A remote sensing environmental study of Haiko Bay——Ⅰ Tidal influx and its changes     

Wu Longye  Wu Yongsen  Sun Yuxing 《海洋学报(英文版)》1998,17(1):63-70

Through the water areas extracted from remote sensing images and the combination of the methods for establishing the formula for calculating tidal influx with tidal data, the tidal influx of the Haikou Bay, Hainan Province was found to be 5.14×10⁷m³ in 1990, 5.80×10⁷m³ in 1984 and 5.05×10⁷m³ in 1965, respectively.After the analysis of the morphological and tidal range factors which determine tidal influx, this paper presents the trend of the changes in tidal influx caused by the changes in the morphological factors of the Haikou Bay.It is found that a decreasing trend was shown with a depressive rate of 2×10^-3during the period from 1965 to 1984, and an increasing trend with an incremental rate of 1×10^-3 during the period of 1984-1990.The main reason for the appearance of the decreasing trend before 1984 is the natural deposition and silting-up of the bay sediments; after 1984, the dredging and expansion of the Haikou Port and the Haikou New Port which caused an increase in water area at the mean low tide are the leading factor which causes the increase in tidal influx.  相似文献   

Biogeographic characterization of Mediterranean and Black Seas faunal provinces using GIS procedures     

L. Garibaldi  J. F. Caddy 《Ocean & Coastal Management》1998,39(3):211-227

To identify Mediterranean and Black Seas areas where similar marine faunal provinces occur, geographical distribution maps of 536 species of actual or potential interest to fisheries have been digitized, using GIS software, and three different ecological areas have been delimited by depth, separated by the 200 and 1000 m isobaths. Information on the species ranges was taken mainly from the maps and the texts of the FAO Species Identification Sheets covering the region, and complemented by other sources when necessary. All the distribution maps have then been overlaid by a grid of points at regular intervals every half degree of latitude and longitude. This allowed creation of a matrix of presence or absence of the species at each point from which species richness maps have been generated. The species richness in the Mediterranean proper shows the same negative gradient eastwards that has been observed for nutrients, while the low number of species in the Black Sea could be linked to the fragility and recent fast degradation of this ecosystem. Through the calculation of 65 dissimilarity indices from 50 contiguous points along the coastline and the species richness maps, the region has been divided into nine faunal provinces. These faunal provinces have then been compared with the ten Mediterranean and Black Seas divisions used by the GFCM for statistical purposes, revealing few differences between the two classifications. The definition of faunal provinces in a region when deciding upon Natural Management Areas, and the appropriate GIS approach to be followed, are discussed.  相似文献   

基于北斗卫星的预警信息发布技术研究及实现          下载免费PDF全文

王春芳  陈永涛  李春来  蒋克俭 《应用气象学报》2014,25(3):375-384

利用北斗卫星短报文通信功能,以广播方式发布预警信息,可提高预警信息的覆盖范围和时效性, 填补我国海洋及陆地边远地区预警信息发布空白。但北斗卫星预警信息发布存在传输速率低、冗余信息量大、长预警信息发布成功率低的问题。该文对北斗卫星预警信息发布系统的系统结构、协议体系和关键问题开展研究,通过指挥机并联、预警信息编码、影响区域识别、联合补包等方法,解决了北斗卫星预警信息发布系统建设的关键问题。在此基础上,该文设计了预警信息网络发布协议、预警信息北斗发布协议和预警信息北斗传输协议,并开发了原型系统。  相似文献   

内蒙古电网气象预警服务系统简介   总被引：1，自引：0，他引：1  

韩胜  夏宇宁  张立莉  肖春光 《内蒙古气象》2011,(5):42-43

应用气象多普勒雷达、卫星云图等现代化观测手段和自动化程度很高的地面自动气象站资料以及MM5中尺度预报产品,结合有线网络传输和基于Intranet、Internet的多层分布式技术搭建内蒙古电网气象预警与电力线路安全运行服务系统,开展电网气象预警预测和气象预报服务。系统建立了实时的地面自动气象站资料数据库和中尺度预报产品数据库,实现了多种气象要素的实时监测和预报,为内蒙古电网的运行安全提供了科学依据。  相似文献   

试论遥感地质找矿的进展          下载免费PDF全文

谭衢霖  翟建平  徐光平 《地质找矿论丛》1999,14(4):29-34,88

随着遥感应用的进步,遥感在地质找矿中应用越来越深入,遥感的地质分析能力也不断提高。同时,地理信息系统在遥感信息集成分析、圈定成矿靶区及远景区的应用研究中,成为空间多源信息综合自理伯有力工具,在遥地质找矿中起着巨大的作用。遥感地质找矿的关键是遥感含矿信息提取技术。文章以遥感地质信息获取,含矿多源信息提取与分析,以及地理信息系统在地质找矿中的应用为主要内容,对遥感地质找矿的进展作了简要的阐述。  相似文献   

成矿预测中证据权重法与信息量法及其比较   总被引：25，自引：0，他引：25  

肖克炎  张晓华  陈郑辉  宋国耀  葛艳  刘冬林  王四龙  宁书年  曹燕 《物探化探计算技术》1999,21(3):223-226

本文简述了证据权重法及信息量法的理论基础及计算方法,并对二者进行了比较,同时分别用证据权重法模型和信息量法模型对同一研究区进行预测,取得了极为相似的效果。  相似文献   

浅谈区域地质及矿产调查中的（有关）物探工作     

郭孟习  王光奇 《吉林地质》1999,18(1):72-82

在区域地质调查和找矿工作中,运用地球物理信息解释地质体、线性构造、矿化体、矿体是行之有效的方法。解释的原则是遵循以地质为前提,以物性为基础,以各类地球物理资料为依据,点面结合的解释程序。笔者通过具体实例阐述了物探资料在地质填图和矿产调查中的应用效果,特别是运用综合信息提出的夹皮沟金矿田“一型三式”成矿模型的实例,对该地区地质找矿工作具有一定的实际意义 。  相似文献   

Internet GIS空间数据通讯的部件化构造方法   总被引：4，自引：0，他引：4  

韩海洋  王新洲  龚健雅 《武汉大学学报(信息科学版)》1999,24(4):321-325

在分析分布式地理信息特征的基础上,提出了满足分布式地理信息获取与处理的InterntGIS的要求。针对InternetGIS的浏览器／多服务器体系,结合部件化概念,定义了测览器端与多服务器端数据请求与获取部件的数据结构,解决了分布式地理信息查询的问题。最后用一个应用系统实例加以说明。  相似文献   

武汉市供电局110联动报修计算机管理系统     

胡瑞敏  张晋东  边学工  王昱 《武汉大学学报(信息科学版)》1999,24(4):93

介绍了武汉市供电局110联动报修计算机管理系统的设计和实现方法。系统利用ATM网络和PSTN网络,在SQLServer数据库环境中实现配电故障的信息处理。  相似文献   

Coupling land use allocation models with raster GIS   总被引：5，自引：0，他引：5  

Robert G. Cromley  Dean M. Hanink 《Journal of Geographical Systems》1999,1(2):137-153

As geographic information systems (GIS) have moved from information storage and retrieval operations towards more decision support functions, there is a need for more integration of spatial analytical modules that can assist in locational decisions. This paper presents a methodology for coupling land use allocation models with a raster GIS. For raster systems, the integration of any decision module has been limited by the size of raster datasets that may contain hundreds of thousands of pixels. Therefore, decision heuristics have been used rather than exact methods such as mathematical programming models. For the problem of land use allocation, the special structure of the generalized assignment problem is used here to handle large scale datasets. The advantage of the mathematical programming approach is the additional information associated with the dual variables and opportunity costs that can be used in subsequent sensitivity analyses. Received: 7 April 1998/Accepted: 2 October 1998  相似文献