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題名 | 分層分區地層下陷模式=Layered and Regional Land Subsidence Model |
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作者 | 蔡東霖; 吳俊賢; 黃良雄; 楊錦釧; | 書刊名 | 中國土木水利工程學刊 |
卷期 | 10:4 1998.12[民87.12] |
頁次 | 頁617-626 |
分類號 | 441.103 |
關鍵詞 | 一維沉陷; 擬三維水流; 垂直分層積分; 水平分區拆解; One dimensional subsidence; Quasi-three dimensional flow; Vertical layered integration; Horizontal domain decomposition; |
語文 | 中文(Chinese) |
中文摘要 | 本研究採用有限解析法發展以一維沉陷理論,配合擬三維垂直深度積分飽和水流 控制方程式概念之地層下陷模式,並實際模擬雲林地區之地層下陷。模擬時依土壤之性質將 整個模擬區域做垂直方向分層與水平方向分區之處理。研究中水平分成數區,每區中再分為 若干層,計算時層與層之間、區與區之間再以適當之物理連接條件連接,使其構成一適當之 問題。 實際模擬時間選擇從民國 84 年元月至民國 85 年 4 月共計 1 年 4 個月的時間。 模式中所需之地層厚度資料、地下水水位資料、抽水量資料的處理都與地理資訊系統相互配 合,並提供數值計算時使用。模擬之結果顯示已大致可反應出雲林地區相對沉陷嚴重之區域 ,但由於在地質參數、井位、抽水量、地下水水位觀測值之不確定以及假設土壤為簡單彈性 體等情況下,使得計算結果仍與實測結果有一些差異。 |
英文摘要 | A land subsidence model based on the concept of one dimensional land subsidence with quasi-three dimensional ground water flow is developed and solved using a finite analytic method. The model is applied to simulating the real land subsidence in Yuin Lin area. The domain considered is divided according to the properties of soils into vertical layers and horizontal regions that are connected by proper physical conditions. The duration of the land subsidence considered is from January, 1995 to April, 1996. All the input data, such as the layer thickness of soils, groundwater surface elevation, and pumping discharge of wells, are provided by the geographysical information system. Severe land subsidence area was correctly predicted using the present method. However, due to uncertainty of the physical parameters involved and over simplification of the soil properties, some deviations can still be observed between the theoretical results and the real measurements. |
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