共查询到19条相似文献，搜索用时 234 毫秒
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在国际通用的地下水数值模拟软件中,GMS软件以其友好的使用界面,强大的前、后处理功能及其良好的三维可视效果应用越来越广泛。在对GMS软件中SEEP2D模块进行简单介绍的基础上,以坝堤剖面渗漏为例介绍SEEP2D模块在地下水数值模拟计算中的应用。 相似文献
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基于TOUGH2数值模拟器中存在处理复杂地质条件难的问题,提出了将三维地质模型与TOUGH2数值模型耦合的具体思路和方法,并在Windows平台上编制了相应的程序,利用该程序可以直接将地质模型（如GMS和Petrel建立）与TOUGH2的数值模型进行有机融合,并进行了算法验证。通过CO2地质储存的实例,可以看出地层构造对CO2的空间运移起着控制作用,模拟结果显示CO2会沿着背斜面地层进行运移扩散。因此通过此转换程序,能够增强TOUGH2模拟器处理地层起伏、断层、褶被等常见地质构造,以及地质属性随空间变化的地质体,提高了模拟器的使用效率。 相似文献
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地下水模拟系统(GMS)软件 总被引：55，自引：4，他引：55
祝晓彬 《水文地质工程地质》2003,30(5):53-55
国外在应用通用标准软件进行地下水数值模拟时,GMS软件以其友好的使用界面,强大的前处理、后处理功能及其优良的三维可视效果正受到人们越来越广泛的应用。本文在对GMS软件各模块进行简单介绍的基础上,对其优缺点进行了分析。并结合实际应用经验,列举了该软件在使用过程中常遇到的一些典型问题,以供使用GMS软件的工作人员借鉴。 相似文献
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北京市平原区地下水流动数值模型应用研究 总被引：1，自引：0，他引：1
以北京市平原区地下水系统作为研究对象,系统地收集整理了相关的地质和水文地质资料,通过对资料的综合分析,对边界条件、含水层结构等进行合理概化,建立了水文地质概念模型。在此基础上,运用MODFLOW软件建立了北京市平原区地下水流动的三维数值模型。模型垂向上剖分为10层,平面上每层剖分为499行×499列不规则矩形网格,有效单元共计1 103 000个,以刻画复杂的含水层结构和地下水三维流动特征。依据实测地下水位数据进行模型参数识别与校正,绝大多数计算水位与实测水位拟合较好,模拟流场与实测流场吻合,参数符合水文地质条件,表明本研究建立的数值模型能够较好地刻画北京平原区地下水流动特征。 相似文献
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Visual MODFLOW在大庆龙西地区地下水数值模拟中的应用 总被引：14，自引：2，他引：14
Visual MODFLOW是综合MODFLOW、MODPATH、MT3D、RT3D和WinPEST等地下水模型而开发的可视化地下水模拟软件，具有水的质点向前、向后示踪流线模拟、任意区域的水均衡、简化数值模拟数据前处理和后处理，将模拟的复杂性降到最小等特点。龙西地区是大庆油田新增水源地，使用Visual MODFLOW在该地区进行了地下水资源的模拟与预报，建立准三维模型，发现PCG2求解方法精确度最高。另外，把随机模型和MODFLOW模型相结合，解决了边界水位在计算中不断变化的问题。按照设计开采量对地下水水位进行预报，根据模型预报结果，水：原地设计开采量是可行的。Visual MODFLOW成功地运用于大庆龙西地区地下水资源的评价，操作简便，预报准确、可靠，说明具有很好的应用和推广前景。 相似文献
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广州江村水源地岩溶地下水流场数值模拟 总被引：1，自引：0，他引：1
采用GMS软件建立江村水源地岩溶地下水水文地质概念模型,利用MODFLOW模块模拟了岩溶地下水分布。模型识别、验证结果表明,所建立模型达到精度要求,真实地反映了该区域地下水水力特征,为该地区地下水污染调查评价奠定了基础。 相似文献
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地下水数值模拟软件GMS提供了基于钻孔资料的三维地层生成模块,借助于GMS软件中地层模拟模块,利用钻孔数据、地层剖面资料、地质图和DEM数据,结合虚拟钻孔方法,构建了复杂地质结构区—北京顺平地区三维地层结构模型,模型包括太古宇密云群,长城系、蓟县系、青白口系、寒武系、奥陶系、石炭—二叠—侏罗系、深层第四系和浅层第四系等9组地层,刻画出了各层分布的空间范围,模拟了山区地表高程的起伏变化、断层产生的地层错动等情况,为研究区地质和水文地质条件分析及地下水数值模型的建立奠定了基础。 相似文献
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Rakesh K. Kushwaha M. K. Pandit Rohit Goyal 《Journal of the Geological Society of India》2009,74(4):449-458
A direct approach to designing MODFLOW finite difference model is tedious and less intuitive, specifically for complex boundary
and initial conditions. Therefore, a MODFLOW model can be developed either using a grid or conceptual model approach. The
conceptual model is created using Geographic Information System (GIS) objects including points, arcs and polygons so that
it can more accurately represent real world condition. It is a simplified representation of the site to be modelled including
the model domain, boundary conditions, sources, sinks and material zones. Advantage of conceptual model is that most of the
input can be in terms of physical objects, such as wells, lakes, recharge zones etc which can then be converted to a grid
based mathematical model with the help of preprocessor software.
This paper presents the results of a mathematical groundwater model developed for the northern part of Mendha sub-basin in
the semi arid region of northeastern Rajasthan, employing conceptual groundwater modelling approach. For this purpose, Groundwater
Modelling Software (GMS) was used which supports the MODFLOW-2000 code. For the purpose of modelling the Source/ Sink Coverage,
Recharge Coverage, Extraction Coverage, Return Flow Coverage and Soil Coverage were considered. The model was calibrated against
the historical and observed water level data for periods 1998 to 2003 and 2003 to 2005 respectively. 相似文献
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基于MODFLOW参数不确定性的地下水水流数值模拟方法 总被引：1，自引：0，他引：1
考虑到模型不确定性引起的地下水数值模拟不确定性对模拟过程的影响,在简要介绍含水层水文地质参数变异性研究进展和地质统计学的基础上,基于常用的确定性地下水流数值模拟软件MODFLOW开发了MODFLOW-Gslib软件,相较于传统的数值模拟方法,将地质统计学与数值模拟结合的方法能够模拟非均质含水层中的参数变异性问题。将MODFLOW-Gslib软件运用于模拟实例中,选择常见的不确定性因素进行模拟,并对其模拟产生的数据进行统计分析,结果表明,软件转化后的参数符合水文地质参数不确定性的相关特征;与原模拟结果进行对比,该软件能够更加真实地刻画含水层参数变异性特征。 相似文献
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Hossein Banejad Hamid Mohebzadeh Mohammad Hossein Ghobadi Majid Heydari 《Journal of the Geological Society of India》2014,83(1):83-92
Numerical simulation of groundwater flow used for the estimation of hydraulic and hydrologic parameters which is an important tool for the management of aquifers. This study presents the results of a mathematical model developed for the simulation of groundwater flow in Nahavand plain aquifer in the southwest Hamadan province. For this purpose Groundwater Modeling Software (GMS) was used which supports the MODFLOW-2000 code. After gathering required data such as the hydrological, hydrogeological and topography maps, a 3D hydrogeological model of plain was constructed with borehole and surface elevation data. Then MODFLOW was used for simulation of flow. After initial simulation of the flow, the model was calibrated in steady state with trial-and-error and parameter estimation methods the observed head of groundwater table monitoring data of 1997. Results of calibration show that error between observed head and computed head is in allowable range. Also results of computed head with model show that groundwater flow is in the direction of the dominate slope (southeast to northwest). Finally MODPATH code which simulates advective transport of particles was used for estimation of flow path and source of contaminants. 相似文献
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地下水流系统理论和数值模拟技术分别是水文地质学的基本理论和技术方法,含水岩组的概化是地下水流系统分析和地下水数值模拟的重要基础,直接影响着数值模拟和水流系统分析的精度和可信度.为提高含水岩组概化的精度和可信度,提出一种含水岩组概化的新方法,即累积导水系数法.依据岩层厚度与渗透系数乘积累积值随深度的变化,以及水文地质剖面岩性分布的整体特征,概化含水介质结构.以玛纳斯河流域为例,应用该方法概化流域内的岩性剖面,结合GMS软件中TINS模块构建水文地质结构模型.结果表明,应用该方法概化后的含水层结构具有较好的合理性和仿真性,建立的三维模型很好地显示了研究区含水介质的空间展布特征,为建立地下水流模型奠定了良好的基础. 相似文献
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Fadi Chaaban Hanan Darwishe Barbara Louche Yvonne Battiau-Queney Eric Masson Jamal El Khattabi Erick Carlier 《Environmental Earth Sciences》2012,65(1):183-193
The use of geographic information system (GIS) minimizes the effort and improves the efficiency of numerical models. The GIS
provides a platform for high capacity collection, management, manipulation, analysis, modeling and display of spatial data.
The conceptual model is created using GIS objects including points, arcs and polygons so that it can accurately represent
real world condition. According to the research problem, the geographical model is based on Hypergraph Based Data Structure
method, and a conceptual data model has been created from which a physical data model was elaborated in ArcGIS9.3 platform.
The groundwater modeling system (GMS) provides a powerful tool for hydrodynamics modeling and it is able to solve complex
problems such as the groundwater flow and seawater intrusion. The sand-dune system of Hardelot-Plage (North of France) suffers
from a lack of well-developed foredune. This problem is linked to the almost constant saturation of beach sand which is the
potential source of dune nourishment. In the south of Hardelot, the coastline is slowly, but constantly retreating. To remedy
this situation, a coupling between a GIS and GMS was adopted, in order to find the possible scenarios which could lower the
piezometric surface in the concerned area and allow dune nourishment again. The GMS used supports the Modflow-2000 code. A
direct approach to designing Modflow finite difference model is tedious and less intuitive, specifically for complex boundary
and initial conditions. Therefore, a Modflow model can be developed either using a grid or conceptual model approach. The
preparation of input data modeling is tedious and takes a long time. The model created in GMS was calibrated against the historical
and observed water level data for 1995–2006. Then a hydrodispersive model (MT3d code in GMS) was launched for evaluating sea-water
intrusion. The model was run to generate groundwater and salt concentration scenario during pumping tests. 相似文献
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Assessing potential repositories for geologic sequestration of carbon dioxide using numerical models can be complicated, costly,
and time-consuming, especially when faced with the challenge of selecting a repository from a multitude of potential repositories.
This paper presents a set of simple analytical equations (model), based on the work of previous researchers, that could be
used to evaluate the suitability of candidate repositories for subsurface sequestration of carbon dioxide. We considered the
injection of carbon dioxide at a constant rate into a confined saline aquifer via a fully perforated vertical injection well.
The validity of the analytical model was assessed via comparison with the TOUGH2 numerical model. The metrics used in comparing
the two models include (1) spatial variations in formation pressure and (2) vertically integrated brine saturation profile.
The analytical model and TOUGH2 show excellent agreement in their results when similar input conditions and assumptions are
applied in both. The analytical model neglects capillary pressure and the pressure dependence of fluid properties. However,
simulations in TOUGH2 indicate that little error is introduced by these simplifications. Sensitivity studies indicate that
the agreement between the analytical model and TOUGH2 depends strongly on (1) the residual brine saturation, (2) the difference
in density between carbon dioxide and resident brine (buoyancy), and (3) the relationship between relative permeability and
brine saturation. The results achieved suggest that the analytical model is valid when the relationship between relative permeability
and brine saturation is linear or quasi-linear and when the irreducible saturation of brine is zero or very small. 相似文献
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Canul-Macario Cesar Salles Paulo Hernández-Espriú Antonio Pacheco-Castro Roger 《Hydrogeology Journal》2021,29(7):2347-2362
Numerical modelling is increasingly used as a tool for improving management strategies in aquifers and to support the design of comprehensive projects considering natural and anthropogenic processes. Overall, numerical simulation in karstic aquifers poses a major scientific challenge due to the non-Darcian groundwater flow dynamics. In specific cases, the equivalent porous medium approach has shown acceptable results, particularly in poorly karstified aquifers with regional/subregional scales such as this case. The Yucatan coastal karstic aquifer (Mexico) has been defined as a complex regional heterogeneous system, partially confined, thus allowing the discussion of multiple conceptual models. In this research, a two-dimensional numerical model of flow and transport was implemented using SEAWAT for the NW Yucatan aquifer. Four likely conceptual models were audited, calibrated and verified using hydrogeological field data, to select the best one, considering their fit and complexity. The numerical model accuracy was evaluated using the root-mean-square error, Nash Sutcliffe efficiency and the Pearson coefficient. The Akaike information criterion and Bayesian information criterion were included for evaluating the complexity of the numerical models. In addition, the signal of tide propagation into the aquifer was assessed as a proxy to improve the numerical calibration process. Results show that the most complex numerical model has a better calibration than the simpler models, but the model accuracy is worse when compared to less complex numerical models in the verification exercise. This research offers enhancement in the knowledge of numerical modelling in heterogeneous coastal aquifers within a conceptual-model uncertainty setting.
相似文献19.
Thirty years(1984–2014) of groundwater science teaching and research in China: A dissertation-based bibliometric survey 
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下载免费PDF全文 ZHAI Yuan-zheng JIANG Shi-jie TENG Yan-guo WANG Jin-sheng GU Hong-biao XIE Liang YIN Zhi-hua 《地下水科学与工程》2015,3(3):222-237
In order to track the footprint of groundwater science teaching and research in China during the past years, a bibliometric analysis was conducted based on the database of China National Knowledge Infrastructure (CNKI), which covered the time span from 1984 to present and included more than 2.6 million master and doctoral dissertations from hundreds of institutions of Mainland China. The bibliometric analysis summarized output, geographical, and institutional patterns, as well as research directions and hotspots in groundwater studies in China in the period of 1984-2014. A total of 1 396 groundwater-related dissertations including 1 161 master dissertations and 235 doctoral dissertations, contributed by 128 institutions distributed in 53 cities nationwide, were searched out in the database. It can be seen obviously that, the groundwater science teaching and research in China has experienced a notable growth in the past three decades especially during 2000-2014. Groundwater modeling, resource, and exploitation were the top three major subject categories; China University of Geosciences (Beijing), Jilin University and Chang’an University were the top three productive institutions together accounting for more than one third of the total dissertations and 50% of the doctoral dissertations, which further prompted the cities (Beijing, Changchun, and Xi’an) to become the top three productive cities. The dissertations generally covered all the international research topics, which indicated that hydrogeologists in China have tracked the international frontier closely during the past decades. The keywords analysis revealed that, (1) numerical modeling was still the hottest topic and PHREEQC, MODFLOW, GMS, and FEFLOW were the four most used softwares; (2) the topics related with groundwater pollution and quality developed steadily and rapidly; (3) environmental isotopes and GIS were frequently used tools for hydrogeological condition analysis, and spatial data processing respectively; and (4) the unsaturated zone as an integral part of aquifers attracted more and more attentions from hydrogeologists focus on saturated zone. 相似文献