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Comparison between Neuman(1975) and Jacob(1946) application for analysing pumping test data of unconfined aquifer 被引量:3
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作者 Dana Mawlood Jwan Mustafa 《Journal of Groundwater Science and Engineering》 2016年第3期165-173,共9页
Pumping test of a water table aquifer is carried out to estimate the aquifer parameters, the obtained data were analysed through the solution of both Neuman(1975) and Jacob(1946) methods through AQTESOLV and Spreadshe... Pumping test of a water table aquifer is carried out to estimate the aquifer parameters, the obtained data were analysed through the solution of both Neuman(1975) and Jacob(1946) methods through AQTESOLV and Spreadsheet programs, the results of each methods are compared to evaluate the applicability and accuracy of the solution theoretically and practically. In the paper an example is presented, which is conducted for a constant rate pumping test from Ohio, in Fairborn(near Dayton), and it supplied by S.E. Norris(U.S. Geological Survey, Columbus, Ohio). The main objective of this study is to introduce both program and the way of the applications, and compare the results and the hand on of both programs in the field. 展开更多
关键词 Neuman(1975) Unconfined aquifer pumping test AQTESOLV program Microsoft Excel(Spreadsheet) program
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Groundwater Potentials Estimation of a Basement Terrain Using Pumping Test Data for Parts of Sanga Local Government Area, Kaduna State, Northwestern Nigeria
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作者 Hamidu Hassan Sidi Muhammad Waru +1 位作者 Garga Ali Bukar Kana Muhammad Abdullahi 《Open Journal of Modern Hydrology》 2016年第4期222-229,共8页
Aquifers derived from the crystalline basement rocks for parts of Sanga Local Government area of Kaduna State, Nigeria consist of clay, silt, sand, gravel and laterite materials which may be in various proportions. Us... Aquifers derived from the crystalline basement rocks for parts of Sanga Local Government area of Kaduna State, Nigeria consist of clay, silt, sand, gravel and laterite materials which may be in various proportions. Using Cooper-Jacobs non-equilibrium graphical method, the hydraulic properties were estimated from pumping test data of 18 boreholes. Conductivity varies from 1.02 × 10<sup>﹣2</sup> m/s to 4.07 × 10<sup>﹣2</sup> m/s and transmissivity varies from 1.14 × 10<sup>﹣1</sup> m<sup>2</sup>/s to 4.40 × 10<sup>﹣1</sup> m<sup>2</sup>/s. The values of specific capacity range between 1.03 × 10<sup>﹣1</sup> m<sup>2</sup>/s/m and 9.00 × 10<sup>﹣2</sup> m<sup>2</sup>/s/m, and these values indicate that the aquifers in the area have low to moderate ground water potentials. The low yield range of between 0.45 l/s and 1.00 l/s recorded in the area shows the heterogeneous and anisotropy nature of the basement aquifer system in terms of groundwater discharge. On the average, the boreholes assessed have potentials to sustain local to regional supply provided the best drilling method and materials are used and well completion properly done. 展开更多
关键词 pumping test Heterogeneous ANISOTROPY Conductivity Discharge Sanga
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Estimation of hydraulic parameters from pumping tests in a multiaquifer system 被引量:2
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作者 Da Ha Gang Zheng +2 位作者 Haizuo Zhou Chaofeng Zeng Huihui Zhang 《Underground Space》 SCIE EI 2020年第3期210-222,共13页
The hydrogeologic conditions in Tianjin,China,are characterized by a system of multiple alternating aquifers and aquitards and a high groundwater level.Generally,the groundwater system to a depth of 70 m includes one ... The hydrogeologic conditions in Tianjin,China,are characterized by a system of multiple alternating aquifers and aquitards and a high groundwater level.Generally,the groundwater system to a depth of 70 m includes one phreatic aquifer and three semiconfined aquifers(AqI–AqIII).The distribution of aquifers varies greatly.Accurate estimates of aquifer parameters from pumping tests are essential in geotechnical engineering practice.In this study,the applicability of different models for estimating hydraulic parameters in a multiaquifer system is analyzed.To avoid errors in the graphic-analytical process and to enhance the efficiency and accuracy,a hybrid algorithm,called GALMA(a genetic algorithm(GA)combined with the Levenberg–Marquardt(LM)algorithm),is used with the Neuman and Witherspoon model and ratio method.The estimated values in the second and third semiconfined aquifers(AqII and AqIII)from various solutions are compared with the measured data.Further validations based on the prediction of the drawdown values are performed via a three dimensional numerical simulation. 展开更多
关键词 Hydraulic parameter Leaky aquifer pumping test Optimal approach
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EXPERIMENTAL STUDY OF AIRFLOW INDUCED BY PUMPING TESTS IN UNCONFINED AQUIFER WITH LOW-PERMEABILITY CAP 被引量:1
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作者 HUANG Hui QIAN Jia-zhong +2 位作者 KUANG Xing-xing CHEN Zhou LI Ru-zhong 《Journal of Hydrodynamics》 SCIE EI CSCD 2012年第4期605-608,共4页
The airflow in unsaturated soils is an issue of great importance in various fields such as in agricultural, nuclear, environmental engineering. However, up to now, little attention was paid to the generation of the ai... The airflow in unsaturated soils is an issue of great importance in various fields such as in agricultural, nuclear, environmental engineering. However, up to now, little attention was paid to the generation of the airflow induced by a pumping test in an unconfined aquifer with a low-permeability cap and its influence on the pumping test. In this paper, pumping tests were carried out experimentally in the aquifer with a low-permeability cap in order to study the influence of the airflow induced by the pumping on the drawdown of the tests. It is shown that: (1) there is an airflow with negative pressure generated by the pumping tests, (2) the Negative air Pressure (NP) is increased with the pumping rate but decreased with the radial distance, and (3) the NP also changes with the initial water table. The results provide a good basis for further theoretical study of the airflow induced by pumping. 展开更多
关键词 low-permeability cap pumping tests AIRFLOW unconfined aquifer DRAWDOWN
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On-site tests to estimate aquifer permeability of drainage area of south caisson anchorage construction of Taizhou Bridge
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作者 Feng Zhaoxiang Zhao Yanrong 《Engineering Sciences》 EI 2011年第2期20-25,共6页
During the construction of the south caisson anchorage of Taizhou Bridge, the drainage area is located in the lower reaches of the Yangtze River and the permeability of stratums there is considerable. In order to main... During the construction of the south caisson anchorage of Taizhou Bridge, the drainage area is located in the lower reaches of the Yangtze River and the permeability of stratums there is considerable. In order to maintain progress and guarantee safety during the sinking of the caisson, water should be drained in the initial period. Subsequently, detailed information about the aquifer permeability is required to make sure that the drainage will proceed successfully, which consequently necessitates the on-site estimation of the aquifer permeability in the drainage area. Therefore, the traditional pumping test and slug test are implemented respectively on site. The comparison of computational results of these two tests indicates that they are consistent overall. Notwithstanding, as slug test can be conducted with portable facilities in a short time and the manipulation is easy and few people need to be involved, the advantages of slug test is conspicuous compared with the traditional pumping test. It could be speculated that slug test will gain a prevalent application in the measurement of aquifer permeability in the future. 展开更多
关键词 Taizhou Bridge south-anchor caisson pumping test slug test
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Development of a Test Apparatus for Measurement of Hydraulic Fluid Efficiency
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作者 Matt Jackson Brian Koehler 《润滑油》 CAS 2011年第5期28-33,共6页
With increasing demand for nonrenewable resources,energy conservation is critical.Efficiency gains allow more work to be performed while maintaining or even decreasing the energy expended in the process.Reducing the e... With increasing demand for nonrenewable resources,energy conservation is critical.Efficiency gains allow more work to be performed while maintaining or even decreasing the energy expended in the process.Reducing the energy consumed by a system results in favorable economic and environmental impact.An apparatus has been developed to measure hydraulic fluid efficiency in a stationary application.The system can be used to develop more efficient fluids,leading to increased work output or decreased energy consumption. 展开更多
关键词 mechanical and volumetric efficiency test pump test procedure
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Numerical evaluation of the ground response induced by dewatering in a multi-aquifer system 被引量:5
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作者 Yong-Xia Wu Qian Zheng +1 位作者 Annan Zhou Shui-Long Shen 《Geoscience Frontiers》 SCIE CAS CSCD 2021年第5期384-396,共13页
This study presents a numerical investigation of dewatering-induced settlement and wall deflection during pumping tests in Tianjin,China.Based on the measured groundwater head and building settlement during the pumpin... This study presents a numerical investigation of dewatering-induced settlement and wall deflection during pumping tests in Tianjin,China.Based on the measured groundwater head and building settlement during the pumping test,a three-dimensional liquid-solid coupling model is established by using the finite element method(FEM).The void ratio,hydraulic conductivity,and elastic modulus of each layer are back-calculated through the numerical model.The groundwater drawdown,seepage field,ground settlement,horizontal ground displacement,and diaphragm wall lateral deflection are analyzed using the FEM model.The simulated results demonstrate that(i)the maximum ground settlement outside of the excavation reaches to 82 mm due to the leakage effect of aquitards;(ii)large horizontal displacement occurs in the soil during the pumping test with a maximum value of 28.3 mm,and the installation of the diaphragm wall in the aquifer can reduce the horizontal displacement of the ground;(iii)long-term pumping causes a large lateral deflection of the diaphragm wall,and a maximum value of 23.2 mm occurs at the layer where the screens of the wells are located;and(iv)long-term large-scale pumping should be avoided before excavation. 展开更多
关键词 Excavation pit pumping test SETTLEMENT Wall deflection Numerical simulation
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Influence of correlation scale errors on aquifer hydraulic conductivity inversion precision 被引量:1
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作者 Yun-xiao Mu Lei Zhu +2 位作者 Tong-qing Shen Meng Zhang Yuan-yuan Zha 《Water Science and Engineering》 EI CAS CSCD 2020年第3期243-252,共10页
In order to investigate the influence of correlation scale error on the inversion precision of the hydraulic conductivity of the aquifer,the successive linear estimator(SLE)was used to invert the hydraulic conductivit... In order to investigate the influence of correlation scale error on the inversion precision of the hydraulic conductivity of the aquifer,the successive linear estimator(SLE)was used to invert the hydraulic conductivity field of a heterogeneous aquifer based on synthetic experiments.By increasing the numbers of observation wells and pumping tests,we analyzed the difference between the estimated and true values of hydraulic conductivity with different correlation scale errors.The relationships between the observation well number and the error in inversion results,and between the pumping test number and the error in inversion results were investigated.The results show that,if the amount of observed head data is insufficient,there will be errors in inversion results with changing correlation scale.Due to the existence of correlation scale error,the improvement of inversion precision gradually slows down with the increase of the amount of observed head data,which indicates that too much observed head data causes data redundancy.Therefore,for the synthetic experiments described in this paper,the observation well number should be less than 41,the pumping test number should be less than 17,and a more suitable method should be selected according to the precision requirements of specific situations in practical engineering. 展开更多
关键词 Hydraulic conductivity Parameter inversion Successive linear estimator Correlation scale error Observation well number pumping test number
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Experimental Study on Calculation of Hydro-Geological Parameters for Unsteady Flow 被引量:1
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作者 熊春宝 陈雯 叶作安 《Transactions of Tianjin University》 EI CAS 2013年第5期351-355,共5页
After the linear analytical method of unsteady flow theory is further improved,an innovative and faster algorithm is introduced.The water storage in a confined aquifer is derived from the water transmissivity coeffici... After the linear analytical method of unsteady flow theory is further improved,an innovative and faster algorithm is introduced.The water storage in a confined aquifer is derived from the water transmissivity coefficient and the water-pressure conductivity coefficient.The water transmissivity coefficient is approximated by a Taylorseries expansion of drawdown,and the water-pressure conductivity coefficient is obtained by the average drawdown.In this algorithm,the distance of the observation points from the pumping well must be short.When the distance is as short as the radius of the main pumping well,the data of the drawdown difference between the sidewall and the center of pumping well are difficult to measure,but the same results can be achieved based on the assumption that the drawdown difference approximates to the drawdown of the observation wells at a radial distance from the pumping well according to the algorithm.Without the help of charts,this algorithm is more concise and efficient,which has been verified by the test of water pumping project in Tianjin Binhai International Airport. 展开更多
关键词 pumping test unsteady flow theory improved linear analytical method hydro-geological parameter
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Advantages of employing multilevel monitoring wells for design of tunnels subjected to multi-aquifer alluvial
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作者 Mohsen GOLIAN Ebrahim SHARIFI TESHNIZI +6 位作者 Hamed TAVASOLI ROSTAMI Homayoon KATIBEH Mario PARISE Masoud MAHDAD Habib SAADAT Mehdi ABBASI Mahshid EBAD ARDESTANI 《Journal of Mountain Science》 SCIE CSCD 2021年第1期219-232,共14页
For tunnels being excavated through multiple knowledge of the aquifers’hydraulic head becomes essential for determining groundwater inflow into the tunnel and analyzing its stability,specifically using multilevel mon... For tunnels being excavated through multiple knowledge of the aquifers’hydraulic head becomes essential for determining groundwater inflow into the tunnel and analyzing its stability,specifically using multilevel monitoring systems.In the multi-aquifer alluvial section of the Glas tunnel(Iran),since the hydraulic head calculations were based on the data obtained from single-piezometer boreholes,the excavation risk was assessed to be at high level and the tunnel seemed to be unstable,thus an incorrect conclusion was derived from the misleading data.To take cost mitigation measures into account,it was necessary to calculate the hydraulic head at tunnel level accurately.By installing nested and clustered wells the mean hydraulic head was measured to be 70 m,significantly different from the 90 m previously determined by boreholes.Considering the updated value,the groundwater inflow and bulkhead load,formerly calculated as 0.65 m^(3)/s and 9.5 bars,were determined to be 0.49 m^(3)/s and 7.5 bars,respectively. 展开更多
关键词 Nested wells Clustered wells Hydraulic head pumping test Mechanized tunneling Iran
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Assessment of Hydraulic Parameters and Protection Zones of Catchment Aquifers for Water Supply Network in NdéDivision, West-Cameroon (Central Africa)
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作者 Roger Feumba Kemgang Dongmo Tchouta +3 位作者 Jean Ghislain Tabué Youmbi Valentin Yvan Emmanuel Mvondo Depesquidoux I. Tchaptchet Tchato Benjamin Ngounou Ngatcha 《Journal of Water Resource and Protection》 2021年第7期478-497,共20页
Ndé Division in West-Cameroon is facing with water supply although many attempts of restoring existing SCANWATER facilities by Bangangté Municipality. In order to address the issue, we assess the exploitable... Ndé Division in West-Cameroon is facing with water supply although many attempts of restoring existing SCANWATER facilities by Bangangté Municipality. In order to address the issue, we assess the exploitable pumping flow rate of catchment aquifers and its hydraulic properties by using Jacob and Theis method, and define protection zones with Hoffman and Lillich method. It emerges that the hydraulic conductivity of aquifer is in the order of 10<sup>-4</sup> m/sec, transmissivity varies from 10<sup>-4</sup> to 10<sup>-6</sup> m<sup>2</sup>/sec. Aquifer pumping flow rate (Q) varies between 1.5 and 10.5 m<sup>3</sup>/h. In volcanic rocks, aquifer is more productive (4.5 ≤ Q ≤ 10.5 m<sup>3</sup>/h). Transfer time of pollutants to aquifer varies from 3 to 56 days depending on rock-types and groundwater slope (0.03 - 0.13 m/m). Furthermore, 113,624 m and 1123 m are radius to be implemented for a better protection of groundwater against any form of pollutant. 展开更多
关键词 pumping tests Aquifer Properties Groundwater Protection Ndé Division West-Cameroon (Central Africa)
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Identification of Aquifer Properties in the Eastern Part of Kushtia District, Bangladesh
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作者 Md. Shahinuzzaman M. Nozibul Haque +1 位作者 Khan M. Nasir Uddin M. Alibuddin 《Journal of Geoscience and Environment Protection》 2020年第11期222-237,共16页
The present study has been undertaken to depict spatial distribution of different aquifer parameters in the eastern part of Kushtia district through a detailed hydrogeological survey. For this investigation, 119 litho... The present study has been undertaken to depict spatial distribution of different aquifer parameters in the eastern part of Kushtia district through a detailed hydrogeological survey. For this investigation, 119 lithologs and 92 pumping test data have been used. These data have been processed, analyzed, interpreted and krigged for the spatial assessment of the aquifer properties viz. transmissivity, hydraulic conductivity, hydraulic diffusivity, specific yield, radius of influence, and specific drawdown. It is seen from the investigation that the transmissivity and hydraulic conductivity values obtained from the pumping tests of the wells are varying from 1811 m<sup>2</sup>/day to 2568 m<sup>2</sup>/day and 32.5 m/day and 61.5 m/day respectively, the hydraulic diffusivity being ranging from 181,143 m<sup>2</sup>/day to 256,788 m<sup>2</sup>/day. The estimated specific yield of 17.97% - 23.46% supports that the area is dominated with coarse grained sands. This study reveals that the distribution of deep tube wells in the area are not within the radius of influence (638 - 760 m) each other, but few shallow and hand tube wells existed within the radius of influence. The estimated specific draw down is varying from 57 m/cumec to 126.1 m/cumec. From the overall analysis, it is found that the area is favorable for groundwater exploration. 展开更多
关键词 Groundwater AQUIFER pumping test TRANSMISSIVITY Hydraulic Conductivity Hydraulic Diffusivity Specific Yield Radius of Influence Specific Yield
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Impact of Grouting and Loading of Building Construction on the Water Level of Tangshan Mine Well
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作者 Sheng Yanrui Zhang Ziguang +3 位作者 Zhang Suxin Sun Dongxia Shan Lianjun Yin Baojun 《Earthquake Research in China》 2014年第2期242-249,共8页
The water level rising rate of Tangshan mine well significantly accelerated in 2010,and the ascensional range was obviously higher than that of the same period in previous years.From the view of groundwater dynamics a... The water level rising rate of Tangshan mine well significantly accelerated in 2010,and the ascensional range was obviously higher than that of the same period in previous years.From the view of groundwater dynamics and loading effects,and based on the water pumping( pouring) water test model and semi-infinite elastic space theory model under uniform load,the effects of grouting and loading of nearby building construction on the well water level were analyzed. Results show that grouting at a distance of 200 ~ 700 m to the well,with amount of 2500m3 per day and duration of 270 d,can cause an 8 ~ 11 m rise of well water level; and loading of large-area building construction can cause about a 4m rise of well water level. Through the analysis of these factors,we find that the water level anomalous rising of Tangshan mine well was relevant to grouting and loading of the nearby building construction. This study provides a scientific basis for anomalous rising analysis of water level of Tangshan mine well. 展开更多
关键词 Tangshan mine well Water level rise Uniform load theory model pumping test model
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Interpretation of Groundwater Flow into Fractured Aquifer
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作者 Sameh W.Al-Muqdadi Broder J.Merkel 《International Journal of Geosciences》 2012年第2期357-364,共8页
The region of investigation is part of the western desert of Iraq covering an area of about 12,400 km2, this region includes several large wadis discharging to the Euphrates River. Since the Tectonic features in parti... The region of investigation is part of the western desert of Iraq covering an area of about 12,400 km2, this region includes several large wadis discharging to the Euphrates River. Since the Tectonic features in particular fault zones play a significant role with respect to groundwater flow in hard rock terrains. The present research is focus on investigate lineaments that have been classified as suspected faults by means of remote sensing techniques and digital terrain evaluation in combination with interpolating groundwater heads and MLU pumping tests model in a fractured rock aquifer, Lineaments extraction approach is illustrated a fare matching with suspected faults, moreover these lineaments conducted an elevated permeability zone. 展开更多
关键词 Fault Interpretation Lineaments Extraction Remote Sensing Digital Terrain Model Analytical pumping test Evaluation
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The influence of low-permeability cap on capillary pressure during pumping in unconfined aquifer
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作者 黄辉 钱家忠 +3 位作者 匡星星 陈冰宇 马雷 吴亚楠 《Journal of Hydrodynamics》 SCIE EI CSCD 2013年第6期867-870,共4页
The pumping test in an unconfined aquifer with and without a low-permeability soil was studied experimentally to reveal the influence of the negative air pressure (NP) caused by the upper layer on the water content ... The pumping test in an unconfined aquifer with and without a low-permeability soil was studied experimentally to reveal the influence of the negative air pressure (NP) caused by the upper layer on the water content (w), the water pressure (Pw), as well as on the capillary pressure (Pc). The study demonstrates that the NP generated in the vadose zone during pumping in the capper aquifer has a significant influence on w, Pw and Pc The Pc obtained from the capped aquifer is smaller than that without the upper layer. After the NP reaches a peak, the influence of the NP on Pc. is gradually declined as the air inflows through the upper layer which makes the NP gradually return to zero. When the air pressure returns to the atmospheric pressure, Pc in the vadose zone is only correlated with Pw, the same as the case with no upper layer. 展开更多
关键词 low-permeability soil water content water pressure capillary pressure vadose zone pumping test
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Pumping speed of cryopump for xenon 被引量:1
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作者 LING Gui-long WEI Li-jun CAI Guo-biao 《航空动力学报》 EI CAS CSCD 北大核心 2015年第7期1731-1736,共6页
The xenon pumping speed testing system of the large-diameter external cryopump was designed to meet the plume test requirements for prototype electric propulsion.The flowmeter method was utilized to measure the xenon ... The xenon pumping speed testing system of the large-diameter external cryopump was designed to meet the plume test requirements for prototype electric propulsion.The flowmeter method was utilized to measure the xenon pumping speed.The test results show that the averaged effective pumping speed of doublecryopumps is 52 200L/s,and that of single-cryopump is 27 100L/s.The pumping speed ratio of two configurations is 1.93.It can be concluded that the pumping speed has in linear relationship with the number of cryopump,and the coefficient is irrelevant with the gas type.The averaged effective pumping speed of xenon is less than its nominal pumping speed,and the averaged pumping efficiency is 0.83.Under the identical inflow conditions,the averaged effective pumping speed ratio of nitrogen is 0.53,slightly less than the theoretical pumping speed ratio of 0.55.Consequently,it can be concluded that results assessment of large-diameter external cryopump design index can guide the engineering application,showing certain reference significance. 展开更多
关键词 VACUUM PLUME large-diameter external cryopump XENON pumping speed test
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