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熊先保 《地震地磁观测与研究》2005,(Z1)
从台站产出的原始地形变前兆数据出发,提出一些实际操作性较强的预处理方法,从已编制好的软件中给出处理实例,从而提高台站观测人员的科研能力,填补资料预处理方面的某些空白,这对于台站人员集观测、科研于一体有着十分重要的意义。从950102项目厦门地震台前兆数据预处理的实践表明:这些方法取得了明显的实效,直到今天仍然具有很大的使用价值。 相似文献
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模拟前兆观测数据共享是天津市地震局前兆台网中心的一项重要工作.本文从地震台站、地震办公室模拟前兆数据文件的报送、观测日志文件的报送、数据库模拟数据表及日志表的建立、模拟前兆数据下载转换入库、观测日志下载入库、数据库复制等6个环节介绍了天津模拟前兆观测数据共享的整个过程,阐述了每个环节中采用的关键技术. 相似文献
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地震前兆观测数据处理系统 总被引：1，自引：2，他引：1
作者用Visual foxpro开发的《地震前兆观测数据处理系统(台站版)》是专门为地震台站的需要而设计的，系统用登录表单的方式来选择形变、流体学科的4种观测手段，通过不同的菜单，不但能完成前兆观测资料的日常处理，又能完成资料入库、资料解释、资料预处理等工作，从而帮助台站观测人员及时分析处理本区的观测资料，做好地震短临预报工作。 相似文献
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SS—Y伸缩仪常见异常现象分析 总被引：1，自引：1，他引：0
针对地震台站SS-Y伸缩仪常见异常现象进行分析判断,给出维护方法,以便于观测、维护人员识别,对地震前兆台站管理人员有一定指导意义。 相似文献
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鹤岗地震台形变观测数据特征分析 总被引：1，自引：1，他引：0
整理鹤岗地震台多年形变观测资料,分析观测数据中较为明显的突跳、台阶等数据畸变出现的原因,结合观测环境、仪器故障、人为因素、同震阶跃等影响因素,讨论数据畸变特征,使地震台站人员在日常形变资料分析处理中,能够快速识别数据异常原因,为分析地震前兆异常数据提供参考。 相似文献
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云南省前兆模拟观测数据库系统的设计及实现 总被引：4，自引：4，他引：0
介绍了云南省前兆模拟观测数据库系统。该系统由前兆模拟观测数据库和数据库管理软件两部分组成。针对云南省前兆模拟观测手段多、时段长、覆盖面广等特点,选用Microsoft SQ LServer 2000为数据库平台设计建立了云南省前兆模拟观测数据库;针对前兆观测方法及台站观测手段分类管理的特点,选用Delphi为开发工具编制了前兆数据库管理软件。该系统的实现解决了分析预报和研究人员对长期积累的前兆观测数据的科研需要。 相似文献
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河北省地震前兆数据库服务系统故障率升高，硬盘存储空间不足，特别是地震台站节点无备份数据库，服务器一旦崩溃必然造成地震台站节点数据库中数据丢失。本文通过Oracle数据库EXP与IMP工具提供的导出/导入功能，完成由省地震局数据库到地震台站节点（崩溃）数据库的数据恢复，形成一套定期备份并恢复数据的方案，用于河北省地震前兆观测数据备份与恢复。 相似文献
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河北省地震前兆数据库服务系统故障率升高,硬盘存储空间不足,特别是地震台站节点无备份数据库,服务器一旦崩溃必然造成地震台站节点数据库中数据丢失。本文通过Oracle数据库EXP与IMP工具提供的导出/导入功能,完成由省地震局数据库到地震台站节点(崩溃)数据库的数据恢复,形成一套定期备份并恢复数据的方案,用于河北省地震前兆观测数据备份与恢复。 相似文献
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介绍了在前兆地下流体数据预处理时常见到的情况、处理依据及处理实用技巧,讨论了妥当处理观测数据的方法和依据以便提高数据的可靠性和可用性,为地震预报人员和数据使用者提供可靠的研究数据. 相似文献
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《国际泥沙研究》2014,(4)
正Director:Shangfu Kuang,China Vice-directors:Chunhong Hu,China Duihu Ning,China Guangquan Liu,China The International Research and Training Center on Erosion and Sedimentation(IRTCES)was jointly set up by the Government of China and UNESCO on July 21,1984.It aims at the promotion of international exchange of knowledge and cooperation in the studies of erosion and 相似文献
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《中国科学:地球科学(英文版)》2014,(3)
正SCIENCE CHINA Earth Sciences,an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press and Springer,is committed to publishing high-quality,original results in both basic and applied research. 相似文献
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Richard D. Hey 《地球表面变化过程与地形》1979,4(1):59-72
Feedback mechanisms, which operate upstream through drawdown and backwater effects and downstream through sediment discharge are responsible for channel evolution. By combining these mechanisms with channel processes it euables a dynamic process-response model to be developed to simulate the initial evolution of straight gravel-bed channels. When erosion commences on a land surface, sediment entrained in the headwater reach by hydraulic action is selectively transported, deposited and reworked. This produces a damped oscillation between degradation and aggradation as the channel and valley respond to spatial and temporal variations in sediment calibre and hydraulic conditions. The initial cut and fill phases are responsible for valley incision and floodplain development while secondary and subsequent activity can produce river terraces. Eventually sediment entrainment in the headwaters declines as slopes are reduced. Subsequent channel evolution is relatively insignificant because it is dependent on local weathering activity producing material that can be transported on declining slopes. Therefore landforms produced during the initial phase of development, when local weathering was non-limiting, dominate the landscape. 相似文献
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Based on relocating the Jiujiang-Ruichang earthquake sequence which occurred on November 26, 2005 in Jiangxi Province with the double-difference （DD） algorithm and master event technique, the paper discusses the focal mechanism of the main shock （MsS.7） and the probable seismo-tectonics. The precise relocation results indicate that the average horizontal error is 0.31kin in a EW direction and 0.40kin in a NS direction, and the average depth error is 0.48kin. The focal depths vary from 8kin to 14kin, with the predominant distribution at 10kin - 12kin. The epicenter of the main shock is relocated to be 29.69^oN, 115.74^oE and the focal depth is about 10.Skin. Combining the predominant distribution of the earthquake sequence, the focal mechanism of the main shock and the tectonic conditions of N-E- and NW-strike faults growth in the seismic region, we infer that the main shock of the earthquake sequence was caused by a NW striking buried fault in the Rnichang basin. The nature of seismic faults needs to be further explored. 相似文献
19.
《水文科学杂志》2013,58(6)
Abstract The western reservoirs represent the principal groundwater system in Morocco. Demographic, industrial and agricultural developments during the last decade have markedly altered groundwater quality. The Mamora coastal aquifer system is among the Atlantic systems which are most heavily threatened by pollution. Agricultural and industrial activities, and rapid urban growth contribute to the pollution of the groundwater. Contamination transport is facilitated by a high permeability of the aquifer formations. In order to assess the actual groundwater quality of the Mamora aquifer and to understand the influence of the factors generating the pollution, an extensive multidisciplinary research programme is in progress, with hydrochemistry and microbiology playing essential roles. The present paper concerns the spatial distribution of physico-chemical parameters in the groundwater, subjected to domestic, industrial and agricultural pollution. Fifty-seven samples were analysed for several parameters (Ca2+, Mg2+, Na+, K+, Cl?, SO4 2?, HCO3 ?, NO3 ?, pH, electrical conductivity and temperature). The microbiological analysis of 143 samples reveals the presence of four kinds of indicator bacteria in the groundwater resources: faecal Streptococci, faecal coliform, Escherichia coli and Clostridium. The physico-chemical results and bacteriological monitoring show that the nitrate and bacteria concentrations exceed the maximum admissible levels, notably around pumping stations in the sectors of Sidi Taibi, Sidi Ahmed Taleb and Aïn Sbaâ. Contamination is generated by uncontrolled anthropogenic activities and accentuated by the high intrinsic vulnerability of the aquifer system. Several parameters appeared to exceed admissibility standards. Measures are recommended to prevent groundwater pollution in the region. 相似文献
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K.-G. Malle 《洁净——土壤、空气、水》1992,20(4):196-204
Zinc in the Environment. In 1990 the world production of zinc ammounted to 7 Mio. metric tons. The main areas of application were: galvanization, alloys like brass and zinc metal. The content in the earth crust varies between 10–300 ppm zinc with a mean of 70 ppm. Uncontaminated surface waters contain less than 10 mg/m3 zinc. Apart from civilization air contains 1–10 ng zinc per m3. These background concentrations are exceeded by orders of magnitude in zinc deposit areas and where anthropogenic influences predominate. Accumulation can occur in sediments and sewage sludge. Molluscs and Algae also accumulate zinc. Zinc is essential for live. With normal food the zinc supply of man is just sufficient. Bioaccumulation of zinc towards man or chronic oversupply of man is not known. Zinc has no teratogenic or mutagenic effects, a suspicion on a carcinogenic effect proved wrong. In stockbreeding and plant cultivation a minimum supply of zinc is necessary. Plants are relatively less sensitive against higher soil contents of zinc. Considering the toxicological and ecotoxicological effects of zinc in the environment, the critical organismens are marine invertebratae like tubifex, daphnia, gammarus and algae. But normally only a minor part of the total zinc contest is biologically available, depending on salt content and pH of the waters. 相似文献