The effect of clay dehydration on land subsidence in the Yun-Lin coastal area, Taiwan |
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| Authors: | C-W Liu W-S Lin C Shang S-H Liu |
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| Institution: | (1) Department of Agricultural Engineering, National Taiwan University, Taipei, Taiwan, ROC e-mail: lcw@gwater.agec.ntu.edu.tw Tel.: +886-2-23628067 Fax: +886-2-23639557, TW;(2) Department of Agricultural Engineering, National Taiwan University, Taipei, Taiwan, ROC; Water Resources Bureau, Ministry of Economic Affairs, Taipei, Taiwan, ROC, TW |
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| Abstract: | The smectite dehydration theory developed by Ransom and Helgeson was applied for simulation of land subsidence in the Yun-Lin
coastal area, Taiwan. The volumetric reduction of smectite clay at equilibrium state was computed by assuming that the dehydration
of interlayer water in smectite clay can be described with a regular solid solution reaction. By using the in situ stratigraphic
data collected from the subsidence monitoring wells in the simulated area, the amounts of land subsidence caused by smectite
dehydration in three scenarios with pressure variation were calculated. The results indicate that significant amounts of land
subsidence can be attributed to smectite dehydration. This finding reveals that smectite dehydration is of importance for
assessment and prediction of land subsidence. Additionally, the results also indicate the overburden weight has a larger effect
on clay dehydration than the effective stress change resulting from over-pumping, although both of them induce relatively
minor variations on land subsidence.
Received: 23 February 2000 · Accepted: 23 March 2000 |
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| Keywords: | Dehydration Groundwater Interlayer water Land subsidence |
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