桥梁气象专题研究与服务   总被引：2，自引：0，他引：2  

刘聪张忠义  黄世成 《气象科技》2004,32(6):399-403

根据实际开展的桥梁气象专题研究，分析桥梁气象研究与服务如何面对国内大型桥梁建设发展趋势所带来的机遇和挑战，提出开展桥梁气象研究与服务的必要性，并从桥位气候背景、桥位气象参数取值、桥梁气象研究方法以及桥梁施工及营运期气象服务与保障等方面介绍桥梁气象专题研究及服务应开展的主要内容，同时，给出一个已投入实际使用的桥梁施工期气象环境监测与预警系统的建设思路。  相似文献   

河北省生态环境地球化学   总被引：1，自引：2，他引：1  

赵永平  宫进忠  王海云 《物探与化探》2004,28(3):270-272

介绍河北省生态环境地球化学特征及其与人体健康、农作物生长等关系。为环境治理、地方病防治、农业生产等需要,提供了区域环境地球化学的基础。  相似文献   

内蒙古二连浩特市—东乌珠穆沁旗半干旱荒漠草原区区域化探方法试验   总被引：5，自引：0，他引：5       下载免费PDF全文

孔凡吉  张青  曹金虎 《地质找矿论丛》2004,19(4):261-269

内蒙古二连浩特市-东乌珠穆沁旗地区属半干旱荒漠草原区.1∶20万区域化探扫面应针对该类景观区微景观特点,选择土壤或水系沉积物测量方法开展工作.经试验确定采样粒级为-5～ 20目;采样密度2个点/km2;采样介质为残坡积物或冲、洪积物.经4个1∶20万图幅的区域化探扫面工作,取得了明显的异常圈定和地质找矿效果,方法技术有效.  相似文献   

区域水资源与社会经济协调程度评价研究   总被引：8，自引：1，他引：8  

王春泽崔振才  田文苓 《水文》2004,24(3):25-29

基于陈守煜多级多目标模糊模式识别模型，提出了区域水资源与社会经济协调程度评价模型。该模型利用级别特征值解决了多层多级多目标系统区域水资源与社会经济协调程度的评价，给出了多个目标隶属函数的计算公式。经分析比较，方法可行，结果合理。  相似文献   

四川雅安地质灾害时空预警试验区初步研究   总被引：11，自引：2，他引：11  

刘传正  李云贵  温铭生  肖智林  钟沛林  周策  李媛  朱晓冬 《水文地质工程地质》2004,31(4):20-30

借鉴美国旧金山湾和香港地区的经验,提出了地质灾害监测预警试验区建设和研究思路。经过近两年的工作,初步建成了四川雅安地质灾害监测预警试验区。取得的阶段性成果主要有:(1)根据现场考察和试验区地质灾害数据库,统计研究了降雨型滑坡的几何特征;(2)建成了由20台遥测雨量计构成的降雨观测网,取得了2002年4月～2003年8月的降雨观测数据;(3)结合历史降雨资料分析,初步研究了雅安试验区的年、日、小时和十分钟最大降雨特征;(4)研制了斜坡岩土体含水量野外监测仪,取得了桑树坡试验点2003年4月～8月的实时监测数据;(5)自上而下分4层研究了斜坡岩土层含水量变化,发现了岩土层含水量变化对降雨过程的滞后性;(6)基于区域地质灾害评价预警的递进分析理论与方法(AMFP),利用地质灾害因子分析结果,分别计算了雅安试验区地质灾害"发育度"和"潜势度";(7)利用2003年8月23～25日的过程降雨观测资料,对雅安试验区在该降雨过程中发生的地质灾害事件进行了时空预警反演模拟研究,计算出的地质灾害"危险度"分布比较符合实际,"危险度"可以作为预警指数使用。  相似文献   

Regional moment tensor uncertainty due to mismodeling of the crust     

Jan ílený 《Tectonophysics》2004,383(3-4):133-147

The retrieval of earthquake moment tensor (MT) requires the response of the medium, in which seismic waves travel from the hypocenter to the stations, to be known. In inverting long-period (LP) seismic data (teleseismic and LP regional records), a gross earth model is sufficient; with decreasing periods, a more detailed model is needed. This is the case when waveforms of weak earthquakes at regional distances are to be inverted. Regional moment tensors (RMTs) of mostly Mediterranean earthquakes are determined on a routine basis by the Swiss Seismological Survey (SED) by using averaged models of the earth's crust. By inverting broad-band records of the M_w=4.8 earthquake near Udine, N Italy, on Feb. 14, 2002, we tested the sensitivity of the MT solution with respect to possible errors in the earth model used and in the location of the hypocenter depth. We perturbed the P and S velocities and the thickness in the 1-D earth model in the range from 3% to 30% of the parameter values and constructed estimates of confidence regions of the MT and error bars of the source time function (STF) and scalar moment in three frequency bands. Similarly, these error characteristics were determined assuming a mislocation in the hypocenter depth. We found that, in the band of periods from 25 to 50 s, the mechanism is resolved well (at the confidence level 95% at least) up to an earth model uncertainty of 30%, in the passband 10–25 s up to about 10%, but it is undetermined completely at periods of 5–10 s. An error in hypocenter depth of as much as double the value reported by the location procedure does not destroy the resolution of the mechanism at periods above 10 s. In the RMT catalog of the SED, earthquakes of M_w greater than about 3.5 are processed at periods above 30 s; thus, the solutions for these events are robust with respect to a possible uncertainty in the earth model used. Mechanisms of weaker earthquakes, retrieved from short periods, should be interpreted with caution.  相似文献   

Regions and sustainable development: regional planning matters   总被引：1，自引：0，他引：1  

Graham Haughton  Dave Counsell 《The Geographical journal》2004,170(2):135-145

This paper looks at how the term 'sustainable development' has been used in the process of regional plan making over the past decade. It emphasizes the differing geographies of these debates within England, in terms of how sustainable development has been used to justify different types of approach in different parts of the country. Both drawing on and challenging recent work on state theory, the paper argues the need to see regional planning as a part of a multi-scalar governance system, whose importance should not be underestimated.  相似文献   

日本国内旅游业的发展及其地域特征   总被引：1，自引：1，他引：1  

徐皎 《世界地理研究》2004,13(3):72-78

日本旅游业已成为国民经济的重要部门，据2002年日本交通省的统计表明，观光产业GDP已占国内生产总值的2．2％，这一数字与美国相近。但与西方国家显著不同的是，在美、英、法、意等旅游业发达国家中，国际旅游业占据举足轻重地位，而日本的旅游业却以国内旅游为主体。据日本最大旅行社JTB的统计，2002年日本旅游出行人数为34013万人次(其中出国旅游1664万人次)，而同年日本接待的外国入境游客刚刚超过500万人次。本文旨在介绍和分析日本国内旅游业的发生、发展的变化特征，以及国民不同的旅游方式和旅游地域差异。  相似文献   

外商在华投资的地域差异对我国经济发展格局的影响     

马永欢  樊胜岳 《世界地理研究》2004,13(4):51-60

本文从对外资企业调查的角度出发，力图分析影响外商在华投资地域差异性的主要因素。在探讨外商投资地域特征的基础上，从三个层次研究了外资在华分布的不平衡性对我国经济发展格局起了再次塑造作用。以优化经济发展软环境为契机，对我国未来利用外资发展区域经济提供了科学的政策和建议。  相似文献   

A relationship between red tide outbreaks and urban development along the coasts of Guangdong Province     

LIU Xiaonan  WANG Wei 《地理学报》2004,14(2):219-225

Red tides are one of the main coastal catastrophic events in Guangdong Province of southern China. The comparison between the number of red tide events and the development indexes of cities along the coasts of the province shows that the regional differences in red tide outbreaks has close relations with the coastal urban developments. The cause for an initiation of red tide blooms may be natural factors, while wastewater caused by the fast development of population, industry and aquiculture of the coastal cities enhanced the blooms. It may explain why the two periods of frequent outbreaks of the red tides over the last two decades matched the urban developments in the coastal areas of Guangdong not only spatially but also temporally. The red tides in the first period were restricted only to the coasts of middle Guangdong, where urbanization process was at a higher speed than the other coastal areas of the province. In the second period, fast development of the coastal cities in eastern Guangdong led to an increase in the occurrence of red tides in local sea areas of the same coasts.  相似文献