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针对目前地震灾情信息普遍存在的质量问题,根据灾情数据的属性逻辑,采用逻辑分离的清洗框架中基于规则引擎的数据清洗方法进行初步清洗;再从灾情数据的空间逻辑关系出发,通过聚类分析进一步修正数据中存在的错误,弥补基于逻辑分离的清洗框架在孤立点异常检测方面的不足。基于上述规则引擎与空间聚类相结合的清洗技术,设计并实现了一种考虑属性和空间逻辑的地震灾情数据清洗器,并应用于2017年"8·8"九寨沟7.0级地震,分析四川省地震灾情快速上报接收处理系统接收到的客观震感灾情信息。结果表明:地震灾情数据清洗器可快速检测并修正异常的灾情信息,有效提高接收到的灾情数据质量。 相似文献
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文中重点研究了基于地震现场能够获取的离散的地震灾情点信息进行灾情的总体分析和模拟。依靠灾情速报人员或相关人员上报的地震现场灾情点信息,运用泰森多边形和GIS空间分析方法对离散点进行面插值分析和边界修正处理,形成适合计算离散灾情采样点的模型和算法,并借助GIS技术和WebService技术实现该模型和算法,建立相应的试验系统。该模型和系统能够随着灾情收集点的变化进行动态的分析模拟,从而能够在一定程度上及时快速地反映并确定地震灾情的基本分布情况,为地震救灾指挥提供相对确切的灾情分布信息。文中以汶川地震部分数据为例进行分析,结果基本与实际灾情吻合。选取的数据为73条有效短信,这些短信是从截至5月12日24:00收到的600余条灾情上报数据短信中分析提取出来的 相似文献
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《华北地震科学》2015,(3)
地震烈度分布信息是进行科学救灾的依据,目前常用的烈度判定方法尚不能很好地兼顾准确性和效率。近年来,地震灾情信息快速获取手段的不断丰富,使得短时间内快速获取海量地震灾情信息成为可能。根据地震烈度标准和现场调查规范,采用信息融合技术将这些迅速汇集的多源地震灾情信息形成有机整体,据此快速判定地震烈度,可以有效地解决烈度判定的准确性与效率兼顾的问题。通过分析四川省地震灾情快速上报接收处理系统中灾情信息的内容和分级,建立多源地震灾情信息与烈度之间的对应关系,并以该系统在"4.20芦山7.0级强烈地震"中获取到的多源灾情信息为例,运用融合后的多源地震灾情信息进行烈度判定。结果显示,判定结果与实际科考烈度圈基本一致。 相似文献
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网络地震灾情信息智能处理模型与地震烈度判定方法研究 总被引：2，自引：2，他引：0
破坏性地震发生之后,丰富的地震灾情信息和准确的地震烈度图是地震应急救援工作的基础。伴随着互联网的迅速发展,互联网已经成为地震灾情信息获取的一种重要渠道。本文通过构建网络地震灾情信息智能处理模型,将互联网上非结构化的灾情信息转化成结构化的灾情信息。并将网络地震灾情信息与地震烈度相结合,进行地震烈度判定,从而对地震应急期的烈度快速评定结果进行修正拟合。 相似文献
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地震应急测绘信息对于全面获取震区灾情,针对性援救震灾地区有着重要意义。当前针对震区的测绘信息以独立分类形式存在,缺少数据关联性,在整体信息获取上存在较大缺陷,其地震应急响应能力较差。提出地震应急测绘信息智能综合处理方法,构建地震应急联动信息服务技术平台,设计地震灾情辨识框架;通过判断地震灾情辨识框架,提取地震灾情测绘信息的特征向量,得到地震灾情信息关联规则集,引入测绘数据融合算法,将获取的地震灾情信息进行智能融合,获取地震灾害测绘情况的信息融合结果,实现地震灾情的智能综合性处理。实验结果表明,所提方法在地震应急测绘信息智能综合处理方面具备较强的信息处理与分析能力,具有较强的地震应急响应能力,为我国震后应急指挥工作提供了技术支持。 相似文献
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2017年8月8日21时19分九寨沟发生7.0级地震,震后数小时里,大量与地震相关的信息广泛传播,互联网社交媒体高度关注,九寨沟地震成为最热议话题。本文以新浪微博为例,获取了距震中200km范围内震前、震后24h的微博数据,通过对数据清洗、分类和挖掘,分析了此次地震微博的数量、灾情分类、词频统计、时间序列和空间分布等特征,同时与实际灾评结果进行了对比分析。研究结果表明,对震后社交媒体数据进行充分挖掘,分析提取地震灾情关键信息,有助于对灾情的宏观把握,对救灾决策部署有一定的参考意义,是解决震后灾情获取难度大、覆盖小、时效性差等问题的一种有效的辅助手段。 相似文献
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《地震研究》2017,(2)
提出了基于微博舆情信息的震后有感范围快速判定技术框架,构建了微博舆情数据的获取方法和技术流程。根据中国地震烈度表和地震现场工作调查规范,将微博特征词与地震灾情速判指标进行关联匹配,建立微博灾情信息分类指标体系,通过自然邻点空间插值方法将离散分布的微博灾情点转化为连续分布的灾情面,形成震后灾区有感范围的时空变化特征分布图,辅助灾情快速判定。以2014年景谷6.6级地震为例,进行探索和实践。结果表明:在震后1~2 h内,微博用户活跃度高,信息量大且丰富,对信息充分挖掘有助于对灾情的宏观把握,对救灾决策部署有一定的参考意义,弥补了传统获取技术时效性差、数据量少、覆盖面小等问题。 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
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《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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《中国科学:地球科学(英文版)》2014,(12)
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