随机海浪的列率谱分析研究     

孙孚  张书文 《海洋与湖沼》2001,32(5):547-550

首次将列率谱分析的方法引入到随机海浪的研究。根据不同环境条件下实验室资料，对列率谱与频率谱进行了比较。结果表明，列率频对频率谱高频部分有明显改善，特别对二倍频含能段的分辨具有明显的优越性。另外，列率谱具有计算速度快、简单易行、分辨率高等优点。  相似文献   

PROPAGATION AND TRANSFORMATION OF NON-LINEAR WAVES ON UNIFORMLY SLOPING BEACHES Ⅰ. A SOLUTION FOR NON-LINEAR PROGRESSING WAVES     

孙孚 《海洋学报(英文版)》1987,6(1):8-19

Two-dimensional non-linear hydrodynamical equations are solved by using perturbation method and treating slopping beaches as bottom boundary conditions so that a kind of solution for nonlinear progressing waves is obtained. The first order of approximation is the same potential function as used by Biesel, and the second order is calculated numerically. Based on the solution, wave characteristics before breaking, especially the wave set-down, are discussed. It turns out that for the whole course of waves propagating from deep to shallow waters the theory proposed in this paper has a wider valid range of application than others.  相似文献   

Scaling analysis of deposition from turbidity currents   总被引：3，自引：0，他引：3  

L.?Srivatsan  Larry?W.?Lake  Roger?T.?BonnecazeEmail author 《Geo-Marine Letters》2004,24(2):63-74

Many oil-bearing sedimentary deposits are formed by the settling of particles from turbidity currents. Modeling sedimentary processes that form these turbidites enables the calculation of properties such as extent, depth, porosity and permeability of hydrocarbon-bearing reservoirs. This paper estimates the extent and thickness of turbidites from the initial conditions of the turbidity flow. This is achieved by the application of scaling analysis of the partial differential equations that govern the dynamics of and deposition from turbidity currents. We apply the results of scaling analysis to five modern submarine fans. The predicted and actual values of the dimensions of the fan deposits match well. We then compare the derived results against tabulated sizes of ancient turbidites. The comparisons are good as long as we correctly identify the flow regimes in which the deposition took place. The good agreements observed in the two cases show that the estimates obtained using scaling analysis can provide useful first-guess values for the dimensions of the deposits.  相似文献   

中国沿岸水域养殖贝类及其养殖笼网污损苔虫7新种     

刘会莲  刘锡兴  孙松 《海洋科学集刊》2003,(45):202-222

拟小孔苔虫属Microporella和斑孔苔虫属Fenestrulina均隶于唇口目Cheilostomida有囊亚目Ascophorina皮壳次目 Lepraliomorpha裂孔超科Schizoporelloidea拟小孔苔虫科Microporellidae。这两个属的主要区别在于：拟小孔苔虫属具有鸟头体，而斑孔苔虫属无鸟头体。我们在研究中国沿岸水域养殖贝类及其养殖笼网的污损苔虫时发现，中国一些学者以前所报道的“纤毛拟小孔苔虫”并非 Pallas(1766)所鉴定的种，而是包括不同于纤毛拟小孔苔虫Microporella ciliata Pallas，1766的5个不同的独立种，即本文所描述的拟小孔苔虫属的5个新种：空穴拟小孔苔虫 Microporella vacuatus sp.nov.、小筛网拟小孔苔虫Microporella cribellata sp.nov.、无齿拟小孔苔虫Microporella inermis sp.nov.、异北方拟小孔苔虫 Microporella antiborealis sp.nov.和项链拟小孔苔虫 Microporella monilifera sp.nov.。这5个新种与纤毛拟小孔苔虫的主要区别是:5新种的口刺为2~6根，除无齿拟小孔苔虫的口上卵胞仅具一列边缘孔外，其他4新种卵胞前表面还有分散的穿孔；而纤毛拟小孔苔虫的口刺为6根，口上卵胞细颗粒状，无穿孔。研究中我们还发现前人所定名为“马氏斑孔苔虫”的种并非 Audouin(1826)所描述的种，而是4种不同于马氏斑孔苔虫 Fenestrulina mallusii Audouin，1826的独立种，其中两种不属于污损苔虫的范畴，另外的两种即本文所描述的斑孔苔虫属的两新种，即中华斑孔苔虫Fenestrulina Sinica sp.nov.和东方斑孔苔虫Fenestrulina orientalis sp.nov.。这两个新种与马氏斑孔苔虫的主要区别在于：两新种口刺均为4~6根，受孕个虫有2根裸露的口刺；而马氏斑孔苔虫的口刺为2~3根，受孕个虫无裸露的口刺。  相似文献   

三疣梭子蟹全人工工厂化育苗技术     

孙玉忠  王雪梅  宋全山  王玉华  王磊 《海洋湖沼通报》2002,(3):76-79

2000年笔者在日照市水产研究所利用1450m^3水进行梭子蟹全人工工厂化育苗生产，共出Ⅱ-Ⅲ期幼蟹512．7万只，创造了出苗量为3500只／m^3，总产值为150多万元的直接经济效益，同时对幼体培育的密度进行了初步试验，结果表明：从Z1至M期幼体培育密度10－15万／m^3为宜，M期以后密度以0．8－1．5万／m^3为宜。  相似文献   

高分辨率遥感技术在厦门海湾生态环境调查中的应用   总被引：5，自引：0，他引：5  

林桂兰  孙飒梅  曾良杰  庄世坚 《台湾海峡》2003,22(2):242-247,T003

对于局部区域研究，高分辨率卫星遥感及其影像的智能化处理技术是获取信息的新手段．本文以IKONOS遥感影像在厦门海湾的应用为例，探讨高分辨率遥感卫星影像应用于海湾生态环境调查与分析的应用技术．通过分析高分辨率影像地物特征，提出高分辨率遥感影像的重要处理技术：采用不同缩放尺度进行分类和利用空间特征及纹理结构进行专题信息提取。  相似文献   

桶形基础平台三维有限元稳定性分析     

钱荣  周锡礽  孙克俐  张伟 《海洋技术学报》2003,22(4):49-53

以我国第一座桶形基础采油平台工程实例为原型，采用三维有限元计算方法对桶形基础稳定性分析。平台在波浪、风等荷载作用下，其稳定性不仅与平台的整体结构有关，而且与桶形基础及其周围土体相互作用相关。在计算中，利用薄层摩擦单元模拟土与结构间的相互作用，取得了很好的效果。分析结果表明桶形基础采油平台在设计条件下运行是较为稳定的。  相似文献   

黄河入海口壬基酚污染分布特征   总被引：2，自引：0，他引：2  

孙培艳  李正炎  王鑫平  崔文林  傅明珠 《海岸工程》2007,26(3):17-22

黄河口表、底层水体和沉积物中壬基酚的浓度分布特征研究结果表明,表层水体中壬基酚浓度为15.7~148.6 ng/L,平均值为47.5 ng/L;底层水体中壬基酚浓度为15.8~52.7ng/L,平均值为31.0 ng/L;表层沉积物中壬基酚浓度为2.31~5.47 ng/g,平均浓度为3.87ng/g。黄河口水体中壬基酚浓度呈现由河道向出海口外逐渐降低的趋势;河道中表层沉积物壬基酚含量高于出海口外。黄河口水体中壬基酚浓度低于文献中报道的海河口水体中的浓度,表层沉积物中壬基酚含量低于珠江口文献报道值。水体中壬基酚浓度超过抑制藤壶附着浓度(10 ng/L),河道最上游的站点水体中的浓度超过影响太平洋牡蛎幼苗的发育并增加幼苗死亡率的浓度(100 ng/L)。  相似文献   

Preliminary study on different nutrient pools supplies for the phytoplankton growth in the Jiaozhou Bay in China in the fall of 2004     

WANG Dan  SUN Jun  SONG Shuqun  LUAN Qingshan  Joey McMurdie 《海洋学报(英文版)》2007,26(3):110-120

The source and significance of two nutrients, nitrogen and phosphorous, were investigated by a modified dilution method performed on seawater samples from the Jiaozhou Bay, in autumn 2004. This modified dilution method accounted for the phytoplankton growth rate, microzooplankton grazing mortality rate, the internal and external nutrient pools, as well as nutrient supplied through remineralization by microzooplankton. The results indicated that the phytoplankton net growth rate increased in turn from inside the bay, to outside the bay, to in the Xiaogang Harbor. The phytoplankton maximum growth rates and microzooplankton grazing mortality rates were 1.14 and 0.92 d-1 outside the bay, 0.42 and 0.32 d-1 inside the bay and 0.98 and 0.62 d-1 in the harbor respectively. Outside the bay, the remineralized nitrogen (Kr=24.49) had heavy influence on the growth of the phytoplankton. Inside the bay, the remineralized phosphorus(Kr=3.49) strongly affected the phytoplankton growth. In the harbor, the remineralized phosphorus (Kr=3.73) was in larger demand by phytoplankton growth. The results demonstrated that the different nutrients pools supplied for phytoplankton growth were greatly in accordance with the phytoplankton community structure, microzooplankton grazing mortality rates and environmental conditions. It is revealed that nutrient remineralization is much more important for the phytoplankton growth in the Jiaozhou Bay than previously believed.  相似文献   

唐山市滨海湿地动态演变特征及其机制分析     

邱若峰  杨燕雄  刘松涛  周振祥  孙娟 《海洋湖沼通报》2006,(4):25-31

利用历史资料和Landsat TM卫星遥感图像,研究了唐山市滨海湿地自建国以来的演变特征,着重对1987~2004年陡河———滦河之间的滨海平原湿地类型进行了识别,绘制了不同时期的景观面解译图。利用Mapinfo制图软件计算出两个时期的面积(比例)转化矩阵,显示该区滨海湿地破碎化加重,其动态演变特征呈明显退化趋势,进而提出引起其退化的原因和发展趋势预测。  相似文献