The 3D simulation and optimized management model of groundwater systems based on eco-environmental water demand     

Zhang Guang-xin Ph.D.  Deng Wei  He Yan 《地理学报(英文版)》2002,12(2):226-235

Through the study of mutual process between groundwater systems and eco-environmental water demand, the eco-environmental water demand is brought into groundwater systems model as the important water consumption item and unification of groundwater’s economic, environmental and ecological functions were taken into account. Based on eco-environmental water demand at Da’an in Jilin province, a three-dimensional simulation and optimized management model of groundwater systems was established. All water balance components of groundwater systems in 1998 and 1999 were simulated with this model and the best optimal exploitation scheme of groundwater systems in 2000 was determined, so that groundwater resource was efficiently utilized and good economic, ecologic and social benefits were obtained.  相似文献   

Principle and mathematical method for inverting stress State of a medium from the remote sensing data     

尹京苑  邓明德  钱家栋  房宗绯  赵宝宗  刘晓琳 《地震学报(英文版)》2003,16(4):413-421

It has been proved through experiments that the electromagnetic radiation energy of a substance will vary when stress acts on the substance. This moment, the electromagnetic radiation energy (observation value) received by the remote sensor is triggered not only by the substance temperature and also by the stress. Separating quantitatively these two kinds of electromagnetic radiation energy and then inversing the actual temperature state and stress state of a medium is a matter with practical significance in earthquake prediction and stability monitoring for the large-scale geotechnical engineering. In this paper the principle and the mathematical method for inversing stress by using multiband remote sensing data are discussed in detail. A calculation example is listed.  相似文献   

湖南涟源凹陷构造演化与油气成藏研究   总被引：5，自引：0，他引：5  

周进高  邓红婴  冯加良 《地质科学》2003,38(1):44-51

涟源凹陷经历了2个主要构造演化阶段:晚古生代海相碳酸盐岩夹碎屑岩盖层建造和中生代陆相沉积,现今的逆掩冲断构造样式和构造格局基本定型于燕山期。油气藏的形成经历了早、晚两期,早期形成于印支运动主幕,燕山运动主幕遭到破坏,部分经重新分配后形成次生气藏;晚期形成于燕山运动主幕以后,属原生油气藏。涟源凹陷中部褶断带的紧闭背斜是寻找次生气藏的首选区域,而宽缓向斜中的隐伏隆起则是寻找晚期原生油气藏的靶区。  相似文献   

广西钦州板城晚泥盆世硅质岩地球化学特征及沉积环境探讨   总被引：8，自引：1，他引：8       下载免费PDF全文

邓希光  李献华  陈志刚 《地质科学》2003,38(4):460-469

广西钦州小董——板城地区发育较好的晚泥盆世至晚二叠世含放射虫硅质岩,剖面连续。本文对板城地区石梯水库晚泥盆世含放射虫硅质岩进行了主量元素、微量元素和稀土元素的分析,指示这些硅质岩形成于大陆边缘与深海盆地之间的过渡地带,说明在晚泥盆世钦州地区不存在大洋,与当时在华南板块与扬子板块之间发育古特提斯洋不符。  相似文献   

济阳坳陷稀土元素特征及其在物源对比中的应用   总被引：6，自引：1，他引：6  

陈庆春  吴智平李伟 《地质论评》2003,49(6):622-629

物源是控制沉积物中REE组成最主要的因素，济阳坳陷区岩石稀土元素特征表明：①济阳坳陷古生界与华北地台其他地区同时代地层岩石的REE分布特征具有极大的相似性，这体现了晚古生代济阳坳陷区所处的整个华北地台区为一稳定的克拉通沉积盆地，地层横向分布稳定，具有一致的物源和构造背景；②济阳坳陷古生界为中生界的物源，反映了济阳坳陷区由古生代稳定地台型沉积到中生代山间盆地沉积的转变，中生代洼陷区的沉积主要来自对附近凸起区古生代地层的剥蚀；③新生界样品与中生界样品的REE分布模式具有很大的相似性，从一个侧面反映了济阳坳陷中生代与新生代的构造格局的转变，中生代接受沉积的部分洼陷区至古近纪成为供给物源的凸起区。  相似文献   

Sedimentary Facies Architectures of Third-Order Sequences from Early to Middle Triassic in Nanpanjiang Basin     

MeiMingxiang MaYongsheng DengJun GaoJinhan ChenHuijun MengQingfen LiDonghai 《中国地质大学学报(英文版)》2003,14(2):103-118

There are complex and regular changes on sedimentary facies from the Early to the Middle Triassic in the Nanpanjiang basin. After the obvious drowned event of carbonate platforms in the transitional period between Permian and Triassic, carbonate platforms have evolved into the ramp type from the rimmed-shelf type. The differentiation of sedimentary facies becomes dearer in space, which are marked by the changes from an attached platform to a turbidity basin and several isolated platforms in the basin. The striking characteristics are the development of oolitic banks on isolated platforms in Nanning and Jingxi and the reef- and bank-limestones in the margin of the attached platform in the Early Triassic. Despite the difference of the time-span and the architectnre of fades succession of third-order sedimentary sequences, the process of the third-order relative sea-level changes reflected by the sedimentary facies succession of the third-order sequences is generally synchronous. Therefore, six third-order sequences could be discerned in the strata from the Early to the Middle Triassic in the Nanpanjiang basin. Using two types of facies changing surfaces and two types of diachronisms in stratigraphic records as the key elements, the sedimentary facies architectures of the third-order sequences that represent sequence stratigraphic frameworks from the Early to the Middle Triassic in the Nanpanjiang basin could be constructed.  相似文献   

闽北一次降雹过程的新一代天气雷达回波特征   总被引：7，自引：3，他引：7       下载免费PDF全文

陈秋萍  邓志  苏万康 《气象》2003,29(3):41-45

通过对一次降雹过程的新一代天气雷达资料的强度场、速度场及其它产品的分析，得出对降雹过程不同阶段临近预报有指导意义的结论。  相似文献   

广东省空气质量预报系统   总被引：4，自引：2，他引：4       下载免费PDF全文

吴兑邓雪娇  林爱兰谷德军 梁建茵 《气象科技》2003,31(6):351-355

文章介绍了广东省气象系统开展空气质量预报的概况，包括使用的预报工具，其预报能力与业务运行的预报质量分析，以及进一步提高预报水平的一些设想。  相似文献   

长江流域一次暴雨过程中的不稳定条件分析   总被引：12，自引：3，他引：12  

周玉淑  邓国  黄仪虹 《气象学报》2003,61(3):323-333

文中分析了 1998年 7月 2 0～ 2 3日发生于长江流域的持续性降水和暴雨过程 ,在分析大尺度降水和中小尺度暴雨相对应的环流场和天气实况的基础上 ,主要分析相应大气层结的对流不稳定和条件性对称不稳定条件 ,并对切变线上涡层不稳定做了重点介绍和分析 ,计算了条件性对称不稳定判据和涡层不稳定判据。结果表明 :降水期间大气低层有对流不稳定和对称不稳定能量的积聚 ,在这两类不稳定条件都基本满足的情况下 ,涡层不稳定的维持对此次降水过程中暴雨的发生提供了有利的不稳定环境场 ,具体的计算分析还表明环境场的配置制约着切变线上低涡扰动的发展 ,是造成降水的重要原因之一。  相似文献   

西安市近50年来气候变化多时间尺度分析   总被引：79，自引：4，他引：79  

邓自旺  林振山 《高原气象》1997,16(1):81-93

利用Ｍｏｒｌｅｔ小波变换法分析了西安市近５０年月平均气温距平和月降水量距平变化的多层次时间尺度结构，发现西安市气候变化除１年的自然周期变化和２０－４０年尺度范围的周期变化信号在全时间域中都强小，其它时间尺度的周期变化在时间域中分布很不均匀，具有很强的局部化特征，西安市月平均气温距平变化主要表现为随机振荡，无特征尺度，而月降水量距平变化则有显著的４～５月的时间尺度，西安市气候变化受地理条件的影响较大  相似文献