應用邊緣偵測法於地電阻試驗結果之地層分界判釋

Application of Edge Detection Methods on Interpretation of Slope Strata from Electrical Resistivity Tomography Outcomes

10.29417/JCSWC.201106_42(2).0005

蕭仲富(Chung-Fu Shiao)；馮正一(Zheng-Yi Feng)

地電阻剖面法 ； 邊緣偵測 ； 地形效應 ； Electrical resistivity tomography ； bedrock edge detection ； topography effect

中華水土保持學報

42卷2期（2011 / 06 / 01）

131 - 139

繁體中文

本研究應用拉氏邊緣偵測法(Laplacian Edge Detection, LED)與基岩邊緣偵測法(Bedrock Edge Detection, BED)於地電阻剖面法(Electrical Resistivity Tomography, ERT)所測得之資料，進行地層分界判釋並探討此兩種方法之成效。本研究亦以地電阻正算模型之數值模擬結果，分析地形效應對地層分界判釋之影響。分析結果發現基岩邊緣偵測法與拉氏邊緣偵測法各有其適用性。本研究以台中縣東勢鎮東勢林場之邊坡進行ERT現地試驗，並配合鑽孔資料以輔助地層分層判釋之準確性。

This study applied the methods of Laplacian Edge Detection (LED) and Bedrock Edge Detection (BED) to Electrical Resistivity Tomography (ERT) data for locating the interfaces of strata. The effectiveness of the two methods was discussed. This study also used numerical forward models of ERT to discuss the influence of the topography effect on locating the interfaces of the strata. The results indicate the BED and LED methods have different suitability for different applications aspects. We performed a field ERT survey at Dong-Shi Forest Farm and the test results were used with the borehole data to increase the interpretation accuracy of the interface locations.