Abstract
Temporary dams can be formed by the sudden injection of debris flow into main stream for some favorable geomorphologic and hydraulic conditions, which would result in extensive inundations upstream and catastrophic floods downstream due to dam breach and consequently dramatic changes of channel and valley. Expeditious means of assessing potential of dam-forming are necessary, particularly in geological active regions. The complete blockages or dam-forming significantly relate to the discharge ratio and velocity ratio between tributary and main stream, bulk density of debris flow, confluent angles and evenness degree of grain sizes.
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