory changes of pulmonary capillary blood volume assessed by arterial density". Journal of Applied Physiology 61, nr 5 (1.11.1986): 1724–31. http://dx.doi.org/10.1152/jappl.1986.61.5.1724.

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By use of an improved density measuring system, we found that the gravimetric density of arterial blood of dogs fluctuates at the same frequency as the spontaneous or mechanical ventilation. Similar density fluctuations were observed in the blood leaving isolated, perfused lobes of dogs that were ventilated cyclicly. Employing an analysis that balanced the erythrocyte and plasma flows through distensible capillaries containing blood with a tube hematocrit lower than the hematocrit in large blood vessels, we derived a relationship to estimate from the density fluctuation the change in pulmonary capillary blood volume (Vc). For mechanical ventilation, the maximum change in density over one ventilation cycle increased from 0.084 +/- 0.01 to 0.47 +/- 0.05 (SE) g/l as the frequency decreased from 29 to 6 cycles/min. These density changes were estimated to be the result of an 1–16% change in Vc. A larger tidal volume for the mechanical ventilation led to a larger density fluctuation. The maximum density change of spontaneous respiration of 6 cycles/min was one-sixth of the mechanical case, indicating a much smaller change in Vc during spontaneous respiration. When the airway flow resistance was increased for spontaneous respiration, larger density fluctuations were observed.

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SHIN, AYOUNG, DONGSUNG KIM, TEAWOOK KANG, JE HYEOK OH, JIMIN LEE i JAE-SANG HONG. "Seasonal Fluctuation of Meiobenthic Fauna Community at Keunso Tidal Flat in Taean, Korea". Sea 21, nr 4 (30.11.2016): 144–57. http://dx.doi.org/10.7850/jkso.2016.21.4.144.

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Sun, Ke, Gang Ma, Hongwei Wang i Zhichuan Li. "Hydrodynamic performance of a vertical axis tidal current turbine with angular speed fluctuation". Ships and Offshore Structures 14, sup1 (19.03.2019): 311–19. http://dx.doi.org/10.1080/17445302.2019.1589975.

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Wang, Quanrong, Hongbin Zhan i Zhonghua Tang. "Two-dimensional flow response to tidal fluctuation in a heterogeneous aquifer-aquitard system". Hydrological Processes 29, nr 6 (22.04.2014): 927–35. http://dx.doi.org/10.1002/hyp.10207.

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CHUANG, MO-HSIUNG, i HUND-DER YEH. "A generalized solution for groundwater head fluctuation in a tidal leaky aquifer system". Journal of Earth System Science 120, nr 6 (grudzień 2011): 1055–66. http://dx.doi.org/10.1007/s12040-011-0128-8.

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Shaikh, Bushra Y., i Samir K. Das. "Effect of tidal fluctuation on water table in a sloping leaky unconfined aquifer". Modeling Earth Systems and Environment 3, nr 4 (2.09.2017): 1395–407. http://dx.doi.org/10.1007/s40808-017-0359-z.

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Zhang, Wanchao, Yujie Zhou, Kai Wang i Xiaoguo Zhou. "Forced Motion CFD Simulation and Load Refinement Evaluation of Floating Vertical-Axis Tidal Current Turbines". Polish Maritime Research 27, nr 3 (1.09.2020): 40–49. http://dx.doi.org/10.2478/pomr-2020-0045.

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AbstractSimulation of the hydrodynamic performance of a floating current turbine in a combined wave and flow environment is important. In this paper, ANSYS-CFX software is used to analyse the hydrodynamic performance of a vertical-axis turbine with various influence factors such as tip speed ratio, pitching frequency and amplitude. Time-varying curves for thrust and lateral forces are fitted with the least squares method; the added mass and damping coefficients are refined to analyse the influence of the former factors. The simulation results demonstrate that, compared with non-pitching and rotating turbines under constant inflow, the time-varying load of rotating turbines with pitching exhibits an additional fluctuation. The pitching motion of the turbine has a positive effect on the power output. The fluctuation amplitudes of thrust and lateral force envelope curves have a positive correlation with the frequency and amplitude of the pitching motion and tip speed ratio, which is harmful to the turbine’s structural strength. The mean values of the forces are slightly affected by pitching frequencies and amplitudes, but positively proportional to the tip speed ratio of the turbine. Based upon the least squares method, the thrust and lateral force coefficients can be divided into three components, uniform load coefficient, added mass and damping coefficients, the middle one being significantly smaller than the other two. Damping force plays a more important role in the fluctuation of loads induced by pitching motion. These results can facilitate study of the motion response of floating vertical-axis tidal current turbine systems in waves.

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Gan, Min, Yongping Chen, Shunqi Pan, Jiangxia Li i Zijun Zhou. "A Modified Nonstationary Tidal Harmonic Analysis Model for the Yangtze Estuarine Tides". Journal of Atmospheric and Oceanic Technology 36, nr 4 (kwiecień 2019): 513–25. http://dx.doi.org/10.1175/jtech-d-18-0199.1.

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AbstractInfluenced by river discharge, the tidal properties of estuarine tides can be more complex than those of oceanic tides, which makes the tidal prediction less accurate when using a classical tidal harmonic analysis approach, such as the T_TIDE model. Although the nonstationary tidal harmonic analysis model NS_TIDE can improve the accuracy for the analysis of tides in a river-dominated estuary, it becomes less satisfactory when applying the NS_TIDE model to a mesotidal estuary like the Yangtze estuary. Through the error source analysis, it is found that the main errors originate from the low frequency of tidal fluctuation. The NS_TIDE model is then modified by replacing the stage model with the frequency-expanded tidal–fluvial model so that more subtidal constituents, especially the “atmospheric tides,” can be taken into account. The results show that the residuals from tidal harmonic analysis are significantly reduced by using the modified NS_TIDE model, with the yearly root-mean-square-error values being only 0.04–0.06 m for the Yangtze estuarine tides.

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Eaton, T. T., i C. Yi. "Hydroperiod and hydraulic loading for treatment potential in urban tidal wetlands". Hydrology and Earth System Sciences Discussions 6, nr 1 (30.01.2009): 589–625. http://dx.doi.org/10.5194/hessd-6-589-2009.

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Abstract. Conventional methods of estimating water quality improvement due to wetland treatment are not well suited to the dynamic water level and wetted area fluctuations observed in coastal settings. We present a new method to quantify hydroperiod and hydraulic loading at different elevations in a coastal wetland profile in which the principal inflows and outflows are due to tides. We apply our method to an urban coastal setting (part of the New York-New Jersey Harbor Estuary) where a major water quality problem persists due to fecal coliform contamination from combined sewer overflow (CSO) discharges. Based on three types of simplified hydrograph, we show how such an approach and conceptual model of a terraced tidal wetland with constant mean slope can be used to assess hydrologic constraints for wetland vegetation species and the potential treatment effectiveness for adjacent impaired coastal waters. Resulting hydroperiods and hydraulic loading values decrease approximately exponentially with elevation along the wetland profile with considerable variation in overall slope depending on the hydrograph pattern. Application of a first-order contamination reduction model using our calculated hydraulic loadings indicates that such tidal treatment wetlands could reduce average fecal coliform concentrations in the range of 27% to 94% depending on the pattern of water level fluctuation, wetland surface elevation and vegetation density. Our analysis shows the performance potential for tidal wetlands to treat adjacent coastal waters. Restoration of existing salt marshes, and construction of new tidal wetlands would therefore be a promising part of an ecohydrologic strategy to improve water quality in contaminated urban coastal settings like the New York-New Jersey Harbor Estuary.

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Guo, Gai Mei, Hong Ying Chen, Chun Hu Wang, Peng Fei Liu, You Han Wang i Jin Jun Wang. "Effect of Water Flow Pattern on the Treatment of Discharged Sewage by Biological Accelerator-Bio-Film Process". Advanced Materials Research 391-392 (grudzień 2011): 130–33. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.130.

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The paper studied the effect of water flow pattern on the treatment of disorderly discharged sewage in tidal rivers by bio-film process. The results indicated that biomass was greater under the fluctuation turn flow than under the folding flow around. Under the fluctuation turn flow, the concentration of COD was 168mg/L and the removal rate of COD was 37.1%. Under the folding flow around, the concentration of COD was 187mg/L and the removal rate of COD was 29.4%. The results indicated that the removal rate of COD was higher 7.7% under the fluctuation turn flow than under the folding flow around. The reason was that under the fluctuation turn flow, soft packing fiber was derided by water, and the effective use of surface area was great and microbial growth space was large.

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Wise, Richard G., Kyle TS Pattinson, Daniel P. Bulte, Peter A. Chiarelli, Stephen D. Mayhew, George M. Balanos, David F. O'Connor i in. "Dynamic Forcing of End-Tidal Carbon Dioxide and Oxygen Applied to Functional Magnetic Resonance Imaging". Journal of Cerebral Blood Flow & Metabolism 27, nr 8 (4.04.2007): 1521–32. http://dx.doi.org/10.1038/sj.jcbfm.9600465.

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Investigations into the blood oxygenation level-dependent (BOLD) functional MRI signal have used respiratory challenges with the aim of probing cerebrovascular physiology. Such challenges have altered the inspired partial pressures of either carbon dioxide or oxygen, typically to a fixed and constant level (fixed inspired challenge (FIC)). The resulting end-tidal gas partial pressures then depend on the subject's metabolism and ventilatory responses. In contrast, dynamic end-tidal forcing (DEF) rapidly and independently sets end-tidal oxygen and carbon dioxide to desired levels by altering the inspired gas partial pressures on a breath-by-breath basis using computer-controlled feedback. This study implements DEF in the MRI environment to map BOLD signal reactivity to CO2. We performed BOLD (T2*) contrast FMRI in four healthy male volunteers, while using DEF to provide a cyclic normocapnichypercapnic challenge, with each cycle lasting 4 mins (PetCO2 mean±s.d., from 40.9 ± 1.8 to 46.4 ± 1.6 mm Hg). This was compared with a traditional fixed-inspired (FiCO2 = 5%) hypercapnic challenge (PetCO2 mean±s.d., from 38.2 ± 2.1 to 45.6 ± 1.4 mm Hg). Dynamic end-tidal forcing achieved the desired target PetCO2 for each subject while maintaining PetCO2 constant. As a result of CO2-induced increases in ventilation, the FIC showed a greater cyclic fluctuation in PetCO2. These were associated with spatially widespread fluctuations in BOLD signal that were eliminated largely by the control of PetCO2 during DEF. The DEF system can provide flexible, convenient, and physiologically well-controlled respiratory challenges in the MRI environment for mapping dynamic responses of the cerebrovasculature.

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Yusran, Fadly Hairannoor. "Relationship between Organic-C and Available-P Due to Tidal Fluctuation in South Kalimantan". Jurnal TANAH TROPIKA (Journal of Tropical Soils) 17, nr 3 (1.09.2012): 253–57. http://dx.doi.org/10.5400/jts.2012.17.3.253.

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Oo, Phyo Zaw, Suwanna Kitpati Boontanon, Narin Boontanon, Shuhei Tanaka i Shigeo Fujii. "Horizontal variation of microplastics with tidal fluctuation in the Chao Phraya River Estuary, Thailand". Marine Pollution Bulletin 173 (grudzień 2021): 112933. http://dx.doi.org/10.1016/j.marpolbul.2021.112933.

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Jiao, Jiu Jimmy, i Zhonghua Tang. "An analytical solution of groundwater response to tidal fluctuation in a leaky confined aquifer". Water Resources Research 35, nr 3 (marzec 1999): 747–51. http://dx.doi.org/10.1029/1998wr900075.

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