Characterization of land subsidence in the Choshui River alluvial fan, Taiwan

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• 作者：Chih-Hsi Liu ; Yii-Wen Pan ; Jyh-Jong Liao ; Chen-Tair Huang and Shoung Ouyang
• 关键词：Land subsidence ; Taiwan ; Aquitards ; Aquifers
• 刊名：Environmental Geology
• 出版年：2004
• 出版时间：June 2004
• 年：2004
• 卷：45
• 期：8
• 页码：1154-1166
• 全文大小：875 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0495

文摘

Land subsidence in Taiwan has increased rapidly over the past four decades, owing to heavy withdrawal of groundwater. Leveling surveys, layer compressions and groundwater level in individual layers were continuously monitored in the Choshui alluvial fan, western Taiwan. It was found that ground subsidence and layer compression were consistent with the variation of groundwater level. From multi-level compression monitoring, the layers with major compression deformation were identified. Clayey and sandy layers exhibited significant compression deformation. Conceptual models of compression behavior for clays and sands were studied based on the field data. The compression behavior of clays agreed with the Terzaghi consolidation theory. Notable, irrecoverable volumetric strains were also observed in sandy layers. They exhibited obvious elasto-plastic mechanical behavior. The high compressibility of the sand layer in the alluvial fan was attributed to the flaky sand grains in this geological region.