A method of determining dominant wave direction from multiparameter hydrological gauge measurements and its application     

WANG Sheng''an  LONG Xiaomin  ZHANG Keben  CHEN Junchang  ZHANG Wenjing  CAI Shuqun 《海洋学报(英文版)》2007,26(3):160-166

Multi-parameter hydrological gauge is an instrument developed by the South China Sea Institute of Oceanology,the Chinese Academy of Sciences to make simultaneous observation of current, wave, tide, water temperature and conductivity.By using the well-known "PUV method", the directional wave spectrum can be calculated and the dominant wave direction is then obtained.The comparison of the dominant wave directions derived from the measurements using both the multi-parameter hydrological gauge and the MARK Ⅱ "Wave-Rider" directional buoy shows that the dominant wave directions derived from the two kinds of measurements are in good agreement.  相似文献   

Fluctuations of peak energy and peak frequency of local wavelet energy spectrum for wind waves     

Wu Kejianl  Lou Shunli 《海洋学报(英文版)》1997,16(4):429-439

Ｆｌｕｃｔｕａｔｉｏｎｓ　ｏｆ　ｐｅａｋ　ｅｎｅｒｇｙ　ａｎｄ　ｐｅａｋ　ｆｒｅｑｕｅｎｃｙ　ｏ　ｌｏｃａｌ　ｗａｖｅｌｅｔ　ｅｎｅｒｇｙ　ｓｐｅｃｔｒｕｍ　ｆｏｒ　ｗｉｎｄ　ｗａｖｅｓTXＦｌｕｃｔｕａｔｉｏｎｓｏｆｐｅａｋｅｎｅｒｇｙａｎｄｐｅａｋ...  相似文献   

双峰谱型海浪的波高和周期分布     

陈雪英 《海洋科学进展》1996,(2)

本文利用收集到的实测双峰谱型海浪过程资料，把这些资料以波高和周期的相关系数为参数分成５组，讨论每组双峰谱型下被高、周期的统计分布．并探讨了相关系数对波高分布和周期分布的影响。  相似文献   

江苏岸外辐射沙脊群东沙稳定性研究   总被引：8，自引：0，他引：8  

陈君  王义刚  张忍顺  林祥 《海洋工程》2007,25(1):105-113

东沙是江苏岸外辐射沙脊群中的第二大沙洲,具有独特的地形地貌和水动力条件,对它进行稳定性研究为揭示整个辐射沙洲及其邻近岸滩的动态演变都非常有益。通过利用多年遥感卫片资料、1998年取得的现场水文泥沙观测资料和东沙滩面表层沉积物资料等,对东沙的地形地貌特征、沉积特征和东沙两侧潮汐通道的水流泥沙特征等进行了详细分析。研究结果表明,东沙的沙脊偏于西侧,西侧滩面较窄、高程较高且岸线较为顺直,东侧滩面较宽、高程较低且岸线较为破碎;西洋和陈家坞槽均处于冲刷状态,净输沙的主要方向为输向槽外或输向条子泥;东沙近三十年来面积有所缩小且有外围向中央收缩的趋势,尤其以向东、向南方向的迁移最为明显。  相似文献   

A proposed directional function and wind-wave directional spectrum   总被引：4，自引：0，他引：4  

Wen Shengchang  Wu Kejian  Guan Changlong  Sun Shicai  Zhang Dacuo 《海洋学报(英文版)》1995,14(2):155-166

Ａｐｒｏｐｏｓｅｄｄｉｒｅｃｔｉｏｎａｌｆｕｎｃｔｉｏｎａｎｄｗｉｎｄ－ｗａｖｅｄｉｒｅｃｔｉｏｎａｌｓｐｅｃｔｒｕｍ￥ＷｅｎＳｈｅｎｇｃｈａｎｇ；ＷｕＫｅｊｉａｎ；ＧｕａｎＣｈａｎｇｌｏｎｇ；ＳｕｎＳｈｉｃａｉａｎｄＺｈａｎｇＤａｃｕｏ（Ｒｅｃｅｉ...  相似文献   

Outer wave number spectrum and statistical distribution of apparent wave number vector     

J. -B. Song  K. -J. Wu  Y. -H. Wu 《Ocean Engineering》2003,30(3):401-412

Based on the ray theory and Longuet-Higgins’s linear model of sea waves, the joint distribution of wave envelope and apparent wave number vector is established. From the joint distribution, we define a new concept, namely the outer wave number spectrum, to describe the outer characteristics of ocean waves. The analytical form of the outer wave number spectrum, the probability distributions of the apparent wave number vector and its components are then derived. The outer wave number spectrum is compared with the inner wave number spectrum for the average status of wind-wave development corresponding to a peakness factor P = 3. Discussions on the similarity and difference between the outer wave number spectrum and inner one are also presented in the paper.  相似文献   

海洋微藻多糖微波提取法研究   总被引：1，自引：0，他引：1  

刘四光  李文权  邓永智 《海洋通报》2007,26(4):105-110

选取自养小球藻(Chlorella autotrophica)为实验材料,采用微波法提取多糖,以温度、时间、pH以及微波功率4个因子建立正交实验,考察单因素影响情况。实验结果表明,在温度70℃、时间30min、pH为7、功率为600W条件下粗多糖的产率最高,为291.13mg/g(粗多糖/干重),远高于传统热水浸提法所得粗多糖产率(78.52mg/g,粗多糖/干重),且所得粗多糖与热水浸提法获得的粗多糖具有相似的红外光谱。说明,在一定的实验条件下,与热水浸提法相比,微波提取法不仅不会破坏多糖的结构,还有耗时短、有较高的多糖产率的优势。  相似文献   

Investigation of the hydrate reservoir production under different depressurization modes     

Zhizeng Xia  Xuewu Wang  Xiaohua Zhang 《Marine Georesources & Geotechnology》2020,38(8):1002-1012

Abstract

Large reserves of natural gas hydrates exist, and the depressurization method has the greatest potential for gas hydrate reservoir recovery. Currently, the most commonly adopted depressurization simulation method is a constant bottom-hole pressure production scheme. This study proposes a new depressurization mode with decreasing bottom-hole pressure. The production characteristic was numerically investigated using this method. The results show the following: (1) As the depressurization exponent (n) decreases, the development effect improves, and production indexes including cumulative gas production/dissociation and gas-water ratio increase. However, the reservoir energy consumption is higher and the hydrate reformation is more severe. (2) Compared to the proposed depressurization mode, the hydrate production index of the constant bottom-hole pressure production (n?=?0) is better. However, the hydrate reservoir energy consumption is higher and the hydrate reformation is more severe using constant bottom-hole pressure production. (3) To achieve a balance between production and reservoir energy consumption during depressurization production, the bottom-hole pressure should be controlled by selecting a suitable depressurization exponent between n_min and n_max, which can be determined through numerical simulations.  相似文献   

Stochastic Response Analysis of Piled Offshore Platform Excited by Stationary Filtered White Noise     

Luo Chuanxin Wu Zhiping Professor 《中国海洋工程》1997,(1)

In this paper,the analysis method of stochastic response of piled offshore platform excited bystationary filtered white noise is presented.With this method,the strong ground motion is considered asthree direction stationary filtered white noise process,the theoretic solutions of three special integrationequations are derived with the residue theorem,and the expression of response nodal displacements andmember forces of offshore platform excited by the stationary filtered white noise is put forward.Thestochastic response of a piled offshore platform excited by the stationary filtered white noise,which is lo-cated 114.3m in water depth,is computed.The results are compared with those obtained with the re-sponse spectrum analysis method and the stationary white noise model analysis method,and the corre-sponding conclusion is drawn.  相似文献   

南黄海陆架中部沉积物反射率光谱的影响因素分析     

王昆山  石学法  程振波  王国庆  葛淑兰 《海洋科学进展》2007,25(1):46-53

利用Minolta CM-2002光谱光度计对南黄海陆架136个短柱样品20~25cm段的沉积物进行了颜色反射率数据测量,通过化学元素、粒度、磁化率等来确定影响沉积物颜色反射率变化的成分和因素,介绍了反射率光谱的一阶导数和因子分析的方法。分析结果表明,南黄海陆架沉积物颜色反射率受控于沉积物中的铁氧化物、有机质以及粘土矿物和钙质生物碎屑含量。主因子F1指示氧化环境,并与陆源物质相关,F2指示弱氧化环境,F3指示弱还原环境,主因子的波长范围分别是405~445 nm和495~595 nm,605~695 nm,445~485 nm。  相似文献