| 초록 |
Since 1953, when Dr. Hiroshi KOIDE proposed the notion of 'immunity' against the disasters (landslides, slope failures, debris flows, etc.) in mountainous areas, the notion has broadly accepted in the fields of applied geology, debris control works etc. However, this term has been used without due adequate consideration for what it really means. This paper is threefold: first of all, it will be clarified that the validity of the 'immunity' completely depending on how much debris and/or water etc. are in the reservoir site that may fill valleys or slopes. Secondary, it will be suggested that the length of a period of the immunity is determined by both the quantity of stored debris etc. in the reservoir and the size of it. Finally, it will be shown that the resistant to the 'immunity' should be discussed after defining the length of a time scale. |
