TY - JOUR
T1 - Investigation of alternative mechanisms of aquifer-system compaction and land subsidence in Shanghai
AU - Yuan, Y.
AU - Xu, Y. S.
AU - Shen, S. L.
AU - Zhang, N.
N1 - Funding Information:
Acknowledgements. The research work described herein was funded by the National Nature Science Foundation of China (Grant No. 41472252) and partially funded by the National Basic Research Program of China (973 Program: 2015CB057806). These financial supports are gratefully acknowledged.
Publisher Copyright:
© Author(s) 2015. CC Attribution 3.0 License.
PY - 2015/11/12
Y1 - 2015/11/12
N2 - Alternative subsidence mechanisms related to groundwater extration and surface loading of built infrastructure in Shanghai have been evaluated to explain continued subsidence despite the controlled reduction of groundwater extraction. The traditional theory of aquifer-system compaction embodied in the aquitard drainage model cannot fully explain this phenomenon. Two possible alternative mechanisms were studied previously: (i) surface loading attributed to urban construction; (ii) creep occuring in sandy deposits of aquifers. These mechanisms could not fully explain the observed subsidence. Two additional alternative mechanistic models are proposed that involve principles of load transfer considering the temporally and spatially redistributed stresses associated with groundwater extraction: (i) the Cosserat continuum mechanism, considering shear force on the permeable coarse-grained matrial in the aquifer due to hydraulic gradients in the aquifer; and (ii) internal erosion of fine-grained (clay and silt) particles within the aquifer. Initial results based on simulations incorporating Cosserat mechanics look promising.
AB - Alternative subsidence mechanisms related to groundwater extration and surface loading of built infrastructure in Shanghai have been evaluated to explain continued subsidence despite the controlled reduction of groundwater extraction. The traditional theory of aquifer-system compaction embodied in the aquitard drainage model cannot fully explain this phenomenon. Two possible alternative mechanisms were studied previously: (i) surface loading attributed to urban construction; (ii) creep occuring in sandy deposits of aquifers. These mechanisms could not fully explain the observed subsidence. Two additional alternative mechanistic models are proposed that involve principles of load transfer considering the temporally and spatially redistributed stresses associated with groundwater extraction: (i) the Cosserat continuum mechanism, considering shear force on the permeable coarse-grained matrial in the aquifer due to hydraulic gradients in the aquifer; and (ii) internal erosion of fine-grained (clay and silt) particles within the aquifer. Initial results based on simulations incorporating Cosserat mechanics look promising.
UR - http://www.scopus.com/inward/record.url?scp=85041120302&partnerID=8YFLogxK
U2 - 10.5194/piahs-372-13-2015
DO - 10.5194/piahs-372-13-2015
M3 - Conference article
AN - SCOPUS:85041120302
SN - 2199-8981
VL - 372
SP - 13
EP - 15
JO - Proceedings of the International Association of Hydrological Sciences
JF - Proceedings of the International Association of Hydrological Sciences
T2 - 9th International Symposium on Land Subsidence, NISOLS 2015
Y2 - 15 November 2015 through 19 November 2015
ER -