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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 | 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. Source


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. Source


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. Source


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. Source


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. Source

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