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Modeling a coastal lagoon


motasurfing
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Hi,

I will make a set of simulations of a coastal lagoon, and I have as input data only measurements of tide in three sites of the area (see figure), speed and magnitude of currents only in the outer zone (not in the mouth, but farther) and wind. I will place the signal measured outside the area like a boundary condition, I mean that will be the beginning of my mesh, but the other two tidal signals will be IN my mesh, not in the border, my questions are: How can I include in the simulation the other two signals? and what kind of BC can I use at the end of my mesh, in the upper side of the lagoon, if I only have pressure measurements and in a place located before the end of my mesh?

Watch the figure!!!bat.bmp

Thanks in advance.

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Hi,

If possible, I would have the mesh end pretty close to your furthest out measurements. You might could have a boundary that is curved in this area. I would then create a model using this boundary condition. Then I would compare the model results with the measured results at the other locations (b and c). This will give you an idea of how well your model represents reality (calibration). Having additional data within your model to do this kind of analysis is useful in fact more than that it is important.

Hi,

I will make a set of simulations of a coastal lagoon, and I have as input data only measurements of tide in three sites of the area (see figure), speed and magnitude of currents only in the outer zone (not in the mouth, but farther) and wind. I will place the signal measured outside the area like a boundary condition, I mean that will be the beginning of my mesh, but the other two tidal signals will be IN my mesh, not in the border, my questions are: How can I include in the simulation the other two signals? and what kind of BC can I use at the end of my mesh, in the upper side of the lagoon, if I only have pressure measurements and in a place located before the end of my mesh?

Watch the figure!!!bat.bmp

Thanks in advance.

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Thanks,

What kind of additional data and where do you recommend?

You say that I could have a curved boundary in the mesh end, pretty close to my furthest out measurements, you mean not attempting to cover the whole estuary, and finalize the mesh at the point of measurement? (please see the figure)

If I do that, can I have a signal tide in two points of my mesh? at the beginning and the end?

Thanks in advance.

post-1448-12756673352_thumb.jpg

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Sorry, I am just saying you could cut your model off at point "A" but cover the whole estuary. You can do tidal elevations at two points, but I wouldn't recommend it in your case.

The additional data I was referring to is the data at points b and c. You don't use them to drive your model but to verify that it gives good answers.

If you cut off your mesh right about at point A, I would put just a slight bend to your boundary condition. I can't say for sure the above would work exactly right. You would have to give it a shot and see how well you match real numbers.

Thanks,

What kind of additional data and where do you recommend?

You say that I could have a curved boundary in the mesh end, pretty close to my furthest out measurements, you mean not attempting to cover the whole estuary, and finalize the mesh at the point of measurement? (please see the figure)

If I do that, can I have a signal tide in two points of my mesh? at the beginning and the end?

Thanks in advance.

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Thanks,

As you can see, I'm new modeling dynamic simulations, I just had done steady state simulations, your help is invaluable, I´m using the software for my thesis. In the boundary conditions type, in the assign boundary conditions dialog box, wich one corresponds to the tide, I mean where the tidal elevations have to be introduced? In RMA2 model control files? in the context that there are no river inflows, so it may not be necessary to run any steady state iterations prior to starting dynamic time steps.

Thanks in advance.

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