About the OpenTNSim-Locking module

The OpenTNSim-Energy module simulates vessels passing through locks. The method can be used to analyse traffic flows, lock capacity and potential congestion. But it can also be used to simulate salt intrusion/fresh water losses. As such the tool is a great instrument for the functional design of locks.

Key element to the OpenTNSim approach is to quantify the duration of various discrete events that are part of the locking process. Think of:

• approaching the lock at cruising speed

• slowing down to full stop and mooring in the waiting area

• waiting in lay-by until the lock can be entered

• entering the lock chamber and door closing

• water level adjustment in the lock chamber

• door opening and leaving the lock chamber

• continuing the journey at cruising speed

The figure below shows a typical time-distance diagram that is used for locking.

For more information on the functional design of locks, visit Part III - Chapter 3 of the Ports and Waterways lecture notes.