共查询到20条相似文献，搜索用时 140 毫秒
1.
针对金沙江乌东德水电站坝址区左右两岸地下水中SO42-含量的差异,尤其是左岸SO24-含量普遍高于右岸的特征,通过岩矿和水化学成分分析,采用聚类分析法分析了地下水中SO42-与其他离子成分的相关性,并结合水岩相互作用及水化学场、水温场、水动力场等方面的分析研究,发现坝址区地下水中SO42-的来源主要与地层中的黄铁矿有关,左右两岸地下水中SO42-含量的差异主要由于二岸地下水循环不同所致。 相似文献
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针对金沙江乌东德水电站坝址区左右两岸地下水中SO(2-)4含量的差异,尤其是左岸SO(2-)4含量普遍高于右岸的特征,通过岩矿和水化学成分分析,采用聚类分析法分析了地下水中SO(2-)4与其他离子成分的相关性,并结合水岩相互作用及水化学场、水温场、水动力场等方面的分析研究,发现坝址区地下水中SO(2-)4的来源主要与地层中的黄铁矿有关,左右两岸地下水中SO(2-)4含量的差异主要由于二岸地下水循环不同所致. 相似文献
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康萨依坝址区地下水对普通水泥具硫酸盐型强腐蚀,本文分析了地下水中腐蚀性介质(SO2-4)的来源,预测了水库蓄水后地下水化学成份的变化,并对各水工建筑物区地下水的腐蚀性进行评价。 相似文献
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根据贵州高氟地下水的水化学特征，结合其水文地质和岩石条件等，将其分成两种主要类型，即碳酸盐岩区的高氟地下水和硅质陆源碎屑岩（含浅变硅质陆源碎屑岩）区的高氟地下水，按水－岩作用的机理，探讨了高氟地下水水化学特征形成的地球化学机制。 相似文献
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邓忠文 《地质灾害与环境保护》2012,23(1):45-49
水电工程建设中,坝址区岩体风化特征是最受关注的问题之一。对大渡河中游某电站坝址区花岗岩岩体风化特征进行研究,分析影响其风化特征的控制因素,并指出风化作用对工程的影响。 相似文献
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双河拱坝区主要工程地质特征与灌浆设计 总被引：1，自引：0，他引：1
陈运东 《地质灾害与环境保护》1996,7(2):44-50
双河拱坝坝址区岩体松动，本文在描述坝工程地质特征基础上，对该工程的灌浆设计作了总结，实践证明：灌浆效果良好。 相似文献
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本文在研究清江流域及外围区域地震地质条件和地震分布规律的基础上，划分了１、２个潜在震源区，并确定其相应的地震活动性参数，同时探讨区域地震烈度衰减规律及各潜在震源区对隔河岩和水布垭两坝址的影响烈度、进而复泊松模型，评价两坝址的地震危险性，获得了丙坝址不同期限内的地面峰值加速度及其相应的超越概率。根据对比分析，水布垭坝址的地震危险性比隔洒岩坝址小。 相似文献
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本文通过对渭北东部岩溶地下水环境同位素组成特征的研究，分析了大气降水、地表水、地下水三者之间的转化关系，并对研究区岩溶地下水的形成进行了初步探讨，认为大气降水是研究区岩溶地下水的补给源，地表水与地下水之间存在水力联系，地表水对地下水的补给占补给水源的74.3％。西部岩溶裸露区为岩溶水的直接补给区，其周边浅埋区为岩溶水的间接补给区，东南部的岩溶中-深埋区为岩溶水的径流排泄区。 相似文献
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It is assumed that the groundwater dam under consideration is located in the lower Oshipcheon River along Yeongdeok-gun County, Gyeongsangbuk-do Province, eastern Korea. In this study, changes in groundwater level and construction effects of the groundwater dam were analyzed using a SWAT–MODFLOW model designed for integration of surface water and groundwater, and validity analysis before and after construction of the groundwater dam was evaluated. There are an average increase of 0.46 m and a maximum increase of 1.16 m, respectively, at the upstream region due to the groundwater dam. Groundwater levels at the upstream region show an average increase of 0.42 m by the groundwater dam when the water quantity of demand (10,080 m3/day) is pumped. The groundwater dam has potential as an alternative for the surface water dam to secure water resources in the study area. 相似文献
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韩家哨村位于河北滦县李家屿灰场北部谷地,地势低于灰场,距离约800m。灰场运行期间,该区地下水出现水位升高及水质变差等问题。本文从水文地质条件角度,详细研究灰水的运移途径及其对该区地下水的影响。韩家哨村区域地下水系统分为上层滞水和孔隙一裂隙（溶隙）潜水含水层系统。潜水含水层系统水力传导系数为172．6～203．4m^2／d。地下水补给主要来源于韩家哨村以南坝后地形较高区域及灰水。灰水渗漏优势区韩家哨村南部宽约200m的带状区域。灰场堆灰形成新的地下水分水岭致使灰水在20副坝坝前垂直下渗进入风化带,沿白云岩裂隙（溶隙）补给潜水含水层,并向韩家哨村区域流动补给孔隙含水层,改变后的潜水部分通过民井向外排泄。 相似文献
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Ahmet Apaydin 《Environmental Earth Sciences》2009,59(2):339-345
In central Turkey, there are serious groundwater quality problems in the main river valleys and plains, and even in the lower parts of the secondary basins due to the underlying evaporitic geological formations. Groundwater quality improves towards the upstreams in the alluvium aquifers in most secondary valleys; however, groundwater potential decreases as well due to the reduced basin area, areal extent and thickness of the aquifers. The Malibogazi valley is situated to some 100 km north of Ankara. The dam constructed in the narrowest section of the valley has an average storage coefficient of 0.2 and the total and active storage capacities of 110,000 and 55,000 m3, respectively. The 20-m-thick aquifer extends for 6–7 km till the dam site within valley with an average width of 50–70 m. It mostly comprises sandy–gravely alluvial deposits. Malibogazi groundwater dam is a valve-controlled gravity flow dam. When the valves are opened, the water from the aquifer reservoir flows by gravity through supply pipe to the main irrigation channel, but when the valves are closed the water is stored in the aquifer and groundwater level begins to rise. Average groundwater discharge was about 20 l/s in 2005–2006 irrigation period. In this period, groundwater levels were about 2 m higher compared to the groundwater levels in the same seasons before the construction of the groundwater dam. Because the dam is of gravity flow type, it means an important contribution to the farmers since the operation cost is quite low. Malibogazi groundwater dam represents one of the first experiences of Turkey in the field of groundwater storage. Although the dam has small storage capacity, it may be a model for Turkey from the viewpoints of investigation, construction, dam wall, intake facility and measurements etc. 相似文献
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龙凤山土石坝在运行的很长一段时期内,坝后排水沟出现严重的混水现象,该现象白天呈周期性变化。利用原子吸收法和X-荧光光谱分析法,对坝后排水沟中的水及析出物进行化学成分分析,研究坝基析出物化学成分的演变规律。研究表明,水质中富含Ca,析出物中富含Fe和Mn。在坝基地下水渗流过程中,地下水与坝基岩石产生物理化学作用,从而导致化学潜蚀。地下渗流水的化学潜蚀作用与坝基岩石性质密切相关。在基性类岩石中,由于富含铁、锰等深色元素,在酸性环境中很容易迁移,因而排水沟中出现Fe2O3和MnO2絮凝状沉淀物,导致排水沟出现混水现象。 相似文献
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Geophysical and hydrological investigations at the west bank of Nile River (Luxor, Egypt) 总被引：6，自引：5，他引：1
M. Elwaseif A. Ismail M. Abdalla M. Abdel-Rahman M. A. Hafez 《Environmental Earth Sciences》2012,67(3):911-921
Luxor, the modern Egyptian city that occupies the site of ancient Thebes, is famed for its magnificent ancient monuments. Since 1967, the Aswan high dam has prevented the annual flooding of the Nile River, resulting in excessive salt accumulation on the Nile floodplains and on exposed monument surfaces. In addition, the expansion of agricultural land within the Luxor study area has resulted in increased salinity and groundwater level. These conditions accelerate the degradation of buried and exposed monuments that were fairly well preserved in the past. To mitigate this problem, it is necessary to first understand the near-surface setting and the groundwater conditions of the Luxor area. A geophysical investigation was carried out using resistivity and electromagnetic surveys. In addition, a chemical analysis was conducted of some surface water samples collected from canals and the sacred lake of Memnon Temple. Based on the results of the geophysical surveys and the chemical analysis of the water samples, the shallow subsurface was characterized into four geoelecterical units. Groundwater flow directions were determined to be from the central area to the west, causing a rise in the groundwater levels and groundwater salinity in the area of monuments. 相似文献
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岩溶介质具有较强的非均质性,其地表及地下的岩溶结构形态多样。通过对钻孔结构描述、钻孔水物化性质分析,不仅能够掌握区域上岩溶含水层的结构特征,而且对于岩溶地下水演化过程的揭示亦有重要作用。文章以桂林岩溶水文地质试验场西南部峰丛山区与峰林平原交界处的钻孔为例,通过野外便携式多参数仪原位测试钻孔垂向水物化指标（pH值、水温T、电导率EC）,探索浅部（地面以下约50 m内）地下岩溶较为发育条件下钻孔水物化指标的垂向变化特征,揭示岩溶介质非均质性对钻孔垂向水物化指标的影响。结果表明:岩溶地区小范围内不同钻孔间的水物化性质有所差异,且岩溶发育相似的钻孔（如ZK4/ZK5、ZK7/ZK8）,其水物化指标垂向变化具有一定的相似性,但不同指标（T、pH、EC）的变化幅度存在差异;钻孔水物化性质受到试验场区岩溶介质结构非均质性的控制,即岩溶介质结构影响了地下水的赋存条件和水力联系而导致水物化性质的差异;在对岩溶地区地下水物化性质进行研究时应充分考虑岩溶介质的非均质性特征,根据实际的水文地质条件选取具有代表性的钻孔含水段进行取样和监测。 相似文献
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北盘江流域沿线山高谷深,岩溶水文地质条件复杂,局部区域水资源短缺,岩溶渗漏问题成为水利水电工程建设的瓶颈。文章综合地质调查测绘、钻探及物探、水文地质试验、岩溶水系统分析、地下水均衡分析等方法,论证了PCH水库不会发生邻谷渗漏及绕坝基深部的岩溶管道型渗漏,但发生溶隙型渗漏的可能性较大。采用有限元法模拟溶隙渗漏显示:随着T1yn1-1灰岩溶蚀率的增大,坝基抗滑稳定系数稍有降低,潜在失稳模式为后缘剪断T1yn1-2岩体,前缘沿T1yn1-2层内岩屑夹泥型软弱结构面剪出;坝基渗漏量呈线性增加,T1yn1-1灰岩溶隙密集带为坝基主要渗漏区。当溶隙密集带沿T1yn1-1灰岩与T1yn1-2泥灰岩接触带水平发育且集中分布时,坝基抗滑稳定系数将明显减小,坝基渗漏量将明显增大;当溶隙密集带垂直发育、分散发育或主要分布于坝后区域时,其对坝基抗滑稳定及坝基渗漏量影响微弱。岩溶水文地质分析及数值模拟均显示,复杂岩溶水系统势汇区下游区域多以溶隙渗漏为主,其工程影响有限,具备建坝成库条件。 相似文献
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关于地下水库几个问题的探讨 总被引：38，自引：3，他引：38
赵天石 《水文地质工程地质》2002,29(5):65-67
本文重点探讨了地下水库的基本概念，分类和它的组成，包括由天然储水构造组成的地下水库库区，拦截地下径流的地下坝，地表拦水工程和引渗工程，地下水开发工程4个基本部分和其它组成部分，还探讨了地下水库的优势和问题。 相似文献
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Relationship between groundwater properties and soil salinity at the Lower Nam Kam River Basin in Thailand 总被引：2，自引：1，他引：1
Uma Seeboonruang 《Environmental Earth Sciences》2013,69(6):1803-1812
The Lower Nam Kam River Basin lies in the vicinity of the Mekong River and is located in the eastern section of the Nakhon Panom Province in northeastern Thailand. Drought, particularly in the winter and summer seasons, is the main environmental challenge in this area. In addition, soil becomes saline and groundwater is brackish in some locations. This problem worsens the drought crisis in the area. Groundwater is known to closely relate to the soil salinity distribution. To successfully manage highly saline areas, saline groundwater and soil properties must be evaluated together. Therefore, the main objective was to study the shallow groundwater physical and chemical properties in conjunction with surface soil salinity. Soil samples were collected and measured for physical and chemical properties. Shallow groundwater was measured for depth from ground surface and sampled from the sites in the study area. The water samples were measured for pH, total dissolved solids, electrical conductivity, and salinity. Results were interpolated and displayed via a geographic information system and further analyzed by simple linear regressions between surface soil salinity and the other factors. The results show that the topsoil contaminated with salinity is typically situated in relatively low areas with shallow groundwater levels and low head gradient of groundwater. This is due to the characteristics of the soil profile and groundwater depth. 相似文献