The case we have studied is the confluence of two rivers. The next figure describe this confluence with an Y form.
Description of the confluence system.
In our tests, the flows are imposed at the top of each rivers and the water height is imposed at the end of the zone. We made two tests. The first one is quite simple, the value of each flow at the entrance was constant during the simulation and Q1=Q2=cte. During the second test, our aim was to simulate a flood, then the flows at each entrance follow the following graphs:
Indeed, in the two cases, there were a pic of Q1 and Q2, to simulate the flood at the top of each confluent.