Zhu L.,Capital Normal University |
Gong H.,Capital Normal University |
Dai Z.,Jilin University |
Dai Z.,Los Alamos National Laboratory |
And 2 more authors.
Hydrology and Earth System Sciences | Year: 2017
Alluvial fans are highly heterogeneous in hydraulic properties due to complex depositional processes, which make it difficult to characterize the spatial distribution of the hydraulic conductivity (K). An original methodology is developed to identify the spatial statistical parameters (mean, variance, correlation range) of the hydraulic conductivity in a three-dimensional (3-D) setting by using geological and geophysical data. More specifically, a large number of inexpensive vertical electric soundings are integrated with a facies model developed from borehole lithologic data to simulate the log10(K) continuous distributions in multiple-zone heterogeneous alluvial megafans. The Chaobai River alluvial fan in the Beijing Plain, China, is used as an example to test the proposed approach. Due to the non-stationary property of the K distribution in the alluvial fan, a multiple-zone parameterization approach is applied to analyze the conductivity statistical properties of different hydrofacies in the various zones. The composite variance in each zone is computed to describe the evolution of the conductivity along the flow direction. Consistently with the scales of the sedimentary transport energy, the results show that conductivity variances of fine sand, medium-coarse sand, and gravel decrease from the upper (zone 1) to the lower (zone 3) portion along the flow direction. In zone 1, sediments were moved by higher-energy flooding, which induces poor sorting and larger conductivity variances. The composite variance confirms this feature with statistically different facies from zone 1 to zone 3. The results of this study provide insights to improve our understanding on conductivity heterogeneity and a method for characterizing the spatial distribution of K in alluvial fans. © Author(s) 2017.
Huanhuan L.,Captial Norrmal University |
Youquan Z.,Captial Norrmal University |
Rong W.,Beijing Institute of Hydrogeology and Engineering Geology
3rd International Workshop on Earth Observation and Remote Sensing Applications, EORSA 2014 - Proceedings | Year: 2014
Beijing-Tianjin high-speed railway is China's first high-speed passenger rail lines. Its high-speed has strict requirements of rail deformation. The Beijing-Tianjin high-speed rail across the Chaoyang and Tongzhou where affect land subsidence. It mainly affects the track ride and security due to performance of the regional uneven settlement. The research has shown that: the large pumping of groundwater is the main reason of causing land subsidence along Beijing-Tianjin high-speed railway. At the same time, it is also affected by tectonic environment, sedimentary environments and secondary consolidation of the soil etc. Therefore, it need limiting the groundwater pumping near the Beijing-Tianjin high-speed railway. In addition, optimizing the groundwater extraction program and strengthen groundwater monitoring is also necessary. Groundwater recharge is need if there is severely land subsidence. © 2014 IEEE.
Qiang W.,China University of Mining and Technology |
Yuanzhang L.,China University of Mining and Technology |
Yuanzhang L.,Beijing Institute of Hydrogeology and Engineering Geology |
Liu Y.,Institute of Hydrogeology and Environmental Geology
Mine Water and the Environment | Year: 2011
Water inrush through a mine floor is a complicated nonlinear phenomenon, which is controlled by multiple factors. Different coal seams can have different vulnerabilities, even if they are in the same mine and the same district. To assess the differences in vulnerability between multiple coal seams, we used data from three coal seams of the Tashan Coal Mine. Analysing the results indicates that the vulnerable index method, which incorporates GIS, has many potential advantages in evaluating the likelihood of water inrushes compared to the water inrush coefficient method that has traditionally been used in China. © 2010 Springer-Verlag.
Qiao X.,Chinese Academy of Sciences |
Qiao X.,University of Chinese Academy of Sciences |
Li G.,CAS Institute of Geology and Geophysics |
Li Y.,China University of Petroleum - Beijing |
Liu K.,Beijing Institute of Hydrogeology and Engineering Geology
Environmental Earth Sciences | Year: 2015
Karstic limestone formation in Lancun spring area is one of the most important drinking water resources for Taiyuan City in Shanxi Province. The mapping of drinking water-protected areas is an effective way to protect drinking water sources. In this study, Lancun spring area in Taiyuan City was considered as a case study. Considering geological deposition and hydrogeological characteristics of this area, the stochastic idea was introduced to structural model establishment to determine the heterogeneity of karst groundwater system and clarify medium parameters. To analyze the influence of heterogeneity on groundwater flow simulation and wellhead-protected area delineation, homogeneous and stochastic hydrogeological parameter models were established and coupled with groundwater flow simulation models. Particle tracer analysis could be performed to determine capture zone. Results showed that stochastic methods could be used to generate a series of possible flow head field distributions and delineate a series of capture zones compared with homogeneous methods; thus, probability distribution was observed instead of a deterministic area. This result could provide a more scientific basis for the design and assessment of protective measures for wellhead areas in karst groundwater systems. © 2015, Springer-Verlag Berlin Heidelberg.
Chen B.-B.,Capital Normal University |
Gong H.-L.,Capital Normal University |
Li X.-J.,Capital Normal University |
Lei K.-C.,Capital Normal University |
And 3 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2013
The excessive mining for underground water is the main reason inducing the land subsidence in Beijing, while, increasing of load brought by the urban construction aggravate the local land subsidence in a certain degree. As an international metropolis, the problems of land subsidence that caused by urban construction are becoming increasingly highlights, so revealing the relationship between regional load increase and the response of land subsidence also becomes one of the key problems in the land subsidence research field. In order to analyze the relationship between the load changes in construction and the land subsidence quantitatively, the present study selected the TM remote sensing image covering Beijing plain and used Erdas Modeler tool to invert the index based on building site (IBI), acquired the spatial and temporal change information in research area further; Based on results monitored by PS-InSAR (permanent scatterer interferometry) and IBI index method, and combined with the GIS spatial analysis method in the view of pixels in different scales, this paper analyzes the correlation between typical area load change and land subsidence, The conclusions show that there is a positive correlation between the density of load and the homogeneity of subsidence, especially in area which has a high sedimentation rate. Owing to such characteristics as the complexity and hysteretic nature of soil and geological structure, it is not obvious that the land subsidence caused by the increase of load in a short period. But with the increasing of local land load made by high density buildings and additional settlement of each monomer building superposed with each other, regional land subsidence is still a question that cannot be ignored and needs long-term systematic research and discussion.
Wu Q.,China University of Mining and Technology |
Liu Y.,China University of Mining and Technology |
Liu Y.,Beijing Institute of Hydrogeology and Engineering Geology |
Liu D.,China University of Mining and Technology |
And 2 more authors.
Rock Mechanics and Rock Engineering | Year: 2011
Floor water inrush represents a geohazard that can pose significant threat to safe operations for instance in coal mines in China and elsewhere. Its occurrence is controlled by many factors, and the processes are often not amenable to mathematical expressions. To evaluate the water inrush risk, the paper proposes the vulnerability index approach by coupling the analytic hierarchy process (AHP) and geographic information system (GIS). The detailed procedures of using this innovative approach are shown in a case study in China (Donghuantuo Coal Mine). The powerful spatial data analysis functions of GIS was used to establish the thematic layer of each of the six factors that control the water inrush, and the contribution weights of each factor was determined with the AHP method. The established AHP evaluation model was used to determine the threshold value for each risk level with a histogram of the water inrush vulnerability index. As a result, the mine area was divided into five regions with different vulnerability levels which served as general guidelines for the mine operations. The prediction results were further corroborated with the actual mining data, and the evaluation result is satisfactory. © Springer-Verlag 2011.
Chen B.,Capital Normal University |
Gong H.,Capital Normal University |
Li X.,Capital Normal University |
Lei K.,Capital Normal University |
And 3 more authors.
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | Year: 2013
Increasing of load brought by the urban construction aggravate the local land subsidence. As an international metropolis, land subsidence that caused by urban construction are becoming highlight increasingly in Beijing, China, so revealing the relationship between regional load increase and land subsidence also becomes a key problem. TM remote sensing image covering Beijing plain were selected and Erdas Modeler tool was used to calculate the index basing on building site (IBI), acquiring spatial and temporal change information of build-up area. Basing on deformation information monitored by PS-InSAR (permanent scatterer interferometry) technology and IBI index, combining with GIS spatial analysis method in the three different sampling ranges, the correlation between InSAR annual subsidence rate and IBI index was analyzed. The conclusions show that there is positive correlation between load density and uneven settlement, the higher settlement rate, the higher spearman rank correlation coefficient. Compared to the static load, the impact of combined dynamic and static load to land subsidence is more obvious. It is not obvious for the influence to land subsidence caused by the increase of load in a short period.
Yang Y.,Beijing Hydraulic Research Institute |
Zheng F.-D.,Beijing Hydraulic Research Institute |
Liu L.-C.,Beijing Hydraulic Research Institute |
Dou Y.-B.,Beijing Hydraulic Center |
Jia S.-M.,Beijing Institute of Hydrogeology and Engineering Geology
Geology in China | Year: 2013
Excessive artificial extraction of groundwater has caused the continuous decline of groundwater levels and, as a result, triggered a large area of land subsidence. To avoid a wider range of land subsidence, the authors used the clay layer thickness, the drawdown rate of groundwater level and groundwater exploitation as three impact factors to carry out studies. In accordance with their respective extent of impact, the impact factor weights were determined, the overlay method in GIS was used to divide land subsidence into susceptibility zoning. In combination with water resource allocation of South-to-North water transfer, this paper has proposed the control measures on land subsidence, thus providing a scientific basis for layout optimization of groundwater exploitation and land subsidence.
Characterization of land subsidence induced by groundwater withdrawals in the plain of Beijing city, China [Caractérisation de la subsidence induite par les prélèvements deaux souterraines dans la plaine de Pékin, Chine]
Zhang Y.,Capital Normal University |
Gong H.,Capital Normal University |
Gu Z.,Capital Normal University |
Wang R.,Beijing Institute of Hydrogeology and Engineering Geology |
And 2 more authors.
Hydrogeology Journal | Year: 2014
The plain of Beijing city in China suffers severe land subsidence owing to groundwater overdraft. The maximum subsidence rate could reach 6 cm/year through the 2000s. An integrated subsidence-monitoring program was designed, including levelling survey, borehole extensometers and multilayer monitoring of groundwater level, with the aim to understand both hydrological and mechanical processes and to characterize the land subsidence. From multilayer compaction monitoring, the major compression layers were identified. The major strata contributing to compression deformation are the second (64.5-82.3 m) and third (102-117 m) aquitards, which contributed around 39 % of the total subsidence. Meanwhile, irrecoverable deformations were also observed in the second (82.3-102 m) and third (117-148 m) confined aquifers; they exhibit elasto-plastic mechanical behavior, which is attributed to the thin beds of silt or silty clay. Stress-strain analysis and oedometer tests were conducted to study the aquifer-system response to pumping and to estimate the specific storage of the major hydrogeologic units. The results reveal the creep behavior and elasto-plastic, visco-elasto-plastic mechanical behavior of the aquitards at different depths. The compressibility of the aquitards in the inelastic range is about one order of magnitude larger than for the elastic range. © 2013 Springer-Verlag Berlin Heidelberg.
Lu H.-Y.,Beijing Institute of Hydrogeology and Engineering Geology |
Xin B.-D.,Beijing Institute of Hydrogeology and Engineering Geology |
Sun Y.,Beijing Institute of Hydrogeology and Engineering Geology
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2013
The organic pollution of the groundwater is increasingly deteriorating. The south-east suburb of Beijing is selected as the study area. To determine the pollution pathway and trend, groundwater dynamic monitoring, investigation of pollution sources and the analysis of the characteristics of organic pollution of groundwater were carried out. The data of groundwater dynamic monitoring show that the main contaminant compounds are the chlorinated hydrocarbon (1, 2-DCA, CF, 12-DCP) and monocyclic aromatics hydrocarbon (benzene, toluene, ethylbenzene, xylene), among which 1, 2-DCA and benzene are the top two most serious contaminants. The organic contamination is characterized by punctate distribution and limited scope. Aimed to identify the source of the organic contamination in the groundwater, the surface water, soil and air have all been sampled for investigation. It is found that the source of monocyclic aromatic hydrocarbon contamination is chemical industry, while the source of chlorinated hydrocarbon contamination is surface water infiltration and reclaimed water irrigation. Combined analysis of concentration change regularity of 1, 2-DCA and benzene, hydrogeological condition, pollution sources and the characteristics of organic contaminations in shallow groundwater, demonstrates that the type of the pathway of chlorinated hydrocarbon and monocyclic aromatics hydrocarbon in the shallow groundwater are continuous-intermittent infiltration and intermittent infiltration respectively. The study facilitates the future theory and practice of protection and control of organic pollution.