Mongolian Forest Fires Influence to Gegrated Permafrost with Global Warming and Effects on Heat Pipe Control

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We investigated serious disaster of 1996' forest fires and nearby the undistributed forest underlying permafrost, with three cooperators, Mongolian Scientific Academy. The soil, vegetation and topography were investigated and the soil cores were sampled from both sites. The heat pipe was varied in the sampling soil profiles to the depth of 170cm in order to freeze the ground using winter coldness. Next year we succeeded to collect the data of temperature from potable recorder at three places. It found that heat pipe operated to freeze the ground in the very low temperature in winter, but frozen soil was all thawed till the third decade of June. The permafrost was not maintained until the last of June except the deep depth under the heat pipe. This reason was seemed to be lack of soil moisture. In final year of 2001, the results showed a similar tendency from the measured temperature. From the two years' data, it is important to gather the soil moisture in the ground using the liter from trees and another vegetations If the chemical polymer like water absorbent is used for the surface soil, the effect of heat pipe is expected to be maximum for the control of ground freezing all over the years. Also, the frozen ground may be expanded from the position beneath the heat pipe from the two years' data.