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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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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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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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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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Gtz Schroth Luciana Ferreira Da Silva Marc‐Andree Wolf Wenceslau Geraldes Teixeira Wolfgang Zech 《水文研究》1999,13(10):1423-1436
The partitioning of rain water into throughfall, stemflow and interception loss when passing through plant canopies depends on properties of the respective plant species, such as leaf area and branch angles. In heterogeneous vegetation, such as tropical forest or polycultural systems, the presence of different plant species may consequently result in a mosaic of situations with respect to quantity and quality of water inputs into the soil. As these processes influence not only the water availability for the plants, but also water infiltration and nutrient leaching, the understanding of plant effects on the repartitioning of rain water may help in the optimization of land use systems and management practices. We measured throughfall and stemflow in a perennial polyculture (multi‐strata agroforestry), monocultures of peach palm (Bactris gasipaes) for fruit and for palmito, a monoculture of cupuaçu (Theobroma grandiflorum), spontaneous fallow and primary forest during one year in central Amazonia, Brazil. The effect on rain water partitioning was measured separately for four useful tree species in the polyculture and for two tree species in the primary forest. Throughfall at two stem distances, and stemflow, differed significantly between tree species, resulting in pronounced spatial patterns of water input into the soil in the polyculture system. For two tree species, peach palm for fruit (Bactris gasipaes) and Brazil nut trees (Bertholletia excelsa), the water input into the soil near the stem was significantly higher than the open‐area rainfall. This could lead to increased nutrient leaching when fertilizer is applied close to the stem of these trees. In the primary forest, such spatial patterns could also be detected, with significantly higher water input near a palm (Oenocarpus bacaba) than near a dicotyledonous tree species (Eschweilera sp.). Interception losses were 6·4% in the polyculture, 13·9 and 12·3% in the peach palm monocultures for fruit and for palmito, respectively, 0·5% in the cupuaçu monoculture and 3·1% in the fallow. With more than 20% of the open‐area rainfall, the highest stemflow contributions to the water input into the soil were measured in the palm monocultures and in the fallow. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
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M. N. French R. L. Bras W. F. Krajewski 《Stochastic Environmental Research and Risk Assessment (SERRA)》1992,6(1):27-45
A procedure for short-term rainfall forecasting in real-time is developed and a study of the role of sampling on forecast ability is conducted. Ground level rainfall fields are forecasted using a stochastic space-time rainfall model in state-space form. Updating of the rainfall field in real-time is accomplished using a distributed parameter Kalman filter to optimally combine measurement information and forecast model estimates. The influence of sampling density on forecast accuracy is evaluated using a series of a simulated rainfall events generated with the same stochastic rainfall model. Sampling was conducted at five different network spatial densities. The results quantify the influence of sampling network density on real-time rainfall field forecasting. Statistical analyses of the rainfall field residuals illustrate improvement in one hour lead time forecasts at higher measurement densities. 相似文献
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M. A. Kahn 《洁净——土壤、空气、水》2000,28(2):95-101
Red tide, a recurrent phenomenon has become conspicuous in several Kashmir lake ecosystems since 1991. The responsible organism (Euglena pedunculata), a rare flagellate rediscovered in the Kashmir Himalaya (Khan 1993) caused first and unprecedented red tide outbreak, constituting a maximum of 96% of resident numerical phytoplankton density in Dal Lake. At present, conflicting hypotheses exist on the generation of causal assemblage(s) imparting redness to waters: Jeeji Bai (1991) linked its origin to acid precipitation – a fallout of burning oil‐fields during the Gulf War – whilst Khan (1993) holds local factor(s) responsible. Field/experimental studies support the latter contention that the influx of untreated sewage, in unison with warm temperatures, high levels of PhAR, iron and interruption to hydrological flow‐pattern together with absence/or reduction in grazing activity created conducive environmental milieu for red tide outbreak. Dal Lake “red tide” drifted the bloom‐inoculum to other waters, including Lake Wular, where additional ecological niches were carved out, threatening the aesthetic value and biological diversity of Kashmir lakes. Ecological monitoring indicates frequent seasonal red tide occurrence in Dal Lake (including summer‐autumn event of 1998) which testifies its unabated eutrophication status. Further studies are needed on ecological adaptability and biogeographic distribution of this rare and unique red tide‐causing flagellate. 相似文献
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