高分辨率遥感技术在厦门海湾生态环境调查中的应用   总被引：5，自引：0，他引：5  

林桂兰  孙飒梅  曾良杰  庄世坚 《台湾海峡》2003,22(2):242-247,T003

对于局部区域研究，高分辨率卫星遥感及其影像的智能化处理技术是获取信息的新手段．本文以IKONOS遥感影像在厦门海湾的应用为例，探讨高分辨率遥感卫星影像应用于海湾生态环境调查与分析的应用技术．通过分析高分辨率影像地物特征，提出高分辨率遥感影像的重要处理技术：采用不同缩放尺度进行分类和利用空间特征及纹理结构进行专题信息提取。  相似文献   

Estimating the underwater light field from remote sensing of ocean color     

Cheng-Chien Liu  Richard L. Miller  Kendall L. Carder  Zhongping Lee  Eurico J. D’Sa  James E. Ivey 《Journal of Oceanography》2006,62(3):235-248

We present a new approach that incorporates two models to estimate the underwater light field from remote sensing of ocean color. The first employs a series of analytical, semi-analytical, and empirical algorithms to retrieve the spectrum of inherent optical properties (IOPs), including the absorption and the backscatter coefficients, from the spectrum of remote sensing reflectance. The second model computes the profile of photosynthetically available radiation E _0,PAR (z) for a vertically homogeneous water column using the information of the retrieved IOPs and the ambient optical environment. This computation is based on an improved look-up table technology that possesses high accuracy, comparable with the full solution of the radiative transfer equation, and meets the computational requirement of remote sensing application. This new approach was validated by in situ measurements and an extensive model-to-model comparison with a wide range of IOPs. We successfully mapped the compensation depth by applying this new approach to process the SeaWiFS imagery. This research suggests that E _0,PAR (z) can be obtained routinely from ocean-color data and may have significant implications for the estimation of global heat and carbon budget.  相似文献   

Evaluation of bending moments and shear forces at unit connections of very large floating structures using hydroelastic and rigid body analyses   总被引：1，自引：0，他引：1  

Byoung Wan Kim  Sa Young Hong  Jo Hyun Kyoung  Seok Kyu Cho 《Ocean Engineering》2007,34(11-12):1668-1679

This paper investigates the characteristics of bending moments, shear forces and stresses at unit connections of very large floating structures (VLFS) under wave loads. The responses of VLFS are calculated by solving multi-body motion equation considering hydroelasticity and connection stiffness. Hydroelastic responses are calculated by the direct method. Higher-order boundary element method (HOBEM) is used for fluid analysis and finite element method (FEM) is introduced for structural analysis. The equation of motion is modified to describe the unit connections by employing spring elements. Bending moments and shear forces at the connections are obtained from the dynamic equilibrium condition for pressures and inertia forces. Two types of VLFS units such as tandem arranged units and side-by-side arranged units are considered in the numerical examples. The influences of connection stiffness, wave frequency and heading angle on responses of VLFS are investigated through the numerical examples. Rigid body analysis along with hydroelastic analysis is also carried out in the numerical analysis and comparison of those two approaches is discussed.  相似文献   

几种地质图件的数据存贮与处理          下载免费PDF全文

门桂珍  萨贤春  雷宝林 《沉积与特提斯地质》1995,(2):40-45

本文主要叙述了在开发煤矿地质信息系统(CMGIS)中的几种主要地质图件的数据存贮与处理技术。地质图件作为一种专业图件,有它特有的属性,如岩性花纹符号的大量出现,各种构造、地物等特殊线条的出现,地质曲线与文字标注的大量出现等。实践表明,采用商品化通用软件包(Auto CAD)已满足不了用户的要求,因为它缺乏地质上所需要的特殊性线型。用它编辑后的图形数据难以二次利用,图素的地质含义不再表现在图形数据库中,况且,如果图形编辑量过大,还必须考虑是否要对原始数据进行调整或增加辅助数据,为此,用户必须在不同的软件环境下运行不同的软件和数据,造成用户学习掌握和使用上的困难。  相似文献   

Présence d'une mangrove à Avicennia au Miocène moyen dans la région de Digne (Alpes-de-Haute-Provence,France) : implications stratigraphiques et paléoclimatiques     

Jean-Jacques Châteauneuf  Hugues Bauer  Isabelle Cojan 《Comptes Rendus Geoscience》2006,338(3):197-205

Avicennia pollen grains have been discovered in marine facies from the Middle Miocene deltaic series of Châteauredon (southeastern France). Based on the local stratigraphy, an age between 15.8 and 16.5 Ma is proposed for these grains. The age and the transgressive context of the Avicennia bearing-levels are in agreement with the maximum extension of the mangrove known in the western Mediterranean during interval N8–NN4 pro parte, in relation with the Langhian highstand. This mangrove occurrence at 42°N latitude during Middle Miocene is a more northern witness of the mangrove sites known in Languedoc and Provence areas. It also implies a lower climatic gradient than today. To cite this article: J.-J. Châteauneuf et al., C. R. Geoscience 338 (2006).  相似文献   

西北五省(区)生态环境综合分区及其建设对策   总被引：17，自引：2，他引：17  

刘胤汉  管海晏  李厚地  王永  刘晓靖 《地理科学进展》2002,21(5):403-409

本文以图像遥感解译为主 ,结合野外实际考察 ,并通过抽样验证完成。在对生态环境界定和赋予内涵的基础上 ,根据区划目的、原则和所选取的指标体系 ,从生态环境分类入手 ,经过从上向下续分和由下向上合并的反复磨合过程、专家集成模拟 ,对西北五省(区 )生态环境做了全面的综合分区研究 ,并针对所存在的生态环境问题 ,提出生态环境保护和建设的对策 ,为西北五省 (区 )实施西部大开发生态环境监测、治理、建设和规划提供科学依据。  相似文献   

Effet de l'agrégation sur le transport de la kaolinite recouverte d'acide humique à travers un sable de quartz d'origine naturelleAggregation effect on the transport of humic-coated kaolinite colloids through a natural quartz sand     

Rachid Ait Akbour  Jamaâ Douch  Mohamed Hamdani  Philippe Schmitz 《Comptes Rendus Geoscience》2002,334(13):981-985

To evaluate the risk of contaminant transport by mobile colloids, it is necessary to understand how colloids and associated pollutants behave during their migration through uncontaminated soil or groundwater. In this study, we investigated the influence of aggregation induced by Ca²⁺ and trace metals (Pb²⁺, Cu²⁺) concentrations on the transport of humic-coated kaolinite colloids through a natural quartz sand at pH=4. Adsorbed divalent cations reduce the colloids surface charge and thereby induce aggregation and deposition in porous media. To cite this article: R. Ait Akbour et al., C. R. Geoscience 334 (2002) 981–985.  相似文献   

地质符号的计算机图形学定义   总被引：2，自引：2，他引：2  

萨贤春 《物探化探计算技术》1997,19(1):90-96

地质符号一般均有其特定的图形特征和表示意义，用以表达地质制图中所涉及的具体或抽象的地质对象。本文对地质符号（尤其是岩性符号）的有关计算机图形学方法进行了分析和比较，并在对各种地质符号的分析研究基础上提出了一种地质符号（岩性符号）的计算机图形学定义的新的综合性方法—图元组合法及其分区编码方案  相似文献   

Mise en évidence d'un nouveau front de chevauchement dans l'Atlas tunisien oriental de Tunisie par sismique réflexion. Contexte structural régional et rôle du Trias salifère     

Sami Khomsi  Mourad Bédir  M. Ghazi Ben Jemia  Hédi Zouari 《Comptes Rendus Geoscience》2004,336(15):1401-1408

Structural interpretations of newly acquired seismic lines in northeastern Tunisia allow us to highlight a new thrust front for the Atlasic range of Tunisia, in contrast to the previously Zaghouan fault thrust Dorsale zone. This new thrust front takes place on weakness tectonic zones, materialized by inherited faults anchored on the pre-Triassic basement. This front seems to be a paleogeographic trend controlling structural style and basin fill with a synsedimentary activity. The front is expressed by reverse faults, thrust faults, back thrusting, and decollement structures. To cite this article: S. Khomsi et al., C. R. Geoscience 336 (2004).  相似文献   

青西油田碳酸盐岩裂缝性储层地球物理预测技术的应用     

师永民撒利明  陈广城田鑫李虹  王斌婷 《应用地球物理》2005,2(2):119-126

白云岩成岩收缩晶间孔、洞、缝与构造网状缝相互沟通可以组成良好的油气储层，但是这种复杂裂缝—孔隙型储层分布随机性强、发育程度和差异性大，储层预测难度大。本文以中国西部酒泉盆地青西油田下白垩统下沟组湖相白云岩裂缝—孔隙型储层为例，提出地球物理综合预测碳酸盐岩裂缝的方法。本文描述了综合地球物理方法预测碳酸盐岩裂缝储层的实施和应用效果。  相似文献