Abstract: In order to avoid the secondary disasters caused by the traditional emergency measures of drainage and flood discharge, a new method of strong jet impact drainage is put forward, the characteristics and influencing factors of strong jet are analyzed, and the theoretical value of jet impact force is calculated. Through a large number of field tests and data analysis and comparison, it is verified that the strong jet impact drainage technology is used for rapid flushing on the dam body of the barrier lake. It is feasible to form a certain scale of drainage and flood discharge trough. The technology of strong jet impact drainage is of great practical significance for the rapid, effective and safe drainage of the barrier lake and the reduction of casualties and economic losses.

Key words: strong jet, barrier lake, impact drainage, jet impact force, emergency rescue