（旧）军事上指利用舟、筏、两栖车辆或门桥渡送人员、车辆和技术兵器过河的方法。
该方法基于势流理论，考虑门桥的漕渡速度和水流速度，通过坐标变换，确定了速度势的适定性条件。
Based on potential flow theory, current velocity and ferrying velocity is considered. Confirmative conditions of the velocity potential are established by means of transforming coordinates.
这些水渠往往要凿通岩石，并需要地道、引水沟、弯管、渡漕和混凝土水道。
These canals are frequently excavated through rock, and require tunnels, flumes, syphons, aqueducts and open concrete-lined channels.
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