On tectonic movement in the South China Sea during the Cenozoic   总被引：1，自引：1，他引：0  

LIN Changsong  CHU Fengyou  GAO Jinyao  TAN Yonghua 《海洋学报(英文版)》2009,28(1):25-36

The tectonic movement taking place at the end of Cretaceous and the beginning of Cenozoic had opened the Cenozoic phase of polycyclic tectonic movements, then the whole crust of the South China Sea had been mainly subjected to the regional stress field of tectonic tension, which was characterized by rifting depression. Seven times of regional tectonic movement and sedimentation had been assembled into a geological development history of polycyclic oscillation. Especially, the tectonic movements were strongly intensified at the end of Cretacious and the beginning of Paleagene, between Late Eocene and MidOligocene, during Mid and Late Miocene. These three times of tectonic movement had built the most important regional tectonic interfaces in the South China Sea. Crust movements of the South China Sea were the result and epitome of interaction of the Eurasia, Pacific and IndoAustralia plates, that is, they were introduced by polycyclic changes of directions, rates and strengths of lithospheric movements and asthenospheric flows across the Pacific and IndoAustralia plates.  相似文献   

多尺度带乘性噪声系统的最优状态平滑算法     

褚东升  于春晓  吴昊罡 《中国海洋大学学报(自然科学版)》2008,38(1):139-142

针对多尺度带乘性噪声系统,在多尺度最优滤波融合的基础上,进行状态最优固定域平滑算法的研究.通过推广得到的平滑算法需要大量的局部传感器参数,而分布式多尺度滤波融合后不能保留这些信息.针对这一弊端对算法进行改进,推导出仅使用融合后的一步预测及滤波值的平滑算法.该算法在线性最小方差意义下是最优的.计算机仿真验证了算法的可行性.  相似文献   

Thermal fronts and cross-frontal heat flux in the southern Huanghai Sea and the East China Sea   总被引：1，自引：0，他引：1  

PARK Sunghye  CHU Peter C 《海洋学报(英文版)》2008,27(5):1-20

Synoptic features in/around thermal fronts and cross-frontal heat fluxes in the southern Huanghai./Yellow Sea and East China Sea （HES） were examined using the data collected from four airborne expendable bathythermograph surveys with horizontal approxmately 35 km and vertical 1 m（from the surface to 400 m deep） spacings. Since the fronts are strongly affected by HES current system, the synoptic thermal features in/around them represent the interaction of currents with surrounding water masses. These features can not be obtained from climatological data. The identified thermal features are listed as follows ： （ 1 ） multiple boundaries of cold water, asymmetric thermocline intrusion, locally-split front by homogeneous water of approxmately 18 ℃, and mergence of the front by the Taiwan Warm Current in/around summertime southern Cheju - Changjiang/Yangtze front and Tsushima front; （2） springtime frontal eddy-like feature around Tsushima front; （3） year-round cyclonic meandering and summertime temperature-inversion at the bottom of the surface mixed layer in Cheju - Tsushima front; and （4） multistructure of Kuroshio front. In the Kuroshio front the mean variance of vertical temperature gradient is an order of degree smaller than that in other HES fronts. The southern Cheju- Changjiang front and Cheju -Tsushima front are connected with each other in the summer with comparable cross-frontal temperature gradient. However, cross-frontal heat flux and lateral eddy diffusivity are stronger in the southern Cheju - Changjiang front. The cross-frontal heat exchange is the largest in the mixing zone between the modified Huanghai Sea bottom cold water and the Tsushima Warm Current, which is attributable to enhanced thermocline intrusions.  相似文献   

因子克里格分析支持的重金属元素空间多尺度变化特征——以北部湾东北部海域为例   总被引：1，自引：0，他引：1  

赵建如  初凤友  金翔龙  吴清松  杨克红  葛倩  金路 《海洋学报(英文版)》2015,34(12):137-146

将因子克里格分析方法应用于海底沉积物重金属元素空间多尺度变化的研究中,分析了北部湾东北部表层沉积物中7种重金属元素,Ni、Cu、Zn、Pb、Cr、As和Cd的空间多尺度结构特征,识别并分离了重金属元素不同尺度的空间变化,并探讨了各个尺度上重金属的物源及控制因素。结果显示,研究区重金属存在块金效应、变程为30km的球状结构(短变程尺度)和变程为140km的球状结构(长变程尺度)等三种尺度的空间结构,并拟合了研究区7种重金属元素的线性协同区域化模型。短变程尺度上,7种重金属元素的空间分布表现为"点状"或"条带状"的局部尺度的空间变化特征;长变程尺度上,7种重金属元素的空间分布反映出"片状"的区域尺度的空间变化特征。局部尺度上,Zn、Cr、Ni、Cu、Pb和Cd等元素主要源于海南岛、雷州半岛、广西大陆等陆地母岩物质,其空间分布特征受到了沉积物粒度的控制作用;而As主要受到海南岛、雷州半岛的人为污染成分的影响。区域尺度上,Zn、Cr、Ni和Cu主要来源于雷州半岛、海南岛的母岩物质,其次为广西大陆;As主要来源于海南岛的母岩物质,其次为雷州半岛、广西大陆。这些重金属元素在北部湾终年逆时针大环流的控制下,进行搬运、迁移并沉积在"汇聚中心",形成了研究区重金属元素区域尺度上NWW-NNW向的分布格局;而As不同于其他元素的亲陆的NNW向分布特征,主要源于其不同的地球化学行为。  相似文献   

一种高频雷达回波谱反演海浪的新算法     

常广弘  黎明  楚晓亮  纪永刚  于长军 《中国海洋大学学报(自然科学版)》2015,45(2):127-133

在高频地波雷达海浪谱反演问题中,广泛采用的Barrick后向散射公式属于第一类非线性Fredholm积分方程。此类积分方程的解在本质上是不适定的,加之高频雷达二阶回波信号信噪比较低,使得反演海浪谱存在解不稳定的问题。本文提出一种稳定且低复杂度的反演算法,此算法首先根据高频雷达一阶回波谱测量海浪方向,并将其引入积分方程求解过程,减少求解变量的个数,降低反演算法的复杂度。为解决反演结果不稳定的问题,使用Tikhonov正则化方法并利用广义交叉验证法(GCV)确定其正则化系数。通过在不同测试条件下对反演算法的仿真测试分析,表明此方法具有运算量小、稳定性好的特点。  相似文献   

基于三轴加速度的波浪测量技术研究     

赵杰  惠力  初士博  盖志刚  朱洪海  杨俊贤  王志 《海洋技术学报》2015,34(5):66-70

以浮标为载体,以TMS320C6416型DSP处理器、三轴加速度传感器、电子罗盘为硬件电路核心,利用加速度频域二次积分的波高计算方法以及三轴加速度倾角补偿电子罗盘的波向测量方式,进行海洋波浪要素测量技术研究,获取了某一海域不同时段的波浪特征值。  相似文献   

Composition and Origin of Ferromanganese Crusts from Equatorial Western Pacific Seamounts     

WANG Guozhi  JANSA Luba  CHU Fengyou  ZOU Can  SUN Guosheng 《中国海洋大学学报(英文版)》2015,(2):217-227

In the equatorial western Pacific, iron-manganese oxyhydroxide crusts(Fe-Mn crusts) and nodules form on basaltic seamounts and on the top of drowned carbonate platform guyots that have been swept free of pelagic sediments. To date, the Fe-Mn crusts have been considered to be almost exclusively of abiotic origin. However, it has recently been suggested that these crusts may be a result of biomineralization. Although the Fe-Mn crust textures in the equatorial western Pacific are similar to those constructed by bacteria and algae, and biomarkers also document the existence of bacteria and algae dispersed within the Fe-Mn crusts, the precipitation, accumulation and distribution of elements, such as Fe, Mn, Ni and Co in Fe-Mn crusts are not controlled by microbial activity. Bacteria and algae are only physically incorporated into the crusts when dead plankton settle on the ocean floor and are trapped on the crust surface. Geochemical evidence suggests a hydrogenous origin of Fe-Mn crusts in the equatorial western Pacific, thus verifying a process for Fe-Mn crusts that involves the precipitation of colloidal phases from seawater followed by extensive scavenging of dissolved trace metals into the mineral phase during crust formation.  相似文献   

结合地理空间数据的输电线路通道潜在滑坡体稳定性评价     

王景致  尹海兵  袁嘉彬  初金良  高磊 《测绘与空间地理信息》2021,44(5):31-35

输电线路常需要通过地质灾害危险区域,对输电线路通道所经区域的潜在滑坡体进行稳定性分析及安全评价具有重要意义.本文基于直升机扫描LiDAR DEM和DOM数据,利用地理空间信息处理技术和有限元强度折减法分析,对某输电线路通道潜在滑坡安全隐患的边坡进行了分析计算.首先对输电线路通道原始扫描数据进行处理,提取滑坡体参数,再通过有限元软件建立滑坡体的三维地质模型;然后,利用强度折减法对潜在滑坡体进行自然、暴雨工况下的数值模拟和稳定性计算,求出滑坡体的安全系数,获得滑坡体应力、应变和位移云图,综合评价线路通道潜在滑坡体的稳定状态,为输电线路电力设施通道滑坡灾害防治安全设计和施工提供科学依据.  相似文献   

基于珞珈一号与DMSP/OLS数据的辽宁省城市空间扩张分析     

孟静  魏悦  褚光辉 《测绘与空间地理信息》2021,44(4):151-154

基于珞珈一号和DMSP/OLS夜间灯光数据,提取辽宁省城市空间用地信息并监测分析了2003—2018年城市空间扩张特征。结果表明:1)利用辽宁省DMSP/OLS长时间序列夜间灯光数据提出了一种适合校正长时间序列DMSP/OLS数据的校正方法,提高了数据的连续性和可对比性;2)弥补了统计数据在空间属性的不足,消除了过去单纯依靠统计数据分析城市空间扩张的弊端,为其他省市分析城市扩张提供新的遥感监测分析方法;3)在2003—2018年间,辽宁省城市空间扩张存在城市空间扩张与南方省份相比发展比较缓慢及协调性欠佳等问题。  相似文献   

融合CORS的自然资源移动调绘系统设计与实现     

周烽松  敖敏思  楚彬  华亮春 《测绘地理信息》2021,46(6):142-145

针对自然资源外业调绘过程采集数据精度低、工作效率低等缺点,设计并实现了融合CORS(continuously oper-ating reference stations)和无人机的外业调绘系统.详细介绍了系统的整体设计与功能,实现了在高精度影像底图上对图斑进行合并、切割、注记、高精度定位等功能.推进自然资源要素移动化、智能化调查取证,降低外业调绘工作量和工作风险,具有一定的推广与应用价值.  相似文献