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汾河中游防洪决策支持系统是以管理科学、运筹学、控制论和行为科学为基础,以计算机、仿真技术和信息技术为手段,是辅助管理决策人员在防洪决策活动中,具有智能作用的人一机网络系统。系统由图文信息系统、历史暴雨洪水、雨情水情测报、洪水预报调度、人工演绎系统、智能辅助系统、数据管理系统、操作使用说明等8个部分组成。汾河防洪专家系统是该系统的智能分析部分。本文着重阐述了汾河防洪专家系统的设计思想和实现途径、建立防洪专家知识库的步骤和技巧,以及系统的运行和扩展。 相似文献
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针对淮河中游防洪调度决策的实例,用最高低水位经分段折算,作了语义量化;根据方法库模拟结果来判断某种状态的语义可信度,由半正态分布隶属函数来确定;对各种 状的语义可信度间的转换,采用了模糊聚类的方法。 相似文献
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Ma Shengzhong 《吉林大学学报(地球科学版)》1989,(1)
本文将建造专家系统分成知识转移和知识转变两个过程。提出知识模型、知识模型域、知识模型边界条件、知识库结构等新概念。认为,建好知识模型,是知识获取、建立知识库、建造专家系统的前提、依据、基础。 相似文献
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淮河中游防洪标准为百年一遇,当遭遇超标准洪水,依据洪水调度方案,颍右片防洪保护区可能遭遇溃口洪水风险。基于MIKE构建淮河干流与7条主要入河支流一维模型、研究区和行蓄洪区二维模型,将溃口口门概化为宽顶堰,溃口处采用标准连接和一维模型耦合计算。超标准洪水采用1954年型洪水同频率放大,选用2003年和2007年洪水率定和验证参数。模拟结果显示:新李扒口后洪水沿着八里河等低洼区域向上游演进,300年一遇和1000年一遇最大淹没面积分别为810km~2、911km~2,平均最大淹没水深分别为2.42m、2.70m。模型计算结果符合区域地形地貌等,可为区域防洪规划编制、应急预案制定、洪水风险决策等提供参考。 相似文献
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淮河流域产生暴雨的天气系统主要是由涡切变和台风等五种天气类型造成的,淮河洪水主要发生在7月份.中游22个行蓄洪区在防洪中起到至关重要作用,洪水预报必须与行蓄洪区运用紧密结合,本文根据笔者多年的实践经验,提出宏观预测、中观对策、微观决策的预报调度思路及处理行蓄洪区的预报方法. 相似文献
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陈墨香 《水文地质工程地质》1957,(4)
水利部治准委员会决定在淮河中游利用准河两岸的湖泊及洼地修建蓄洪量为200—300亿立方公尺的大型湖泊水库,其目的除了根治淮河水患,减轻下游洪水的负担给下游防洪规划创造有利条件外,在兴利方面则是利用水库容水的一部分来作灌溉。为此治淮委员会勘测设计院于1953年开始在淮河中游左岸地区进行了潜水动态(仅观测水位)的观测工作,同时也积累了一些资料。1955年夏季淮委水文地质队会同南京大学水文地质专业师生共同完成了中游左岸12100平方公里的水文地质测绘工作,所获得的资料对以后在该区发展灌溉事业提供了初步的资料。并对进一步 相似文献
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Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
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The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引:4,自引:0,他引:4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
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Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozach Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
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正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
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正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
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正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献
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正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861 相似文献