共查询到20条相似文献，搜索用时 109 毫秒
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地下水资源评价与地下水可开采量计算,需要对地下含水层组参数进行分析确定。本文结合鲁北地区两个地下水水源地采用抽水试验确定承压含水层水文地质参数的实践,探讨定流量(单孔或多孔)抽水试验确定含水层参数的可行性,并对定降深抽水试验确定水文地质参数方法进行了探索。 相似文献
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玉溪市萝卜子地水源地地下水允许开采量评价 总被引：1，自引：0，他引：1
萝卜子地供水水源地,水文地质条件较复杂。利用多年地下水动态及抽水试验资料上,进行基岩富水地段地下水的补给量计算,以补给量作为该水源地的允许开采量合理。 相似文献
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地下水资源是北京供水系统的支柱,设立地下水水源地保护区,是保护水源地最大可能免受人类活动影响、保证水质安全的重要措施。论文以北京市某典型水源地为例,在收集相关水文地质勘查、长期动态观测、水源地开采现状、规划及周边污染源调查等成果资料的基础上,建立了地下水系统水文地质概念模型,模拟出地下水流场。通过质点追踪技术,计算水源地水力捕获带范围。综合考虑水源地周边地形、地物和潜在风险污染源等因素,确定了水源地保护区的范围。结果表明,数值模拟法能客观详细地刻画实际地下水含水层的结构与水文地质条件,划分结果可靠、准确,能为地下水管理部门提供有效合理的保护依据。 相似文献
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山东省汶泗河冲洪积平原轴部第四系厚度较大,孔隙地下水分层分布,由于补给径流条件不同导致其水质差别较大,研究含水层间的水力联系对于水资源管理及优质地下水可持续开发利用等具有十分重要的意义。采用群孔抽水试验方法研究苑庄水源地浅层和深层孔隙水之间的水力联系。群孔抽水后6眼抽水井水质指标整体高于抽水前,附近有串层水井的抽水井增加最大,4项指标平均升高1.07倍。抽水试验期间深层观测孔水位变化与抽水井相一致;浅层观测孔水位除有串层的孔稍有下降趋势外,其它孔均呈现自然波动状态。附近有串层水井的抽水井抽水量中浅层孔隙水的补给量比例比其它抽水井要高4倍。抽水前后水质、抽水期间水位动态变化规律、抽水井抽水量中浅层孔隙水补给量占比均表明深层孔隙水在开发利用过程中会受浅层孔隙水影响,但是可通过合理止水减弱含水层之间的水力联系。 相似文献
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根据1991—1998年在寿阳一带进行的供水水文地质勘查成果，及任家店矿泉水水源地稳定流抽水试验成果，对矿泉水水源地的允许开采量进行评价，保护地下水资源环境，在开采期间不发生危害性的环境水文地质问题，为寿阳任家店奥灰矿泉水的开发提供参考： 相似文献
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干旱半干旱区的地下水开发利用容易对原本脆弱的生态环境造成不利影响。内蒙古鄂尔多斯市浩勒报吉水源地属于半干旱区的地下水水源地。2009—2014年间,该水源地为满足工业供水需求开采地下水6.0×104~7.3×104 m3/d,产生了负面的生态环境后果。为核查环境变化与地下水开采的确切关系,调查分析了2004—2016年气象条件、地下水开采历程、地下水位、湖泊面积和植被指数的变化特征,建立定量指标进行了地下水开采的环境影响判别。结果表明,在2008—2014年期间,距开采区中心10 km范围的地下水位普遍下降1 m以上,奎生淖和敖各窖淖2个湖泊的面积萎缩约30%,水源地的植被指数对气候条件变化的敏感性增强。该水源地以往论证得到的可开采量偏大,应考虑生态环境约束将开采规模控制在3×104 m3/d以下。 相似文献
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Analysis of flow behavior in a landfill with cover soil of low hydraulic conductivity 总被引：2，自引：1，他引：1
Y. -S Jang 《Environmental Geology》2000,39(3-4):292-298
This paper presents the results of field tests of hydrologic parameters in a landfill and the results of numerical simulation
to find the efficiency of the pumping method to reduce leachate levels in the landfill. The field hydraulic conductivity and
storativity of waste and buried cover soils in the landfill are measured by pumping and slug tests. The hydrologic condition
inside the landfill is first calibrated using the drawdown-time curve obtained from the pumping test, and the flow behavior
of leachate during pumping in the landfill, when various layers of waste and buried cover soil exist, is analyzed through
three-dimensional numerical simulation of flow. The results of the field investigation show that the buried cover soil of
low hydraulic conductivity forms an impermeable layer preventing the downward flow of leachate and upward flow of landfill
gas. The hydraulic conductivities of the pumping test and slug tests were quite close on the same order of magnitude. It was
also possible to match the drawdown-time data of the field tests with those of the model using input data close to the hydrologic
property obtained from the field tests. The numerical flow analysis showed that pumping was possible up to 120 tons/day for
a single well without a drain, while the pumping rate could be increased to 300 tons/day for the same well with the drain.
From the vertical section of the flow vector with a horizontal drain, the barrier role of buried cover soil is identified,
which was proposed by examining the water contents of the disposed cover soil and waste in the field.
Received: 15 May 1998 · Accepted: 4 January 1999 相似文献
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Hydrogeologic characteristics of the alluvial tuff aquifer of northern Sahand Mountain slopes, Tabriz, Iran 总被引：3，自引：0，他引：3
The Tabriz area is a densely populated area of northwestern Iran (more than 1.5 million in population) with a large proportion of its drinking, domestic, industrial and agricultural water supplied from groundwater resources. The average rate of drinking and industrial water use in the city of Tabriz is about 3.45 m3 s–1. The Plio-Pleistocene unconfined alluvial tuff aquifer (about 1,275 km2), the most important aquifer in the area, has been known for many years as a reliable resource. The greatest estimated thickness of the alluvial tuff lies in the Saidabad area, with 350 m thickness. There are 994 deep and 284 shallow active pumping wells and 83 qanats operate in the alluvial tuff aquifer. The total water withdrawal from all these artificial discharge points has been measured at 72, 3.8 and 17 million m3/year, respectively. Analytical and numerical methods have been applied to the constant rate pumping test data from the Saidabad wellfield (eight pumping and three observation wells). The values of electrical conductivity in the groundwater of alluvial tuff aquifer range from 203 to 960 μS cm–1 and bicarbonate type water dominates. 相似文献
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抽水试验中,动水位数据采集记录及处理分析对水文地质参数计算具有重要意义。近年来自动水位计被广泛用于抽水试验,通过传感器压强水头变化值获取水位降深。因井管内水流动会产生水头损失,自动水位计安放位置不同会导致获取的井水位降深不同,不同于传统方法测得的井水面降深,对水文地质参数计算将产生一定影响,因此如何合理放置自动水位计以及在参数计算中如何应用其获取的水位降深都亟待开展试验研究。在黑河流域第四系大厚度含水层地区,选择典型单层试验孔和利用分层封隔技术实现的一孔同径多层抽水孔开展试验研究,在动水位以下抽水试验层段上部、中部、下部以及潜水泵上部和下部分别放置自动水位计进行了系统的数据采集分析。结果表明:抽水试验中因井管内水流沿程水头损失及速度水头差异导致不同位置自动水位计获得压强水头变化值不同,本次试验实测到井筒内不同部位井损值;井损值在潜水泵进水口处最大,随距潜水泵距离的增大而减小,为避开井筒内较大水头损失对参数计算的影响,自动水位计宜优选安放在潜水泵上部接近动水位位置;在单孔抽水试验中利用稳定流公式计算水文地质参数时,自动水位计获取水位降深含井损不可忽略,需通过多落程抽水试验数据分析扣除后使用。同时,抽水试验中自动水位计不同位置获取数据的处理分析方法为更好地理解井中水头损失提供了依据。 相似文献
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开采条件下多时段水量均衡法的应用研究 总被引：1，自引：0，他引：1
根据大武水源地多年大强度持续超采呈现出来的岩溶水的补、迳、蓄、排特征和水位、水量长期监测资料,在传统水均衡法的基础上提出了开采条件下多时段水量均衡法,并将其应用于大武水源地的可采量计算中。最后,依据评价结果建立了不同开采条件下大武水源地可采量预测模型。 相似文献
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A tanker truck overturned releasing about 11,350 l of aviation fuel. As two municipal supply wells were within about 396 m
of the release, contaminated soil was excavated and an assessment of hydrologic conditions was completed. A recovery well
(RW) and five monitoring wells were installed. Ground-water samples were collected periodically from these wells and the municipal
supply wells for analysis for volatile organic compounds. Pumping tests were completed on the RW and one municipal supply
well. The results of the pumping test on the RWs were used to design a remediation system to remove jet fuel components from
the ground water. The pumping tests also demonstrated that there was a ground-water divide separating the spill site from
the municipal supply wells. After about 7 months of remediation, samples from the RW and municipal supply wells were clean
and the state issued a clean closure. 相似文献
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利用地下水流数值模拟软件Modflow耦合大型抽水试验和长观孔水位两个模型的方法,对含水层参数进行了识别与校验,该方法求得的含水层参数避免了只利用抽水试验模型校验所带来的不确定性。同时利用抽水实验数据进行抽水与恢复的全过程曲线拟合,水位降深模拟相对误差小于6％,并且对均衡水量、泉水的溢出量以及末流场拟合程度进行了分析,均衡水量模拟相对误差最大为2．6％,泉水溢出量模拟相对误差最大为8．14％,末流场拟合程度也较好,从而提高了含水层参数的准确性。实例研究表明,这种求参方法精度高、切实可行,可以推广到其他的含水层参数确定中。 相似文献
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The origin and movement of groundwater are the fundamental questions that address both the temporal and spatial aspects of ground water run and water supply related issues in hydrological systems. As groundwater flows through an aquifer, its composition and temperature may variation dependent on the aquifer condition through which it flows. Thus, hydrologic investigations can also provide useful information about the subsurface geology of a region. But because such studies investigate processes that follow under the Earth's shallow, obtaining the information necessary to answer these questions is not continuously easy. Springs, which discharge groundwater table directly, afford to study subsurface hydrogeological processes.The present study of estimation of aquifer factors such as transmissivity (T) and storativity (S) are vital for the evaluation of groundwater resources. There are several methods to estimate the accurate aquifer parameters (i.e. hydrograph analysis, pumping test, etc.). In initial days, these parameters are projected either by means of in-situ test or execution test on aquifer well samples carried in the laboratory. The simultaneous information on the hydraulic behavior of the well (borehole) that provides on this method, the reservoir and the reservoir boundaries, are important for efficient aquifer and well data management and analysis. The most common in-situ test is pumping test performed on wells, which involves the measurement of the fall and increase of groundwater level with respect to time. The alteration in groundwater level (drawdown/recovery) is caused due to pumping of water from the well. Theis (1935) was first to propose method to evaluate aquifer parameters from the pumping test on a bore well in a confined aquifer. It is essential to know the transmissivity (T = Kb, where b is the aquifer thickness; pumping flow rate, Q = TW (dh/dl) flow through an aquifer) and storativity (confined aquifer: S = bSs, unconfined: S = Sy), for the characterization of the aquifer parameters in an unknown area so as to predict the rate of drawdown of the groundwater table/potentiometric surface throughout the pumping test of an aquifer. The determination of aquifer's parameters is an important basis for groundwater resources evaluation, numerical simulation, development and protection as well as scientific management. For determining aquifer's parameters, pumping test is a main method. A case study shows that these techniques have been fast speed and high correctness. The results of parameter's determination are optimized so that it has important applied value for scientific research and geology engineering preparation. 相似文献