东海水系与生物关系的初步分析     

苗育田  于洪华 《海洋与湖沼》1992,23(2):175-181

本文利用中日黑潮联合调查研究期间1986年5—6月和1989年7—8月航次水文与生物的同步取样资料,分析了东海测区内水系组成与浮游甲藻类及浮游桡足类等分布之间的对应关系。指出了不同生态类型的生物需要不同的物理海洋环境条件。同时,某些指示生物的分布又为区分水系、了解流系情况提供了良好的示性指标,并且从某些生物数量的变化还可以判断出水系混合与变性的程度。  相似文献   

Spatial and temporal variation of water mass mixing characteristic in the East China Sea     

Miao Yutian  Yu Honghua 《海洋学报(英文版)》1991,10(4):511-523

On the basis of the observation data of Kuroshio since 1984 and relative historical data in the East China Sea, spatial and temporal variation of water mass mixing characteristic in the observation area is analysed. The main results are as follows.  相似文献   

Information structure analysis for quantitative assessment of mineral resources and the discovery of a silver deposit     

Wang  Yutian  Tan  Bingqi  Wang  Yifeng  Wu  Jiangtao 《Natural Resources Research》1994,3(4):284-294

We propose an information-structure-analysis (ISA) method to quantify the correlations between quantitative and qualitative variables as well as within each type of variable. This method is applied to the evaluation of mineral resources in the western Zheijiang Province of China. The district contains a number of silver-bearing Fe–Cu–Pb–Zn mineral deposits near igneous complexes and FeCuPbZn zones away from the complexes. Silver anomalies occur not only in the known Fe–Cu–Zn–Pb deposits, but also in the country rock, suggesting the possible existence of silver deposits far from the igneous complexes.The tonnage distribution of silver is modeled by Monte Carlo simulation. This simulation is conducted on the basis of the correlations between silver (Ag) and lead (Pb), since no known data on silver is available. The known tonnage distribution of lead in 11 control cells was used to approximate the tonnage distribution of silver in the Monte Carlo simulation. With ISA and Monte Carlo methods, the total amount of potential polymetallic resources in 49 cells in the western Zhejiang Provice is predicted. Significantly, a deposit with about 24 tonnes of silver has been found within our exploration target area.  相似文献   

综合信息解译图件智能化处理模型     

刘超  王于天 《物探化探计算技术》1996,18(1):82-87

解译过程的智能化实现，一直是综合信息矿产预测理论与实践中所关注的问题。本文根据综合信息解译的特点，分析了实现智能化过程的基本方法，设计了开发智能解译系统的模型。本模型集图像分析与处理技术和专家系统技术为一体，体现了解译过程的本质特征。文中论述了它们的基本任务和要求。本模型对建造不同研究内容、不同解译任务的智能化系统具有指导作用  相似文献   

AUV矢量推进水动力计算及水平回转操纵性试验     

李雨田  雷敏  冯朝  韩用波 《数字海洋与水下攻防》2020,3(4):288-294

针对矢量推进模式下的 AUV 水动力性能和操纵性能，开展了 AUV 矢量推进水动力 CFD 计算， 对矢量推进水平回转操纵性进行了评估，加工了矢量推进样机，并进行湖上操纵性验证。理论计算和试验数据表明：矢量推进具备极高的低速操纵性，该研究为矢量推进在 AUV 上的应用提供了理论和技术基础。  相似文献   

Landslide susceptibility zonation using GIS and evidential belief function model     

Yanli Wu  Yutian Ke 《Arabian Journal of Geosciences》2016,9(17):697

The main goal of this paper is to generate a landslide susceptibility map through evidential belief function (EBF) model by using Geographic Information System (GIS) for Qianyang County, Shaanxi Province, China. At first, a detailed landslide inventory map was prepared, and the following ten landslide-conditioning factors were collected: slope angle, slope aspect, curvature, plan curvature, profile curvature, altitude, distance to rivers, geomorphology, lithology, and rainfall. The landslides were detected from the interpretation of aerial photographs and supported by field surveys. A total of 81 landslides were randomly split into the following two parts: the training dataset 70 % (56 landslides) were used for establishing the model and the remaining 30 % (25 landslides) were used for the model validation. The ArcGIS was used to analyze landslide-conditioning factors and evaluate landslide susceptibility; as a result, a landslide susceptibility map was generated by using EBF and ArcGIS 10.0, thus divided into the following five susceptibility classes: very low, low, moderate, high, and very high. Finally, when we validated the accuracy of the landslide susceptibility map, both the success-rate and prediction-rate curve methods were applied. The results reveal that a final susceptibility map has the success rate of 83.31 % and the prediction rate of 79.41 %.  相似文献   

白令海和楚科奇海水文特征和水团结构的初步分析   总被引：20，自引：7，他引：20       下载免费PDF全文

汤毓祥  矫玉田  邹娥梅 《极地研究》2001,13(1):57-68

根据我国首次北极科学考察所获 CTD资料 ,分析了白令海和楚科奇海的水文特征和水团结构。研究表明 :(1 )该两海域温、盐度的分布有着明显的区域性差异。楚科奇海的温、盐度普遍低于白令海。 (2 )夏季 ,白令海大部分水域温度垂直分布的突出特点是 :在 2 0 m和 2 5 0 m间存在温度低于 3°C的中层冷水。 (3 )在楚科奇海北纬 70°以北海域 ,不论是水温或盐度皆明显减小 ,从而在此区域形成强的温、盐度锋带。 (4)在白令海存在三种水团 ,而楚科奇海的水团则大致分为两类  相似文献   

A sub-surface eddy at inertial current layer in the Canada Basin,Arctic Ocean     

史久新  赵进平  矫玉田  曹勇 《极地研究(英文版)》2007,18(2):135-146

An Arctic Ocean eddy in sub-surface layer is analyzed in this paper by use of temperature,salinity and current profiles data obtained at an ice camp in the Canada Basin during the second Chinese Arctic Expedition in summer of 2003.In the vertical temperature section,the eddy shows itself as an isolated cold water block at depth of 60 m with a minimum temperature of-1.5℃,about 0.5℃ colder than the ambient water.Isopycnals in the eddy form a pattern of convex,which indicates the eddy is anticyclonic.Although maximum velocity near 0.4 m s-1 occurs in the current records observed synchronously,the current pattern is far away from a typical eddy.By further analysis,inertial frequency oscillations with amplitudes comparable with the eddy velocity are found in the sub-surface layer currents.After filter the inertial current and mean current,an axisymmetric current pattern of an eddy with maximum velocity radius of 5 km is obtained.The analysis of the T-S characteristics of the eddy core water and its ambient waters supports the conclusion that the eddy was formed on the Chukchi Shelf and migrated northeastward into the northern Canada Basin.  相似文献   

基于大数据的上海中心城区建成环境与城市活力关系分析   总被引：8，自引：3，他引：8  

塔娜  曾屿恬  朱秋宇  吴佳雨 《地理科学》2020,40(1):60-68

运用大众点评数据、出租车到达数据与文化设施POI数据测度城市活力的经济、社会和文化维度,在街区和街道层面分析城市活力的空间结构特征,建立计量模型分析城市建成环境对城市活力的影响关系。结果表明：①上海中心城区城市活力表现出明显的空间差异,主要表现为由中心向四周递减、浦西优于浦东的总体特征;②街区和街道尺度影响城市活力的建成环境因素存在差异;③街区尺度建成环境对城市社会、经济和文化活力的影响存在差异：提升人口密度对经济活力具有正面影响,过高的人口密度可能不利于社会和文化活力发展;增加POI密度、路网密度和POI混合度有利于城市活力的提升;建筑层数和建筑密度的增加会降低街区的社会活力和文化活力,但会提升街区的经济活力;交通可达性有利于经济活力的提升。  相似文献   

Location choices of Chinese enterprises in Southeast Asia: The role of overseas Chinese networks     

Liang  Yutian  Zhou  Zhengke  Liu  Yi 《地理学报(英文版)》2019,29(8):1396-1410

Journal of Geographical Sciences - With the implementation of the “Going out” strategy and the Belt and Road Initiative, China’s investments have become increasingly influential...  相似文献