Dear everyone,

I want to simulate tidal propagation at my domain that has three open boundaries. I want to use water level boundary for north boundary and Neumann BC for the west and east boundary. But I don't know how to specify the gradient of waterlevel. I have tried to set the gradient time series as 0, but in cophase plot, it doesn't show propagation. Would you please give some advice and may be the example of calculation Neumann BC based on offshore forcing. Thanks a lot.