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Le Provost database blanks


geraldine
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Hi,

Le Provost database assigns constituents' Amplitude and Phase for only half of nodes in my ADCIRC model:

Node Amplitude Phase

1 0.0 0.0

2 0.0 0.0

3 0.0 0.0

4 0.0 0.0

5 0.6134189897366 338.01270227719

6 0.6133770631197 338.01837342088

7 0.6134028768554 338.01488157507

8 0.6134920359235 338.00282558166

The date and the number of nodes doesn't matter... I'm in Geographic coordinates (WGS84)

What did I do wrong???

Geraldine

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The Le Provost data base assigns tidal data to nodestrings with the "open ocean" type specified. It also only gives values in wet cells and because it is coarse may miss values close to the shore that are shallow. It is recommended that you place ocean boundaries in deep ocean far away from your area of interest.

I would make sure:

1. That the correct nodestrings are marked as ocean.

2. That the ocean nodestrings do not overlap land cells.

One work around would be to copy the values from the first or last (whichever is closest) reasonable value to the invalid values nearby.

I hope this helps.

Hi,

Le Provost database assigns constituents' Amplitude and Phase for only half of nodes in my ADCIRC model:

Node Amplitude Phase

1 0.0 0.0

2 0.0 0.0

3 0.0 0.0

4 0.0 0.0

5 0.6134189897366 338.01270227719

6 0.6133770631197 338.01837342088

7 0.6134028768554 338.01488157507

8 0.6134920359235 338.00282558166

The date and the number of nodes doesn't matter... I'm in Geographic coordinates (WGS84)

What did I do wrong???

Geraldine

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Thanks Rusty,

my problem is certainly due to shallow water... I tried to copy some reasonable value, but it actually is a very awkward task because it often seems to lead to 'Warning Water Surface Elevation' during the calculations ^^

One possible solution seems to be replacing my semi-circular ocean boundary by a simple straight line... I hope this won't affect my model in another way!

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I think you are better off using the semi-circular boundary but have a land boundary out to where your good values start or have enough depth that they won't give you a warning that forced nodes become dry. Having a land boundary where you will sometimes have water won't affect your results too much if you are keeping your boundary condition far from your area of interest which is always a good idea.

Thanks Rusty,

my problem is certainly due to shallow water... I tried to copy some reasonable value, but it actually is a very awkward task because it often seems to lead to 'Warning Water Surface Elevation' during the calculations ^^

One possible solution seems to be replacing my semi-circular ocean boundary by a simple straight line... I hope this won't affect my model in another way!

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Exactly. You may want to alter these areas so they don't form sharp corners also. Keep these far out and the unrealistic setup in these areas won't affect the important areas of your model.

So, if I understand what you mean, I should extend manually my land boundary to include very shallow water in it, and so keep only areas with enough depth to build my ocean boundary...?

I will try to do that and I will let you know if some problems still remain!

Thanks again,

Geraldine

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