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## Message Boards

### Delft3d storm surge nesting

CL

#### Delft3d storm surge nesting

Youngling Posts: 5 Join Date: 1/18/16
Hello, I am Korea University Chilwoo Lee

My question is about storm surge simulation

When storm surge simulation using Nesting, When do I need to enter the Cyclone information?

Can you talk to me correct method below the examples?

ex) Layer1 - Tide+Tropical Cyclone

Layer2 - .bct(layer1_nesting)+Tropical cyclone? or .bct(layer1_nesting)

Layer3 - .bct(layer2_nesting)+Tropical cyclone? or .bct(layer2_nesting)

Final Layer - .bct(layer3_nesting)+Tropical cyclone? or .bct(layer3_nesting)

Sincerely Chilwoo

Thank you.

#### RE: Delft3d storm surge nesting

Jedi Council Member Posts: 612 Join Date: 3/2/11
Hi Chilwoo,

I am not sure about your question. But to carry out a storm surge modelling, you may use amp/amu/amv as input, and you may use spiderweb technique. You can nest a flow model with a nesting wave model as well.

So you may have a lot of possible approaches. Pls check the manual first.

Greetings,

Qinghua YE
CL

#### RE: Delft3d storm surge nesting

Youngling Posts: 5 Join Date: 1/18/16
Thanks you.

Qinghua Ye

I will simulate storm surge modelling using Delft3D dashboard.

i calculated wind field in DDB(Tropical cyclone, .spw)

my question is when do i input wind field in Nesting.

Example)

1. Layer1(overall grid) = boundary condition (tidal of TPXO 7.2 model)

2. layer2(nested1 grid) = boundary condition(water level of time series)

3. layer3(nested2 grid) = boundary condition(water level of time series)

4. Final layer (final grid) = boundary condition(water level of time series)

here, when do i input the spiderweb file?

i just using dashboard tropical cyclone tools.

Thank you...

#### RE: Delft3d storm surge nesting

Jedi Council Member Posts: 612 Join Date: 3/2/11
Hi Chilwoo,

If I understand you correctly, you have a nested flow model, with spiderweb input from DDB. Then you may add this spiderweb force to every layer, if you want to a consistent force through the nesting and each nested model.

But still it depends on what you want to achieve.

Regards,

Qinghua
CL

#### RE: Delft3d storm surge nesting

Youngling Posts: 5 Join Date: 1/18/16

I agree your opinion. So, I tried to simulation.

I do the nesting by inputting the typhoon data in each layer.

I progress the nesting, water level is more and more increase.

This result is caused by typhoon data in each layer.(fig.1)

So , I try to simulation the other method.

All layer input only tide. But, last layer input the typhoon.

This result is fig2.((Tide+cyclone)-Tide)

But this result doesn't appeared water level before appearing storm surge.

So what should I do?

Thank you.

figure is send to your email.