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Wang Y.-J.,China University of Geosciences | Wu F.-D.,China University of Geosciences | Mei X.,China University of Geosciences | Wang K.-M.,Hydrogeology and Engineering Geology Prospecting Institute of Heilongjiang Province | And 3 more authors.
Acta Geoscientica Sinica | Year: 2014

There exist some problems concerning national geo-parks, such as random border demarcation, excessively large limits, and unclear grading of the protected area of geo-heritages, suggesting the lack of theoretical support during planning and construction of geo-parks. The authors investigated problems related to geo-heritage protection, including the boundary and protection grade of geo-heritages. The concept of concentration and sensitivity of geo-heritage was introduced to this study to define protected areas of geo-heritages. On such a basis, the authors determined the grade of the protected area in Bayan Nur National Geo-park. Some appropriate protective measures were also put forward in this paper. Source

Zhang Y.,Jilin University | Gao P.,Jilin University | Yu Z.,Jilin University | Fang J.,Jilin University | Li C.,Hydrogeology and Engineering Geology Prospecting Institute of Heilongjiang Province
Energy and Buildings | Year: 2014

Eleven representative sites were selected in this study to present the characteristics of ground thermal properties in Harbin, China. The initial ground temperature field was measured, and the temperature ranges of the solar warming, constant temperature, and increasing temperature layers were determined. The 22 thermal response tests (TRTs) for 11 boreholes were examined with two heating powers (4.2 kW and 6.5 kW). Analysis of thermal properties was performed in the laboratory. A total of 337 representative samples of rock and soil were analyzed, and their thermal properties were measured in laboratory tests, and the results of these tests are not consistent with those of TRTs. The overall characteristics of ground thermal conductivity are determined according to overall distribution. © 2013 Published by Elsevier B.V. Source

Wang K.-M.,China University of Geosciences | Wang K.-M.,Hydrogeology and Engineering Geology Prospecting Institute of Heilongjiang Province | Wu F.-D.,China University of Geosciences | Zhang J.-P.,China University of Geosciences
Acta Geoscientica Sinica | Year: 2013

Geoheritages are not only the core of the geopark but also an important type of tourism resources. In this paper, the authors have classified the geoheritages in the Yanqing Geopark of Beijing into different types, and carried out qualitative and quantitative evaluation of the geoheritage value. Qualitative evaluation included the scientific value, aesthetic value and tourism development value of the geopark. For quantitative evaluation, the comprehensive evaluation method was chosen, which combined the evaluation algorithm of Analytic Hierarch Process (AHP) with Expert Scoring Method. Finally the authors weighted and calculated the average score of the major geoheritages in the Yanqing Geopark of Beijing. The evaluation of geoheritages in the Yanqing Geopark of Beijing has provided a theoretical guarantee for the development and planning of the value of geoheritages, especially for sustainable development. Source

Fu D.-G.,Chinese Ministry of Water Resources | Liu J.-P.,Wuhan University | Zhou L.-M.,Chinese Ministry of Water Resources | Xu H.,Changjiang Scientific Research Institute | And 2 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2015

Obtaining shear-wave velocity and thickness of soft interlayer with higher precision is always one of the difficulties in inversion of Rayleigh-wave dispersion curve, and it is not obviously improved when only depending on the improved algorithm and multimode inversion for low-sensitivity soft interlayer. The improved algorithm and combination of multimode and nonlinear Bayes' theorem are adopted to invert low-sensitivity soft interlayer. The damping inertia weight and chaos are added into the particle swarm optimization as improved algorithm. However, the improved algorithm does not solve the problem with low-sensitivity soft interlayer models. To analyze and evaluate the factors affecting the accuracy of inversion from the perspective of the inversion solution, the unbiased Metropolis-Hastings sampling (MHS) method is used for numerical integration posterior probability, and the rotation of parameters is used to improve the efficiency of sampling. The obtained integral 1D and mixed marginal probability distributions and correlation sufficiend matrix of parameters reflect the uncertainty and parameter inversion solution for correlation and other information. To solve the problem of low-curacy inversion of low-sensitivity soft interlayer, the Bayesian information criterion (BIC) is employed to determine the optimal parameters of the model. The optimal model agrees with the theoretical one. Applying the nonlinear Bayesian inversion method and BIC to invert the measured data of seepage prevention wall, the obtained inversion profiles are also in good agreement with the structure of the known seepage prevention wall. ©, 2015, Chinese Society of Civil Engineering. All right reserved. Source

Huang G.,Beijing Academy of Food science | Huang G.,Water Resources University | Huang Y.,National Research Center for Geoanalysis | Hu H.,Hydrogeology and Engineering Geology Prospecting Institute of Heilongjiang Province | And 3 more authors.
Chemosphere | Year: 2015

A novel two-layer heterotrophic-autotrophic denitrification (HAD) permeable reactive barrier (PRB) was proposed for remediating nitrate-nitrogen contaminated groundwater in an oxygen rich environment, which has a packing structure of an upstream pine bark layer and a downstream spongy iron and river sand mixture layer. The HAD PRB involves biological deoxygenation, heterotrophic denitrification, hydrogenotrophic denitrification, and anaerobic Fe corrosion. Column and batch experiments were performed to: (1) investigate the NO3--N removal and inorganic geochemistry; (2) explore the nitrogen transformation and removal mechanisms; (3) identify the hydrogenotrophic denitrification capacity; and (4) evaluate the HAD performance by comparison with other approaches. The results showed that the HAD PRB could maintain constant high NO3--N removal efficiency (>91%) before 38 pore volumes (PVs) of operation (corresponding to 504d), form little or even negative NO2--N during the 45 PVs, and produce low NH4+-N after 10 PVs. Aerobic heterotrophic bacteria played a dominant role in oxygen depletion via aerobic respiration, providing more CO2 for hydrogenotrophic denitrification. The HAD PRB significantly relied on heterotrophic denitrification. Hydrogenotrophic denitrification removed 10-20% of the initial NO3--N. Effluent total organic carbon decreased from 403.44mgL-1 at PV 1 to 9.34mgL-1 at PV 45. Packing structure had a noticeable effect on its denitrification. © 2015 Elsevier Ltd. Source

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