共查询到20条相似文献，搜索用时 46 毫秒
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综合考虑水文气象、南水北调工程、地下水超采控制、入海水量控制目标等因素,以及现状(2005年)、2010年和2020年3个水平年,设置了9个情景方案,应用海河流域二元水循环模型(简称"二元模型")进行了水资源管理战略情景模拟分析.采用GDP、粮食产量、ET(蒸散发量)、入海水量、总用水量、减少地下水超采量等评价指标对9个情景方案的模拟结果进行了评价,给出了各规划水平年的推荐方案.在此基础上,对今后海河流域水资源管理战略问题如ET控制、地下水超采量控制和入渤海水量控制等进行了讨论.研究表明,未来虽然有南水北调工程对本流域的补水,但需要严格控制流域用水量和耗水量,才能做到逐步减少地下水超采量、增加入渤海水量,实现国民经济与生态环境的和谐发展. 相似文献
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准确而可靠地预测地下水埋深对生态环境保护和水资源规划管理具有重要意义。针对吉林西部浅层地下水位动态变化的复杂性和非线性,提出了基于小波分析与人工神经网络相结合的预测方法小波神经网络(WA-ANN)模型。将研究区2002年1月2009年12月当月降水量、蒸发量、人工开采量和前月平均地下水埋深4个参数作为输入,当月平均地下水埋深作为输出,建立浅层地下水埋深预测模型,并与BP神经网络(BP-ANN)模型和自回归移动平均(ARIMA)模型进行比较,对比分析了三者的建模过程及其模拟精度。结果显示:相比两种ANN模型,ARIMA模型建模过程更为简单,计算效率更高;但WA-ANN模型的拟合精度高于BP-ANN和ARIMA模型,预测效果更好。总体来看,WA-ANN模型在浅层地下水埋深预测中具有一定的应用推广价值。 相似文献
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分布参数地下水管理模型的遗传算法研究 总被引：2，自引：0，他引：2
在简单回顾了分布参数地下水管理模型的发展和建模方法基础上, 阐述了将地下水模拟模型耦合到遗传算法之中, 求解分布参数地下水管理模型的方法和特点, 给出了该算法的程序框图。最后通过实例说明遗传算法适于求解非线性地下水管理模型。 相似文献
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以控制地面沉降为约束的地下水资源评价——以上海地区为例 总被引：2，自引：0，他引：2
以上海市区第V承压含水层(埋深约350m )以上的整个第四系松散沉积层为研究体,将上海地下水系统作为一个完整且不可分割的系统来研究。由于开采地下水资源引起地下水系统内部物质能量变化,因而产生一系列的环境地质问题(如地面沉降、地下水位下降、资源开采条件恶化等)。根据研究区地下水系统特征和已有的研究程度,在技术方法和途径上,着重研究上海地区第四系含水层结构、水文地质工程地质条件,建立水文地质工程地质概念模型; 在此基础上建立以地下水资源开采量最大、水位降幅及地面沉降较小、社会经济效益较好为目标的地下水拟三维渗流一维地面沉降的评价与管理模型,并为我国大中城市(特别是在诸如开采地下水引起的地面沉降问题的地区)的地下水资源评价与管理提供可借鉴的经验和方法。 相似文献
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周宗俊 《水文地质工程地质》1986,(6)
应用系统工程的原理与方法对一个独立系统的地下水资源,进行分析研究,并在此基础上建立地下水系统的管理模型(非水井管理),是当前水文地质学的最新课题,本文试以陕西省的具体条件为例,运用地下水系统理论,对编制水文地质图的原则与方法进行探讨。 相似文献
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针对中国一些沿海地区地下水超采及由此带来的海水入侵问题,将地表水补给、抽水量及地下水位等相嵌在一起,建立了沿海地区地下水模拟优化管理模型。将人工鱼群算法和基于MODFLOW2000的变密度地下水流及溶质运移模型耦合起来,对沿海地区地下水模拟优化管理模型进行求解。以山东省威海市节水示范区为例,验证模型的有效性和可靠性。结果表明,10、11、12月份抽水量最大,以后至第2年5月份依次是减少的;从区域分布上看,在临海区域1号井处抽水量是3500～1120m3/月,在其它井处是6540～2920m3/月;与现行方案相比,增加总有效供水1990m3,地下水平均水位升高0.29m,海水入侵问题能够得到解决。计算结果合理可行,为沿海地区地下水资源的科学管理和持续利用提供可靠依据。 相似文献
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《地下水》2017,(6)
依据榆溪河流域水文地质条件构建水文地质概念模型,在此基础上基于可视化数值模拟软件建立流域三维地下水流数值模型,模型经识别与校验完成后,分别对流域地下水补给排泄量、地下水储量、可开采资源量进行计算评价,研究表明:(1)流域2006年、2009年和2010年在均衡期内地下水处于负均衡状态;2007年、2008年、2011年、2012年和2013年在均衡期内地下水处于正均衡状态。(2)区内第四系含水岩组地下水容积储存量为157.488×108m3,侏罗系含水岩组地下水弹性储存量为9.477×108m3。(3)全流域现状地下水开采率为16.40%,新增开采后总的地下水开采率为29.21%,属于较低~合理水平。 相似文献
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两种智能算法在求解地下水管理模型中的对比 总被引：5，自引：0，他引：5
分别将禁忌搜索和遗传算法与地下水流模型MODFLOW和地下水溶质运移模型MT3DMS相耦合,并将其应用于求解地下水资源优化管理模型。在概述两种智能算法基本原理和地下水管理模型组成的基础上,结合两个理想的应用实例,从优化结果和计算效率两个方面对禁忌搜索和遗传算法进行了对比分析。在两个实例中,禁忌搜索分别以高于遗传算法10倍和27倍的计算效率得到了减少抽水流量约160 m3/d和节约治理成本约47万元的治理方案。结果表明,禁忌搜索在求解地下水管理模型中具有较好的应用前景。 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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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 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20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.) 相似文献
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正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology, 相似文献
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正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.) 相似文献
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正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se- 相似文献
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正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with 相似文献