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

蒙古森林火灾对全球变暖的聚集性永久冻土的影响及其对热管控制的影响

基本信息

批准号：
11691168
负责人：
TSUCHIYA Fujio
金额：
$ 3.84万
依托单位：
Obihiro University of Agriculture and Veterinary Medicine
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11691168/
关键词：
Permafrost Heat Pipe Forest Fire Mongolia Ground Freezing Fire Weed Global Warming

项目摘要

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.

我们与蒙古科学院三个合作方调查了1996年的森林火灾及附近未分布的多年冻土下森林。研究了两个地点的土壤、植被和地形，并采集了土壤岩心。在采样土壤剖面中，热管的深度可达170cm，目的是利用冬季的寒冷来冻结土壤。第二年，我们成功地在三个地方用便携式记录仪收集了温度数据。研究发现，在冬季，热管在极低的温度下冻结地面，但冻土直到6月的第三个十年才全部解冻。直到六月底，除了热管下面的深度外，永久冻土层没有得到维持。这个原因似乎是土壤缺乏水分。2001年末的实测温度也显示出类似的趋势。从这两年的数据来看，利用树木和其他植被的升水来收集地下的土壤水分是很重要的，如果在表层土壤中使用吸水性等化学聚合物，热管的效果有望在历年控制地面冻结方面达到最大。另外，从这两年的数据来看，冻土可以从热管下的位置扩展。