Directional Spectrum of Wind Waves: Part Ⅰ- Model and Derivation     

LIU Yuguang )  *  YAN Xiao-Hai )  SU Ming-Yang ) ) Physical Oceanography Laboratory  College of Marine Environment  Ocean University of China  Qingdao  P..R.China) Center for Remote Sensing  Graduate College of Marine Studies  University of Delaware  Newark  DE  USA) Oceanography Division  Naval Research Laboratory  Stennis Space Center  MS  USA 《中国海洋大学学报(英文版)》2003,2(1)

1　Introduction　Numerousinvestigationsondeepwaterwindwavespectrumhavebeen performed (Phillips ,195 8;Bretschneider,195 9;PiersonandMoscowitz ,196 4;Hasselmannetal.,1973;Donelanetal.,1985 ;Ban ner ,1990 ;Wenetal.,1999) .Ondimensionalground ,Phillips (195 8)suggestedthattheequilibriumfre quencyspectrumofwindwavesfordeepwatershouldbe proportionaltoω- 5,andthecorrespondingwavenumberspectrumshouldbe proportionaltok- 4,whereωistheangularfrequencyandkisthewavenumber.Forfully developedwindwaves…  相似文献   

Directional Spectrum of Wind Waves: Part Ⅱ- Comparison and Confirmation     

LIU Yuguang )  *  YAN Xiao-Hai )  SU Ming-Yang ) ) Physical Oceanography Laboratory  College of Marine Environment  Ocean University of China  Qingdao  P..R.China) Center for Remote Sensing  Graduate College of Marine Studies  University of Delaware  Newark  DE  USA ) Oceanography Division  Naval Research Laboratory  Stennis Space Center  MS  USA 《中国海洋大学学报(英文版)》2003,2(1)

1　Introduction1.1　Proposed ModelonDirectionalFrequencySpec trum　ThisisthePartⅡofthetwo papersetondirection alspectraofwindwaves.Anewmodelonthedirec tionalspectrumofwindwavesfordeepwaterispro posedbasedonthestatisticsofwindwavesinthePartⅠ .Substituting (4 5 )ofPartⅠinto (4 0 )andaddingapeak enhancementitemγΓ,weobtainS(ω ,) =0 .0 0 93αaαwD( ,k) ωpω2 ξ- 4g2ω5×exp - 2 ξ+14[bωp +(1-b)ωp]4ω4 γΓ. (1)Here ,αaisthewaveagefactorofspectralcoefficientdefinedbyαa = ω0 .55…  相似文献   

A coarse-scale compositional model     

Alireza Iranshahr  Yuguang Chen  Denis V. Voskov 《Computational Geosciences》2014,18(5):797-815

In subsurface flow modeling, compositional simulation is often required to model complex recovery processes, such as gas/CO ₂ injection. However, compositional simulation on fine-scale geological models is still computationally expensive and even prohibitive. Most existing upscaling techniques focus on black-oil models. In this paper, we present a general framework to upscale two-phase multicomponent flow in compositional simulation. Unlike previous studies, our approach explicitly considers the upscaling of flow and thermodynamics. In the flow part, we introduce a new set of upscaled flow functions that account for the effects of compressibility. This is often ignored in the upscaling of black-oil models. In the upscaling of thermodynamics, we show that the oil and gas phases within a coarse block are not at chemical equilibrium. This non-equilibrium behavior is modeled by upscaled thermodynamic functions, which measure the difference between component fugacities among the oil and gas phases. We apply the approach to various gas injection problems with different compositional features, permeability heterogeneity, and coarsening ratios. It is shown that the proposed method accurately reproduces the averaged fine-scale solutions, such as component overall compositions, gas saturation, and density solutions in the compositional flow.  相似文献   

Deriving depths of deep chlorophyll maximum and water inherent optical properties: A regional model   总被引：1，自引：0，他引：1  

Peng Xiu  Yuguang Liu  Gang Li  Qing Xu  Haibo Zong  Zengrui Rong  Xiaobin Yin  Fei Chai 《Continental Shelf Research》2009

The Bohai Sea is a semi-enclosed inland sea with case-2 waters near the coast. A comprehensive set of optical data was collected during three cruises in June, August, and September 2005 in the Bohai Sea. The vertical profile measurements, such as chlorophyll concentration, water turbidity, downwelling irradiance, and diffuse attenuation coefficient, showed that the Bohai Sea was vertically stratified with a relative clear upper layer superimposed on a turbid lower layer. The upper layer was found to correspond to the euphotic zone and the deep chlorophyll maximum (DCM) occurs at the base of this layer. By tuning a semi-analytical model (24 and 25) for the Bohai Sea, we developed a method to derive water inherent optical properties and the depth of DCM from above-surface measurements. Assuming a ‘fake’ bottom in the stratified water, this new method retrieves the ‘fake’ bottom depth, which is highly correlated with the DCM depth. The average relative error between derived and measured values is 33.9% for phytoplankton absorption at 440 nm, 25.6% for colored detrital matter (detritus plus gelbstoff) absorption at 440 nm, and 24.2% for the DCM depth. This modified method can retrieve water inherent optical properties and monitor the depth of DCM in the Bohai Sea, and the method is also applicable to other stratified waters.  相似文献   

安徽栏杆含金刚石基性岩中辉石及钛铁矿矿物化学特征     

蔡逸涛  徐敏成  施建斌  杨献忠  张洁  康丛轩  曹正琦  董钟斗  马玉广 《地质通报》2019,38(1):1-13

在中国东部皖北地区分布着新元古代镁铁质岩,岩石类型为辉绿岩、辉绿辉长岩、辉绿玢岩等。其中主要组成矿物为辉石、斜长石、角闪石、铁钛氧化物等。利用电子探针对单斜辉石和钛铁矿进行了详细研究。单斜辉石分析表明,其端元分子组成硅灰石分子(Wo)为33.27～43.04,顽火辉石分子(En)为38.79～46.63,斜方铁辉石(Fs)为10.45～24.83,属于普通透辉石。计算结果及化学成分比值说明,单斜辉石应该是在寄主碱性玄武质岩浆晚期低压下结晶的,可能是碱性玄武质岩浆浅位岩浆房晶出的产物。单斜辉石的结晶温度为1109～1206℃,压力最高为0.6GPa,相当于深部19.8km。栏杆地区钛铁矿含MgO和Cr_2O_3较低,具有富FeO,并含少量MnO的特点,属于含镁锰钛铁矿。两类矿物特征均与典型金伯利岩中的指示矿物不同。  相似文献   

豫西寒武纪叠层石演化特征及其与后生动物的耦合关系     

常玉光  白万备  王敏 《现代地质》2017,31(1):92

作为微生物席建造物的叠层石记录了大量的古环境和古地理信息,在豫西寒武系出露18层叠层石,以宏观和微观沉积特征为基础,依据各组段叠层石丰度(层厚度)和分异度(形态类型)的演化,将豫西寒武纪叠层石划分为6个演化组合。从叠层石组合的微观纹层、微生物化石及其微生物席演化等方面,结合沉积学和生物化石特征,探讨了豫西寒武纪叠层石的幕式演化,分别为微生物岩-叠层石演化幕和微生物岩-灰岩演化幕。以中寒武世灰岩中微生物岩与遗迹化石的密度关系为例,并从整个寒武纪微生物岩与后生动物化石之间关系的角度分析,认为叠层石微生物岩演化与后生动物之间并非只是简单的“此消彼长”,而是一种动态平衡的耦合关系。  相似文献   

Interannual variability of latent and sensible heat fluxes in the South China Sea     

宗海波  刘玉光  修鹏  徐青  荣增瑞 《中国海洋湖沼学报》2010,(1)

The South China Sea (SCS) is significantly influenced by El Nio and the Southern Oscillation (ENSO) through ENSO-driven atmospheric and oceanic changes.We analyzed measurements made from 1960 to 2004 to investigate the interannual variability of the latent and sensible heat fluxes over the SCS.Both the interannual variations of latent and sensible heat fluxes are closely related to ENSO events.The low-pass mean heat flux anomalies vary in a coherent manner with the low-pass mean Southern Oscillation Index ...  相似文献   

用图型聚类法作气温变化趋势的概率预报     

任荣彩  景华  赵玉广  徐宝新 《气象》1999,25(10):27-30

利用相似概率预报原理,通过图型聚类方法制作了河北省分冷暖季节,分辨站点的气温变化趋势的客观概率预报,１９９８年暖季开始试应用,暖季预报的布赖尔等评分结果表明,图型聚类方法是制作气温变化趋势概率的合理可行的方法。  相似文献   

长白山地区近代火山岩的ESR测年研究   总被引：3，自引：0，他引：3  

尹功明  业渝光  万京林  孙瑛杰  陈文寄  刁少波 《地质论评》1999,45(7):287-293

在对火山灾害和潜在危险性评价中火山活动的时代起着极其重要的作用,但是,目前还没有成熟的测年方法能够对年轻火山岩直接定年。本文采用电子自旋共振（ESR）测年方法对年轻火山岩直接测年进行了尝试。所测年轻火山岩石英矿物中没有E信号,有较弱的Ge中心信号,根据Ge中心信号获得了长白山三期近代火山岩的年龄,其中,气象站碱性流纹岩的ESR年龄约3930 a BP,而气象站碱性流纹岩之下粗面岩的ESR年龄约为17500～20900 a BP。  相似文献   

山东省海洋渔业结构调整研究   总被引：1，自引：0，他引：1  

高清廉  邱天霞  宋协法  焦志刚  周玉光  季万方  辛荣民 《中国海洋大学学报(自然科学版)》1999,(2)

在对山东省海洋渔业现状进行了全面调查、研究与分析的基础上,用灰色模型理论,模拟预测山东省渔业发展的特性与趋势;运用平衡产量和经济模型分别评估了山东省海洋捕捞的最高持续渔产量与最大持续经济产量及其相应努力量;运用线性规划的理论与方法,测算了各档次渔船的功率和船只匹配的优化估算值。依据该数值模型所作的评估结果,提出了对山东海洋渔业结构的调整意见。  相似文献