ABSTRACT:

To plan any kind of prevention work in an active landslide, it is necessary to obtain enough information about the condition of ground water in moving masses and bedrock. Measurement of temperature of spring-water and wells in landslide area show that the variation of temperature of ground water in winter and summer is negligible and it is comparatively stable. However, the temperature of ground surface at one-meter depth is not stable. This variation can be due to the non-uniform distribution of ground water. Based on this fact, it is possible to detect the vein-stream of ground water in displaced masses by measuring one-meter depth temperature (Takeuchi, 1980). In this method of investigation, the temperature of one-meter depth on a net work of landslide area is measured; then, the map of isothermal contour lines of one-meter depth temperature will be prepared. This map can be used to interpret the position of ground water and vein-streams in landslide masses This method was used in a large-scale reactivated landslide in Akha area located in Alborz Range, northern Tehran, Iran. The basics of the method and its application in a real landslide are reported in this paper.

INTRODUCTION

It is well recognized that the topography of the surface of underground water does not follow the topography of ground surface. Measurement of temperature of spring-water and wells in landslide area shows that the variation of temperature of ground water in winter and summer is negligible and it is comparatively stable, however, it is found that the annual variation of temperature at one-meter depth is appreciable in landslide masses. This variation could be due to the non-uniform distribution of ground water. Based on this fact, it is possible to detect the vein-streams of ground water in displaced masses by measuring one-meter depth temperature (Takeuchi, 1980).

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