Thanks Siddhi Joshi.

That's a good idea. I hope your way I can solve my problem.

2 Methods:

1. You can use the "Structures" in Mike 21 SW, HD (version 2014).

2. You can increase the bathymetric values to the postion of submerged breakwaters

You must set up the value D50 > 20cm for the submerged breakwaters

Thank Van.

1st method, i don't have version 2014. 

2nd one, I will try. But i think it won't stability with big current speed. 

Try it yourself,

I think you can be successful.

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