IMHE OpenIR  > 成都山地所知识仓储(2009年以前)
JAPAN-CHINA JOINT RESEARCH ON THE PREVENTION FROM DERIS FLOW HAZARDS
Language英语
Disaster Prevention Rcsearch Institue, Kyoto University; Institute of Mountain Hazards and Environment, Chinese Academy of Science, and Ministry of Water Conservancy;
1994-03
PublisherDisaster Prevention Reserch Instiue, Kyoto Univesrity
Publication PlaceKyoto
Abstract

Recent major natural disaster which claims human lives in Japan and China is due to debris flows, and therefore, establishment of some systems to cope with such disaster is an urgent need for both countries. The existing knowledges of the fundamental mechanics of debris flow are, however, not sufficient for either to design the structural countermeasures or to set the non-structural systerns because there are wíde varieties in the  characteristics of the debris flows depending on the basin and the rainfall conditions.

Many Japanese debris flows are of the stony inertial types and the mechanical models to describe such debris flows have been extensively developed. ln China almost all types of debris flows occur reflecting its variety in the geological and geographical conditions and research on the muddy viscous type debris flows among others has been intensively developed. The stony type and the viscous type debris flows constitute two major groups of debris flows.

N amely, the front part of the stony debris flow is mainly comprised of big boulders and stones and the depth of the flow may be at most a few ten times of the mean diameter. It often stops even in a steep gully and generally by running out to a place flatter than 4 or 3 degree it ceases the motion. The viscous debris flow, on the other hand, rather highly contaÏns very fine materials such as clay and silt and the dominant coarse particles are less than a few ten centimeters in diameter. Accumulation of big particles in the front part is not conspicuous and sometimes it is highly turbulent. The rear part is, however, laminar with very smooth surface. It is sometimes able to flow in a fantastic speed even in the gully having the slope gradient flatter than 3 degree. The occurrence conditions and
the methods to cope with those debris flows should be also different from each other.


The actual debris flows may occur having the wide spectrum of charaderistics between those two typical debris flows. Therefore, we need to develop the unified viable understandings of the debris flows as a base to construct the society free from the debris flow hazards. To this context, the joint research among the two countries is indispensable and in good tirning for the promotion of universal understandings of the debris flows.

Necessity of the joint reseach was discussed between Takahashi and Wu and each applied the research fund to the respectíve suitable organizations. Fortunately, the application to the Japan Ministry of Education, Science and Culture was approved as one of the Monbusho Internation Scientific Research Program: Joint Research to be continuted for three years from 1991 to 1993 (No. 03044085). The Chinese side applied to Chinese Academy of Sciences and the National Scientific Foundation and those funds were partly used for the joint research project. Therefore, thanks are due to those who are concerned with the funds in both countries and many cooperators who helped accomplishment of this research.

Pages195
Document Type专著
Identifierhttp://ir.imde.ac.cn/handle/131551/8433
Collection成都山地所知识仓储(2009年以前)
Recommended Citation
GB/T 7714
Disaster Prevention Rcsearch Institue, Kyoto University,Institute of Mountain Hazards and Environment, Chinese Academy of Science, and Ministry of Water Conservancy;. JAPAN-CHINA JOINT RESEARCH ON THE PREVENTION FROM DERIS FLOW HAZARDS[M]. Kyoto:Disaster Prevention Reserch Instiue, Kyoto Univesrity,1994.
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