共查询到20条相似文献，搜索用时 46 毫秒
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怀柔应急水源地自运行以来一直续采至今,由于连续干旱和多年的超设计规模运行,导致区内水文地质条件发生了较大变化,为保证其"应急供水"的能力,具备随时启动供水的功能,结合南水北调水源进京的机遇,从资源回补涵养和供水系统的热备运行两方面开展研究工作。在综合分析区域水文地质条件和研究多年地下水动态变化规律的基础上,利用地下水数值模型对怀柔应急水源地在不同开采条件下的回补方式和效果进行模拟,拟定了南水北调进京后区域水资源人工回补方案及应急水源地的热备运行方案,并模拟预测了水源地热备运行和地下水涵养效果,为怀柔应急水源地可持续供水提供科学依据。分析结果表明:南水北调水源进京后,怀柔应急水源地可采用夏季高峰集中供水与日常保压相结合的"集中开采"方案和日常"稳压开采"方案。 相似文献
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本文运用响应矩阵法,建立了河南新郑龙湖地区地下水优化开采管理模型用单纯形法在计算机上求解得出供水水源地不同开采井的优化开采量,并进行了水位预报,效果甚好。 相似文献
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郑州北郊地下水源地傍河取水对区域环境的影响分析 总被引：1，自引：0，他引：1
郑州北郊水源地为大型傍河型地下水源地，随着地下水的开采，伴随着地下水位的下降，降落漏斗的形成，将给水源地附近区域环境带来一系列的影响。本文对水源地投入运行后，可能对区域环境带来的影响进行了几方面的分析。 相似文献
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为提高河南西平县城区供水能力,对县城西侧拟新建的水泉汪水源地中深层地下水允许开采量进行评价.通过建立水文地质模型,以两种开采方案为约束条件,运用解析法对中深层地下水允许开采量评价并预测未来水源地地下水水位变化情况,结果显示:水源地在运行期间水位满足要求,两种方案开采20年后各井中水位均高于含水层顶板,证明水位下降情况在... 相似文献
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有限数据样本量所关联的不确定性因素,对水资源评价结果的可靠度有着显著影响。在地下水源地勘查与运行过程中,地下水位变幅是一个具明显缓变性质的随机变量。以山东省济宁市承压水源地为例,利用水均衡法评价方法,基于模糊-随机模型,定量研究缓变随机变量在先验分布与后验分布条件下对评价结果的风险影响。结果表明:受不确定性因素时变特性的影响,水源地按勘查成果形成的计划开采量运行,将导致水源地形成过量开采的风险率由13.67%增加至15.75%;考虑不确定性因素时变特性影响,随机变量的不确定性区间由5.64减小到3.60;利用后验信息及时调整开采计划,可保障水源地的供水安全。 相似文献
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陈官庄水源地地下水资源开采主要针对中深层地下水,赋存于新近系上新统冲湖积层中,埋深在80~200 m,岩性以细砂、中细砂为主,次为粉砂,砂层分布较连续稳定,富水性较好。水源地开采后,将形成一个降落漏斗,根据计算,在现状条件下,水源地开采后不会造成水源枯竭及水井报废;水源地投产后,在合理开采的情况下,地下水的水质类型将不会发生太大变化;水源地中深层地下水的开采不会影响浅层地下水;在开采降落漏斗范围内,应对其地面沉降进行监测;水源地不存在压矿问题和采煤引起地面塌陷环境地质问题;提出了水源地保护及监测措施。 相似文献
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新建水源地如何最优布井,对水源地开采运行具有重大影响。本文介绍了0-1整数规划及其求解方法,并结合一个实际问题进行说明。作者应用0-1整数规划方法建立了北京密怀顺平原区拟建水源地最优布井的地下水管理模型,采用响应矩阵法将地下水模拟模型和管理模型相耦合,运用分支-定界法求出最优井位,并将优化井位与原拟定井位的计算结果进行了对比。结果表明,0-1整数规划能很好地解决最优布井问题,对水源地规划、基坑降水、地下水人工回灌等方面都具有一定的指导意义。 相似文献
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地下水化学动力学法在大庆前进水源地求参中的应用 总被引：2，自引：1，他引：1
大庆前进水源地自20世纪80年代运行以来,随着开采活动的加剧,地下水系统状态已发生改变,水资源重新评价势在必行。依据已有水文地质和水质分析资料,运用地下水化学动力学理论和方法,通过水化学指标（组分活度α、矿物饱和指数β）的计算分析,结合有限的抽水试验资料,分区计算出渗透系数K、导水系数T、地下水实际流速U、渗透速度V和地下水年龄t等5项水文地质参数,定量的认识水文地质条件,认证了水源地泰康组承压含水层具有渗透性强、导水性强、地下水循环交替快、可更新能力强等特点。不仅为地下水资源评价提供了参数,也为水源地持续合理地开发管理提供了定量依据。 相似文献
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侯马市地处山西省南部,由于行政区域狭小,供水水源难以解决,长期处于供水不足的被动局面,制约了侯马市经济的发展。驿桥水源地是侯马市城市供水水源地,地处紫金山山前洪积扇区,开采第四系松散层孔隙水。通过对水源地地下水开采条件分析,确定了水源地的资源量和可开采资源量,为区域水资源的优化配置提供了科学依据。 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 Lozac&#x;h 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