Xing A.G.,Shanghai JiaoTong University |
Xing A.G.,Kyoto University |
Wang G.,Kyoto University |
Yin Y.P.,China Institute of Geo Environment Monitoring |
And 6 more authors.
Engineering Geology | Year: 2014
On June 28, 2010, a large catastrophic landslide was triggered by a heavy rainfall in Guanling, Guizhou, China. This catastrophic event destroyed two villages and caused 99 casualties. The landslide involved the failure of about 985,000m3 of sandstone from the source area. The displaced materials traveled about 1300m with a descent of about 400m, covering an area of 129,000m2 with the final volume being accumulated to be 1,840,000m3, approximately. To provide information for hazard zonation of similar type of landslides in the same area, we used a dynamic model (DAN3D) to simulate the runout behavior of the displaced landslide materials, and found that a combined frictional-Vollemy model could provide the best performance in simulating this landslide and the runout is precisely duplicated with a dynamic friction angle (ϕ) of 30° and a pore pressure ratio (ru) of 0.55 for the materials at the source area and with Vollemy parameters of friction coefficient f=0.1 (dimensionless) and turbulent coefficient ξ=400m/s2. The simulated results indicated that the duration of the movement is estimated at about 60s for a mean velocity 23m/s. To examine the effectiveness of simulation by means of DAN3D and also to evaluate the reactivation potential of these displaced landslide materials depositing on the valley, we used electrical resistivity tomography (ERT) method to survey the depth and internal structure of landslide deposits. The ERT results showed that DAN3D gave a good prediction on the shape and runout distance of the landslide deposits, although the predicted maximum depths of landslide deposit on some areas were differing from those obtained by ERT method. © 2014 Elsevier B.V.
He S.-Y.,Chinese Academy of science |
He S.-Y.,University of Chinese Academy of Sciences |
Zhu L.-J.,Guizhou University |
Dong Z.-F.,Guizhou University |
Yu X.-H.,Guizhou Institute of Geo Environment Monitoring
Huanjing Kexue/Environmental Science | Year: 2010
We investigated geochemical susceptivity of groundwater in representative karst groundwater system. The results indicated that Ca2+ and Mg2+, correlative the average values of geochemical susceptivity index (GSI) were 0.73 and 0.19; HCO3 - and SO4 2-, interrelated the average values of geochemical susceptivity index were 0.92 and 0.37, are the principal cations and anions in karstic groundwater system, respectively. And the major elements are obviously characterized by the geochemical susceptivity. The rank order of geochemical susceptivity for major elements in study region is HCO3 - < Ca2+ > SO4 2- > Mg2+ > Cl- > Na+ > NO3 - > K+. The susceptive regions of groundwater system were zoned by the geochemical susceptivity index of HCO3 - (GSI(HCO3 -)), which classified as GSI(HCO3 -) < 0.5 is low-susceptivity zone, 0.5 < GSI(HCO3 -)<1 is moderate-susceptivity zone and GSI(HCO3 -)>1 is high-susceptivity zone, respectively. The groundwater systems in high-susceptivity zone may become as a collected and genetic room for pollutants. Furthermore, both continual or active exchange and mutual recharge between surface water and groundwater in high-susceptivity zones might induce intersectant pollution and serious cycle.
Xing A.,Shanghai JiaoTong University |
Xu Q.,Chengdu University of Technology |
Zhu Y.,Guizhou Institute of Geo Environment Monitoring |
Zhu J.,Center for Hydrogeology and Environmental Geology Survey |
Jiang Y.,Kyoto University
Landslides | Year: 2016
At about 8:30 p.m. on 27 August 2014, a catastrophic rock avalanche suddenly occurred in Fuquan, Yunnan, southwestern China. This landslide and related impulse water waves destroyed two villages and killed 23 persons. The impulse waves occurred after initiation of the landslide, caused by the main part of the slide mass rapidly plunging into a water-filled quarry below the source area. The wave, comprising muddy water and rock debris, impacted the opposite slope of the quarry on the western side of the runout path and washed away three homes in Xinwan village. Part of the displaced material traveled a horizontal distance of about 40 m from its source and destroyed the village of Xiaoba. To provide information for potential landslide hazard zonation in this area, a combined landslide–wave simulation was undertaken. A dynamic landslide analysis (DAN-W) model is used to simulate the landslide propagation before entering the quarry, while Fluent (Ansys Inc., USA) is used to simulate the impulse wave generation and propagation. Output data from the DAN-W simulation are used as input parameters for wave modeling, and there is good agreement between the observed and simulated results of the landslide propagation. Notably, the locations affected by recordable waves according to the simulation correspond to those recorded by field investigation. © 2016 Springer-Verlag Berlin Heidelberg
He S.,Guizhou University |
Zhu L.,Guizhou University |
Yang R.,Guizhou University |
Shen Z.,Guizhou University |
Yu X.,Guizhou Institute of Geo Environment Monitoring
Chinese Journal of Geochemistry | Year: 2011
Fifty-seven shallow groundwater samples were collected from Guiyang karst basin, China, to analyze the aqueous rare-earth elements in low-water seasons and it is shown that the total amount of rare-earth elements (ΣREE) in karst groundwater is exceedingly low compared with that in carbonate rocks or weathering crusts of carbonate rocks, and ranges from 0.01 to 0.43, from 0.03 to 0.27, from 0.03 to 0.19 and from 0.05 to 1.38 μg·L -1 for dolomite, dolomitic & limestone, limestone and clastic rock aquifer, respectively. Both distributions and contents of rare-earth elements (REE) in karst groundwater reflect the lithology of host rocks or weathering crusts of carbonate rocks through which groundwater flows. The chondrite-normalized patterns show a non-flat profile with higher enrichment of slightly light rare-earth elements (LREE) than heavy rare-earth elements (HREE), prominent fractionation between LREE and HREE, negative Ce anomalies and negative or positive Eu anomalies. There is more obvious fractionation between LREE and HREE in groundwater than that in carbonate rocks and their weathering crusts due to high contents of HCO 3 - and PH in groundwater. In shallow karst groundwater, REE(CO 3) n 2n-3 (n=1 and 2) is the main inorganic species of REE. But for a clastic rock aquifer, both REESO 4 + and REECO 3 + are the main inorganic species of REE. Species of REE in groundwater is closely associated with the hydrochemical type of groundwater which is predominated by the lithology of host rocks, groundwater-rock interaction and weathering-pedogenesis of carbonate rocks. © 2011 Science Press, Institute of Geochemistry, CAS and Springer Berlin Heidelberg.
Ma T.,Wuhan University |
Wang Y.,Wuhan University |
Luo W.,Wuhan University |
Luo W.,Guizhou Institute of Geo Environment Monitoring |
And 4 more authors.
Chinese Journal of Geochemistry | Year: 2010
Loess has unique compositions and structural characteristics and can be used for environmental protection. Differences between the surface characteristics of the Malan loess from the suburbs of Taiyuan, Shanxi Province before and after reaction with Cr(III) solution were studied by SEM/EDS, IR and XRD. The results showed that the Malan loess has a strong ability to remove Cr(III) from the solution. The surface characteristics of loess include an effect on Cr(III) in solution, as supported by the strong test evidence including the disappearance of Cr peak in the EDS spectrum, the disappearance of carbonate characteristic peaks in the infrared spectrogram, and the positive correlation between Fe and Cr peaks. © 2010 Science Press, Institute of Geochemistry, CAS and Springer Berlin Heidelberg.
Luo W.,Guizhou Institute of Geo Environment Monitoring |
Yang X.,Guizhou Institute of Geo Environment Monitoring |
Pei Y.,Guizhou Institute of Geo Environment Monitoring |
Shen C.,Guizhou Institute of Geo Environment Monitoring
WIT Transactions on Ecology and the Environment | Year: 2014
More than 400 ground water polluted sites in Guizhou province were field investigated by generalizing the pollution process. We found that ground water pollution in Karst areas can be divided into direct pollution and indirect pollution. According to the pathway of groundwater pollution, direct pollution can be divided into four types which were epi-Karst, artificial channel, mining activities and geological hazard. Indirect pollution can be divided into five types according to its permeation medium, namely, Karst fracture permeation, soil infiltration, surface water permeation, solid waste permeation and aquifer leakage. The field investigation results showed that most polluted sites were included with this classification method, and 80% of ground water pollution in Karst areas belongs to indirect pollution. The ground water pollution characteristics in Karst areas were summarized and some suggestions about ground water pollution controlling measures were forwarded. © 2013 WIT Press.