验后平差方法在Geosat/GM卫星测高数据处理中的应用   总被引：1，自引：0，他引：1       下载免费PDF全文

刘传勇  暴景阳  黄谟涛  欧阳永忠  陆秀平  李春菊  张献 《海洋测绘》2008,28(1):5-8

为了消除多代卫星测高数据之间的不协调性,利用两步处理法对Geosat/GM正常点海面高数据进行自交叉点平差及与T/P卫星测高数据联合平差,发现误差模型的系数计算出现异常,通过分析误差模型及正常点海面高数据的分布特征,找出了出现异常的原因,对计算方法进行改进后,大大提高了计算结果的稳定性和可靠性。  相似文献   

茂名大放鸡海域文昌鱼、蛇尾分布及其与底质粒度特征的关系     

卢伙胜  沈春燕  冯波 《中国海洋大学学报(自然科学版)》2008,38(2):297-302

为给茂名市建设文昌鱼省级自然保护区提供基础资料,根据2003年8月～2004年5月间对茂名大放鸡海域的调查结果,对文昌鱼和蛇尾的分布特性进行了研究.结果表明:文昌鱼和蛇尾均呈集群分布,在空间分布上表现为正相关关系,不存在强烈的竞争关系.文昌鱼主要分布在中值粒径MdΦ为0.4～2.2之间砂质中.在0.5≤MdΦ＜1.5范围内,文昌鱼分布密度相对地高,而在MdΦ＜0.5或MdΦ≥1.5范围内,文昌鱼分布密度相对较低.粒径0.36～0.78 mm组分＜50%时,文昌鱼分布密度≤50 ind/m2;粒径0.36～0.78 mm组分≥50%时,文昌鱼分布密度＞100 ind/m2.蛇尾分布在中值粒径MdΦ为0.2～0.8之间砂质中.粒径 0.36～0.78 mm组分占10%～50%时,蛇尾分布密度较低,而粒径0.36～0.78 mm组分占60%～80%时,蛇尾分布密度较高.  相似文献   

一种针对规则冲突的规则集语义比较算法     

李林  卢显良  徐海湄  李泽平  李梁 《中国海洋大学学报(自然科学版)》2008,(Z1)

应用DFD(Diverse Firewall Design)方法进行防火墙规则集设计时,需使用规则集语义比较算法,判断多个规则集是否语义一致。规则冲突是导致规则集语义不一致的主要原因。因此,需要研究针对规则冲突的规则集语义比较算法。而现有算法时空复杂度较高,性能低下。文中提出了1种基于关键数据包选取映射的规则集语义比较算法(KPCM)。KPCM算法针对规则冲突选取关键数据包,并通过比较这些数据包在不同规则集中的处理动作,判断这些规则集是否语义一致。理论分析和测试表明,KPCM算法时空性能均优于现有算法。  相似文献   

Molecular phylogenetic analysis of attached Ulvaceae species and free-floating Enteromorpha from Qingdao coasts in 2007   总被引：3，自引：1，他引：2  

姜鹏  王金锋  崔玉琳  李友训  林瀚智  秦松 《中国海洋湖沼学报》2008,26(3)

Based on the sequence data of the nuclear ribosomal DNA internal transcribed spacer(ITS) 1,5.8 S,and ITS 2,the molecular phylogeny was analyzed on Ulvaceae species collected from Qingdao coasts in summer of 2007,including 15 attached Ulva and Enteromorpha samples from 10 locations and 10 free-floating Enteromorpha samples from seven locations.The result supported the monophyly of all free-floating Enteromorpha samples,implying the unialgal composition of the free-floating Enteromorpha,and the attached Ulvaceae species from Qingdao coasts were grouped into other five clades,suggesting that they were not the biogeographic origin of the free-floating Enteromorpha in that season.  相似文献   

pCO2 and carbon fluxes across sea-air interface in the Changjiang Estuary and Hangzhou Bay   总被引：1，自引：0，他引：1  

高学鲁  宋金明  李学刚  李宁  袁华茂 《中国海洋湖沼学报》2008,26(3)

Partial pressure of CO2(pCO2) was investigated in the Changjiang(Yangtze River) Estuary,Hangzhou Bay and their adjacent areas during a cruise in August 2004,China.The data show that pCO2 in surface waters of the studied area was higher than that in the atmosphere with only exception of a patch east of Zhoushan Archipelago.The pCO2 varied from 168 to 2 264 μatm,which fell in the low range compared with those of other estuaries in the world.The calculated sea-air CO2 fluxes decreased offshore and varied from -10.0 to 88.1 mmol m-2 d-1 in average of 24.4 ± 16.5 mmol m-2 d-1.Although the area studied was estimated only 2 × 104 km2,it emitted(5.9 ± 4.0) × 103 tons of carbon to the atmosphere every day.The estuaries and their plumes must be further studied for better understanding the role of coastal seas playing in the global oceanic carbon cycle.  相似文献   

Rossby waves with linear topography in barotropic fluids   总被引：1，自引：0，他引：1  

杨联贵  达朝究  宋建  张会琴  杨红丽  侯一筠 《中国海洋湖沼学报》2008,26(3):334-338

Rossby waves are the most important waves in the atmosphere and ocean, and are parts of a large-scale system in fluid. The theory and observation show that, they satisfy quasi-geostrophic and quasi-static equilibrium approximations. In this paper, solitary Rossby waves induced by linear topography in barotropic fluids with a shear flow are studied. In order to simplify the problem, the topography is taken as a linear function of latitude variable y, then employing a weakly nonlinear method and a perturbation method, a KdV （Korteweg-de Vries） equation describing evolution of the amplitude of solitary Rossby waves induced by linear topography is derived. The results show that the variation of linear topography can induce the solitary Rossby waves in barotropic fluids with a shear flow, and extend the classical geophysical theory of fluid dynamics.  相似文献   

Environmental evolution of Gongwang Mountains during Holocene in northeastern Yunnan, China     

Wei ZHANG  Chuanchuan LI  Zhijiu CUI  Jinliang FENG . College of Urban  Environmental Sciences  Liaoning Normal University  Dalian  Liaoning  China. College of Environmental Sciences  Peking University  Beijing  China 《东北亚地学研究》2008,11(3):156-167

This paper presents the study on two continuous glacio-lacustrine sedimentary deposits, Laotanfang （3 597 m） and Shibantang （3 689 m） located on the southern and northern sides of Hulifang peak in Yunan, China. Environmental change indexes are constructed for each deposit, based on grain size, geochemical and pollen analysis, environmental magnetic susceptibility, and 14C dating. The study of climatic environmental change since the Holocene epoch in this region shows that the climate fluctuated at different stages during the early Holocene, that is, the climate was cool and wet during 8.4-7. 7r ka, cold and wet during 7.7-6. 5 ka, cold and dry during 6. 5-4.7 ka, cool and wet during 4.7-2. 1 ka, warm and wet during 2. 1-1.0 ka, and warmer and wet since 1 ka. These findings reflect the overlapping influences of the southwest and southeast monsoons in different times during the Holocene in the north part of southwestern China are in accord with other Holocene climate change models in this part of China.  相似文献   

Isotopic tracing of ore-forming source materials for Dexing porphyry copper deposit of Jiangxi, China     

References： 《东北亚地学研究》2008,11(1):25-31

Dexing copper deposit is the biggest porphyry copper deposit in China. By researching isotopes of C, Si and Cu from the samples of Tongchang and Fujiawu ore-field, the authors found that δ^13 CpDB values of siderite were close to the δ^13 CpDB value of original magma; δ^30Si values of the samples at the ore-forming stage were close to the δ^30 Si value range of magma, δ^30Si values of partial samples were far away from it; Cu isotopic compositions of massive chalcopyrite formed at the early ore-forming stage are higher than that of veinal chalcopyrite formed at the later ore-forming stage. The results show that ore-forming materials were mainly derived from the porphyry body, and part of them were from wall rock materials.  相似文献   

Numerical simulation research on multi-electrodes resistivity imaging survey array     

Jianjun NIU  Xiaopei ZHANG  Lizhi DU College of Construction Engineering  Jilin University  Changchun  China 《东北亚地学研究》2008,11(4):232-236

Multi-electrodes Resistivity Imaging Survey （MRIS） is an array method of electrical survey. In practice how to choose a reasonable array is the key to get reliable survey results. Based on four methods of MRIS such as Wenner, Schlumberger, Pole-pole and Dipole-dipole the authors established the model, by studying the result of the forward numerical simulation modeling and inverse modeling, and analyzed the differences among the different forms of detection devices.  相似文献   

基于弧段标记的交通网络时间最短路径算法   总被引：2，自引：0，他引：2  

高松  陆锋 《地球信息科学学报》2008,10(5):604-610

标号算法是经典的最短路径算法之一,在交通领域中具有广泛的应用。在交通领域中,时间最短路径比距离最短路径更有意义,而时间最短路径不仅与道路的时间权值有关,还与道路之间的转弯阻抗有关。在传统的交通路网抽象方式下,道路抽象为平面图中的弧段,道路间的交叉口抽象为节点。本文介绍了一种适用于传统交通路网模型的弧段标记时间最短路径算法,详细阐述了该算法的原理、数据基础与运行结构。通过分析和实例测试表明,该算法可以顾及城市路网在路口的交通限行与转弯延迟的影响,并且时间复杂度低,具有一定的实际应用价值。  相似文献