模糊数学方法在南海北部海区水团分析中的应用   总被引：2，自引：0，他引：2  

李凤岐  苏育嵩  范立群 《中国海洋大学学报(自然科学版)》1989,(Z1)

Some methods of fuzzy sets are applied to the analysis of water masses in the north area of the South China Sea. In distinguishing water masses with the fuzzy clustering method, the authors propose a fuzzy similar relation based on Euclidean distance, and suggest a method for determining the number of water masses by the F-test, and further adjust rationally the boundaries of water masses and the membership relation of samples by the elastic classification method. Eight water masses are distinguished in the area, i.e., Nearshore Diluted Water F, Nearshore Mixed Water M, Warm Surface Water WS, Surface Water S, Surface-Subsurface Mixed Water SU, Subsurface Water U, Subsurface- Intermediate Mixed Water UI and Intermediate Water I. These point-sets of various water masses on the θ-S diagram may be summed up in three types, that is, the deformed elliptical convex point-set, the half-boundless convex point-set and the point-set with single-side concave. For them, we have proposed methods of making their memb  相似文献   

顾及“保真性”原则的双向滚动球变换DDM多尺度表达算法     

董箭  彭认灿  张立华  刘国辉  朱强 《测绘学报》2017,46(6):789-801

在分析符合"安全性"要求的数字水深模型(DDM)正向滚动球变换应用局限的基础上,根据高保真DDM多尺度表达评价标准中对水深值准确性、严密有序性及地形信息等级嵌套性的要求,从顾及"保真性"原则的DDM多尺度表达需要出发,提出一种基于双向滚动球变换的DDM多尺度表达算法。分析了海底地貌特征点在DDM双向滚动球变换过程中的变化趋势,根据DDM正向滚动球变换的尺度依赖特性,计算出了一定尺度下海底地貌的横向分布范围与纵向分布高度,建立了DDM多尺度表达中细部(骨架)地貌的判定准则。通过保留给定尺度下DDM中的骨架地貌,使海底地形的整体变化趋势得到了保持,满足了DDM多尺度表达对水深值准确性的要求;论证了DDM单值曲面等距离面变换的水深序同构特性,通过对给定尺度下的细部地貌进行DDM双向滚动球变换的等距离面提取,使海底地形的局部起伏形态得到了保持,满足了DDM多尺度表达对水深值严密有序性的要求;从满足DDM多尺度表达对地形信息等级嵌套性的要求出发,分析了DDM双向滚动球变换中尺度因子与地形信息等级单元逻辑包含关系的不相关性,论证了任意尺度因子条件下具有的相应等级地形信息范围的一致性。试验结果表明该算法克服了DDM正向滚动球变换存在的无法保留负向骨架地貌和保持海底局部地形起伏形态等不足,可有效保留DDM中骨架地貌并综合细部地貌,满足顾及"保真性"原则的DDM多尺度表达要求。  相似文献   

An assessment of spatial similarity degree between polylines on multi-scale,multi-source maps     

Alireza Chehreghan 《国际地球制图》2017,32(5):471-487

Similarity between the objects has close association with the geometrical structure and details of the objects. Therefore, in this study, a framework was presented based on the geometric criteria, the fuzzy Membership Functions (MF) and human spatial cognition. To increase the efficiency of MF and for the problem to get closer to reality, 1 K, 2 K, 5 K, 10 K, 25 K, 50 K, and 100 K data were used in this framework. The results showed that the degree of spatial similarity is specific to the objects themselves and their geometric structure. No linear or non-linear relationship could be found between scale changes and degree of spatial similarity of the objects, because the geometry of any object independently affects its degree of similarity to other objects in different scales and sources.  相似文献   

兰州市各县区经济发展水平统计分析研究     

景红霞 《测绘与空间地理信息》2017,40(7)

基于地理空间视角,本文运用第一次全国地理国情普查数据成果,结合社会经济统计数据,从经济综合实力、地表利用效益和产业集聚程度3个方面,对经济社会发展进行空间量化和综合性统计分析评价,全面科学地分析了兰州市各县区经济发展水平,为兰州市科学制订经济社会发展战略与规划提供参考依据。  相似文献   

“三驾马车”对广西经济重心空间迁移的拉动分析     

张婷  李红 《地域研究与开发》2017,36(4)

以往对"三驾马车"认知停留在其对经济增长的增量影响,缺乏空间方向概念。由此,以经济重心作为衡量经济空间结构的指标,并以广西为例,从拉动经济增长的消费、投资和出口"三驾马车"视角出发,通过重心和灰色关联度模型,对比分析"三驾马车"重心与经济重心的演化路径,进一步揭示三大拉力对经济重心空间迁移的影响。结果表明:2004—2014年广西经济重心迁移路径呈"S"型,2010,2013年分别为重心空间转向的拐点;在空间位置方面,与经济重心邻近程度由高至低依次是消费重心、投资重心和出口重心;在迁移路径方面,消费重心的移动距离最小且变动较为稳定;出口重心的移动距离最大,整体上呈往西南方向迁移态势;投资重心与经济重心的迁移路径在2009年以后的走势较为一致。在拉力作用方面,"三驾马车"对经济重心在不同阶段及不同方向上的影响强弱不一,整体而言是投资大于消费大于出口。  相似文献   

广西基本公共服务与区域经济协调关系探讨   总被引：1，自引：0，他引：1  

林光祥  吕韬  彭路 《地域研究与开发》2017,36(3)

基本公共服务与区域经济的协调关系本质上是基本民生与经济发展如何兼顾的问题,也是区域协调发展的前沿研究内容。以广西为例,利用协调发展度模型对此展开研究,结果表明:在2004—2015年间,广西基本公共服务-区域经济协调发展水平整体偏低且时间变化稳定,具有经济滞后型特征;14个地级市的协调发展度及其时间趋势变化不一,并按北部湾经济区、西江经济带和桂西资源富集区的时序形成递减分布空间格局,区域差异极为明显。通过Theil指数分解,发现区域内差异是区域差异的最主要特征,并呈倒"V"型演变轨迹。提升基本公共服务与区域经济协调发展水平、缩小区域差异、注重社会经济发展是应有政策含义。  相似文献   

浙江省人居环境气候适宜度概率分布分析     

肖晶晶  李正泉  郭芬芬 《气象与环境科学》2017,40(1):120-125

利用浙江省43年的气候资料,采用人体舒适度指数对浙江人居环境气候适宜度进行分析。结果表明:浙江省出现极热和极冷的概率极小,人居气候适宜度等级为Ⅰ(很冷,极不舒适)、Ⅷ级(热,很不舒适)的概率为0.07%和0.78%,出现Ⅸ级(很热,极不舒适)的概率基本为零;适宜度等级为Ⅳ—Ⅵ级(较舒适至舒适)的天气出现概率为55.0%,其中Ⅴ级(舒适)出现的概率最大,为33.1%。5月和10月是浙江人居环境气候适宜度最好的时段,其中Ⅴ级(舒适)天气出现概率的平均值超过99%;1月是浙江人居环境气候适宜度最低的月份;7月、8月中气候适宜度为Ⅶ级,即暖热不舒适的天气出现概率平均值分别为62.3%和42.8%,出现概率呈现沿海低于内陆,浙南低于浙北,浙中高、浙北浙南低的总体趋势。  相似文献   

Dynamics of Sea Ice and Spectrum of Ice Force     

Shi Qingzeng  Chen Xing Professor  Dept. of Ocean Eng.  Naval Arch  Tianjin Univ.  Tianjin Lecturer  Dept. of Ocean Eng.  Naval Arch.  Tianjin Univ.  Tianjin 《中国海洋工程》1995,(2)

Spectrum and self-excite characters are the two significant characters of the dynamics of sea ice. The spectrum character of sea ice is mainly shown by the spectrum of ice force. The spectrum character of the sea ice is its intrinsic attributes. When the spectrum of ice force from the dynamic response of ice and structure interaction are evaluated, the effect of dynamic character of the structure must be eliminated. In this paper, the ice force spectrum at Bohai Bay and Liaodong Bay is evaluated from the displacement and strain responses of a single degree and a multi-degree freedom structure. The evaluated ice force spectrum can be used to define the spectrum character of ice in the analysis of ice induced vibration.  相似文献   

Serpentinized peridotites as a possible source for oceanic magnetic anomalies     

Katherine A. Nazarova 《Marine Geophysical Researches》1994,16(6):455-462

New data acquired on the slow spreading Mid-Atlantic Ridge during several Legs of the Ocean Drilling Programme (ODP) give evidence that, in many places, serpentinized peridotites constitute the upper oceanic crust in the vicinity of rift valley. This discovery contradicts the classical view on the formation of oceanic crust at the ridge axis, which postulates that only basalts constitute the upper oceanic crust.The magnetic properties of 57 samples of such serpentinized peridotites, collected at five ODP sites in the Atlantic Ocean, have been analyzed in order to examine the origin and evolution of their natural remanent magnetization (NRM). All samples are characterized by NRM (average value about 3.5 A/M) comparable with NRM of altered oceanic basalts. Average Q-ratio (NRM to induced magnetization ratio) was about 2.The results reported here give evidence that serpentinization is a complex and irregular process. The local concentration of magnetite is determined by magnetostatic interaction between magnetic grains rather than volume concentration of magnetite. This local concentration, which represents the degree of serpentinization, affects the NRM value. The domain structure of magnetite grains developed during serpentinization is controlled by the degree of serpentinization.Experimental data show that original remanence of serpentinites exposed in the upper oceanic crust may contribute to the oceanic magnetic anomalies. In particular, serpentinites with magnetite of pseudodomain size represent a very probable source for magnetic anomalies. It is however unlikely that such ODP serpentinites systematically contribute to the oceanic magnetic lineations.  相似文献   

序统计滤波估计检测海洋测深异常数据     

李明叁  张杰  严怀志  刘雁春  吕志平  暴景阳 《海洋测绘》2007,27(1):7-11

根据海洋水深数据处理的要求，构建了海洋水深数据的序统计滤波模型，并根据水深异常数据的特点，提出了离差法判定水深异常数据，在遵循“舍深取浅”这一基本海洋数据处理原则基础上，设计了海洋水深异常数据检测的序统计滤波方案。实例分析表明，该滤波方案能够有效地检测并剔除零水深、负水深、孤立突跳水深，保留连续（个数多于（含）3个的）异常水深，在序统计滤波异常数据检测的基础上剔除粗差，能大幅提高粗差检测的效率。  相似文献