USE OF SURFACE GEOPHYSICAL TECHNIQUES TO LOCATE A KARST CONDUIT IN THE CANE RUN

使用地面地球物理技术定位肯塔基州皇家泉盆地坎恩河中的喀斯特管道

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2009

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G. N. Tripathi

利用地表地球物理技术定位凯恩皇家温泉盆地的岩溶管道，肯塔基州岩溶地区的地下水流很难绘制，因为它可以通过管道集中，不一定与地表特征一致。我们应用电阻率（ER）和自电位（SP）技术在三个地点找到一个推断的主干管道喂养一个主要的春天在肯塔基州的内蓝草地区。皇家泉是乔治敦市的主要供水水源;其盆地的上部与凯恩润分水岭重合。ER和SP配置文件是垂直的推断干导管的方向。ER分布（972米总长度）使用偶极-偶极电极配置与2至3米的间距进行测量。SP测量沿着这些ER线沿着和一个额外的测试剖面（230米）使用一个固定的参考电极和另一个巡回电极在固定的间隔。与石灰岩基岩的高背景电阻率相比，管道中水的低电阻率是ER勘探的目标。一个负的SP异常对应于一个低ER异常的大多数配置文件，但少数是不可比的。在几个月的时间内测得的七个SP配置文件中有五个被认为是可重复的。虽然不同时期的最终SP剖面的总体趋势相似，但SP幅度随降水量和平均土壤温度而变化。2D反演剖面中的低电阻率异常和相应的SP负异常可能是充水管道，尽管钻探过程中遇到的充满泥浆的空隙表明这些可能是支流管道而不是主干管道。Ganesh N Tripathi 2009年7月24日

OF THESIS USE OF SURFACE GEOPHYSICAL TECHNIQUES TO LOCATE A KARST CONDUIT IN THE CANE RUN ROYAL SPRING BASIN, KENTUCKY Groundwater flow in karst terrains is difficult to map because it can be concentrated through conduits that do not necessarily coincide with the surface features. We applied electrical resistivity (ER) and self-potential (SP) techniques at three sites to locate an inferred trunk conduit feeding a major spring in the Inner Bluegrass region of Kentucky. Royal Spring is the primary water supply for the city of Georgetown; the upper part of its basin coincides with the Cane Run watershed. ER and SP profiles were perpendicular to the inferred trunk conduit orientation. ER profiles (972 m total length) were measured using a dipole–dipole electrode configuration with 2to 3-m spacing. SP measurements were taken along those ER lines and an additional test profile (230 m) using one stationary reference electrode and another roving electrode at a fixed interval. The low resistivity of water in the conduit, as compared to the high background resistivity of limestone bedrock, is the ER exploration target. A negative SP anomaly corresponds to a low ER anomaly for most of the profiles, but a few are not comparable. Five of seven SP profiles measured over a period of several months were found to be reproducible. Although the overall trends of the final SP profiles for different dates were similar, the SP magnitudes varied with the amount of precipitation and the average soil temperature. The low-resistivity anomalies in the 2D inverted sections and corresponding negative SP anomalies could be water-filled conduits, although mud-filled voids encountered during drilling suggest that these may be tributary conduits rather than the trunk conduit. Ganesh N. Tripathi July 24, 2009

USE OF SURFACE GEOPHYSICAL TECHNIQUES TO LOCATE A KARST CONDUIT IN THE CANE RUN - ROYAL SPRING BASIN, KENTUCKY

使用地面地球物理技术定位肯塔基州皇家泉盆地坎恩河中的喀斯特管道

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