检索结果-南通市图书馆

Journal of Mountain Science 2020年第4期17卷 801-823页

作者： Barsa ACHARYA Kripamoy SARKAR Ashok Kumar SINGH Sowmiya CHAWLA Department of Applied Geology Indian Institute of Technology(Indian School of Mines)Dhanbad826004India Department of Civil Engineering Indian Institute of Technology(Indian School of Mines)Dhanbad826004India

Identification of failure susceptible slopes through different rock engineering approach is highly valuable in landslide risk management along crucial highway corridors in the high mountainous region. In this study, a critical highway(NH-5) segment in higher Himalaya has been investigated using the various rock mass characterization schemes based on detailed field observations. Since the highway corridor is highly susceptible to discontinuities-driven failures, consisting of jointed rock masses;Mean and Combined kinematic feasibility analysis has been performed for 20 highway slopes. Observed slope mass classes have been compared to the feasibility percentage of discontinuities driven failures(wedge, toppling, and planar) and accordingly the kinematic feasibility zonation along highway segment has been done for each as well as overall failure types. Based on the slope mass conditions and discontinuities driven failures probability(%), responsive remedial measures have been proposed for individual highway slopes to ensure safe and uninterrupted transportation.

关键词： Slope characterization Kinematic analysis Failure zonation map Himalayan highways Landslide Slope stability

Site-Specific zonation of Seismic Site Effects by Optimization of the Expert GIS-Based Geotechnical Information System for Western Coastal Urban Areas in South Korea

在线全文

学校读者我要写书评

暂无评论

International Journal of Disaster Risk Science 2019年第1期10卷 117-133页

作者： Han-Saem Kim Chang-Guk Sun Hyung-Ik Cho Earthquake Research Center Korea Institute of Geoscience and Mineral Resources Geological Research Division Korea Institute of Geoscience and Mineral Resources

Earthquake-induced disasters are often more severe over soft soils than over firm soils or rocks owing to the seismic site effects related to the amplification of ground motion. On a regional scale, such differences can be estimated by spatially predicting the subsurface soil thickness over the entire target area. Generally, soil deposits are deeper in coastal or riverside areas than in inland regions. In this study, the seismic site effects in the coastal metropolitan areas of Incheon and Bucheon, South Korea, were assessed to provide information on seismic hazards. Spatial prediction of geotechnical layers was performed for the entire study area within an advanced GIS framework. Approximately 7500 existing borehole records in the Incheon and Bucheon areas were gathered and archived into a GIS database. Surface geotechnical data were acquired from a walk-over survey. Based on the optimized geo-data, spatial zoning maps of site-specific seismic response parameters, based on multiscale geospatial modeling, were created and presented for use in a regional seismic mitigation strategy. Seismic zonation was also performed to determine site coefficients for seismic design over the entire target area and to compare them with each other. We verified that the geotechnical data based spatial zonation would be useful for seismic hazard mitigation.

关键词： Coastal urban areas Geodata Geostatistical spatial zonation Seismic site effects Site classification South Korea

Analysis on Intensity zonation in Thick Loess Region

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2013年第6期18卷 724-728页

作者：张泽忠吴志坚陈拓雷天 Key Laboratory of Loess Earthquake Engineering Gansu Earthquake AdministrationChina Earthquake Administration Lanzhou Institute of Seismology China Earthquake Administration Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province Key State laboratory of Frozen Soil Engineering Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences

The earthquakes, which occurred in Haiyuan, Tangshan and Wenchuan, have caused serious damages in the loess area and the abnormal intensity sites are commonly found during the earthquakes. The investigation of the actual earthquake damages and character analysis on sites shows that the topography, loess overburden and underground water level and many other factors afect the intensity. In this paper, the thickness of loess overburden of Tianshui City is achieved by inversion algorithm based on site exploration and microtremor test; the amplification efect of peak ground motion acceleration is calculated using numerical method; a complete formula is obtained through summarizing previous achievements and is used to calculate the abnormal intensity under the multifactorial influence. Finally, a seismic intensity anomaly distribution map is plotted applying the graphic information system(GIS) software in Maiji District, Tianshui City. Through the practical investigation of earthquake disaster, it is found that the figure fits the distribution of actual intensity anomaly very well.

关键词： intensity,loess,microtremor amplification efect zonation

A DISCOVERY OF VERTICAL zonation OF THE ROCKS IN THE DEEP-LEVEL NAPPE STRUCTURAL ZONE IN WESTERN GUANGDONG

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1992年第14期37卷 1194-1199页

作者：张伯友俞鸿年 Department of Earth Sciences Nanjing University Nanjing 210008 PRC

There are many Sinian-Cambrian (Z^c-∈_b) epimetamorphic blocks either in groups or scatteredly covering the granitoids in the area of Guangning-Zhaoqing, the northwestern part of Wuchuan-Sihui faults in western Guangdong (Fig. 1). It has been shown that the blocks are allochthonous, i. e. klippes of thrust, and the granitoids are of a part of the slip system which consists vertically of mylonites, migmatites and granites from top to bottom in the deep-level nappe structural zone. Based on this discovery, the authors suggest a new model of fractural metamorphism (thermodynamic metamorphism).

关键词： deep-level nappe structural zone klippe slip system vertical zonation of the rocks

UNCERTAINTY ANALYSIS ON zonation MAPS OF DEBRISFLOW HAZARD IN YUNNAN PROVINCE,CHINA

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2000年第2期10卷 138-143页

作者： LIU Xi-lin(Dapartment of Urban and Environmental Scicnces, Peking University Beijing 100871, P.R.China Institute of Moun tain Hazards and Environment, the Chinese Academy of Sicnces, Chengdu 610041,P.R.China) Department of Urban and Environmental Sciences Peking University Beijing P. R. China Institute of Mountain Hazards and Environment the Chinese Academy of Sciences Chengdu P. R. China

Different researchers select different factors and use different methods to assess the regional hazard degrees of debris now. consequenily, even for the same region, tb.. are often different hazard zonation maps, and there must be some uncertainty in the zonations. Thus the ceriainty analysis of zonation maps becomes obviously *** debris now hazard, those zonation maps with a certainty analysis could provide most valuable information for land users, hazard managers and policy makers. By comparison of three researchers’ findings in Yunnan Province, this paPer shows that seven to nine iafluential factors are chosen for the zonation maps. spatial density of debris flow ravines,regional average rock-weathering coefficient, yearly precipitation, days of≥50 mm daily rainfall, and proportion of sloping land with slope≥25℃to the total land are the most acceptable factors. Mathemahcal methods of maximum-minimumvalues, upperlower limit values and Fuzzy values are used to quantify the factors. Step-by-step methodoogy is commonly used for the zonation maps. Research results show that mchmum uncedrinty is 66. 6% and minimum uncertainty is 35.7% in debris now hazard maps of zhaotong Prefecture and Yunnan Province. Therefore there is still much work for us to improve the zonation methedology.

关键词： debris flow hazard zonation uncertainty zonation map

PROGRESS IN THE STUDY ON MOUNTAINOUS VERTICAL zonation IN CHINA

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 1999年第4期9卷 10-18页

作者：彭补拙陈浮濮励杰

There are many mountains in China. About 33% of the terrestrial parts of the country are mountainous region. Himalayan movement establishes the layout of the mountains in general. Circulation of Eastern Asian monsoon settles the horizontal structure of physical zonation. They lay the groundwork of the mountainous vertical zonation. The authors think there are 18 principal types that belong to the system of monsoonary zonal spectra and the system of mainland zonal spectra according to the features of the base of the mountainous vertical zonation. The paper discusses the regular pattern of the mountainous vertical zonation and provides a lot of forward problems of the mountainous vertical zonation that is very significant.

关键词： mountainous vertical zonation structural type regional difference

Saline-alkali land in the Yellow River Delta: amelioration zonation based on GIS

在线全文

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 2001年第3期11卷 313-320页

作者： GUAN Yuan-xiu, LIU Gao-huan, WANG Jin-feng (State Key Laboratory of Resources and Environment Information System, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China) State Key Laboratory of Resources and Environment Information System Institute of Geographic Sciences and Natural Resources Research CAS

Soil salinization is one of the major land degradation types and has greatly influenced sustainable agricultural development. zonation of saline-alkali land is the precondition for effective amelioration. The present situation of saline-alkali land is monitored by remote sensing image processing. Causes for land salinization are analyzed, especially the two key factors, ground water depth and its mineralization degree, are analyzed by using long-term observation data. Previously, zonation of saline-alkali soil was made descriptively and artificially. Based on the present situation of saline-alkali land, ground water depth and ground water mineralization degree, the zonation of saline-alkali land for amelioration in the Yellow River Delta was completed quantitatively. Four different types of saline-alkali land amelioration zones are delineated, namely, easy ameliorated zone, relatively difficult ameliorated zone, difficult ameliorated zone and unfavorable ameliorated zone. Countermeasures for ameliorating saline-alkali soils are put forward according to ecological conditions of different saline-alkali land zones.

关键词： GIS the Yellow River Delta saline-alkali land zonation

AN IMPROVED METHOD FOR AN ECO-CLIMATIC zonation AND ITS APPLICATION AS ZONES IN ARID GRASSLANDS,SEMIDESERTS AND DESERTS

在线全文

学校读者我要写书评

暂无评论

干旱区资源与环境 1993年第Z1期7卷 100-103页

作者： Ralph Jaetzold Univ.of Trier Germany

The method was developed for a Range Management Handbook of Kenya and the pre-liminary results published 1991. Now it is improved to a stage ready for international discus-sion.1. Main moisture Zones are defined by a ... 详细信息

关键词： Eco-Climatic zonation Arid Grassland Semidesert Desert Pastro-Ecoclimatic Zone

基于zonation的岷山山系多物种保护规划

在线全文

学校读者我要写书评

暂无评论

生态学报 2016年第2期36卷 420-429页

作者：肖静崔莉李俊清中国林业出版社北京100714 北京第二外国语学院旅游管理学院北京100024 北京林业大学省部共建森林培育与保护教育部重点实验室北京100083

空间布局不尽合理是我国的自然保护区发展面临的问题之一,优化现有的自然保护区体系是在资源有限的情况下实现自然保护区的保护效益最大化的最佳途径。以岷山地区为主要研究区域,以25种珍稀濒危物种为主要研究对象,通过MAXENT与ZONATIO... 详细信息

空间布局不尽合理是我国的自然保护区发展面临的问题之一,优化现有的自然保护区体系是在资源有限的情况下实现自然保护区的保护效益最大化的最佳途径。以岷山地区为主要研究区域,以25种珍稀濒危物种为主要研究对象,通过MAXENT与zonation模型模拟,鉴别出岷山地区珍稀濒危物种保护优先区,并提出了自然保护区空间选址的优化方案。研究结果表明,(1)在物种出现点记录较少的情况下,MAXENT模型依然能够比较准确地预测出物种的分布状况;(2)目前建立的保护区对25个物种的平均保护比例为51.8%;(3)通过zonation鉴定的优先区总面积为19958.7 km^2,岷山地区现有的29个自然保护区只保护了目标优先区的47.1%,九寨沟中部与南部,平武北部,平武与北川的交界处,北川西北部等地都存在保护空缺。建议在保护空缺的6个地方新建或扩建自然保护区,并在规划时考虑这些区域内部的优先次序。新提出的保护体系能将物种栖息地的保护比例提高至77.9%。研究结果对于岷山及全国其他生物多样性保护关键地区保护体系的规划都具有重要的借鉴意义。

关键词：自然保护区规划优先区 zonation 岷山

Mineralogical zonation of Wall-Rock Alteration in Jiaodong Gold Province, North China

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 1999年第1期18卷 20-24页

作者： Chen Guangyuan Sun Daisheng Shao Wei Li Shengrong Division of Genetic Mineralogy, China University of Geosciences, Beijing 100083 Fyfe S. William Department of Earth Sciences, University of Western Ontario, London, Ontario, Canada, N6A 5B7 Chen

Mineralogical zonation of wall rock alterations in Mesozoic granitoids is summarized from 18 gold deposits in Jiaodong gold province on the Asian mobile continental margin of the west circum Pacific rim. This paper deals with wall rock alterations developed around gold mineralizations of the quartz vein type in granitoids and the wall rock alteration type in granitoid basement contacts along Mesozoic fault zones trending mostly NNE SSW and NE SW. Five alteration zones are distinguished from host rock to ore zone, namely the chloritization and sericitization zone, the hematitization rutilization and microclinization zone, the quartz sericitization zone, the pyrite quartz sericitization zone and the pyrite silicification zone. The former two are outer zones marked by incomplete alteration of first mafic and then felsic minerals of the granitoids, while the later three are inner zones marked by complete alteration of both mafic and felsic minerals of the granitoids leading to retrogressive sericitization and progressive silicification with participation of ore elements. The whole process proceeds under dynamometamorphism with high fugacity of volatiles. Wall rock alteration is the intermediate link between unaltered host rock and ore mineralization both in time and space. Development of the alteration zonation and its mineral composition controls genetic type of mineralization, size and grade of the deposit and location of the ore zones.

关键词： gold province wall rock alteration zonation mineralogy Jiaodong.