台北盆地松山層土壤性質之空間分析; Spatial Analysis of Soil Properties in Songshan Formation, Taipei Basin

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题名:	台北盆地松山層土壤性質之空間分析;Spatial Analysis of Soil Properties in Songshan Formation, Taipei Basin
作者:	黃慈銘;Chiu-Ming Huang
贡献者:	應用地質研究所
关键词:	克力金法;聯合克力金法;空間分析;半變異圖;kriging;cokriging;spatial analysis;semivariogram
日期:	2000-07-18
上传时间:	2009-09-22 09:57:48 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本研究增補若干剪力波速資料加入已建置之台北盆地地下地質資料庫中。並自資料庫中篩選松山層內各深度區間之土壤一般物理性質等資料，利用地質統計學方法進行空間結構分析，並使用克力金法及聯合克力金法進行空間資料推估，以了解各項土壤性質在空間上的分布及其變異性，提供工程規劃施工參考之用。針對從資料庫中所篩選之松山層各深度區間土壤性質資料進行半變異圖分析後，顯示多數土壤性質具有良好之空間變異關係。即可利用此空間變異關係以克力金法與聯合克力金法進行空間推估，得到盆地內各項土壤性質之規格網格式推估值與對應之推估誤差，並繪製等值圖展示，以了解台北盆地松山層土壤性質之空間分布情形。整體而言，在深度40公尺內，盆地東部及北部基隆河流域一帶細顆粒含量較高；盆地南部新店溪及西南部大漢溪流域一帶砂土與礫石含量較高。泥質沈積物密度分布趨勢與N值相近，密度低區多為細顆粒含量較高區域﹔砂質沈積物N值與密度於大漢溪、新店溪流域一帶偏高。含水量大小與密度則呈現相反趨勢，沈積物含水量較高地區為密度較低地區，液性限度及塑性指數與泥質沈積物含水量分布趨勢相近，基隆河及北投一帶有較高液性限度與塑性限度。基隆河流域與北投、關渡一帶呈現較低剪力波速，而大漢溪流域與新店溪流域一帶則呈現較高剪力波速值。利用N值與剪力波速的高相關性，以N值為輔助變數進行聯合克力金法推估可得較合理之剪力波速值，且其推估誤差較克力金法所得為小。 In this study, we collect and incorporat shear wave velocity data into the subsurface geology database of the Taipei Basin which was built by previous workers. We select both physical properties and shear wave velocity data in several depth intervals of Songshan Formation from the database, and perform structure analysis of the spatial data by geostatistical method. Spatial distribution and variation of soil property were calculated by kriging and cokriging methods. The results can be applied to engineering application. Results from semivariograms analysis shows that most soil properties behave good spatial relations. Thus we could use those relations for interpolation of regular grid, and for estimations of errors of soil properties by kriging and cokriging methods. Contour maps are used to demonstrate the distribution of soil properties. Generally speaking, proportions of fine grain content are higher in northern (the area near the Keelung River) and eastern part of the Basin. Meanwhile, proportions of coarse grain content are higher in southern part (the areas near the Tahan River and the Shintien River ) of the Basin. Areas of higher unit weight usually coincide with those have lower proportions of fine sediments. SPT-N values and unit weight of sand sediments are higher at the areas near the Tahan River and the Shintien River. The trend of water content is opposite to the trend of unit weight, whereas the distributions of liquid limit and plasticity index are similar to water content of fine sediments. Liquid limit and plasticity index are high at the area near the Keelung River and Peitou. Shear wave velocity is lower at the areas near the Keelung River, Kuandu, and Peitou, but are higher at the areas near the Tahan River and the Shintien River. Since there exists high relation between SPT-N values and shear wave velocity, we can employ SPT-N values as auxiliary variable to obtain better estimations of shear wave velocity by cokriging. Errors of estimation are reduced as compare to those estimations by kriging.
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