Modelling of groundwater flow in heterogeneous porous media by finite element method     

Hassan Smaoui  Lahcen Zouhri  Abdellatif Ouahsine  Erick Carlier 《水文研究》2012,26(4):558-569

The HySuf‐FEM code (Hydrodynamic of Subsurface Flow by Finite Element Method) is proposed in this article in order to estimate the spatial variability of the transmissivity values of the Berrechid aquifer (Morocco). The calibration of the model is based on the hydraulic head, hydraulic conductivity and recharge. Three numerical tests are used to validate the model and verify its convergence. The first test case consists in using the steady analytical solution of the Poisson equation. In the second, the model has been compared with the hydrogeological system which is characterized by an unconfined monolayer (isotropic layer) and computed by using PMWIN‐MODFLOW software. The third test case is based on the comparison between the results of HySuf‐FEM and the multiple cell balance method in the aquifer system with natural boundaries case. Good agreement between the Hydrodynamic of Subsurface Flow, the numerical tests and the spatial distribution of the thickening of the hydrogeological system is deduced from the analysis and the interpretations of hydrogeological wells. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

砂岩风化晕厚度在广东晚更新世测年中的应用          下载免费PDF全文

程绍平  陈国光 《地震地质》1988,10(4):109

广东地区河流阶地和冲积扇沉积物中砂岩砾石风化晕随时间增厚。风化晕生长速度呈指数衰减,并拟合于下列公式:T 1485D4.13这里T=时间,以年表示,D=沉积物表部约50块砾石风化晕厚度的加权平均值,以毫米表示。利用风化晕厚度确定出广东地区河流第一和第二级阶地分别为1000—13300年和8600—26500年,肇庆盆地北部山前地带第Ⅰ和第Ⅱ级冲积扇分别为51500年和24400年。同时,在构造地貌变形分析的基础上,估算出本区三条主要北东向断裂带在晚更新世—中全新世的垂直断层作用速度为0.6—1.6毫米/年,中全新世甚或晚更新世晚期以来的活动速度极小  相似文献   

Carlsberg Ridge, northern Indian Ocean: gravity and isostasy   总被引：1，自引：0，他引：1  

B. Ashalatha  C. Subrahmanyam  R. N. Singh 《Geophysical Journal International》1994,119(1):69-77

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Deglacial land emergence and lateral upper-mantle heterogeneity in the Svalbard Archipelago—I. First results for simple load models     

Doris Breuer  Detlef Wolf 《Geophysical Journal International》1995,121(3):775-788

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铀矿层真实厚度的确定和最佳测井点距          下载免费PDF全文

秦积庚  谭庆江 《地球物理学报》1990,33(4):468-479

本文讨论了最佳测井点距的选择原理,其最佳值大致为8-12.5cm.并从原理上分析了矿层解释厚度增大的主要原因:根据离散测量值所作的分层解释结果必然导致矿层解释厚度的增大.大量的模型测量结果完全证实了理论分析的正确性,并且还提出了合适的解决办法.  相似文献   

Influence of local geological conditions on the macroseismic effects in the town of Strazhitza     

D. Michailov  R. Glavcheva  S. Dineva  S. Elenkov  B. Konstantinov 《Natural Hazards》1990,3(2):153-160

Damage caused by the earthquake of 7 December 1986 (M = 5.7) and its aftershocks in low-storey residential buildings in the town of Strazhitza, Bulgaria, situated in the epicentral zone are systematized. A scale of damages is compiled for two types of buildings which is coordinated with the MSK-64 scale. The territorial distribution of the seismic intensity is compared with the results of the detailed engineering-geological study. A correlation between the Quarternary deposit thickness and the observed seismic intensity is obtained.Paper presented at the 21st general assembly of the European Seismological Commission held in Sofia, 1988.  相似文献   

博格达峰黑沟8号冰川发育若干问题浅析     

王宗太 《冰川冻土》1991,13(2):141-146,158

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连云港—临沂—泗水剖面重磁异常特征与地壳构造     

李天生 《地震研究》1991,14(2):141-146

本文利用连云港～临沂～泗水剖面的重力测量资料计算出地壳厚度,并与人工地震测深结果进行比较,讨论了该剖面的重磁异常和地壳厚度分布特征。  相似文献   

关于生命起源研究的问题及其主攻方向的探讨   总被引：1，自引：0，他引：1  

王将克  钟月明 《地球科学进展》1995,10(2):196-201

本文综述和分析了近几十年来国内外关于生命起源的研究的问题及各种假说和见解，提出物质的起源是生命起源问题研究的核心，生命起源问题应是研究原始地球的非生命物质如何演变成为生命物质的，地球上分子手性的起源是生命起源问题研究的主攻方向，有机分子光学活性百发生在由化学进化转入生物进化这一过渡阶段。  相似文献   

Lightning optical pulse statistics from storm overflights during the Altus Cumulus Electrification Study   总被引：2，自引：0，他引：2  

D.M. Mach  R.J. Blakeslee  J.C. Bailey  W.M. Farrell  R.A. Goldberg  M.D. Desch  J.G. Houser 《Atmospheric Research》2005,76(1-4):386

The Altus Cumulus Electrification Study (ACES) was conducted during the month of August 2002 in an area near Key West, Florida. One of the goals of this uninhabited aerial vehicle (UAV) study was to collect time resolved optical pulse data from thunderstorms. During the month long campaign, we acquired 5256 lightning generated optical pulses. Most of these observations were made while quite close to the top of the storms. We divided our data into two amplitude groups based on prior NASA U2 aircraft optical data and the pulse characteristics. The group of strong pulses with radiance greater than 2.1 mW m^{− 2} sr^{− 1} had mean and median 10–10% optical pulse widths of 770 and 740 μs, respectively, 50–50% pulse widths of 399 and 355 μs, respectively, and 10–90% risetimes of 292 and 260 μs. These values are very similar to the previous U2 based optical results The other group of pulses consisting of slightly more than a quarter of the total pulses observed had radiances less than the minimum values detected in the U2 study. These weak pulses were narrower than the strong pulses with 50–50% mean and median values of 199 and 160 μs, respectively. Only 12% of the flashes observed contained only weak pulses. The source of these weak pulses is unknown, but we suspect that some are artifacts of the close proximity of the aircraft to cloud top.  相似文献