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Pang G.-X.,Exploitation Institute of Environmental Geology Hebei Province | Qiang Y.,Center for Hydrogeology and Environmental Geology
Proceedings - 2016 International Conference on Smart City and Systems Engineering, ICSCSE 2016 | Year: 2016

Takingthe typical gravel soil accumulation landslide-Huang Lianshu landslide for study, the paper presents a deep analysis of formation mechanism and for deformation characteristics rainfall-induced landslide, to the measured terrain data, survey data, test data as the basis, the use of geoscience simulation software GeoStudio the SEEP / W module and SLOPE / W module to establish the appropriate geological model set different conditions based on rainfall-induced landslides and landslide stability calculation in different conditions. Stability calculated landslide and heavy rain storm was a significant positive correlation, the smaller the stability of 90mm sensitive response, disaster mechanism of the landslide and the destruction process of the class landslide Hazard prevention disposal and provided valuable experience. © 2016 IEEE.

He J.,Jilin University | He J.,Center for Hydrogeology and Environmental Geology | An Y.,Center for Hydrogeology and Environmental Geology | Zhang F.,Center for Hydrogeology and Environmental Geology
Journal of Geochemical Exploration | Year: 2013

To better understand geochemical processes leading to the fluoride enrichment in the groundwater of the Zhangye basin, chemical parameters, stable isotopic compositions, tritium and radiocarbon data were obtained for groundwater samples (depth 10m-250m) from three hydrogeological environments: Longshou and Qilian piedmont and the central fine soil plain. Groundwater (n=7 out of a total of 8 samples) with high fluoride concentration (>1.0mg/l) is found in the piedmont of the Longshou Mountains, with a maximum value of 3.06mg/l. Fluoride concentrations in the groundwater also gradually increase from the piedmont of the Qilian Mountains from 0.15 to 0.45mg/l (n=7) to the fine soil plain from 0.21 to 2.78mg/l (n=23) located in the center of the Zhangye Basin. The high fluoride concentration in groundwater correlates with the prevalence of SO4-Cl-Na-Mg and alkaline conditions. Isotope and tritium analyses indicate that streams and rivers rapidly recharge the groundwater in the piedmont of the Qilian Mountains and the fine soil plain. In contrast, the high fluoride groundwaters in the piedmont of the Longshou Mountains display 14C ages older than 8ka, indicating a longer water-rock interaction time. Using the ionic ratio plot and the Gibbs' diagram, evaporation and dissolution of fluorine-rich minerals are shown to be major factors resulting in the elevated fluoride concentrations. The results have implications for managing groundwater resources for drinking water supply to ensure public safety in the Zhangye Basin and other inland arid basins in northwestern China. © 2012.

Guo Q.,China University of Geosciences | Guo Q.,Water Resources University | Guo H.,China University of Geosciences | Guo H.,Water Resources University | And 3 more authors.
Journal of Hydrology | Year: 2014

Little is known about hydrogeochemical contrasts between low and high As groundwaters and their connection to As mobilization in the Yinchuan Basin. Investigations were carried out to evaluate As distribution and geochemical processes for As mobilization in three regions, including piedmont proluvial fans (PA), dry farmland (DF) and paddy farmland (PF). Ninety-two groundwater samples, 4 surface water samples, and 66 sediments samples were collected and analyzed for chemical and isotopic components. Results show that low As groundwater is generally found in PA. However, high As concentrations (up to 105μgL-1) are mainly observed in groundwaters from DF and PF, which are associated with reducing conditions. High As groundwater is characterized by high concentrations of NH4 +, dissolved Mn, dissolved Fe and Fe(II), and low concentrations of NO3 - and SO4 2-. The intensive irrigation in PF recharges the aquifers by vertical infiltration of the diverted Yellow River water, and leads to the higher redox potentials and the lower dissolved As in comparison with those in DF. Environmental isotopes (δ18O and δD) show that evaporation due to the intensive irrigation plays a minor role in As enrichment. The positive correlation between As and dissolved Fe suggests that groundwater As would result from the reductive dissolution of Fe oxides. Besides, dissolved P may be involved in competing with As for binding sites on Fe oxide minerals. Sediment As ranges between 3.94 and 75.2mgkg-1. HCl-leached As accounts for 60% of total As in the sediments, while H3PO4-leached As accounts for 5%. Depth-matched samples show a good correlation between dissolved As and H3PO4-leached As in sediments. Arsenic distribution coefficient (Kd), calculated from H3PO4-leached As and dissolved As, ranges between 5.08 and 17.3cm3g-1, which generally depends on groundwater redox potentials. In reducing conditions, low values are found with As being preferentially partitioned into groundwater. © 2014 Elsevier B.V.

Schroder I.F.,Geoscience Australia | Zhang H.,Center for Hydrogeology and Environmental Geology | Zhang C.,Center for Hydrogeology and Environmental Geology | Feitz A.J.,Geoscience Australia
International Journal of Greenhouse Gas Control | Year: 2016

Following the drilling of a shallow natural CO2 reservoir at the Qinghai research site, west of Haidong, China, it was discovered that CO2 was continuously leaking from the wellbore due to well-failure. The site has become a useful research facility in China for studying CO2 leakage and monitoring technologies for application to geological storage sites of CO2. During an eight day period in 2014, soil gas and soil flux surveys were conducted to characterise the distribution, magnitude and likely source of the leaking CO2. Two different sampling patterns were utilised during soil flux surveys. A regular sampling grid was used to spatially map out the two high-flux zones which were located 20–50 m away from the wellhead. An irregular sampling grid, with higher sampling density in the high-flux zones, allowed for more accurate mapping of the leak distribution and estimation of total field emission rate using cubic interpolation. The total CO2 emission rate for the site was estimated at 649-1015 kgCO2/d and there appeared to be some degree of spatial correlation between observed CO2 fluxes and elevated surface H2O fluxes. Sixteen soil gas wells were installed across the field to test the real-time application of Romanak et al.’s (2012) process-based approach for soil gas measurements (using ratios of major soil gas components to identify the CO2 source) using a portable multi-gas analyser. Results clearly identified CO2 as being derived from one exogenous source, and are consistent with gas samples collected for laboratory analysis. Carbon-13 isotopes in the centre of each leak zone (−0.21‰ and −0.22‰) indicate the underlying CO2 is likely sourced from the thermal decomposition of marine carbonates. Surface soil mineralisation (predominantly calcite) can be used to infer prior distribution of the CO2 hotspots and as a consequence highlighted plume migration of 20 m in 11 years. The broadening of the affected area beyond the wellbore at the Qinghai research site markedly increases the area that needs surveying at sufficient density to detect a leak. This challenges the role of soil gas and soil flux in a CCS monitoring and verification program for leak detection, suggesting that these techniques may be better applied for characterising the source and emission rate of a CO2 leak, respectively. © 2016

Han S.,Water Resources University | Han S.,Center for Hydrogeology and Environmental Geology | Zhang F.,Center for Hydrogeology and Environmental Geology | Zhang H.,Center for Hydrogeology and Environmental Geology | And 4 more authors.
Journal of Geochemical Exploration | Year: 2013

Groundwater is a strategic resource in Yinchuan Plain, with deep groundwater increasingly used for drinking water supply to reduce arsenic exposure of rural villagers who have relied on shallow tube wells for drinking. To understand the sources and mobilization processes for arsenic enrichment in groundwater, a well water and sediment geochemistry study was carried out. Considerable spatial variability of groundwater arsenic exists. Arsenic concentration in deeper groundwater (40-250m) was generally less than 10μg/L (n=26) except for seven wells, with a mean of 7.0μg/L (n=33). For shallower depths (4-40m), As concentration increased from <1μg/L in the alluvial plain at higher elevation to 177μg/L near the center of alluvial lacustrine plain at lower elevation. Two clusters of high arsenic, shallow groundwater run nearly parallel to the Yellow River present day and ancient courses as two narrow strips where groundwater flow is sluggish. Arsenic content in sediments ranged from 3.7μg/g to 49.8μg/g with an average of 9.2μg/g, and was positively correlated with concentrations of sediment Cu, Fe2O3, Mn, Ba, Zn, F and organic C. Concentrations of arsenic between Dec. 2007 to Aug. 2011 in groundwater samples collected monthly vary more for the shallower depths (8m: 76±29μg/L; 12m: 116±27μg/L; 15m: 88±26μg/L; 20m: 164±14μg/L) than for the deeper depths (30m: 35±4μg/L; 80m: 33±5μg/L). Temporal variability of As concentrations in shallow groundwater correlates with water levels, driven by irrigation to a large extent. © 2012 Elsevier B.V.

Xunjian X.,Bureau of Geological Exploration of Chongqing | Qiang Y.,Center for Hydrogeology and Environmental Geology
Proceedings - 2014 5th International Conference on Intelligent Systems Design and Engineering Applications, ISDEA 2014 | Year: 2014

A large number of accumulation landslides induced by water storage in the Three Gorges reservoir, after the landslide danger happening, its stability evolutionary trend is the focus of the research, which have important sense to landslides prevention and control. This paper selects two of the accumulation landslides which has different structure, Qingshi landslide and Huanglianshu landslide, as the research object. Based on the major deformation area of the landslide changes with reservoir water fluctuation, analyzes on the soil accumulation landslides and rock accumulation landslide stability evolutionary trend was made. It is concluded that major deformation of rock mass accumulation landslide area is not affected by reservoir water fluctuation, while soil accumulation landslide response positively during the first reservoir water fluctuation process, the deformation of the disintegration region is significantly higher than the overall regional. Accumulation landslide reaches a new equilibrium after hydrology 1-2 years, and the stability to give priority to with rainfall influence. © 2014 IEEE.

Yang Z.,Center for Hydrogeology and Environmental Geology | Hao W.,Center for Hydrogeology and Environmental Geology
Geological Engineering and Mining Exploration in Central Asia - Proceeding Source: The XVIII Kerulien International Conference on Geology, KICG 2013 | Year: 2013

In this paper, we compare the advantages and disadvantages of karst collapse monitoring technology. Combining with previous experience, we put forward a notion that combines BOTDR with FBG to monitor soil deformation of Karst Collapse. Through analysing the karst collapse geological conditions east of Tangshan river, we selected experiment fiber ,worked out laying scheme, and we described the test process in detail, explored the method of temperature compensation in the field, after repetitive data acquisition and analysis, we could conclude that optical fiber sensing technology could realize the multi-point positioning of rock and soil deformation, capture the rock and soil mass deformation and describe the collapse deformation boundary. By combining FBG with BOTDR in monitoring application, we can overcome the defects of the two monitoring methods, thereby obtaining all information of the collapse body, it has a useful application prospect.

Le Q.,Center For Hydrogeology and Environmental Geology
Applied Mechanics and Materials | Year: 2012

Based on the research of interlayer-gliding structures in Panbei and Panji No.1 coal mine that are located in the each wing of Panji anticline, the Panji mining area is divided into 9 main interlayer-gliding areas and 29 sub-regions. The results indicate that the interlayer-gliding structures mainly developed in the anticline wings, which show obvious symmetry at the type and distribution. The types of the interlayer-gliding structures are fault-sliding and corrugation type in the wings and fracture type in the core area. The type and manifestation of the interlayer-gliding structures also show symmetry in the similar depth. From up to down, the interlayer-gliding type show obvious regularity that fracture type is mainly developed in the shallow area, down is fault-sliding type and corrugation type is mainly developed in the deep or the interchange of the faults. Take fuzzy comprehensive evaluation method to evaluate the inter-gliding structure in west area of Panji No.1 coal mine. The results showed that the results from using fuzzy comprehensive assessment were similar with the results exposed by coal mine. Good effects were obtained for predicting the development intensity of the seam-gliding structure in deep unmined areas in combination with geological conditions of coal mine, providing references for production arrangement of coal mine. © (2012) Trans Tech Publications, Switzerland.

Zhou J.,Central South University | Zhou J.,Hunan University of Science and Technology | Deng C.,Central South University | Si S.,Central South University | And 2 more authors.
Electrochimica Acta | Year: 2011

In-situ technique quartz crystal microbalance (QCM), differential pulse voltammetry (DPV) and cyclic voltammetry (CV) were employed to investigate the effect of disodium ethylenediamine tetraacetate (EDTA) on photocatalytic reduction of mercury onto nanocrystalline titania (TiO2). Effects of EDTA on adsorption of Hg(II) and its photocatalytic reduction process at the surface of TiO2 in different pH solutions had been studied in detail. From the in-situ response to the adsorption of Hg(II) onto TiO2, the reaction rate and saturation adsorption amount were estimated about 4.71 × 10-6 g mol-1 min-1 and 46.36 (mg Hg(II)/g TiO2) via the model of pseudo-second-order kinetics respectively. The photocatalytic reduction of Hg at the surface of TiO 2 was influenced by pH and the mole ratio of Hg(II) to EDTA. When the ratio of Hg(II) to EDTA 1:1, it was most favorable for the photocatalytic reduction of mercury. In addition, the effects of HCOOH and EDTA on the reduction of Hg(II) was comparatively investigated and the mechanism on the photocatlytic reduction of mercury was illustrated. Therefore, it could be concluded that QCM, DPV and CV were effective methods for the investigation of photocatalytic reduction of complex heavy metal ions onto the surface of nanocrystalline TiO2. © 2010 Published by Elsevier Ltd.

PubMed | Water Resources University, Center for Hydrogeology and Environmental Geology and China University of Geosciences
Type: Journal Article | Journal: Environmental geochemistry and health | Year: 2016

High-F(-) groundwater is widely distributed in Xiji County, which endangers the safety of drinking water. In order to evaluate the key factors controlling the origin and geochemical mechanisms of F(-) enrichment in groundwater at Xiji County, one hundred and five groundwater samples and sixty-two sediment samples were collected. Fluoride concentration in the groundwater samples ranged from 0.2 to 3.01mg/L (mean 1.13mg/L), with 17% exceeding the WHO drinking water guideline value of 1.5mg/L and 48% exceeding the Chinese drinking water guideline value of 1.0mg/L. High-F(-) groundwaters were characterized by hydrochemical types of Na-HCO3 and Na-SO4Cl, which were found in Quaternary sediment aquifer and in Tertiary clastic aquifer, respectively. Conditions favorable for F(-) enrichment in groundwater included weakly alkaline pH (7.2-8.9), low concentration of Ca(2+), and high concentrations of HCO3 (-) and Na(+). Calcite and fluorite were the main minerals controlling F(-) concentration in groundwaters. The hydrolysis of F-bearing minerals in aquifer sediments was the more important process for F(-) release in Tertiary clastic aquifer, which was facilitated by long residence time of groundwater, in comparison with Quaternary sediment aquifer. Cation exchange would also play important roles, which removed Ca(2+) and Mg(2+) and led to more free mobility of F(-) in groundwater and permitted dissolution of fluorite, especially in Tertiary clastic aquifer. However, evapotranspiration and competing adsorption of B and HCO3 (-) were the more important processes for F(-) enrichment in Quaternary groundwater. Groundwater in Lower Cretaceous aquifer had relatively low F(-) concentration, which was considered to be the potential drinking water resource.

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