基于MapGIS的土地利用数据库建设实践——以赣州市为例     

邹时林  刘波  程朋根  阮见 《华东地质学院学报》2008,31(2)

随着"数字国土工程"的启动,国土资源信息化管理得到了各级政府的高度重视,而土地利用数据库的建设是"数字国土工程"中基础数据库的重要组成部分.文章通过分析桌面地理信息系统MapGIS的功能,结合赣州市土地利用现状图的数字化实践,总结出用MapGIS进行土地利用数据库建库的流程,并对数据库建设中应特别注意的质量问题进行了探讨.  相似文献   

花岗岩残积土水土特征曲线的试验研究   总被引：2，自引：1，他引：1  

汤连生  颜波  李振嵩  于海涛  林国威 《水文地质工程地质》2008,35(4):62-65

本文采用渗析法测定花岗岩残积土的水土特征曲线,详细介绍了渗析法的试验步骤及注意事项,并对花岗岩残积土的水土特征曲线进行了分析。通过试验得到残积土水土特征曲线,无论是干燥段或是浸湿段,下降都较为平缓。花岗岩残积土的进气值较低,仅为10kPa左右,而土体残余含水量较大,为20%左右,说明花岗岩残积土持水能力较强。文章还对水土特征曲线的滞回圈进行了分析,认为水土特征曲线的滞回圈应该是由多种原因引起的。  相似文献   

吉林省龙岗火山群南龙湾第四纪火山碎屑颗粒特征研究   总被引：2，自引：0，他引：2  

于红梅  许建东  林传勇  赵波 《岩石学报》2008,24(11):2621-2630

爆炸性火山喷发形成的碎屑颗粒的粒度、分选性、表面结构和内部结构等特征与火山喷发的机制、岩浆与水作用的程度、搬运过程等有着重要的联系。本文以此为线索,研究了龙岗火山群南龙湾火山的一个剖面,以探讨其喷发类型和特征。在该剖面上采集了不同层位火山碎屑颗粒样品,然后进行显微形貌观测、粒度分析和扫描电镜形貌观测。显微镜下观测表明,射汽爆发、射汽岩浆爆发和岩浆爆发的碎屑颗粒具有不同的成分和形貌特征。粒度分析结果显示,粒度与喷发类型之间存在很好的对应关系,不同的爆发类型具有不同的分维值D范围。SEM分析可以提供有关火山喷发特征对火山碎屑颗粒的影响。本文的研究结果表明,南龙湾火山喷发为爆炸式喷发,包括早期的射汽岩浆爆发,到岩浆爆发至晚期以射汽爆发为主的射汽岩浆爆发的不同阶段,该区火山喷发的不同时期,水参与喷发的程度不同。  相似文献   

黔东北地区钒矿物质组分研究   总被引：3，自引：1，他引：2  

陈建华  彭家强  龙启金  陈波 《贵州地质》2008,25(3)

钒矿石的主要化学成份为SiO2和Al2O3,有机质总量一般为3.24%~10%,其次为TFe1.85%~3.25%,绝大部分V2O5含量均在1%左右,少部分大于2%;伴生元素以Mo、Ag、Cu、TiO2、P2O5、Ni、Co为主。  相似文献   

On the types and dispersions of whistlers as observed in czechoslovakia     

František Jiříček 《Studia Geophysica et Geodaetica》1962,6(1):98-101

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Astronomische Bestimmung der Relativen Lotabweichungen im Westlichen Tatragebiet     

Josef Kabeláč 《Studia Geophysica et Geodaetica》1962,6(1):1-13

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Effect of Cyclic Loading Frequency on Undrained Behaviors of Undisturbed Marine Clay   总被引：2，自引：0，他引：2  

陈云敏  姬美秀黄博 《中国海洋工程》2004,18(4):643-651

Based on a series of cyclic triaxial tests, the effect of cyclic frequency on the undrained behaviors of undisturbed marine clay is investigated. For a given dynamic stress ratio, the accumulated pore water pressure and dynamic strain increase with the number of cycles. There exists a threshold value for beth the accumulated pore water pressure and dynamic strain, below which the effect of cyclic frequency is very small, but above which the accumulated pore water pressure and dynamic strain increase intensely with the decrease of cyclic frequency for a given number of cycles. The dynamic strength increases with the increase of cyclic frequency, whereas the effect of cyclic frequency on it gradually diminishes to zero when the number of cycles is large enough, and the dynamic strengths at different frequencies tend to the same limiting minimum dynamic strength. The test results demonstrate that the reasons for the frequency effect on the undrained soil behaviors are beth the creep effect induced by the loading rate and the decrease of sample effective confining pressure caused by the accumulated pore water pressure.  相似文献   

海洋沉积物声速与物理参数的关系   总被引：4，自引：0，他引：4       下载免费PDF全文

卢博  梁元博 《海洋科学》1993,17(6):54-57

海洋沉积声速与物理性质密切相关，特别是含水量Ｗ和孔隙度Ｎ，它们在建立回归议程和预报沉积物性质中有所贡献。中国东，南海沿海沉积物的资料和数据表明：声速和声速比可以用来预报沉积物性质。  相似文献   

钦州湾潮流特征分析   总被引：9，自引：0，他引：9  

邱绍芳  侍茂崇  陈波 《海洋通报》2003,22(3):9-14

根据1994年5月和11—12月两个航次的调查及近年有关海湾的海流观测资料，分析了钦州湾的潮流特征，观测资料来自分布于该海湾东中西三个航道及相关区域的8个测站。钦州湾涨落潮流特征：落潮流速大于涨潮流速：东部最大涨落潮流速小于西部：夏季落潮流总是大于冬季：龙门水道附近的流速最大，而其余区域的流速相对较小。外湾(钦州湾)余流，是气旋式环流：水体东进而西出。从湾内来的泥沙和污染物质，主要从西部进入外海；中、东槽是主要“进水”通道，外海低泥沙含量、少污染物质的清洁水从这里潮流而上。因此，与西部相比，东部盐度高，水质清洁，底质重金属含量少。  相似文献   

Evidence of NW extension of the North Anatolian Fault Zone in the Marmara Sea: a new interpretation of the Marmara Sea (Izmit) earthquake on 17 August 1999     

Erkan G?ka?an  Cem Gazio?lu  Bedri Alpar  Zeki Yücel  ?ükrü Ersoy  O?uz Gündo?du  Cenk Yalt?rak  Buser Tok 《Geo-Marine Letters》2002,21(4):183-199

Active faults aligning in NW–SE direction and forming flower structures of strike-slip faults were observed in shallow seismic data from the shelf offshore of Avcılar in the northern Marmara Sea. By following the parallel drainage pattern and scarps, these faults were traced as NW–SE-directed lineaments in the morphology of the northern onshore sector of the Marmara Sea (eastern Thrace Peninsula). Right-lateral displacements in two watersheds of drainage and on the coast of the Marmara Sea and Black Sea are associated with these lineaments. This right-lateral displacement along the course of these faults suggests a new, active strike-slip fault zone located at the NW extension of the northern boundary fault of the ?ınarcık Basin in the Marmara Sea. This new fault zone is interpreted as the NW extension of the northern branch of the North Anatolian Fault Zone (NAFZ), extending from the ?ınarcık Basin of the Marmara Sea to the Black Sea coast of the Thrace Peninsula, and passing through B üy ük ?ekmece and K ü ? ük ?ekmece lagoons. These data suggest that the rupture of the 17 August 1999 earthquake in the NAFZ may have extended through Avcılar. Indeed, Avcılar and İzmit, both located on the Marmara Sea coast along the rupture route, were strongly struck by the earthquake whereas the settlements between Avcılar and İzmit were much less affected. Therefore, this interpretation can explain the extraordinary damage in Avcılar, based on the newly discovered rupture of the NAFZ in the Marmara Sea. However, this suggestion needs to be confirmed by further seismological studies.  相似文献