Nonlinear seismic response analysis of arch dam-foundation systems- part I dam-foundation rock interaction   总被引：1，自引：0，他引：1  

Xiuli Du  Yanhong Zhang  Boyan Zhang 《Bulletin of Earthquake Engineering》2007,5(1):105-119

The arch dam–foundation rock dynamic interaction and the nonlinear opening and closing effects of contact joints on arch dam are important to the seismic response analysis of arch dams. Up to date, there is not yet a reasonable and rigorous procedure including the two factors in seismic response analysis. The methods for the analysis of arch dam–foundation rock dynamic interaction in frequency domain are not suitable to the problem with nonlinear behaviors, in this paper, so an analysis method in time domain is proposed by combining the explicit finite element method and the transmitting boundary, and the dynamic relaxation technique is adopted to obtain the initial static response for dynamic analysis. Moreover, the influence of arch dam–foundation dynamic interaction with energy dispersion on seismic response of designed Xiaowan arch dam in China is studied by comparing the results of the proposed method and the conventional method with the massless foundation, and the local material nonlinear and nonhomogeneous behaviors of foundation rock are also considered. The reservoir water effect is assumed as Westergaard added mass model in calculation. The influence of the closing–opening effects of contact joints of arch dam on the seismic response will be studied in another paper.  相似文献   

吕梁市干旱规律分析     

李利平  杜月辉  李月连  申建华  刘凤梅 《山西气象》2007,(4):18-19

本文通过分析1961年～2006年吕梁市自然降水的年、季变化，总结出吕梁市离石区50a平均降水量总趋势是以年代递增依次减少，20世纪60年代为多雨时段，70年代为正常略偏少，80年代为正常略偏多年，90年代为少雨时段，进入2000年以来为特少年代。吕梁市干旱主要在春季。  相似文献   

许昌市供电量与气象要素相关分析     

杜彩月  张国平  刘玉巧  徐景花 《河南气象》2007,(4)

利用2005 2006年许昌市逐日供电量和气温、降水、相对湿度等气象要素资料,分析了供电量和这些气象要素之间的相关关系,结果表明,温度为影响本地用电量的主要气象因子,特别是夏季用电量对气温变化的反应更加敏感。  相似文献   

Aridity/humidity status of land surface in China during the last three decades   总被引：9，自引：0，他引：9  

WU Shaohong  YIN Yunhe    ZHENG Du & YANG Qinye . Institute of Geographical Sciences  Natural Resources Research  Chinese Academy of Sciences 《中国科学D辑(英文版)》2005,48(9):1510-1518

To understand regional status and differences is groundwork for researching environmental change, such as regional response to global change, land use/land-cover change, land desertification, and sand/dust storms. At present, geographers are search- ing for driving forces of environmental change and making efforts to reflect human actions on these changes[1―4]. To recognize regional difference, most researches focus on single factor, such as temperature, precipitation, soil and vegetation. Ho…  相似文献   

Land cover changes based on plant successions: Deforestation,rehabilitation and degeneration of forest in the upper Dadu River watershed   总被引：2，自引：0，他引：2  

Jianzhong?Yan  Yili?ZhangEmail author  Wanqi?Bai  Yanhua?Liu  Weikai?Bao  Linshan?Liu  Du?Zheng 《中国科学D辑(英文版)》2005,48(12):2214-2230

The land use/cover classification system is the foundation for land use/cover change study. Remote sensing data were firstly used for land use and land cover classification in the United States in 1971 and the Anderson Classification System was proposed in 1976[1], which was put into use in mapping 1:250000 land use and land cover of the United States. A series of new land cover classification systems have been established in recent years through research projects such as FAO LCCS and Bi…  相似文献   

Geologische und paragenetische Verhältnisse der Erzgänge des Jiblava-Jezdovicer Reviers     

Dušan Němec 《Mineralogy and Petrology》1964,9(1-2):42-85

Ohne ZusammenfassungMit 18 Textabbildungen  相似文献   

Re–Os isotopic dating of molybdenite and pyrite in the Baishan Mo–Re deposit, eastern Tianshan, NW China, and its geological significance     

Lianchang Zhang  Wenjiao Xiao  Kezhang Qin  Wenjun Qu  Andao Du 《Mineralium Deposita》2005,39(8):960-969

The Baishan Mo–Re deposit is located in the eastern section of the eastern Tianshan orogenic belt, NW China. The deposit has a grade of 0.06% Mo and a high content of rhenium of 1.4 g/t. Rhenium and osmium isotopes in sulfide minerals from the Baishan deposit are used to determine the age of mineralization. Rhenium concentrations in molybdenite samples are between 74 and 250 g/g. Analysis of eight molybdenite samples yields an isochron age of 224.8±4.5 Ma (2). Pyrite samples have rhenium and osmium concentrations varying in the range 33.4–330.6 ng/g and 0.08–0.81 ng/g, respectively. Isotope data on seven pyrite samples yield an isochron age of 225±12 Ma (2) on the ¹⁸⁷Re/¹⁸⁸Os versus ¹⁸⁷Os/¹⁸⁸Os plot and an age of 233±14 Ma (2) on the ¹⁸⁷Os versus ¹⁸⁷Re correlation diagram. The ages of molybdenite and pyrite are consistent within the analytical errors. Combined with field observations, the data indicate that Mo–Re mineralization in the Baishan deposit is produced by a magmatic-hydrothermal event in an intracontinental extensional setting after late Paleozoic orogeny. The initial ¹⁸⁷Os/¹⁸⁸Os ratio of pyrite is 0.3±0.07. The ³⁴S values of molybdenite vary from +0.5 to +3.6. Both data indicate that mineralization is derived mainly from a mantle source.Editorial handling: J. Richards  相似文献   

地震趋势预测的一种新模型研究   总被引：5，自引：0，他引：5  

康春丽刘德富  杜建国 《地球信息科学学报》2001,3(1):43-45

 本文根据自激励门限自回归模型原理,对多年的地震活动形势进行了分析,建立了用于地震大形势分析的客观化数值预测模式-在线预测模型。根据1980年以来中国大陆实际发生的地震资料对这一模型的可靠性进行了检验。统计结果表明,利用在线预测模型在对未来地震趋势进行预测时,其年度形势特征量的最大误差为0.3,平均误差为0.12;因此该模型能够比较客观地反映地震形势变化的自然特征及规律,较好的预测未来的地震活动趋势。这一模型的建立为促进地震趋势向客观化、定量化预测方向发展,提供了一种科学途径  相似文献   

Delineation of boundary between tropical/subtropical in the middle section for eco-geographic system of South China   总被引：1，自引：1，他引：0  

WU Shao-hong  ZHENG Du 《地理学报(英文版)》2001,11(1):80-86

Eco-geographic system is a hierarchic regional system that is divided or combined according to comparison and integrated analysis on geographic regions related to biological and non-biological factors, and differentiation of the earth surface. Eco-geographic system serves as a scientific basis that is significant for regional corresponding to global change, establishment of environmental monitoring network, setting up ecological observation stations, rational natural resources use, land managem…  相似文献   

Projects of earth sciences supported by National Natural Science Foundation of China     

Zheng Du 《地理学报(英文版)》2001,11(1):122-126

Program Code Program Title Program Leader 40001001 Application of Caesium-137 Tracing Technique on the Wind Erosion YAN Ping 40001002 Spatial Adjustment to Coordinate Regional Development and Environment Protection in the Liaohe Delta LI Xiuzhen 40001003 Historical Soil Erosion Changes of the Loess Plateau Inverted from Silt-accumulation in the Huanghe Alluvial Fan TAN Lihua 40001004 On the Study of Rock Cryogenic Weathering Processes and Mechanism in the Continental Periglacial Zone ZHU Liping 40001005 Feedback Mechanism Between the Near Surface Blown Sand Cloud and Wind Profiles DONG Zhibao 40001006 Dynamics of Regional and Urban Structure with High-speed Rail Effects XU Yilun 40001007 Research on Urban and Regional Governance of China's Urban Agglomeration Area-Case Study of Southern Jiangsu Region ZHANG Jing-xiang 40001008 Studies on Interpretation in Soil Remote Sensing Supported by Soil Spatial Variation and Landscape Modeling SHI Zhou 40001009 Study on the Physicochemical Property and Its Utilization Specification of Bentonite in North China MA Bei-yan 40001010 Effects of Rewetting and Root Signal ABA on Root Hydraulic Conductivity of Wheat LI Yang-yang 40001011 Rock Weathering Induced by Lichens in Antarctica and Its Significance in Soil Genesis CHEN Jie 40001012 Study on the Inorganic Nanoparticles in Soils WU Jing-gui 40001013 Mechanism and Environmental Risk of Chelate Enhancement for Hyperaccumulator Remediation of Cu Polluted Soil WU Long-hua 40001014 Study on Hydraulics of Soil Erosion by Overland Flow ZHANG Guang-hui 40001015 Inferring Snow Parameters Using Polarimetric and Interferometric Synthetic Aperture Radar Data LI Zhen 40001016 The Study of Spatio-temperal Model of Surface Slick Seeped from Offshore Oil and Gas Reservoirs HUANG Xiao-xia 40001017 Integration Method of Multitype Huge Spatial Database ZHU Qing 40001018 TIN Based Global Image Matching and Three Dimensional Surface Reconstruction JIANG Wan-shou 40001019 Genetic Algorithm Approach to Automation and Intelligence of Map Name Placement FAN Hong 40001020 Environmental Magnetic Study of Sedimentary Iron Cycling during Early Diagnoses ZHANG Wei-guo 40001021 Modeling of Nitrogen and Water Input-yield-leaching Loss Response and the Nitrogen Transformation and Transportation ZHANG Guo-liang 40001022 The Study on the Regional Differentiation of Lake Environment Response to Southwest Monsoon Climate PENG Jin-lan 40001023 Critical Loads of Acid Deposition for Ecosystems and Their Exceedance in Regions Suffered from Acid Deposition in China TAO Fu-lu 40031010 Regional Environmental Processes of Typical Trace Organic Pollutants TAO Shu 40061001 Analysis on the Structure of Karst Watershed and the Characteristics of Low Flow LIANG Hong 40061002 The Development Feature, Dynamic Mechanism and Coordination Research of Urban Concentric Region in West of Yunnan Province and Its Demonstration to Undeveloped, Minority Concentric Region of China WU Qi-yan 40061003 The REE Background Value and Its Influence on Soil Fertility in Laterite in the Hainan Island BI Hua 40061004 Studies on the Mechanism of Soil Fertility Degradation and Techniques of Fertilization Under Arable Soils Condition in the "One-Jiang River and Two-He River" Region in Tibet CAI Xiao-bu 40061005 A Study on Major Factors, Countermeasures and Mechanism of Bahia Grass Later-stage Degeneration at Rare-earth Tailings DONG Wen-da 40061006 Study on Soil Erosion and Land Use Security Pattern in Jinsha River Basin of Yunnan YANG Zi-sheng 40061007 A Study on Environment Dynamic Chart of Southern Mountain Area of Ningxia under Eco-Restoration and Wide Development in West China SUI Yu-zhu 40061008 The Site Study of Environment Carrying Capacity for Tourism in Bita Reserve, Northwestern Yunnan YANG Gui-hua 40071001 Research on Sedimentary Processes and Varve Records of Lake Environment for Meromictic Lake on the Qinghai-Xizang (Tibet) Plateau LI Shi-jie 40071002 Research into the Spatial Variation of the Effective temperature and Its Functions to Vegetation Landscape in Mountainous Areas JIANG Yuan 40071003 Compilation of Coching Chu's Collected Works and Research on His Scientific Innovation Prints FAN Hong-ye 40071004 The Study of the Theory and Experiment on the Water Resource Demanded by the Eco-environment in Arid Region JIA Bao-quan 40071005 Quantitative Analysis on the Difference of Environmental Fragile Degree under Global Change in the Two Sides of Qinling Mountains YAN Jun-ping 40071006 High Resolution Studies of the Holocene Climatic and Hydrological Events in the Weihe River Basin HUANG Chun-chang 40071007 A Land Surface Processes Coupling Model and Observation in Alpine Meadow YAO De-liang 40071008 Effects of Groundwater on Land Surface Processes and Agricultural Ecology YU Qiang 40071009 Study on the Relationship Between Vegetation Change and Main Hydraulic Process in the Oasis-Desert Ecotone ZHAO Cheng-yi 40071010 Experimental Research on Stress Constitutive Relation of Debris Flow in the Field WANG Yu-yi 40071011 From a Longitudinal Section to Research the Environmental Change during the Late Quaternary in the Inland of South China Tropical Zone HUANG Zhen-guo 40071012 Relations Between Dune Lee-side Cross-bedding, Morphology, and Different Scale of Air-flow HA Si 40071013 Formation Mechanism and Evolution Processes of Flood Channels in the Changjiang Estuary SHEN Huan-ting 40071014 The Beach Changes under Wave Action on Tidal Coastal Area BAO Si-lin 40071015 Evolution of Glaciers and Monsoon during the Last Glaciation in the Gongwang Mountain of Yunnan and Yu Mountain of Taiwan CUI Zhi-jiu 40071016 Geomorphic Variation Model of the Yellow River Between the Hukou Fall and the Xiaolangdi Reservoir LI You-li 40071017 Study on Coupling of Karst Surface and Subsurface (Cave) Ecologic and Environment Systems and Speleothem Scenic Stability SONG Lin-hua 40071018 Wind Tunnel Simulation of Desert Dust Entrainment and Field Observations on Structure of the Near-surface Dust Flux LIU Lian-you 40071019 Environmental Effects of Sediments and Suspensions Induced by the Hydrodynamic Processes QIN Bai-qiang 40071020 Studies on the Process of Water Circle and Rule of Crop Water Requirement in Drip Irrigation Fields KANG Yue-hu 40071021 Characteristics of Earthquake Motion in Frozen Earth Site XU Xue-yan 40071022 Analysis of Radio Echo Signals in Snow & Ice and Its Glaciological Significance SUN Bo 40071023 A Study of Modern Process of Snow and Ice on Temperate Glaciers in South-West Monsoon Region HE Yuan-qing 40071024 Seasonal Resolution Methane Record and Isotopic Study in Ice Cores From Tibetan Plateau XU Bai-qing 40071025 Sulfur-containing Species in Snow and Aerosols from Some Regions of the Antarctic and the Arctic SUN Jun-ying 40071026 An Analysis of Regional Industrial Competitiveness of China FEI Hong-ping 40071027 Study on the Evaluation of Ecological Security of Land System in the Region with Centralized Investment XU Gang 40071028 The Flexible Production Complexes of the PC Industry and Their Local Innovation Networks WANG Ji-ci 40071029 Globalization, Localization and the Rural Industrial Agglomerated Districts in China MIAO Chang-hong 40071030 Research on Choice of Residential Location and the Spatial Differentiation of Residential Land Use ZHANG Wen-zhong 40071031 Study on Human Activity-Environmental Change and Their Feedback in Hexi Corridor WANG Nai-ang 40071032 Life Spaces Structure and Social Regions Sustainable Development of the City in China-A Case Study of Xi'an Metropolitan WANG Xing-zhong 40071033 The Course of Integration Between Urban and Rural Areas and the Delimitation of Metropolitan Area in Northeast China XIU Chun-liang 40071034 Study on Transport System and Land Use in Chinese Highly-Densely Developed Cities-Case Study of Guangzhou YAN Xiao-pei 40071035 Studies on Fractal Spatial Network and Chaotic Dynamics of Urban Systems CHEN Yan-guang 40071036 Driving Force for Formation of Spatial Pattern of Natural Pinus Sylvestris var. Mongolica Forest in Eastern Inner Mongolia WANG Xiao-ke 40071037 Study on the Model of Two-core Structure in the Regional Development LU Yu-qi 40071038 The Agricultural Development and Its Effect on the Environment of the Xiliao River Valley during the Liao-Jin Period HAN Mao-li 40071039 Study on the Mechanism of Agricultural Sustainable Development and the Optimization of Industrial Structure in Bashang Plateau MA Li 40071040 Study of Forest Changes and Soil Erosion on the Upper Reaches of Yangtze River in Last 2000 Years LAN Yong 40071041 The Spatial Approach of Ecological Optimizing of City Landscape and Its Practice LI Gui-cai 40071042 A Study on the Formation, Change and Sustainable Development of the Old Industrial Areas - A Case Study of Northeastern Region in China LI Guo-ping 40071043 Integration and Systematization of Mathematic Models for Soil and Water Resources Study in a Basin and Its Application ZENG Zhi-yuan 40071044 Monitoring and Modeling of the Eco-hydrological Processes in a Small Watershed in Yingtan, Jiangxi ZHANG Bin 40071045 Spatio-temporal Variation of Reconstructed Soil and Its Amelioration in Coal Mines HU Zhen-qi 40071046 In-situ Electrochemical Monitoring of Nutrients Leaching Loss in Red Soils after Input of Acid Deposition JIANG Xin 40071047 The Mechanisms of Nitrogen Loss Reduction by the Ammonia Inhibition Films in Paddy Soil YIN Bin 40071048 Composition and Properties of Cutans in Several Soils and Forms and Transformation of Some Elements LIU Fan 40071049 Two-phase Reactions: A New Study on the Mechanisms of the Interactions of Humic Acids with Metal Ions WEI Shi-qiang 40071050 Studies on Mechanisms of Bioremediation of Heavy Metal Contaminated Soil by Arbuacular Mycorrhiza LI Xiao-lin 40071051 The Reactions Between Multi-Nutrient Fertilizers and Soils and Their Influence on Forms of Plant Nutrients ZHOU Jian-min 40071052 Effect of Humus on Potassium Fixon and Release in Soil LIANG Cheng-hua 40071053 Study on the Stability and Scale Change Method of Diagnostic Parameters of Ecological Balanced Fertilization Model HOU Yan-lin 40071054 Spatio-temporal Patterns and Efficiency of Plant Roots in Stabilizing Soil Structure and Reducing Water Erosion in Hilly Landscape LI Yong 40071055 Effect of Changes in Soil Organic Matter on the Erodibility of Red Soils and Their Application to Planning of Soil & Water Conservation ZHAO Qi-guo 40071056 Researches of Desertification Disaster Early-warning System in Hunshandake Sandy Land DING Guo-dong 40071057 The Soil Air Entrapment Lessen Infiltration Rate and Principle Between in the Muddy Water Infiltration LI Yuan-nong 40071058 Erosion and Transport Processes at Loessial Hillslope ZHENG Fen-li 40071059 Use of 137Cs and 7Be Measurements to Study the Temporal and Spatial Patterns of Soil Erosion Delivering Sediment of Water-induced on Agricultural Slope Land YANG Ming-yi 40071060 Quick Monitoring of Land Use Changes Using Satellite SAR Images in South China LI Xia 40071061 The Approach of Spatial Analysis in Automatic Interpretation of Satellite Digital Image QIN Qi-ming 40071062 Vegetation Effect and Scattering Mechanism Analysis of SRTM Interferometric Data WANG Chao 40071063 Chlorophyll High Precision Detection on Remote Sensing & Environmental Science in Coastal Waters CHEN Xiao-xiang 40071064 Studies on Dynamic Simulation for the Modern Loess Geomorphic Process Based on Geographic Information Systems WU Lun 40071065 Study on Spatial Data Model of Digital Earth YANG Chong-jun 40071066 Eco-environmental Study with Remote Sensing Dynamic Detection Based on GIS in Resource Region of the Yellow River ZENG Yong-nian 40071067 Research on Theories and Key Techniques of Spatial Mathematics Basis of "Digital Earth" HU Peng 40071068 The Location Uncertainty of Imagery Data in GIS DU Dao-sheng 40071069 Study on Primitives semantics Relation Model of Geographical Space and Diagram Symbol System of Spatial Reason LU Xue-jun 40071070 Theory and Method of Adjustment on Marine Sounding Net LIU Yan-chun 40071071 Study on Fundamental Framework of Presentation Graphics of Geo-spatial Multi-Dimensional Information DU Qing-yun 40071072 The Environmental Process of Mercury and Methylmercury in the Marsh Wetland in the North of China WANG Qi-chao 40071073 Transport of Persistent and Toxic Organic Pollutants in the Complex System of Water/Sediment/Biota WANG Zi-jian 40071074 Study on the Mass Balance of Aquaculture and the Effects on Water Environment in the Pearl River Delta WEN Yan-mao 40071075 Phytoremediation of Arsenic-pullulated Land:Processes and Mechanism CHEN Tong-bin 40071076 The Effect of Phosphorus-free Detergents on Eutrophication in Lake Tai HUANG Wen-yu 40071077 Reconstruction of Biotope and Community of Abandoned Land in Large Opencast Coal Mine BAI Zhong-ke 40071078 Spatial Effects of Incubation and Transfer of Environmental Technology LU Yong-long 40071079 Effect of Rice Plants on CH4 Emission from Rice Paddy Fields CAI Zu-cong 40071080 The Harms and Laws of Gully Erosion Occurrence and Development WU Yong-qiu 40071081 Tree-Ring Climatic Records from Mts. Helan and East Asian Monsoon Variation since AD 1600 LI Yu 40071082 Study on the Assemblage of Buried Ancient Timbers in Southern China and Its Relations to the Abrupt Climatic Change Events CUI Hai-ting 40071083 Environmental Archaeology Research on Sequence of Marine Transgression and Flood Events in the Yangtze Delta since Holocene ZHU Cheng 40071084 High Resolution Correlation Between Pollen Records of Tropical Eastern Asia and Environmental Changes of the South China Sea ZHENG Zhuo 40071085 C Storage and Historical Change Pattern in Tropical China HAN Xing-guo International cooperation with the above projects are welcome. For detailed information please contract: Director Song Changqing, Dr. Leng Shuying, Division of Geography, National Natural Science Foundation of China. P.O.Box 8610, Beijing, 100085, China. E-mail:Songcq@nsfc.gov.cn. Lengsy@mail.nsfc.gov.cn  相似文献