Key Laboratory of Land Subsidence Monitoring and Prevention

Shanghai, China

Key Laboratory of Land Subsidence Monitoring and Prevention

Shanghai, China
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Wang H.-M.,Shanghai University | Wang H.-M.,Key Laboratory of Land Subsidence Monitoring and Prevention | Wang Y.,Shanghai University | Jiao X.,Shanghai Institute of Geological Survey | And 2 more authors.
Desalination and Water Treatment | Year: 2014

Large-scale artificial recharge is planning for controlling subsidence in the fourth confined aquifer (A4) in Shanghai. However, it is unknown what negative impact would occur after the injection of tap water into A4. Based on collected material and data available in some sporadic experiments about tap water recharge to A2, A3, and A4 from the 1960s to the 1980s, this paper gave some evaluations on the changes of groundwater chemical characteristics, migration range of recharge water in single well and groups of wells. And various factors affecting groundwater quality during the artificial injection were discussed. The results showed that the physical and chemical composition of groundwater trended to that of recharge water, maximum influence distance of recharge water in single well in A2 was about 100 m in 20 years, and the maximum radius of groups of wells in A4 was about 1,000 m, while the range causing significant changes in groundwater quality was less than 1,000 m. This information will offer scientific basis for the large-scale artificial recharge in the near future. © 2013 © 2013 Balaban Desalination Publications. All rights reserved.


Wang H.-M.,Shanghai University | Wang H.-M.,Key Laboratory of Land Subsidence Monitoring and Prevention | Wang Y.,Shanghai University | Jiao X.,Shanghai Institute of Geological Survey | Qian G.-R.,Shanghai University
Desalination and Water Treatment | Year: 2014

Land subsidence resulting from over-exploited groundwater has become a leading factor restricting the sustainable development of resources, environment, and economy in Shanghai. To design management plans to control the environment geology calamity problems arisen by land subsidence effectively, this research constructed risk index system on the basis of risk source identification of subsidence and then established risk assessment model. The risk index system is composed of hazardous conditions and vulnerability of land subsidence. Results from comprehensive consideration of the model calculations, subsidence distribution and local socio-economic trends showed that the controlling district of land subsidence in Shanghai can be divided into three subsidence-primary control zone (Zone I), second control zone (Zone II), and normal control district (Zone III), corresponding with a high, moderate, low subsidence risk, respectively. On the basis of Shanghai urban and rural planning, the control target scheme of land subsidence with each zone in the future, different groundwater, resources management schemes are put forward, which mainly refer to control groundwater exploitation, to perform artificial recharge and to strengthen construction of recharge wells. © 2013 © 2013 Balaban Desalination Publications. All rights reserved.


Wu X.,Jilin University | Zhang W.,Jilin University | Du S.,Jilin University | Shi X.F.,Jilin University | And 6 more authors.
Arabian Journal of Geosciences | Year: 2016

Field tests and laboratory experiments were performed, using an artificial groundwater recharging site in Southeast China as an example, to investigate the migration and transformation of manganese during the artificial recharging of a deep confined aquifer. The migration and transformation of total manganese and divalent manganese (Mn(II)) were influenced by mixing, oxidation reactions, and the dissolution of minerals containing manganese, and increasing the dissolved oxygen (DO) concentration was found to promote the dissolution of minerals containing manganese. The laboratory experiments showed that the retardation factors were higher upstream than downstream of the recharging hole. The amount of dissolution that occurred decreased, and the amount of mixing that occurred increased as the distance from the recharging hole increased. The DO concentration decreased as the amount of dissolution of minerals containing manganese that occurred decreased. A high temperature, a high DO concentration, and the presence of microorganisms were found to promote the dissolution of minerals containing manganese, which caused the total manganese and Mn(II) concentrations to increase. © 2016, Saudi Society for Geosciences.


Shi X.,Jilin University | Zhang W.,Jilin University | Wang H.,Shanghai Institute of Geological Survey | Wang H.,Shanghai Land Subsidence Control Engineering Research Center | And 5 more authors.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2013

The water-rock interaction during the artificial recharge is an important influencing factor of groundwater environment quality in the recharge aquifer. The laboratory experiment and hydrogeochemical modeling were used to study the mechanism of water-rock interaction during the artificial recharge. The results of the research showed that the TDS of the mixed water decreased and the water type became HCO3·Cl-Na·Ca from Cl·HCO3-Na with the increase in the proportion of the recharge water affected by the mixing; the TDS of the mixed water increased and the concentrations of the major ions showed increasing trend as the water-rock interaction proceeded in the same proportion of the recharge water affected by the water-rock interaction, but the TDS of the mixed water was more than original groundwater when the proportion of recharge water was 10% only (up 5%). The sources of major ions dissolved from the experimental medium: Ca2+, Mg2+ and HCO3 - originated from the dissolution of carbonate minerals and Na+ originated from the dissolution of halite. The water-rock interaction included the dissolution of calcite, dolomite, potash feldspar, halite, CO2 and the precipitation of illite during the artificial recharge. The correlation between the dissolved quantity of potash feldspar and the precipitated quantity of illite and the correlation between the dissolved quantity of carbonate minerals and the dissolved quantity of CO2 were strong with the correlation coefficient 1.00 and 0.78 respectively with a significance level of 0.05. The correlation coefficient was 0.97 between the reacted quantity of silicate minerals and the proportion of the recharge water that showed extremely strong correlation, but the correlation coefficient was 0.52 with a significance level of 0.01 between the reacted quantity of carbonate minerals and the proportion of the recharge water that showed weak correlation. This correlation study above provided basis for determining the mechanism of water-rock interaction, the original way of major ions in the groundwater and the quantitative analysis of the impact on the aquifer medium during the artificial recharge.


Lin X.-Y.,Jilin University | Zhang W.-J.,Jilin University | He H.-Y.,Jilin University | Shi X.-F.,Jilin University | And 6 more authors.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2012

As a result of the water-rock interaction mechanism in artificial recharge process is more complex, the evaluation on influence of groundwater quality during the artificial recharge process is scarce.. The authors discuss the trends of solute component and their associated water-rock interaction during the artificial recharge process based on pilot scale experiments conducted in the laboratory.. Experiment results showed that: in the groundwater recharge process, the ion composition of groundwater were mainly affected by the mixing, cations exchange adsorption and aquifer mineral phase (calcite, dolomite, potassium feldspar) dissolution.. Due to the influence of underground anaerobic environment developing to the aerobic environment in the artificial recharge process, the elements of As, Cr, Fe in porous media has dissolved out.. Besides, the As-Fe element variation showed well correlation.. Along with the increase of artificial recharge time, the effect range of groundwater quality was increased.. And the chemical type of groundwater was changed from the initial Cl-HCO 3-Na to Cl-HCO 3-Na-Ca gradually during the recharge process..


Zhang W.,Jilin University | Huan Y.,Jilin University | Liu D.,Jilin University | Wang H.,Key Laboratory of Land Subsidence Monitoring and Prevention | And 5 more authors.
Environmental Earth Sciences | Year: 2016

Managed aquifer recharge is one of the most popular methods for dealing with local water shortage issues, and the bacterial community could be a vital factor influencing groundwater quality during this process. In this study, analysis of variations in groundwater components during artificial recharge revealed three stages at a text site in China. During stage I, total iron and dissolved organic carbon levels are stable basically, dissolved oxygen and SO4 2− levels have rising trends, NO3 − curve varied not obviously. Variation curves show increases in dissolved oxygen, NO3 −, SO4 2− and stabilization in dissolved organic carbon and total iron at stage II. During stage III, dissolved oxygen and NO3 − have rising trends, dissolved organic carbon, total iron, and SO4 2− keep stable. At 25 and 70 days the Simpson and Shannon–Wiener indices show that microbial community richness and population diversity underwent a gradual dynamic change after recharge water arrived. Correlation analysis shows that the Simpson index was mainly affected by dissolved oxygen and NO3 −. PCR-DGGE confirmed these findings. Overall, the results revealed that the main bacterial communities reduce total nitrogen, total phosphorous, and chemical oxygen demand, which corresponded to the calculated correlation index. © 2015, Springer-Verlag Berlin Heidelberg.


Wu J.,Tongji University | Hu F.,Tongji University | Tianliang Y.,Shanghai Institute of Geological Survey | Tianliang Y.,Key Laboratory of Land Subsidence Monitoring and Prevention
4th International Workshop on Earth Observation and Remote Sensing Applications, EORSA 2016 - Proceedings | Year: 2016

Persistent scatterer interferometry(PSI) technology has been applied to ground subsidence monitoring in urban area and achieved good results. However, only displacement along the direction of radar line of sight can be obtained by single platform SAR images, so the deformation results can't reflect the real settlement in the vertical direction. With the increasing of current space-borne SAR satellites, more measurements make it possible to reconstruct the vertical subsidence by the least squares solution using SAR images from different side looking angles. This paper outlines the technical process of extracting vertical deformation rate by using multi-platform PSI method. 43 km levee of Huangpu River, which passes through the Shanghai central urban area, is chosen as a test for monitoring their ground subsidence. 35 scenes of COSMO-SkyMed ascending images, 35 scenes of COSMO-SkyMed descending images and 16 scenes of TerraSAR-X images obtained from 2009 to 2010 are processed to extract ground subsidence of 1km width zone along Huangpu River. The deformation rates obtained by different platform show strong consistency and the vertical deformation rates derived by the multi-platform after comparing with existing leveling measurements show high accuracy. © 2016 IEEE.


Qin X.,State Key Laboratory of Engineering in Surveying | Yang M.,State Key Laboratory of Engineering in Surveying | Wang H.,Key Laboratory of Land Subsidence Monitoring and Prevention | Wang H.,Shanghai Institute of Geological Survey | And 6 more authors.
Cehui Xuebao/Acta Geodaetica et Cartographica Sinica | Year: 2016

In order to make sure the security and sustainable development of the urban rail transit, the PS-InSAR technology is introduced into the deformation monitoring of urban rail transit. Taking Shanghai as an example, it is analyzed that the characteristics of surface deformation along the rail transit. Firstly, 26 TerraSAR-X images are used to carry out the high-resolution PS-InSAR subsidence fine measurements in Shanghai for the overall land subsiding characteristics of rail transit. Then, the detail subsidence pattern and the driving force is discussed by classified the rail transit with different construction periods and building modes. Finally, the accuracy of the results is verified by leveling in the same period. The results show that rapid urbanization construction has become a main reason for the subsidence of Shanghai rail transit. Rail transit with different construction periods and building modes show various deformation characteristics. Earlier sections are more stable than later sections and elevated sections have smaller subsidence rate than underground sections. The verification results show fairly consistent agreement. The results further illustrate that it is feasible to use the high-resolution PS-InSAR technology into the deformation monitoring, management, maintenance and early warning of urban public transportation projects. It can also provide decision support for planning and construction of urban public transportation. © 2016, Surveying and Mapping Press. All right reserved.

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