|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | An experimental study of the spatial structures of the instabilities of longshore currents on plane beaches显示文摘A laboratory experiment on alongshore currents is conducted for two plane beaches with slopes 1:40 and 1:100 to investigate the instability of alongshore currents.The dye release experiment is also performed synchronously in surf zone.Complicated and strongly unstable motions of alongshore currents are observed in the experiment.To examine the spatial and temporal variations of the shear instabilities of longshore clearly,dye batches are released in surf zone.The deformation of the dye patch is observed efficiently and effectively with charge coupled device(CCD) system.Some essential characteristics of the shear instability are validated from the results of image analyses of the temporal variation of the dye patch.The influences of alongshore currents,Stokes drift,large-scale vorticity and the shear instabilities on the transport of dye are analyzed using the collected images.The spatial structure of the instabilities of longshore currents is studied by analyzing collected images of the dye patch.And the phase velocity of the meandering movements is obtained through measuring the movement distances of the oscillations of dye patch in alongshore direction with time.The results suggest that the propagation speed of the shear instability is approximately 50%-75% of maximum of mean alongshore currents for irregular and regular waves.The calculated propagation speed using a linear instability analysis theory is compared with the experimental results.The comparison shows agreements between them. | REN Chunping ZOU Zhili | 2012 | Acta Oceanologica Sinica2012，31，6： | 5 |
| 2 | Laboratory study and analysis of the instability of alongshore currents显示文摘A laboratory experiment on the instability of alongshore currents was conducted on a plane beach with slope 1:40. Low-frequency fluctuations of alongshore currents with the period of approxi-mately 100 s were observed. The dominant frequency and amplitudes of the oscillations of along-shore currents were determined using the maximum entropy method and the regression method of trigonometric function. The variations across the beach cross-section of the oscillation amplitudes of the alongshore current were given. The linear shear instability theory was used to analyze the mechanism of the oscillation, and the calculated results agreed with measurements. This confirms that the observed fluctuation of alongshore currents is due to the shear instability of alongshore currents. | REN Chunping ZOU Zhili | 2009 | Acta Oceanologica Sinica2009，28，4： | 3 |
| 3 | Five modified boundary scan adaptive test generation algorithms显示文摘To study the diagnostic problem of Wire-OR (W-O) interconnect fault of PCB (Printed Circuit Board), five modified boundary scan adaptive algorithms for interconnect test are put forward. These algorithms apply Global-diagnosis sequence algorithm to replace the equal weight algorithm of primary test, and the test time is shortened without changing the fault diagnostic capability. The descriptions of five modified adaptive test algorithms are presented, and the capability comparison between the modified algorithm and the original algorithm is made to prove the validity of these algorithms. | Niu Chunping Ren Zheping Yao Zongzhong | 2006 | Journal of Systems Engineering and Electronics2006，17，4： | 1 |
| 4 | A numerical model with Stokes drift for pollutant transport within the surf zone on a plane beach显示文摘This study examines the effects of Stokes drift on pollutant transport within the surf zone on a plane beach both numerically and experimentally. Firstly, the numerical model is described. The wave-induced current is modeled using the concept of the radiation stress. The wave propagation model is based on the wave energy conservation equation. And the advective diffusion model including the Stokes drift is used to describe the pollutant transport in the surf zone. Model validation was achieved in this case versus an analytical solution for an instantaneous point source in a uniform horizontal flow. This study also describes a laboratory experiment on dye release in the surf zone over a plane beach. We examined the final inclination angle required by a continuously released pollutant plume to reach the shoreline under both cases, and transport velocities in the alongshore and cross- shore directions were estimated by linearly fitting the location of a dye-patch front at different time. Results show that this dye patch moved shoreward with an approximate speed of 0.05 m/s (0.017 m/s) between 10 s and 40 s and 0.001 m/s (0.011 m/s) after 40 s for Case 1 (2). This model was then used to simulate pollutant transport in the surf zone on a plane beach as reproduced in the current experiment. Comparisons between our dye transport experiment and numerical results were then also conducted;the data showed that the numerical results including Stokes drift agreed more closely with experimental results than those without it. The data showed that the pollutant was generally transported obviously shoreward in addition to its expected drift along the shore. We also suggest that Stokes drift plays an important role in pollutant movement in the surf zone, especially shoreward. | Chunping Ren Rongrong Liang Chong Yu Yuchuan Bai | 2019 | Acta Oceanologica Sinica2019，38，9： | 1 |
| 5 | Impact of struvite crystallization on nitrogen losses during composting of pig manure and cornstalk显示文摘 | Limei Ren Frank Schuchardt Yujun Shen Guoxue Li Chunping Li | 2009 | Waste Management2009，，5： | 1 |
| 6 | Observing eddy dye patches induced by shear instabilities in the surf zone on a plane beach显示文摘The effects of surf zone eddy generated by alongshore currents on the deformation and transport of dye are still poorly understood,and related tracer release experiments are lacking.Therefore,a tracer release laboratory experiment was conducted under monochromatic,unidirectional incident waves with a large incident angle(30°)on a plane beach with a 1:100 slope in a large wave basin.A charge-coupled device suspended above the basin recorded the dye patch image.The evolution of eddy dye patch was observed and the transport and diffusion were analyzed based on the collected images.Subsequently,a linear instability numerical model was adopted to calculate the perturbation velocity field at the initial stage.The observation and image processing results show that surf zone eddy patches occurred and were separated from the original dye patches.Our numerical analysis results demonstrate that the structure of the perturbation velocity field is consistent with the experimental observations,and that the ejection of eddy patches shoreward or offshore may be ascribed to the double vortex. | Chunping Ren Nannan Fu Chong Yu Yuchuan Bai Kezhao Fang | 2024 | Acta Oceanologica Sinica2024，43，3： | 0 |
| 7 | Applicability Analysis of Four Flow Accumulation Threshold Determination Methods in Loess Eroded Area显示文摘In this paper,a method based on the theory of geomorphic development and drainage fractal dimension is proposed for testing the rationality of four threshold determination methods for catchment area:drainage density method,channel branching method,minimum error in river source distance method,trial and error method.The results show that drainage density method and channel branch method have a good applicability in the watershed of the loess hilly landform and can reflect the accurate information of gully channel.River source minimum error method is controlled by the topography of the river source,which is only applicable to small watershed with little change of topography.Trial and error method is controlled by artificial vision and scale,so it is not suitable for the area with large changes of topography or the complex river network. | Pengju ZHANG Chunping REN | 2021 | Meteorological and Environmental Research2021，12，6： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员