三江中北段弧—盆格架与地质构造演化   总被引：2，自引：0，他引：2  

彭勇民  潘桂棠  罗建宁 《四川地质学报》2000,(3)

弧—盆体系中岛弧与弧后盆地相间并存是一大特色。本文以昌都地区三叠纪弧—盆格局为例 ,阐明了岛弧、弧后盆地与夹于其间的微陆块等地质特征 ;划分出 2个构造演化阶段 ,一是早中三叠世江达—阿中岛弧与弧后盆地的发育 ,二是晚三叠世滞后型岛弧与生达残留弧后盆地的形成 ,并揭示了其演化的动力学。  相似文献   

东濮凹陷下第三系沙河街组盐类沉积模式新见   总被引：16，自引：4，他引：12       下载免费PDF全文

林又玲  吴贤涛  潘结南  肖继潮 《古地理学报》2000,2(4):66-75

文中认为在东濮凹陷中自沙河街组四段沉积中晚期开始,海水随着海面升降,间歇性地进入由北东向的兰聊断裂和长垣断裂构成的古河谷。高位期,海水以相对暂时性抬高的形式,淹没本区,致使凹陷南部成为向东南或南开口的河口湾,构成盐湖沉积的先期沉积环境,到低位期,海水退出凹陷区,部分海水因 受东西向同沉积走滑断裂（高平集-习城集一线）高地的阻隔而潴留,局限在高平集-习城集断层至文明寨-范县断层的同沉积构造凹陷,潴留海水蒸发、浓缩,形成盐类。在较深的凹地,受陆源淡水的影响较小,卤水浓度相对较高,那里依次沉积了具有深水沉积特点的碳酸盐岩、石膏、石盐等;而在水体较浅的凹地,（如砂砰、泥坪环境）,那里易受季节性洪水影响,卤水淡化,沉积了具有明显浅水特征的灰质泥岩、泥膏岩等。  相似文献   

可控阵的图论特征   总被引：2，自引：0，他引：2  

潘逢宗  刘文斌  谷云东 《中国海洋大学学报(自然科学版)》2000,30(3):531-534

文中提出了模糊矩阵有向图的强链的概念 ,并利用它对可控阵的图进行了研究 ,揭示可控阵的有向图中无强圈的特征 ;着重讨论可控阵的可控度 ,给出可控度的强链刻画。在此基础上 ,通过可控度的性质及其与可控阵、可控阵的标准型的关系研究 ,得出可控度为图中最长强链的长度加 1和可控阵的周期≤ 2的结果。  相似文献   

岩石力学地层理论方法及其煤系气高效勘探开发应用基础述评   总被引：3，自引：0，他引：3  

桑树勋  周效志  刘世奇  黄华州  王冉  韩思杰  王建国  潘冬明  张志镇  汪吉林  陈同俊  赵立明  郑司建 《地质学报》2022,96(1):304-316

煤系气高效勘探开发是当前中国煤地质与非常规油气地质研究关注焦点,"岩石力学地层与非常规油气"是当前非常规油气勘探开发国际前沿研究领域,煤系岩石力学地层与煤系气研究具有理论和实际意义.本文综述了岩石力学地层经典学术思想和新学术思想,评述了岩石力学地层理论方法及其非常规油气勘探开发现状进展,分析了煤系岩石力学地层理论方法构...  相似文献   

Effect of digital elevation model spatial resolution on depression storage     

Jingming Hou  Xinyi Li  Zhanpeng Pan  Junhui Wang  Ruike Wang 《水文研究》2021,35(10):e14381

Surface water storage—including wetlands and other small waterbodies—has largely been disregarded in traditional hydrological models. In this paper, the grid resampling method is adopted to study the influence of the digital elevation model (DEM) grid resolution on depression storage (DS) considering different rainfall return periods. It is observed that the DEM grid size highly affects DS, and the higher the grid resolution is, the larger the DS value. However, when the grid resolution reaches a certain value, the maximum DS value decreases. This suggests that a critical grid resolution value exists at which the water storage capacity of depressions is maximized, namely, 20 m in this work (except for the overall area simulation under infiltration). This phenomenon is further verified in two test cases with and without the infiltration process, that is, calculations of the local area and without infiltration area, respectively. This research may facilitate the accurate computation of the DS process, which is greatly affected by the grid resolution, thereby improving the reliability of hydrological models.  相似文献   

Changing properties of precipitation extremes in the urban areas,Yangtze River Delta,China, during 1957–2013     

Longfei Han  Youpeng Xu  Guangbo Pan  Xiaojun Deng  Chunsheng Hu  Hongliang Xu  Hongyi Shi 《Natural Hazards》2015,79(1):437-454

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Coal Permeability Evolution Under Different Water-Bearing Conditions     

Li  Jianhua  Li  Bobo  Pan  Zhejun  Wang  Zhihe  Yang  Kang  Ren  Chonghong  Xu  Jiang 《Natural Resources Research》2020,29(4):2451-2465

Natural Resources Research - The seepage problem of coal-bed methane (CBM) has attracted increasing attention from the research and industry communities. Coal permeability, which is a key parameter...  相似文献   

The effect of estimating areal rainfall using self‐similarity topography method on the simulation accuracy of runoff prediction     

An‐Ming Bao  Hai‐Long Liu  Xi Chen  Xiang‐liang Pan 《水文研究》2011,25(22):3506-3512

Rainfall input for hydrologic modelling is assumed uniformly distributed over the entire catchment. This can lead to significant errors. Investigations of areal rainfall in mountain areas are typically limited by a lack of adequate meteorological and hydrogeological records. This study focuses on areal rainfall in mountain areas within the Kaidu River Basin, China, with the aim of analyzing the influence of areal rainfall on the simulation accuracy of runoff prediction. We conducted a simulation using MIKE 11/NAM rainfall‐runoff model over 92 days of the rain season and compared the simulation error in different methods. On the basis of properties of self‐similarity degree (SSD) in analyzing the detailed characteristics of terrain, areal rainfall was calculated to model the runoff. The results of the model simulations are generally consistent with observed data, indicating that the self‐similarity topography method is able to reflect the spatial change of rainfall. This indicates that the proposed methodology is applicable for the management of water resources in mountain area. The modelling and self‐similarity topography method study allowed quantification of the spatial rainfall and provided an insight into their implications in hydrological forecasting. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

Comparison of two great Chile tsunamis in 1960 and 2010 using numerical simulation   总被引：1，自引：0，他引：1  

Ruizhi Wen  Yefei Ren  Xiaojun Li  Rong Pan 《地震学报(英文版)》2011,(5):475-483

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基于改进的主成分分析法提取GRACE时变重力场信号     

李杰  范东明  游为  李蔚  蒋攀 《大地测量与地球动力学》2018,38(4):414-421

针对主成分分析法提取时变重力场模型信号中存在信号泄漏和去条带噪声不明显的问题，提出对球谐位系数主成分分析的改进方法。首先对球谐位系数进行主成分分析，提取主要的模态，再对不同模态根据其自身噪声特点选择合适的滤波方法和参数，最后在此基础上进行信号提取。以CSR发布的2005-01~2013-12(108个月)GRACE时变地球重力场模型进行实验，提取2006-06和2006-12等效水高数据和改进前的主成分分析进行比较，表明此方法在有效地剔除条带误差的同时又使得信号泄漏减小。  相似文献