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1.
Cheng-Chao Lee Louis Loung-Yie Tsai Chieh-Hou Yang Kuo-Liang Wen Zi-Bin Wang Zhi-Hsian Hsieh Hsing-Chang Liu 《Environmental Geology》2009,58(7):1397-1406
A slope on the west border of the foothill near 921 surface rupture (caused by the 1999 Chi-Chi earthquake) in central Taiwan
shows distinctive topographic expression that was prone to be considered as a fault scarp formed by a preexisting active fault.
The 2D and 3D resistivity images clearly delineate rock surfaces which show steep, deep, gentle, and subvertical displacement
beneath the slope, the toe of slope, the non-lateritic terrace, and 921 surface rupture, respectively, which can be attributed
to the significant contrast of resistivity between gravel and rock. The horizontal sand bed and clast-supported gravel were
deposited in a fluvial environment, whereas wedge-shaped gravel and colluvium were scarp-induced colluvial deposits in the
trench profile. The layers shown in the depth of excavation, except for rock, has no offset or disturbance by fault ever since
at least 2,480 ± 50 year B.P., based on carbon 14 dating of charcoal sample at the bottom of trench profile. According to
information from two boreholes close to the slope, an over 20-m-thick marker bed with transported shell fragments, was found
for correlation. This correlation further implies the slope was not formed by fault. On the other hand, two boreholes which
are far from the slope and located on the flat non-lateritic terrace frequently show fractured and sheared features. By comparison,
the locations around these two boreholes indicate a reverse fault or faults that occurred before the deposition of gravel.
Later on, the paleostream was developed along the foot of fault scarp that was subjected to erosion and led to subsequent
retrogression or retreat of the slope. Consequently, the incision of paleostream is believed to be responsible for the high
relief of rock surface around the slope. Furthermore, from resistivity and borehole data, the rock surface underlying terrace
is gentle where no faults occur after the deposition of gravel. The result of RIP crossing the 921 surface rupture displays
about 10 m difference in elevation of rock surface on both sides, which is greater than that of 3–4 m caused by Chi-Chi earthquake.
This indicates that the 921 surface rupture is a preexisting thrust fault that resulted from several thrusting events since
terrace gravel was deposited. So it is not necessary to establish an extra restricted zone for construction in study area,
except close to the 921 surface rupture. 相似文献
2.
古水水电站工程区域堆积体边坡工程地质分析 总被引：1，自引：0，他引：1
西南地区水电工程中堆积体边坡的稳定性问题研究对水电工程建设极为重要。堆积体边坡研究中比较关键的问题包括:堆积体的历史成因、不同条件下的力学参数取值和稳定性分析。本文通过对古水水电站坝址区域内下覆为板岩、上覆为堆积体的工程地质条件进行了相关分析,得到了该区域上覆堆积体和下覆板岩倾倒变形的历史演化过程:在冰水的携带作用下,边坡顶部的岩土体逐步向下迁移而形成堆积体,并且表现出明显的层状效应;板状岩体在构造运动、河谷下切和风化卸荷等共同作用下,加之上覆堆积体重量的不断增加,从而发生折断并导致倾倒变形。在对冰水堆积体物理力学特性分析的基础上,结合现场的工程地质调查,得到了区域内堆积体边坡的变形破坏模式表现为顺软弱面整体滑动破坏和局部圆弧型滑动。 相似文献
3.
Confined groundwater near the rockhead in igneous rocks in the Mid-Levels area, Hong Kong, China 总被引：1，自引：0，他引：1
It is customary in Hong Kong to assume that the hydraulic conductivity of weathered igneous rocks decreases with depth or as the rock mass becomes less weathered. Such a hydraulic conductivity pattern can only lead to an unconfined aquifer. This paper presents a case study in the regions in and around the Mid-Levels area in Hong Kong regarding a possible relatively high hydraulic conductivity (K) zone and confined groundwater along the rockhead. The Mid-Levels area is located at the lower part of the north-facing slopes of Victoria Peak on Hong Kong Island and is prone to landslides. Although this site has a long history of geotechnical studies because of extensive urban development along the coast and public concern on slope stability, hydrogeology of the site remains poorly understood. This paper reexamined the hydraulic conductivity data in 7 boreholes conducted in the 1970s and found that 4 of them indicate an increase in K at the rockhead. Groundwater conditions revealed by tunnel construction at the coast suggest that K close to the rockhead is about 10 times greater than above rockhead. A careful analysis of storm response of a piezometer group with tips in different depths indicates that there was an upward flow from the bedrock to the colluvium. A field study of two overflow standpipes conducted by the authors showed that the water level can be 0.64 and 3.73 m above the ground surface, which illustrates that the deep groundwater is significantly artesian. A search of the archived site investigation reports from the government and private companies has led to an identification of about 24 sites with overflow boreholes, which suggests that overflow phenomenon is quite common in the study area. The paper then concludes that in the study area there is a relatively high K zone along the rockhead and the groundwater in the zone is confined. It is recommended that geotechnical engineers should carry out a more careful field study on an overflow borehole because such a borehole indicates a confined groundwater condition important for slope stability study and foundation design. 相似文献
4.
Ahmed Abdulameer Jassim M. Thabit Firas H. AL-Menshed Broder Merkel 《Environmental Earth Sciences》2018,77(17):619
Electrical resistivity surveying for delineating seawater intrusion was performed in the Dibdibba aquifer in the area between the cities of Al-Zubair–Safwan and Al-Zubair–Umm Qasr in the vicinity of Khor AL-Zubair Channel, Basrah governorate, southern Iraq. Fourteen 2D resistivity profiles with a total length of 14 km were collected in the study area. The resistivity sections were compared with lithological data extracted from 11 boreholes. Thirty-nine groundwater samples were collected within the area and analyzed for chemical constituents; internal hydrogeological reports and unpublished studies were also evaluated. Results reveal the existence of three major resistivity layers, ranging from 0.1 to 130 Ωm at various depths and locations. The first layer has very low electrical resistivity (0.1–5 Ωm) representing a layer saturated with saltwater intruded from Khor AL-Zubair Channel. The second layer shows resistivity in the range of 5–130 Ωm, attributed to a transition zone and an unaffected zone saturated with brackish groundwater. The last resistivity layer (<?3 Ωm) represents coarse-grain sediments saturated with saline groundwater. Furthermore, a hard clay bed (Jojab) appears with a resistivity of 3–7 Ωm in all 2D imaging lines within a depth of 20–28 m. Electrical conductivity (EC) measurements from seven wells collected in 2014 and 2016 show a positive EC difference increasing landward with an average increase of 1927 µS/cm. In addition, six chemical relationships (Na/Cl, [Ca?+?Mg]/[HCO3?+?SO4], SO4/HCO3, SO4/Cl, Mg/Ca and Cl/[HCO3?+?CO3]) are used to detect the source of salinity in groundwater. This study proves that extensive use of high-resolution 2D imaging sections, alongside lithological and hydrogeological data, can serve as a useful tool to delineate the boundaries between aquifers, identify hydraulic boundaries between groundwater with different salinities and allocate hard clay layers between the upper and lower Dibdibba aquifer. In general, the combination of 2D imaging and hydrochemistry enables conceptualization of the hydrogeological situation in the subsurface and characterization of the salinity source, here seawater intrusion, in the study area. There have been no studies published so far on the characteristics of saltwater intrusion in the study area, and this study is considered to be important for monitoring and studying the intrusion and regression of seawater. 相似文献
5.
Monitoring of wastewater percolation in unsaturated sandy soil using geoelectrical measurements at Gabal el Asfar farm,northeast Cairo,Egypt 总被引：5，自引：5，他引：0
Khaled M. Said Gemail 《Environmental Earth Sciences》2012,66(3):749-761
The use of wastewater for irrigation in sandy soil increases the pollution risk of the soil and may infiltrate to the shallow
groundwater aquifer. In such environment, some important parameters need to be obtained for monitoring the wastewater in the
unsaturated zone over the aquifer. These parameters include clay content, heterogeneities of the upper soils, depth to the
aquifer and the variations of groundwater quality. In the present work, the efficiency of DC resistivity method in forms of
1-D and 2-D measurements was studied for wastewater monitoring in the Gabal el Asfar farm, northeast of Cairo, Egypt. Forty-one
Schlumberger soundings (VES) were performed then followed by three pole-dipole 2-D profiles along some considered regions
within the area. The resistivity measurements were integrated with the boreholes, hydrogeological and hydrochemical (surface
and groundwater samples) information to draw a clear picture for the subsurface conditions. The obtained results were presented
as cross sections and 3-D visualization to trace the clay intercalations within the unsaturated zone. In addition, a vulnerability
map was created using the obtained results from 1-D Schlumberger survey and confirmed with the 2-D resistivity profiling.
The obtained results have shown that the 2-D resistivity imaging technique is a powerful tool for mapping the small-scale
variability within the unsaturated zone and the wastewater infiltration. However, limitations of resistivity techniques were
observed in the area with limited resistivity contrast such as thin clay layers with brackish water background. Under that
condition, the measured pattern of resistivity distributions depends on the applied electrode array, electrode spacing and
using the available geological information during the inversion process. 相似文献
6.
Edouard Palis Thomas Lebourg Maurin Vidal Clara Levy Emmanuel Tric Mickael Hernandez 《Landslides》2017,14(4):1333-1343
The geology of the “Vence” landslide (0.8 million m3, south-eastern France) explains the complex hydrology of the site which plays a key role in the destabilization of the slope (water circulation within the sliding mass, fluid exchanges between superficial layers and deep karstic aquifer through faults). To understand fluid circulations within the unstable slope, a 9.5-year multi-parametric survey was set up. The survey combines electrical resistivity tomography (daily acquisition), rainfall records since 2006 and boreholes monitoring groundwater level since 2009. The objective of this work is to present an automated clustering analysis applied to the ERT data enabled to locate geological units displaying distinct hydrogeological behaviours. Clustering analysis, based on a hierarchical ascendant classification (HAC), helped to simplify the ERT section isolating three groups of apparent resistivity values. Comparing the variations of these clusters’ behaviours in time to the variations of the groundwater levels on site, we identified hydrogeological units. The role of the faults cutting the substratum is thereby highlighted. It is the simultaneous analysis of such a large real dataset that allowed obtaining robust results characteristic of the long-term behaviour of the natural hydrogeological system. This type of qualitative information on the variability of the slope hydrogeological behaviour both spatially and temporally is crucial to help improving the conversion of resistivity data into hydrologic quantities. Indeed, the definition of petrophysical models to convert ERT measurements into hydrological measurements should be site-specific and take into account the spatial and temporal variability of the medium. In this work, we show a method that can also help to focus on the areas in depth that have different levels of permeability and observe how the saturation degree evolves in time. This can be used to optimize the location of additional instrumentation (such as temperature probes and chemical sampling) and, thus, help in the prevention of the risk in such problematic areas. 相似文献
7.
鄂西岗地1：50 000水文地质图数据集是在董市幅实施水文地质测绘、地球物理勘探、遥感地质解译、水文地质钻探、水样品采集测试及地下水位监测与统测等工作基础上完成原始数据采集,综合前期收集资料的整理分析与最新采集数据集成编制而成。原始数据采集主要包括遥感地质解译面积450 km2,机（民）调查点226个,地质调查点125个,环境地质调查点16个,水文地质钻探孔12眼,工程地质钻探孔8眼,水样品（全分析、同位素及有机污染样）合计采集80组,丰、枯水期地下水位统测各40点次,以及机（民）井监测12点位（一个水文年监测）等,数据采集严格遵守《水文地质调查规范》（DZ/T 0282-2015）《水文水井地质钻探规程》（DZ/T 0148-2014）等规范与技术要求组织实施,保证数据的准确可靠。数据集采用MapGIS 6.7平台辅助制图,坐标系为1984年西安坐标系,投影方式为高斯-克吕格投影（6度带）。水文地质图编制是以地下水系统理论为指导,充分展现关键水文地质信息与地下水资源现状条件,为区域地下水资源开发利用远景规划与有效保护提供直接依据,能够促进长江中游生态文明建设与长江中游经济带快速发展。 相似文献
8.
Cheng-Chao Lee Li-Sheng Zeng Chin-Hsien Hsieh Chun-Yi Yu Sheng-Hsiung Hsieh 《Environmental Earth Sciences》2012,66(6):1641-1651
Electrical resistivity tomography (ERT), single-point-resistance logging with time-lapse, and geological and groundwater level
data, are utilized to determine the mechanism of, and a hydrogeological model of, the Gangxianlane landslide in the west-central
part of Taiwan. The rock surface and geometry of the colluviums were found by integrating ERT and borehole data. The iso-resistivity
line in the bedrock broadly followed the bedding plane, indicating that the contribution of lithology to resistivity exceeds
that of groundwater. The results of single-point-resistance logging with time-lapse and borehole data reveal that the bedrock
has low permeability, which is associated with poorly developed joints and fractures. The fine grain content part (including
the clayey layer), almost parallel to the bedding plane of the bedrock and between the colluvium and the bedrock in the upper
part of the landslide, served as the slip surface and is believed to have been recently produced. It can block and retain
water in the colluviums. Accordingly, this slip surface has the potential to re-slip in the future. Another slope failure
involved rock collapse by a well-developed open release joint close to the Huoshaoping Terrace. It is also related to groundwater
flow over a large gradient from the Huoshaoping Terrace. It is a key to determining whether this landslide will expand in
the future. 相似文献
9.
Groundwater investigation in Kuala Selangor using vertical electrical sounding (VES) surveys 总被引：2，自引：0，他引：2
Integrated geoelectrical and hydrochemical surveys were used to investigate and delineate different types of groundwater in
the Kuala Selangor alluvial aquifer. Previous hydrogeological borehole investigation showed that this aquifer contains several
types of groundwater in relation to its salinity. The high salinity of the groundwater in some areas is believed to be due
to either saltwater intrusion from the nearby sea or river infiltration during high tide season. The vertical electrical sounding
(VES) method was employed to study and map the subsurface variation of resistivity in the area. For each sounding measurement,
a total spread length of 300 m was obtained with a vertical depth penetration of about 60 to 75 m. Chemical analysis of the
groundwater samples taken from both shallow and deep boreholes was carried out for the water quality determination. A total
of 45 VES stations were succesfully established along three parallel roads with a direction almost perpendicular to the coastal
line. The distance between stations varies from 1 to 2 km with a maximum length of about 60 km surveyed line. Results of the
vertical electrical soundings as well as the hydrochemistry of the groundwater samples show that the soil and groundwater
in the study area can be grouped into fresh and brackish water zones. The subsurface resisitivity sections derived from the
VES study suggest that the area is dominated by brackish soil and groundwater zones, especially in the area towards the coast.
This result appears to agree well with the groundwater pumped from boreholes scattered around in the area. Water drawn from
boreholes near the coast showed higher salinity compared to the water pumped from inland boreholes. Chloride values greater
than 250 mg/L are considered to represent the brackish zones whilst values less than 250 mg/L represents zones of fresh soil
and groundwater. 相似文献
10.
Vertical electrical sounding was used for assessing the suitability of the drill sites in crystalline areas within a water supply project in Nampula Province in Mozambique. Many boreholes have insufficient yield (<600 L/h). Electrical resistivity tomography (ERT) was carried out over seven boreholes with sufficient yield, and five boreholes with insufficient yield, in Rapale District, in an attempt to understand the reason for the failed boreholes. Two significant hydrogeological units were identified: the altered zone (19–220 ohm-m) with disintegrated rock fragments characterized by intermediate porosity and permeability, and the fractured zone (>420 ohm-m) with low porosity and high permeability. In addition to this, there is unfractured nonpermeable intact rock with resistivity of thousands of ohm-m. The unsuccessful boreholes were drilled over a highly resistive zone corresponding to fresh crystalline rock and a narrow altered layer with lower resistivity. Successful boreholes were drilled in places where the upper layers with lower resistivity correspond to a well-developed altered layer or a well-fractured basement. There are a few exceptions with boreholes drilled in seemingly favourable locations but they were nevertheless unsuccessful boreholes for unknown reasons. Furthermore, there were boreholes drilled into very resistive zones that produced successful water wells, which may be due to narrow permeable fracture zones that are not resolved by ERT. Community involvement is proposed, in choosing between alternative borehole locations based on information acquired with a scientifically based approach, including conceptual geological models and ERT. This approach could probably lower the borehole failure rate. 相似文献
11.
Theis Raaschou Andersen Søren Erbs Poulsen Steen Christensen Flemming Jørgensen 《Hydrogeology Journal》2013,21(2):491-503
Groundwater models simulating flow in buried valleys interacting with regional aquifers are often based on hydrogeological models interpreted from dense geophysical datasets and scarce borehole data. For three simple synthetic cases, it is demonstrated that alternative methods of inversion of transient electro-magnetic (TEM) data can lead to very different interpretations of the hydrogeology inside and surrounding a buried valley. The alternative interpreted hydrogeological models are used in numerical modelling of groundwater flow to a pumping well. It is demonstrated that the alternative models result in quite different groundwater-model predictions of capture zone, recharge area, and groundwater age for the pumping well. It is briefly demonstrated that model calibration against hydraulic head data is not likely to improve the predictions or to identify the structural error of the interpreted hydrogeological models. It is therefore concluded that when TEM-based resistivity models are interpreted to construct the hydrogeological framework of a groundwater model, it must be done cautiously with support from deep borehole information. Too much reliance on geophysical mapping can lead to seriously wrong hydrogeological models and correspondingly wrong groundwater-model predictions. 相似文献
12.
Conceptual hydrogeological model of volcanic Easter Island (Chile) after chemical and isotopic surveys 总被引：2，自引：2，他引：0
Most human activities and hydrogeological information on small young volcanic islands are near the coastal area. There are almost no hydrological data from inland areas, where permanent springs and/or boreholes may be rare or nonexistent. A major concern is the excessive salinity of near-the-coast wells. Obtaining a conceptual hydrogeological model is crucial for groundwater resources development and management. Surveys of water seepages and rain for chemical and environmental isotope contents may provide information on the whole island groundwater flow conditions, in spite of remaining geological and hydrogeological uncertainties. New data from Easter Island (Isla de Pascua), in the Pacific Ocean, are considered. Whether Easter Island has a central low permeability volcanic “core” sustaining an elevated water table remains unknown. Average recharge is estimated at 300–400 mm/year, with a low salinity of 15–50 mg/L Cl. There is an apron of highly permeable volcanics that extends to the coast. The salinity of near-the-coast wells, >1,000 mg/L Cl, is marine in origin. This is the result of a thick mixing zone of island groundwater and encroached seawater, locally enhanced by upconings below pumping wells. This conceptual model explains what is observed, in the absence of inland boreholes and springs. 相似文献
13.
On August 27, 2014, a large-scale landslide occurred in Fuquan, Guizhou, China. This high-speed landslide caused considerable destruction; 23 people were killed, 22 were injured, and 77 houses were damaged. Field investigations, deformation monitoring, and numerical analyses have been performed to examine the characteristics and formation processes of this landslide. In the Xiaoba area, the slope showed a two-layered structure with a hard upper layer and a soft lower layer. Dolomite of the Dengying Formation in the slope front formed a locked segment controlling slope stability. Based on deformation and failure characteristics, the landslide is divided into sliding source area A and accumulation area B. The landslide is also divided into the following stages: bedding slip, tension cracking at the slope scarp, and the appearance of the locked section at the slope toe. Numerical calculations show that excavation led to maximum shear strain concentration along the interface of siltstone and slate in the middle of the slope, which became a potential sliding surface. Stress concentration and distribution of the plastic zone of the locked segment of the Dengying Formation dolomite occurred in the slope toe. Continuous rainfall caused the groundwater level to rise in the Xiaoba slope. The unfavorable geological structure was a determinant factor, and the combined effects of excavation and continuous rainfall were triggering factors that induced the landslide. The geomechanical mode for the Xiaoba landslide is sliding tension–shear failure. 相似文献
14.
Naves Acacia Samper Javier Pisani Bruno Mon Alba Dafonte Jorge Montenegro Luis García-Tomillo Aitor 《Hydrogeology Journal》2021,29(8):2655-2669
Groundwater availability, management and protection are great challenges for the sustainability of groundwater resources in the scattered rural areas of the Atlantic regions of Europe where groundwater is the only option for water supply. This report presents a hydrogeological study of the coastal granitic area of Oia in northwestern Spain, which has unique geomorphological and hydrogeological features with steep slopes favoring the erosion of the weathered granite. The hydrogeological conceptual model of the study area includes: (1) the regolith layer, which is present only in the flat summit of the mountains; (2) the slope debris and the colluvial deposits, which are present in the intermediate and lowest parts of the hillside; (3) the marine terrace; and (4) the underlying fractured granite. Groundwater recharge from rainfall infiltration varies spatially due to variations in terrain slope, geology and land use. The mean annual recharge estimated with a hydrological water balance model ranges from 75 mm in the steepest zone to 135 mm in the lowest flat areas. Groundwater flows mostly through the regolith and the detrital formations, which have the largest hydraulic conductivities. Groundwater discharges in seepage areas, springs, along the main creeks and into the sea. The conceptual hydrogeological model has been implemented in a groundwater flow model, which later has been used to select the best pumping scenario. Model results show that the future water needs for domestic and tourist water supply can be safely provided with eight pumping wells with a maximum pumping rate of 700 m3/day.
相似文献15.
Coastal aquifer assessment based on geological and geophysical survey,northwestern Crete,Greece 总被引：6，自引：3，他引：3
Pantelis M. Soupios Despina Kalisperi Asimina Kanta Maria Kouli Pavel Barsukov Filippos Vallianatos 《Environmental Earth Sciences》2010,61(1):63-77
Groundwater preservation comprises a major problem in water policy. The comprehension of the groundwater/hydraulic systems
can provide the means to approach this problem. Generally, drilling is expensive and time-consuming. On the other hand, new
techniques have been applied during the last few decades that provide useful information on the depth and quality of aquifers.
Among them, transient electromagnetic method (TEM) is an appealing method that provides fast results with minimum field crew
and solves several hydrogeological problems. Many portable systems for single-site measurements are commercially available.
The TEM-Fast 48HPC was used for acquiring 106 soundings in the northwestern Crete in Greece for defining the hydrogeological
characteristics of the study area, since there were no available data from boreholes. Detailed geological, hydrolithological
and tectonic survey was applied prior to the geophysical measurements. All the data were integrated to produce a secure and
reliable hydrogeological model for the study area prior to any future hydrowell. Specifically, geometrical and hydraulic data
of the study area groundwater were acquired. Two unconnected aquifers were detected and their possible contamination due to
saltwater intrusion was analyzed and eliminated. Moreover, a location for borehole construction and groundwater pumping based
on the potential of the aquifer system was proposed. Finally, the contribution of TEM (and electrical resistivity tomography)
geophysical methods in studying complex coastal aquifers is shown by this work. 相似文献
16.
This paper presents the combination of two complementary methods, magnetic and joint inversion of resistivity/TEM data, as
an effective approach to characterize groundwater reservoirs. Twenty stations of transient electromagnetic (TEM) and vertical
electrical soundings (VES) were measured and interpreted using a joint inversion technique to evaluate the subsurface low
resistivity zones connected to the groundwater reservoir. A complementary survey including 871 land magnetic stations was
carried out at the same area to detect the upper surface of the basaltic sheet, which represents the bottom of the Miocene
aquifer in the study area. The geological log from one borehole drilled in the zone was used to partially calibrate the calculated
models. The results revealed that the study area consists of five different geological units with ages ranging from Paleogene
(Oligocene) to Quaternary. The methodology provides good results at a very low cost when compared with drilling boreholes. 相似文献
17.
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
18.
针对河南省新乡市凤泉区严重缺水现状,利用高密度电阻率法、高密度电阻率法与激发极化对称四极测深组合在水文地质条件复杂的松散层和基岩干旱地区勘查地下水,结合水文地质资料和成井条件所定的井位,后经施工钻孔验证,定井成功率100%,解决了人、畜急需用水问题。通过以上两种方法结合或单一方法在该地区不同水文地质条件下的实际应用和应用效果分析,总结出针对该地区特定的水文地质条件选择高密度电阻率法、高密度电阻率法与激发极化法组合模式。密度电阻率法和激发极化法组合模式在该地区地下水勘查中的运用提高了地质解释的准确性和可靠性,值得在类似水文地质条件和地区推广应用。 相似文献
19.
本数据集为2017年在海南省龙门市幅开展的1：50 000环境地质调查的调查信息、水文地质钻孔、地下水采样及化学成分测试结果,包含机民井点221个,泉点21个,地表水点7个,水文地质钻孔10个,进尺808.77 m,地下水全分析采样点56个。调查点符合规范要求,钻探施工质量可靠,采样过程规范,测试均由符合资质要求的实验室完成,数据质量可靠。数据集可以真实反映该时段龙门市幅水文地质环境地质条件,并依托调查成果,为地方圈定1处地下水后备水源地,可有效缓解季节性缺水问题,为科学合理利用地下水资源提供依据。 相似文献
20.
长江中游城市群承东启西、连接南北,在我国经济均衡发展、和谐发展中占有重要地位,咸宁地区矿泉水资源的发现,将助力绿色经济发展。咸宁汀泗桥幅数据依托中国地质调查局"武汉都市圈京广高铁沿线汀泗桥幅地质环境综合调查"项目,在充分收集地质、遥感、物探及水文地质等资料基础上,开展汀泗桥幅1：50 000水文地质调查。本数据集包含钻孔基本信息（12个钻孔）、钻孔地层描述信息（12个钻孔）、机民井点调查结果（77个机民井）、泉点调查结果（46个泉点）、地下水动态监测信息（2处）、无机水样测试结果（61件）和有机水样测试结果（9件）,数据量约为4.77 MB。数据集充分反映了1：50 000水文地质调查中典型水文地质现象、灰岩地层的岩溶发育特点及岩溶地下水的水化学特征。通过水化学分析,在咸宁市汀泗桥镇白羊畈-赤壁官塘驿镇大贵畈-中伙铺镇一线发现富锶型饮用天然矿泉水,赤壁中伙铺琅桥一带为富锶、富锌复合型饮用天然矿泉水,对该区的矿泉水资源勘查具有重要参考意义。实施探采结合井,服务地方用水需求。 相似文献