带乘性噪声的一类非线性系统的滤波算法     

褚东升  张征 《中国海洋大学学报(自然科学版)》2006,36(4):569-572

针对带乘性噪声的一类非线性系统,给出了1种带单重渐消因子的强跟踪状态滤波算法。该算法将非线性系统线性化后,采用了线性最小方差估计方法来进行状态估计,通过运用正交原理和引入渐消因子,使得滤波效果具有强跟踪的优良性能。该算法扩展了卡尔曼滤波在带乘性噪声非线性系统状态估计中的应用范围。仿真结果表明了该算法的有效性。  相似文献   

Transient soil response in a porous seabed with variable permeability     

Brian R. Seymour  Dong S. Jeng  John R.C. Hsu 《Ocean Engineering》1996,23(1):27-46

The soil permeability of many natural marine sediments decreases with depth because of consolidation under overburden pressure. This is accompanied by a decrease in porosity and void ratio that also affect the permeability. Conventional theories for wave-induced soil response have assumed a homogeneous porous seabed. This paper presents a new approach for the wave-induced response in a soil matrix, with variable permeability as a function of burial depth. The soil matrix considered is unsaturated and anisotropic, and is subject to a three-dimensional wave system. The pore pressure and effective stresses induced by such a system are obtained from a set of equations incorporating a variable permeability. Verification is available through reduction to the simple case of uniform permeability. The results indicate that the effect of variable soil permeability on pore pressure and vertical effective stress may be significant, especially in a gravelled seabed and for unsaturated sandy soils.  相似文献   

A semi-analytical solution for random wave-induced soil response and seabed liquefaction in marine sediments     

Haijiang Liu  Dong-Sheng Jeng   《Ocean Engineering》2007,34(8-9):1211-1224

In this study, unlike most previous investigations for wave-induced soil response, a simple semi-analytical model for the random wave-induced soil response is established for an unsaturated seabed of finite thickness. Two different wave spectra, the B-M and JONSWAP spectra, are considered in the new model. The influence of random wave loading on the soil response is investigated by comparing with the corresponding representative regular wave results through a parametric study, which includes the effect of the degree of saturation, soil permeability, wave height, wave period and seabed thickness. The maximum liquefaction depth under the random waves is also examined. The difference on the soil response under the two random wave types, B-M and JONSWAP frequency spectra, is also discussed in the present work.  相似文献   

Effects of cold eddy on phytoplankton production and assemblages in Luzon strait bordering the South China Sea   总被引：6，自引：0，他引：6  

Yuh-Ling Lee Chen  Houng-Yung Chen  I. -I. Lin  Ming-An Lee  Jeng Chang 《Journal of Oceanography》2007,63(4):671-683

The biochemical effects of a cold-core eddy that was shed from the Kuroshio Current at the Luzon Strait bordering the South China Sea (SCS) were studied in late spring, a relatively unproductive season in the SCS. The extent of the eddy was determined by time-series images of SeaWiFS ocean color, AVHRR sea surface temperature, and TOPEX/Jason-1 sea surface height anomaly. Nutrient budgets, nitrate-based new production, primary production, and phytoplankton assemblages were compared between the eddy and its surrounding Kuroshio and SCS waters. The enhanced productivity in the eddy was comparable to wintertime productivity in the SCS basin, which is supported by upwelled subsurface nitrate under the prevailing Northeastern Monsoon. There were more Synechococcus, pico-eucaryotes, and diatoms, but less Trichodesmium in the surface water inside the eddy than outside. Prochlorococcus and Richelia intracellularis showed no spatial differences. Water column-integrated primary production (IPP) inside the eddy was 2–3 times that outside the eddy in the SCS (1.09 vs. 0.59 g C m⁻²d⁻¹), as was nitrate-based new production (INP) (0.67 vs. 0.25 g C m⁻²d⁻¹). INP in the eddy was 6 times that in the Kuroshio (0.12 g C m⁻²d⁻¹). IPP and INP in the eddy were higher than the maximum production values ever measured in the SCS basin. Surface chlorophyll a concentration (0.40 mg m⁻³) in the eddy equaled the maximum concentration registered for the SCS basin and was higher than the wintertime average (0.29 ± 0.04 mg m⁻³). INP was 3.5 times as great and IPP was doubled in the eddy compared to the wintertime SCS basin. As cold core eddies form intermittently all year round as the Kuroshio invades the SCS, their effects on phytoplankton productivity and assemblages are likely to have important influences on the biogeochemical cycle of the region.  相似文献   

Computations of the almost highest short-crested waves in deep water   总被引：1，自引：0，他引：1  

C. P. TsaiD. S. Jeng  J. R. C. Hsu 《Applied Ocean Research》1994,16(6):317-326

The highest short-crested waves have been studied analytically and numerically by several workers, but without a conclusive view. An efficient numerical scheme is proposed in this paper which retains the water-surface elevations in an implicit form in the governing equations, rather than using a series approximation, thus improving the accuracy of the numerical results. Convergence of the numerical scheme is verified. The almost highest short-crested waves in deep water are then evaluated, which are defined for the condition with the largest wave energies. It is found that the critical angle for wave frequency reversal also demarcates the wave characteristics near breaking, for either kinematic or dynamic prominence. The known results available for the limiting two-dimensional cases of standing and progressive waves are compared favourably.  相似文献   

Stress and deformation of offshore piles under structural and wave loading   总被引：3，自引：0，他引：3  

J. A. Eicher  H. Guan  D. S. Jeng   《Ocean Engineering》2003,30(3):369-385

Various offshore structures, especially large structures such as Tension Leg Platforms (TLP), are usually supported by concrete piles as the foundation elements. The stress distribution within such a large structure is a dominant factor in the design procedure of an offshore pile. To provide a more accurate and effective design for offshore foundation systems under axial and lateral wave loads, a finite element model is employed herein to determine the stresses and displacements in a concrete pile under similar loading conditions. A parametric study is also performed to examine the effects of the stress distribution due to the changing loading conditions.  相似文献   

Impact of urban stormwater runoff on estuarine environmental quality     

Hueiwang Anna C. Jeng  Andrew J. Englande  Reda M. Bakeer  Henry B. Bradford 《Estuarine, Coastal and Shelf Science》2005,63(4):513-526

Urban stormwater runoff could contribute to the deterioration of water quality of a receiving water body. In this research, field studies and laboratory experiments were conducted to assess the microbial contamination resulting from urban stormwater runoff into the Lake Pontchartrain estuary. Fecal coliform, Escherichia coli and enterococci were used as indicator organisms. The specific objectives of the research were to examine the distribution of the indicator organisms in different environmental elements (water column, suspended particles and sediment) and to further investigate the mechanisms related to their fate. Results of the research indicated satisfactory water quality at the study sites during dry weather periods. However, a significant increase was observed in the concentrations of the indicator organisms in the water columns and sediment at specific study sites following a given stormwater event. Three to seven days were needed for the elevated indicator organisms to return back to their background levels in the water column and sediment, respectively. The mechanism of sedimentation contributed to a reduction in the microbial concentration in the water column, as the indicator organisms were found to attach to the suspended particles in the stormwater. The percentage of fecal coliform, E. coli and enterococci attached to the suspended particles was found to be within the range of 9.8–27.5%, 21.8–30.4%, and 8.4–11.5% of the total indicator organisms in the stormwater loaded into the estuary, respectively. About 75–80% of the total indicator organisms remained free-floating for some distance in the water column before dying off.  相似文献   

On the crust structure near focus and the far-field body wave synthetic seismograms     

Dong-Sheng Li  Hui-Lan Zhou 《地震学报(英文版)》1993,6(4):823-831

In this paper we discuss two types of crust models with abnormal density, velocity of wave and certain geometrical structures. The far-field synthetic seismograms of P and SH wave are calculated by the far-field vertical displacement formulas of P and SH waves with the double couple point source and the formulas of reflection coefficient, radiation pattern and travelling time difference derived from the models suggested in the paper. It is shown by the results that the effect of special crust structures near focus on the far-field seismograms can be ignored if the densities and wave velocity of the special structure are less than average those of the crust (model I). However the effect should be noticed if the densities and wave velosities of the structure are large than average those of the crust (modelI). The effect of the special crust structure on the far-field seismograms has not been studied further before. Seismic records of the Haicheng earthquake and the crust structure in Haicheng region are studied by the calculation method in the paper. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 1993.  相似文献   

Ultrashallow seismic experiment on a trenched section of the Chelunpu fault zone, Taiwan     

Yih Jeng  Chih-Sung Chen  Hung-Ming Yu  Andres Shiuan-Ru Jeng  Chou-Yi Tang  Ming-Juin Lin 《Tectonophysics》2007,443(3-4):255

Ultrashallow P-wave seismic reflection experiments were conducted at a model test site and in a trenched shallow fault zone along the Chelunpu fault line. The field layout was designed to have the shallowest undistorted reflection from about 1 m depth with 0.5 m vertical resolution. The smallest group interval tested in this study was 0.05 m with a 0.25 ms sample interval, which can avoid spatial aliasing of ground roll if the target is very shallow and the velocities are low. Data processing was designed to be simple but consistent. As the ultrashallow reflections may be contaminated with high-amplitude coherent noise in many aspects, first break muting and surgical muting were performed on each file as detailed as possible, and f–k filtering was applied mainly for the purpose of attenuating the aliasing energy and back-scattered noise. Data acquired in this study show that the low P-wave velocities (< 200 m/s) and high dominant frequencies (120–200 Hz) of near-surface layers may have a potential vertical resolution of 0.4 m or even better.Comparing the test profile with the ground-penetrating radar (GPR) control profile of the same test site and correlating the results obtained from the study site with those of the geologic cross-section of the trench, this experiment demonstrates the possibility of using seismic methods in investigating shallow structures at depths of less than a few meters with vertical resolution comparable to the GPR technique.  相似文献   

带乘性噪声广义系统状态最优估计算法     

褚东升  高守婉 《中国海洋大学学报(自然科学版)》2008,38(5)

针对带乘性噪声广义系统,提出1种在线性最小方差意义下的状态最优估计算法.首先,采用标准分解将系统变换为2个子系统;其次,通过估计子系统的状态,获得原系统的状态最优滤波.同时,算法还给出了动态噪声与量测噪声的估计.仿真结果表明了该算法的有效性.  相似文献