Debris Flow Assessment in the Gaizi-Bulunkou Section of Karakoram Highway

Highways frequently run through the flow and accumulation areas of debris gullies thus are susceptible to hazards. Assessing flows along highways can provide references for highway planners control, emergency management. However, existing assessment methods mostly neglect essential information paths spreading at regional scale. Taking Gaizi Village-Bulunkou Township Section (hereinafter referred as “the Gaizi-Bulunkou Section”) Karakoram study area, this research introduces a simple empirical model (the Flow-R model) establishes method assessing hazard level. The main processes include data collection, inventory former events, calculating source probability, verification model, extraction factors, calculation levels. results show that: 1) accuracy, sensitivity, positive predictive power in simulating probability area were 81.87, 70.80 72.70%, respectively. errors mainly occurred fans. 2) make it possible divide levels into four N5, N19, N28 had highest level during period. 3) In highway, period, with very high, medium, low hazards 4.33, 0.62, 1.41, 1.68 km length,