哈尔滨市地下水开采安全警戒量的研究   总被引：1，自引：0，他引：1  

朱雪芹  文丽杰  孟庆国 《水文》2003,23(3):37-39,33

明确了地下水开采安全警戒量的概念，建立了哈尔滨市地下水开采安全警戒量评价指标体系。以地下水过量开采所带来的环境负效应作为评价指标，对这些环境指标进行了量化分级、加权。运用GIS空间叠加手段，建立了研究区每个栅格的地下水开采安全警戒量评价体系，求出了哈尔滨市地下水开采安全警戒量。  相似文献   

硒在干酪根中的两种不同赋存状态:TEM证据   总被引：9，自引：0，他引：9  

温汉捷  裘愉卓  刘世荣 《地球化学》2003,32(1):21-28

对拉尔玛Se—Au矿床和渔塘坝硒矿床中干酪根的高分辨透射电镜(TEM)研究表明，两个矿床的Se在干酪根中的赋存状态是截然不同的。前者Se在干酪根中的富集可能主要以有机结合态的形式存在，主要是取代干酪根中的硫；而后者Se在干酪根中的富集主要以超微包体Se的形式吸附在干酪根中。两种不同的赋存状态可能主要取决于干酪根中硫含量的多少以及成矿时氧化还原条件的变化。研究表明，TEM是研究元素在干酪根中赋存状态的有效手段。  相似文献   

从卫星遥感全色图像中自动提取城市目标   总被引：11，自引：0，他引：11  

文贡坚  李德仁  叶芬 《武汉大学学报(信息科学版)》2003,28(2):212-218

提出了一种从卫星遥感全色图像中自动提取城市目标的方法。在总结城市目标的卫星遥感全色图像特性的基础上 ,设计了一种层次提取的方法。首先在低分辨率图像中提取城市目标的候选区域 ;接着在候选区域内利用城市目标一些更复杂的特性在高分辨率图像中证实城市目标。为了获得城市目标的边界 ,提出了一种基于边缘点密度的算法 ,并将算法应用去提取SPOT图像中的城市目标 ,取得了较好的试验结果  相似文献   

Theoretical Study on Stochastic Modeling of Combined Gravity-Magnetic-Electric-Seismic Inversion and Its Application     

YanHanjie YanHong LiYunping ZhangXiaofeng 《中国地质大学学报(英文版)》2003,14(3):227-233

As gravity field,magnetic field,electric field and seismic wave field are all physical fields,their object function,reverse function and compound function are certainly infinite contiuously differentiable func-tions which can be expanded into Taylor (Fourier) series within domain of definition and be further reduced in-to solving stochastic distribution function of series and statistic inference of optimal approximation,This is the basis of combined gravity-magnetic-electric-seismic inversion built on the basis of separation of field and source gravity-magnetic difference-value(D-value)trend surface,taking distribution-independent fault sys-tem as its unit,depths of seismic and electric interfaces of interests as its corresponding bivariate compound re-verse function of gravity-magnetic anomalies and using high order polynomial(high order trigonometric func-tion)approximating to its series distribution,The difference from current dominant inversion techniques is that,first,it does not respectively create gravity-seismic,magnetic-seismic deterministic inversion model from theoretical model,but combines gravity-magnetic-electric-seismic stochastic inversion model from stochastic model;second,after the concept of equivalent geological body being introduced,using feature of independent variable of gravity-magnetic field functions,taking density and susceptibility related to gravity-magnetic func-tion as default parameters of model,the deterministic model is established owing to better solution to the con-tradictioc of difficulty in identifying strata and less test analytical data for density and susceptibility in newly explored area;third,under assumption of independent parent distribution,a real modeling by strata,the prob-lem of difficult plane closure arising in profile modeling is avoided,This technology has richer and more detailed fault and strata information than sparse pattern seismic data in newly explored area,successfully inverses and plots structural map of Indosinian discontinuty in Hefei basin with combined gravity-magnetic-electric-seismic inversion,With development of high precision gravity-magnetic and overall geophysical technology,it is certain for introducing new methods of stochastic modeling and computational intelligence and promoting the develop-ment of combined gravity-magnetic-electric-seismic inversion to open a new substantial and promoting the develop-ment of combined gravity-magnetic-electric-seismic inversion to open a new substantial path.  相似文献   

中国西部退耕还林(草)和沙漠化土地绿化的区域性气候效应   总被引：10，自引：0，他引：10  

SHI Weilai  WANG Hanjie 《大气科学进展》2003,20(1):45-54

中国正在实施的西部大开发必将导致较大规模的土地利用和地表覆盖(LULC)变化,其中最重要的两类LULC变化是退耕还林(草)和沙漠化土地绿化工程。利用最新的全球地表特征资料数据库(GLCCD)识别以上两项生态建设工程的实施规模与范围,并以此更新了目前比较流行的区域气候模式的下边界条件,利用修正了的区域气候模式研究上述大规模LULC变化可能对中国区域性气候造成的影响。使用的卫星资源数据库是由美国地质测绘局(USGS)和Nebraska-Lincoln大学牵头,根据NOAA卫星的AVHRR资料、USGS掌握的高分辨率数字化地图,以及生态区划和植被分布等资料组建的。  相似文献   

江西2003年夏季罕见高温气候特征及成因分析   总被引：2，自引：2，他引：2  

尹洁  张传江  张超美  文绮新 《气象与减灾研究》2003,26(4):19-22

对江西省2003年夏季罕见高温干旱的强度、气候历史地位、500hPa环流形势特征和海温特征等进行了分析。结果表明,2003年夏季高温强度在多项指标上均排建国以来第一位;在500hPa环流形势上具有特殊的分布特征;在前期环流形势场和海温场上具有一些前兆特征,有较好的预报意义。  相似文献   

INTERANNUAL VARIATIONS OF ATMOSPHERIC HEAT SOURCES AND MOISTURE SINKS OVER THE EQUATORIAL PACIFIC AND THEIR RELATIONS TO THE SST ANOMALIES     

蓝光东  温之平  贺海晏 《热带气象学报(英文版)》2004,10(2):178-189

The interannual variations of atmospheric heat sources and moisture sinks over the Equatorial Pacific and their relations with the SST anomalies are studied using ECMWF reanalysis data from 1979 to 1993. It is found by singular value decomposition (SVD)…  相似文献   

CHARACTERISTICS OF ATMOSPHERIC HEAT SOURCE ASSOCIATED WITH THE SUMMER MONSOON ONSET OVER THE SOUTH CHINA SEA AND THE POSSIBLE MECHANISM RESPONSIBLE FOR ITS LATE OR EARLY ONSET     

蓝光东  温之平  贺海晏 《热带气象学报(英文版)》2004,10(2):190-200

The characteristics of atmospheric heat source associated with the summer monsoon onset in the South China Sea (SCS) are studied using ECMWF reanalysis data from 1979 to 1993. A criterion of the SCS summer monsoon onset is defined by the atmospheric hea…  相似文献   

Earthquake Disaster Management and Insurance     

TANG Ai-ping~  WEN Ai-hua~ 《地球科学进展》2004,(Z1)

As one of the most powerful tools to reduce the earthquake loss, the Earthquake Disaster Management [EDM] and Insurance [EI] have been highlighted and have had a great progress in many countries in recent years. Earthquake disaster management includes a series of contents, such as earthquake hazard and risk analysis, vulnerability analysis of building and infrastructure, earthquake aware training, and building the emergency response system. EI, which has been included in EDM after this practice has been done for many years, include these contents: insurance model, financing. This paper presents the development of china in EDM and EI. The main contents include: (1) the statue and trend of earthquake disaster management and insurance in china; (2) the progresses and new methods about the seismic risk zonation and vulnerability analysis, and the future developing trend, the application of GIS in earthquake disaster assessment is introduced; (3) the way and illustration in building the earthquake disaster e  相似文献   

曲线铁路路基下沉病害检测与分析     

杨新安  陈春安  温国春 《岩土力学》2004,25(9):1397-1400

以阐明曲线铁路路基下沉病害检测、基床强度评估和病害成因分析方法为目标，采用轻便动力触探试验和土工试验方法对沪宁线下行k55 450-k55 500曲线路基下沉病害段进行了试验测试，根据轻便动力触探和土工试验结果，计算出曲线路基基床承载力，与曲线线路路基中总应力进行比较，评估了基床强度状况，分析出该段曲线铁路路基病害产生的成因。  相似文献