The Shengli I Point Bar on the Yellow River Delta: Three-Dimensional Structures and Their Evolution   总被引：3，自引：0，他引：3  

ZHONG Jianhu  SHEN Xiaohu  NI Jinren  WANG Guanmin  WEN Zhifeng  WANG Xibin  WANG Haiqiao  LI Li  WU Kongyou  LI Yong  HONG MeiEarth Resource  Information College  Petroleum University of Chin  Dongyin  Shandong Earth Science Department  Zhejiang University  Hangzhou  Zhejiang Center for Environment Science  Peking University  Beijing 《《地质学报》英文版》2002,76(4):463-477

Point bars are well developed on the Yellow River delta, among which the Shengli I point bar is the most typical. The point bar, being about 4 km in length and several tens to more than 100 meters in width, is located on the south side of the Shengli Bridge in Kenli County, Dongying, Shandong. It is a typical fine-grained point bar with silt, which is predominant, some clay and minor plant debris and clay boulders. The Shengli I point bar has complicated 3-D structures. Firstly, in a plane view, it comprises mainly eight sedimentary units, bar edge, bar ridge, bar platform, bar plain, bar channel, bar gully, bar pond and bar bay, developing side by side and superimposed one by one in a complex way. Secondly, its vertical structures are very complex due to the partial superimposition of the 8 sedimentary units. Besides hydatogenesis, very intensive wind erosion, eolian, ice and meltwater actions are also visible on the Shengli I point bar. The complex form is made even more complicated because of the abo  相似文献   

胶莱盆地层控型金矿含矿岩系的成岩及成矿作用机理探讨   总被引：2，自引：2，他引：2  

李明琴  张竹如等 《地质与勘探》2002,38(3):33-37

对胶莱盆地蓬家夼与宋家沟两金矿的矿区地质特征，含矿岩系的岩石学，成矿元素，主量元素，微量元素，稀土元素以及碳、氧，硫稳定同位素等地质地球化学特征进行研究。结果表明；两矿床中金矿体的形成和分布受莱阳群及其中的断裂控制，莱阳群既是含矿层，又是矿源层，含矿岩系主要为陆源碎屑岩类，其沉积环境为河、湖相，讨论了含矿岩系的成岩及成矿作用机理。  相似文献   

流域水环境监测管理系统设计与应用——以云南松华坝流域为例     

刘婷婷  史明昌  戴丽 《国土资源信息化》2008,(2):28-32

流域水环境监测管理系统建设将对当地水环境信息化建设和业务部门工作效率提高起到促进作用,为水环境管理与保护决策提供必要依据。文章对信息采集、传输、主要技术和系统总体结构做了研究.介绍了系统功能和实现方法。系统本着低成本、开发简单、快捷、方便的原则,采用可视化开发工具、GIS组件、Access数据库集成模式,开发C/S结构的应用系统。系统实现了基本GIS功能、信息管理、水质模拟、水环境容量计算、污染源分析等功能,满足当前业务数据分析管理需要,达到了一定辅助决策的目的。  相似文献   

Groundwater protection from cadmium contamination by permeable reactive barrier in Qian'an of Jilin,China     

Alkali Mohammed 《东北亚地学研究》2008,(4)

This research studies the reliability of an activated carbon permeable reactive barrier in removing cadmium from a contaminated shallow aquifer.Laboratory tests have been performed to characterize the equilibrium and kinetic adsorption properties of the activated carbon in cadmium-containing aqueous solutions.A 2D numerical model has been used to describe pollutant transport within a groundwater and the pollutant adsorption on the permeable reactive barrier(PRB).In particular,it has been considered the case...  相似文献   

General Entropy Model of Line Segments Uncertainty in GIS     

SHI Yufeng SHI Wenzhong School of Architecture Engineering  Shandong University of Technology  Zhangzhou Road  Zibo  China  Key Laboratoryof Geospace Environment  Geodesy  Ministry of Education  Wuhan University  Luoyu Road  Wuhan  China. 《地球空间信息科学学报》2007,10(1):61-66

Spatial data uncertainty can directly affect the quality of digital products and GIS-based decision making. On the basis of the characteristics of randomicity of positional data and fuzziness of attribute data, taking entropy as a measure, the stochastic entropy model of positional data uncertainty and fuzzy entropy model of attribute data uncertainty are proposed. As both randomic-ity and fuzziness usually simultaneously exist in linear segments, their omnibus effects are also investigated and quantified. A novel uncertainty measure, general entropy, is presented. The general entropy can be used as a uniform measure to quantify the total un-certainty caused by stochastic uncertainty and fuzzy uncertainty in GIS.  相似文献   

Climatic significance of δ~(18)O records from an 80.36 m ice core in the East Rongbuk Glacier, Mount Qomolangma (Everest)     

Paul A. Mayewski 《中国科学D辑(英文版)》2005,(2)

The δ18O variations in an 80.36 m ice core retrieved in the accumulation zone of the East Rongbuk Glacier, Mount Qomolangma (Everest), is not consistent with changes of air temperature from both southern and northern slopes of Himalayas, as well as these of the temperature anomalies over the Northern Hemisphere. The negative relationship between the δ18O and the net accumulation records of the ice core suggests the "amount effect" of summer precipitation on the δ18O values in the region. Therefore, the δ18O records of the East Rongbuk ice core should be a proxy of Indian Summer Monsoon intensity, which shows lower δ18O values during strong monsoon phases and higher values during weak phases.  相似文献   

抗滑桩内力计算“K”法的改进与应用   总被引：4，自引：0，他引：4  

戴自航  彭振斌 《地质与勘探》2002,38(3):79-83

对传统的抗滑桩内力计算“K”法作了一些改进,如建立了滑动面上下统一的坐标系,将桩视为一个整体进行考虑,通过合理的假定,保证了桩身在滑动面处内力和位移的连续性,同时,采用名的MATLAB数学软件设计了“K”法的计算程序,适用于滑坡推力和桩前滑体抗力分布的各种形式以及抗滑桩为刚性桩和弹性桩的情况,实例计算结果表明,较之传统的查表法,该方法有效地提高了抗滑桩内力和位移计算速度和精度,同时可得到理想的可视化计算结果,有助于抗滑桩结构的优化设计。  相似文献   

IAP AGCM中短波辐射方案的改进研究I·引入Fu-Liou短波辐射方案     

张凤 《气候与环境研究》2005,(3)

冰云和水云对短波辐射性质(消光系数、单次散射反照率及不对称因子)的影响很不相同,应分别计算。Fu-Liou短波辐射方案(以下称Fu-Liou code)就是对冰云和水云分别采用了不同的参数化方案,云的短波辐射性质直接由云的物理性质来确定。因此,Fu-Liou code在云的处理方面物理意义更清晰且很合理。作者将Fu-Liou code引入IAP AGCM-II中,称为Version 2。对当代气候场的模拟结果表明,Version 2的各个物理过程是协调匹配的,且其对气候场的模拟性能是好的,从而为进一步改进IAP AGCM的短波辐射方案提供了很好的模式基础。  相似文献   

CLIMATE ANOMALY RECORDED IN GULIYA ICE CORE AND ENSO EVENTS          下载免费PDF全文

杨梅学  姚檀栋 《Acta Meteorologica Sinica》2000,(2)

Examination of ENSO events and the accumulated precipitation and δ~(18)O values recorded in theGuliya ice core,China,shows that the relationship between the occurrence of ENSO events and theprecipitation anomaly in Guliya is significant.In the years of El Nino events,the anomalies ofprecipitation and δ~(18)O values in the Guliya ice core were negative anomalies,that is,the ENSO eventsare related to the deficit of precipitation as well as low temperature in the western China.  相似文献   

Autumn intensification of the Ryukyu Current during 2003-2007   总被引：2，自引：0，他引：2  

ZHU Xiao-Hua  HUANG DaJi & GUO XinYu State Key Laboratory of Satellite Ocean Environment Dynamics  Second Institute of Oceanography  State Oceanic Administration  Hangzhou  China  Center for Marine Environmental Study  Ehime University  - Bunkyo-cho  Matsuyama -  Japan 《中国科学:地球科学(英文版)》2010,(4)

Inverse calculations using data from 16 repeat hydrographic transects collected from April 2003 to June 2007 have yielded velocity structures and volume transports(VTs) of the Ryukyu Current in the region east of the northern Ryukyu Islands.The inverse calculation results show that the Ryukyu Current is dominated by a subsurface velocity core with maximum velocities from 15.1 to 80.0 cm/s,whose positions vary between 110 and 600 dbar and 27.2°-28.2°N along the transect.The mean velocity exhibits a subsurface velocity core with a maximum value of 24.6 cm/s at 326 dbar depth,a VT of 14.0 Sv(1 Sv≡106 m3/s),a vertical dimension of 800 m,and a horizontal dimension of 60 km.The seasonal mean velocities show that the Ryukyu Current is stronger in autumn than in other seasons.It is suggested that this seasonal variation is coincident with the intensification of the anticyclonic eddy south of Shikoku,Japan.  相似文献