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Yu C.,Beijing Normal University | Yu C.,Inner Mongolia Institute of Environmental Science | Liu J.,Hydrogeology and Engineering Geology Team of Beijing | Liu J.,CAS Institute of Geology and Geophysics | And 3 more authors.
Advanced Materials Research | Year: 2012

The paper sets the definition of ecological water table in reclaimed water irrigation area, on which reclaimed water would not make the pollutants infiltrate into groundwater and not deteriorate groundwater environment. Case study from a soil profile in Daxing, Beijing shows that the ecological water table is changing due to the pollutants down movement in the unsaturated zone. Results show that the critical ecological groundwater depth is about 19.45 m in 2050 while the current is 8.25 m. The current water table depth of 18 m is within the ecological groundwater depth. The time lag between the human activities and water quality due to the relatively thick unsaturated zone should be paid attention to for sustainable water quality management. © (2012) Trans Tech Publications, Switzerland.


Guo G.-X.,University of Chinese Academy of Sciences | Ju Y.-W.,University of Chinese Academy of Sciences | Zhai H.,China Ordnance Industry Survey and Geotechnical Institute | Xu L.,Hydrogeology and Engineering Geology Team of Beijing | And 2 more authors.
Huanjing Kexue/Environmental Science | Year: 2014

In order to evaluate the groundwater quality of Tongzhou area in Beijing Plain and to discuss the characteristics of its distribution by the view of hydrochemistry, a total of 151 groundwater samples, collected within study area in the dry period of 2008 according to the geological and hydrogeololgical condition of Tongzhou area, were classified as shallow, middle and deep groundwater, respectively. Based on the data, the groundwater quality was evaluated by the method of F value. The mean and variance of main chemical constituents of groundwater samples were presented. Almost all the quaternary groundwater of Chaobai river pluvial fan belonged to the alkaline water type. The evaluation results based on the analysis results showed that from shallow to deep, the quality of groundwater in Beijing became better. The total areas of groundwater belonging to class IV and V area were 884 km2, 599 km2and 94 km2 respectively for shallow, middle and deep groundwater. The evaluation results showed that the main exceeding chemical constituents were TDS, hardness, NH4 +, F-and total Fe. Most exceeding samples belonged to middle and deep aquifers. The main types of shallow groundwater were HCO3-Ca·Mg-and HCO3·Cl-Ca·Na·Mg, while the chemical types of mid-deep groundwater were mostly HCO3-Na·Ca-and HCO3·SO4 2--Na·Ca type due to the increased Na+, SO4 2- and Cl- concentration. Study results showed that the quality of shallow groundwater became worse mainly due to human activities. The deterioration of groundwater quality in mid-deep aquifers was due to both human activities and natural occurrence of poor-quality water.


Guo G.-X.,Hydrogeology and Engineering Geology Team of Beijing | Guo G.-X.,University of Chinese Academy of Sciences | Li Y.,Beijing Bureau of Geology and Mineral Exploration and Development | Xu L.,Hydrogeology and Engineering Geology Team of Beijing | And 3 more authors.
Huanjing Kexue/Environmental Science | Year: 2014

Firstly, advances in investigation and evaluation of groundwater pollution in China in the last decade were presented, and several issues in the field which hinder the development of groundwater environment were pointed out. Then, four key concepts in risk assessment of groundwater pollution were briefly described with more emphasis on the difference between groundwater pollution assessment and groundwater quality assessment in this paper. After that, a method on risk assessment of groundwater pollution which included four indicators, the pollution assessment, the quality assessment, the vulnerability and the pollution load of groundwater, was presented based on the regional characteristics of Beijing Plain. Also, AHP and expert scoring method were applied to determine the weight of the four evaluation factors. Finally, the application of this method in Beijing Plain showed the area with high, relative high, medium, relative low and low risk of groundwater contamination was 1232.1 km2, 699.3 km2, 1951.4 km2, 2644 km2, and 133.2 km2, respectively. The study results showed that the higher risk in the western region was likely caused by the higher pollution load and its higher vulnerability, while the relatively high risk in the southeast of Beijing plain area, the Tongzhou District, is mainly caused by historical pollution sources.


Zhang X.,Hydrogeology and Engineering Geology Team of Beijing | Wang X.,Hydrogeology and Engineering Geology Team of Beijing | Xin B.,Hydrogeology and Engineering Geology Team of Beijing | Ye C.,Hydrogeology and Engineering Geology Team of Beijing | Guo G.,Hydrogeology and Engineering Geology Team of Beijing
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2011

This study was focused on characterization of organic pollutants in a typical site of north China. A total of 196 samples, including soil, air, surface water and groundwater, were collected from the site. Based on the analysis results, the distribution characteristics and possible sources of 25 volatile organics at various regions were analyzed. The health risk assessment standard of the US Environmental Protection Agency was applied to assess the health risk of the pollutants in the site. The results showed that carbon tetrachloride was the only non-attainment pollutant and mainly distributed in the groundwater. The horizontal distribution of the pollution plume was highly related with the direction of the groundwater flow and the vertical distribution was affected fairly by the samples' depth. The largest carcinogenic potentials of the carbon tetrachloride were known to be from drinking water, with the carcinogenic index value of 3.03×10-5. It exceeded the acceptable risk level and may result in the increase of 30.3 cancer patients per one million people. If the residents in the region drink the groundwater every day, their health will be affected greatly. The carcinogenic hazard index of the other two pathways, breathing and skin contact, were in the range 10-10 to 10-7, which were both below the acceptable risk level. The non-cancer hazard index of carbon tetrachloride is less than 1, indicating low non-cancer hazard health risk.


Guo G.-X.,Hydrogeology and Engineering Geology Team of Beijing
Wutan Huatan Jisuan Jishu | Year: 2011

As an important geophysical detection mediod, electric sounding have been used widely in hydrogeological, engineering geological, environmental and mineral resources work. However, the traditional data processing mediod, such as cross-section mediod, transaction mediod and section lining mediod belong to two-dimension manner. In this paper, the main three method and their merits and drawbacks are presented by using the electric sounding data within Pinggu basin. Secondly, the introduction of software Voxler, which is used in this paper, is presented simply, In the end, a sample of 3D model based on all the data of Pinggu region is given. The application results show this interpretation mediod can characterize the underground geologic body very well. The outcome of the Voxler, which are excellent complement to traditional 2D-data processing methods, can help geologists enhance the studying resolution of subsurface within the working area gready.


Wang S.,CAS Institute of Geology and Geophysics | Wang S.,China Institute of Geotechnical Investigation and Surveying Ltd. | Li L.,CAS Institute of Geology and Geophysics | Liu K.,Hydrogeology and Engineering Geology Team of Beijing | And 2 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2011

To study the mechanism of dynamic consolidation with drainage on dredged clayey soil, the model test is conducted by self-developed large-scale indoor model equipment and the dredged clayey soil from Tianjin is selected as research object. It is focused on monitoring and analyzing the dynamic variation in pore water pressure in tamping process. The model test results indicate that the water content of soil descends, density and shear strength of soil appear significant growth after consolidation. To make up the defect of model tests, numerical simulation is conducted by FLAC3D to discuss the dynamic response characteristics of dredged soil under impact loads. The instantaneous hammer-soil contact stress, displacement of soil skeleton and dynamic variation in pore water pressure are mainly studied. The results of model test and calculation both indicate that the pore water pressure appears sharp increase at the hammer-soil touching moment, and it can be divided by three phases of increasing-stable-descending. The calculation results also show that the contact force doesn't reach the maximum value at the hammer-soil touching moment. The contact force varies with ramming times and appears several bounces in tamping process. It is also found that the peak pore water pressure and peak displacement are delayed with the increasing depth and radial distance from center of the hammer bottom.


Pang Z.,CAS Institute of Geology and Geophysics | Yuan L.,CAS Institute of Geology and Geophysics | Yuan L.,University of Chinese Academy of Sciences | Huang T.,CAS Institute of Geology and Geophysics | And 5 more authors.
Journal of Earth Science | Year: 2013

Nitrate pollution is a severe problem in areas with intensive agricultural activities. This study focuses on nitrate occurrence and its constraints in a selected alluvial fan using chemical data combined with environmental isotopic tracers (18O, 3H, and 15N). Results show that groundwater nitrate in the study area is as high as 258. 0 mg/L (hereafter NO3 -) with an average of 86. 8 mg/L against national drinking water limit of 45 mg/L and a regional baseline value of 14. 4 mg/L. Outside of the riparian zone, nitrate occurrence is closely related to groundwater circulation and application of chemical fertilizer. High groundwater nitrate is found in the recharge area, where nitrate enters into groundwater through vertical infiltration, corresponding to high 3H and enriched 18O in the water. In the riparian zone, on the contrary, the fate of groundwater nitrate is strongly affected by groundwater level. Based on two sampling transects perpendicular to the riverbank, we found that the high level of nitrate corresponds to the deeper water table (25 m) near the urban center, where groundwater is heavily extracted. Groundwater nitrate is much lower (<12. 4 mg/L) at localities with a shallow water table (5 m), which is likely caused by denitrification in the aquifer. © 2013 China University of Geosciences and Springer-Verlag Berlin Heidelberg.


Jiang H.,China Earthquake Administration | Guo G.,Hydrogeology and Engineering Geology Team of Beijing | Cai X.,Geological Survey Institute of Beijing | Cai X.,Bureau of Mineral Resources | And 6 more authors.
Journal of Quaternary Science | Year: 2013

To reconstruct the history of climate and environment in East Asia during the Early Pleistocene, a palynofloral investigation was conducted on fluviolacustrine sediments in Beijing, North China. The results indicate that herb and shrub taxa were dominant in most of the samples, reflecting an open forest grassland covering the Beijing region during much of the Early Pleistocene. This vegetation generally declined during 1.68-1.25 Ma and recovered in part during 1.25-0.96 Ma. From 0.96 Ma, conifers gradually replaced broad-leaved trees, shrubs and herbs. After 0.65 Ma, the pollen abundance of conifers, shrubs and herbs all increased significantly. These vegetation changes took place in the context of long-term global cooling during the Late Cenozoic. A significant increase in Antarctic ice volume at 1.25-1.20 Ma and the resultant increased meridional temperature gradient in the Southern Ocean led to prominent anomalous warming in the tropics and increased heat/moisture flow across the Equator, probably resulting in vegetation recovery in the study area to some extent during 1.25-0.96 Ma. From 0.96 Ma, the stepwise decline of vegetation cover in the study area, especially after 0.65 Ma, was driven by further development of global cooling and increase in polar ice volume. © 2013 John Wiley & Sons, Ltd.


Liu J.,Hydrogeology and Engineering Geology Team of Beijing | Huang T.,CAS Institute of Geology and Geophysics
ISWREP 2011 - Proceedings of 2011 International Symposium on Water Resource and Environmental Protection | Year: 2011

Since deuterium excess would decrease during evaporation and has little effects by isotopic composition of initial water, rather than the relationship between δ18O (or δ2H) and salinity, it is a potential tool for determining contribution of evapoconcentration and dissolution of mineral for a given water body. The relationship between residual water fraction and deuterium excess was deduced from the Rayleigh distillation equation in the paper. The contribution of evapoconcentration and dissolution of mineral for a given water body then can be determined by comparing deuterium excess and salinity between initial water and the evapoconcentrated water. The study is important for sustainable water-salt movement and management. © 2011 IEEE.


Liu J.,Hydrogeology and Engineering Geology Team of Beijing | Huang T.,CAS Institute of Geology and Geophysics | Li J.,CAS Institute of Geology and Geophysics | Wang S.,Beijing Hydrological Station
ISWREP 2011 - Proceedings of 2011 International Symposium on Water Resource and Environmental Protection | Year: 2011

Utilization of reclaimed water instead of pumpage groundwater, is an effective approach to alleviate the crisis of groundwater resources depletion in water-scare areas when the quality of reclaimed water is satisfied for irrigation. A case study of Daxing, Beijing shows that the water quality of reclaimed water is suitable for irrigation. The groundwater depth in the reclaimed water irrigation area should be more than 6 m to prevent from reaching water table. Based on the result of numerical simulation, water table could maintain the minimal groundwater depth through the utilization of reclaimed water while decreasing 50% of groundwater pumpage from 2010 to 2020. © 2011 IEEE.

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