Proposal of Hazard Connectivity Index for debris flow disaster management

The concept of connectivity and its index have been widely discussed applied to environmental studies such as ecology, hydrology, geomorphology hydrosedimentology. Supposing that this is very useful also in disaster risk management, we define the hazard associated debris flows degree between flow occurrence (trajectory) point interest (location house, person, so on). Based on definition, Hazard Connectivity Index (HCI) proposed as: HCI = L/(x+L), where x shortest distance trajectory interest; L runout or just mass movement. value varies from 0 1, being higher indicates larger condition. application one case study showed it can be analysis related hazard.