浅剖数据解译中淤泥层层界提取方法   总被引：2，自引：0，他引：2  

胡梦涛  蒋廷臣  李佳琦  刘志强  董春来 《测绘通报》2017,(6):72-76

港口与航道淤泥层层界确定对于港航建设开发与工程实施有着重大意义。本文针对港口航道浅地层剖面仪原始采集数据模糊的问题,分析了影响原始数据真实性的主要原因,实施了中值滤波法多次波压制与消噪处理,取得了清晰可靠的真实数据图像文件,根据海底声波不同层界反射特征,对比分析了脉冲信号声强图像变化情况,探讨了基于浅剖数据声强图像提取淤泥层厚的方法。试验证明该方法可以达到当前钻孔资料所能达到的精度范围。  相似文献   

传统填图法在半覆盖区的改进——第四系岩性填图法     

姚春亮  夏庆霖  张晓军  范先旺  覃莹  谭江东 《地球学报》2017,38(4):549-559

传统地质填图方法一般按成因划分第四系填图单位,但在半覆盖区,往往存在第四系不同成因物质混杂堆积的现象,若按成因划分填图单位,则会造成混乱。笔者在填图实践中,尝试按岩性划分第四系填图单位,这一做法能避免这种混乱,且有利于第四系中基岩信息的发掘,并能为勘查地球化学工作提供景观依据,这种新式填图方法可称为"第四系岩性填图法"。用岩性划分第四系填图单位需要使用统一的分类命名方案,本文使用了按碎屑特征进行分类的方案,主要考虑第四系松散堆积中碎屑的粒径、形态和含量变化。第四系岩性填图法中填图单位的划分需要参照这一分类命名方案,并可选用颜色、构造、次要碎屑类型等修饰性要素做为辅助划分依据。填图单位划分一般在踏勘和剖面实测中完成,第四系岩性填图法剖面测制较为复杂,除采用传统垂向测制方法外,还需运用横向测法和横向-垂向联合测法,通过剖面工作,可细化填图单位划分方案,并可评价不同填图单元基岩恢复的可靠性。第四系岩性填图法除需要编制传统地质图外,还需要编制基岩推断地质图或是在报告中制作插图以阐述此成果。  相似文献   

Meso-scale circulation at the intermediate-depth east of Mindanao observed by Argo profiling floats   总被引：1，自引：0，他引：1  

ZHOU Hui  YUAN DongLiang  GUO PeiFang  SHI MaoChong & ZHANG QiLong Key Laboratory of Ocean Circulation  Wave Studies  Chinese Academy of Sciences  Qingdao  China  Physical Oceanography Laboratory  Ocean University of China  Qingdao 《中国科学:地球科学(英文版)》2010,(3)

The meso-scale circulation at the intermediate depth east of Mindanao is studied using Argo profiling floats observations. The trajectories and the parking-depth velocities of Argo floats show that the intermediate-depth circulation east of Mindanao contains significant meso-scale features that are highly variable both in space and in time. Both cyclonic and anticyclonic eddies at the intermediate depth (1000–2000 m) are indicated by the trajectories east of Mindanao. The mean tangential velocities of these eddies are about 10 cm/s at 2000 m and over 20 cm/s at 1000 m, which indicates that the geostrophic calculation may contain large errors due to the vigorous eddy activity at the reference levels. The analyses also suggest that these eddies might play an important role in mass and vorticity balances of the intermediate-depth circulation east of Mindanao.  相似文献   

基于WebGIS的Argo数据共享服务系统          下载免费PDF全文

王帅  徐从富  陈雅芳 《海洋科学》2011,35(3):32-36

为了应对快速增长的 Argo 浮标数据,方便海洋科研人员利用 Argo 数据进行科学研究,使用WebGIS 技术设计了 Argo 数据共享服务系统架构,并根据科研用户需求实现了系统,结果表明:系统可以满足用户需求,具有较高的使用价值.  相似文献   

热带西太平洋海域上层海洋热含量的CSEOF分析   总被引：4，自引：0，他引：4  

吴晓芬  许建平  张启龙  刘增宏 《热带海洋学报》2011,(6)

基于月平均Argo温、盐度剖面、纬向风和Ni o3.4指数等资料,利用循环平稳经验正交函数(CSEOF)分解法、最大熵谱分析和相关分析等方法,研究了热带西太平洋海域上层(0—700m)海洋热含量的时空变化特征,并探讨了其年际变化的可能原因。结果表明,热带西太平洋海域上层海洋热含量距平场具有显著的东-西向反位相振荡,且这种振荡除了具有较明显的季节变化外,还存在着较强的准2a振荡。此外,热含量距平场还存在着负-正-负的三极式经向模态,该模态除了具有明显的季节变化外,还存在着显著的准4a振荡。进一步分析表明,热含量的准2a振荡与ENSO事件的发生有着非常密切的联系,并对赤道西太平洋纬向风异常有1—2月的滞后响应。  相似文献   

Otway Continental Margin Transect: Crustal architecture from wide‐angle seismic profiling across Australia's southern margin     

D. M. Finlayson  I. Lukaszyk  C. D. N. Collins  E. C. Chudyk 《Australian Journal of Earth Sciences》2013,60(5):717-732

The Otway Basin in southeastern Australia formed on a triangular‐shaped area of extended continental lithosphere during two extensional episodes in Cretaceous to Miocene times. The extent of the offshore continental margin is highlighted by Seasat/Geosat satellite altimeter data. The crustal architecture and structural features across this southeast Australian margin have been interpreted from offshore‐onshore wide‐angle seismic profiling data along the Otway Continental Margin Transect extending from the onshore Lake Condah High, through the town of Portland, to the deep Southern Ocean. Along the Otway Continental Margin Transect, the onshore half‐graben geometry of Early Cretaceous deposition gives way offshore to a 5 km‐thick slope basin (P‐wave velocity 2.2–4.6 km/s) to at least 60 km from the shoreline. At 120 km from the nearest shore in a water depth of 4220 m, sonobuoy data indicate a 4–5 km sedimentary sequence overlying a 7 km thick basement above the Moho at 15 km depth. Major fault zones affect the thickness of basin sequences in the onshore area (Tartwaup Fault Zone and its southeast continuation) and at the seaward edge of the Mussel Platform (Mussel Fault). Upper crustal basement is interpreted to be attenuated and thinned Palaeozoic rocks of the Delamerian and Lachlan Orogens (intruded with Jurassic volcanics) that thin from 16 km onshore to about 3.5 km at 120 km from the nearest shore. Basement rocks comprise a 3 km section with velocity 5.5–5.7 km/s overlying a deeper basement unit with velocity 6.15–6.35 km/s. The Moho shallows from a depth of 30 km onshore to 15 km depth at 120 km from the nearest shore, and then to about 12 km in the deep ocean at the limits of the transect (water depth 5200 m). The continent‐ocean boundary is interpreted to be at a prominent topographic inflection point 170 km from shore at the bottom of the continental slope in 4800 m of water. P‐wave velocities in the lower crust are 6.4–6.8 km/s, overlying a thin transition zone to an upper mantle velocity of 8.05 km/s beneath the Moho. Outstandingly clear Moho reflections seen in deep‐marine profiling data at about 10.3 s two‐way time under the slope basin and continent‐ocean boundary place further strong controls on crustal thickness. There is no evidence of massive high velocity (>7 km/s) intrusives/underplate material in the lower crust nor any synrift or early post‐rift subaerial volcanics, indicating that the Otway continental margin can be considered a non‐volcanic margin, similar in many respects to some parts of the Atlantic Ocean margins e.g. the Nova Scotia ‐ Newfoundland margin off Canada and the Galicia Bank off the Iberian Peninsula. Using this analogue, the prominent gravity feature trending northwest‐southeast at the continent‐ocean boundary may indicate the presence of highly serpentinised mantle material beneath a thin crust, but this has yet to be tested by detailed work.  相似文献   

Fishery analysis using gradient-dependent optimal interpolation     

Chunling Zhang  Danyang Wang  Zhenfeng Wang 《海洋学报(英文版)》2022,41(2):116-126

The current lack of high-precision information on subsurface seawater is a constraint in fishery research. Based on Argo temperature and salinity profiles, this study applied the gradient-dependent optimal interpolation to reconstruct daily subsurface oceanic environmental information according to fishery dates and locations. The relationship between subsurface information and matching yellowfin tuna(YFT) in the western and central Pacific Ocean(WCPO) was examined using catch data from January 1...  相似文献   

A calibration method of Argo floats based on multiple regression analysis     

纪风颖  王凡 《中国海洋湖沼学报》2006,24(2):118-124

1 INTRODUCTION Argo floats are instruments that move freely with the ocean current at fixed parking depths and cycle from a profiling depth to the sea surface at regular time intervals. While rising to the surface, these autonomous floats take profiles of…  相似文献   

利用浮石合成13X型分子筛最佳工艺条件的研究     

金为群  权新军  蒋引珊  张军 《吉林大学学报(地球科学版)》1997,(2)

以吉林省长白山地区的天然浮石为原料，成功地合成了１３Ｘ型分子筛，对其合成路线，反应条件进行了研究，确定了合成１３Ｘ型分子筛的最佳工艺条件，并通过Ｘ射线衍射法及差热分析等手段证明了产物的结构  相似文献   

Bathymetric mapping and sub-bottom profiling through lake ice with ground-penetrating radar   总被引：2，自引：1，他引：2  

Brian J. Moorman  Frederick A. Michel 《Journal of Paleolimnology》1997,18(1):61-73

Bathymetric mapping of lakes with sonar is essentially limited to the ice-free summer months. Recent developments in ground-penetrating radar technology have greatly increased its portability and capabilities for imaging through fresh water. The suitability of a backpack portable ground-penetrating radar (GPR) system for bathymetric mapping of ice-covered Arctic lakes was investigated by performing grid surveys on three lakes with water depths up to 19 m. It was demonstrated that GPR can now be used to quickly produce high quality bathymetric maps and sub-bottom profiles showing sediment type and lacustrine sediment thickness. While water depths were measured with a precision of ±3%, lacustrine sediment thickness measurements (up to 5 m) had an estimated precision of ±15%.  相似文献