intro story Coast / Estuary

Coast / Estuary

Coastal systems are among the most dynamic physical systems on earth and are subject to a large variety of forces. The morphodynamic changes occurring to coastlines worldwide are of great interest and importance. These changes occur as a result of the erosion of sediments, its subsequent transport as bed load or suspended load, and eventual deposition. 
 
Estuaries are partly enclosed water bodies that have an open connection to the coast. Estuaries generally have one or more branching channels, intertidal mudflats and/or salt marshes. Intertidal areas are of high ecological importance and trap sediments (sands, silts, clays and organic matter).
Within the Delft3D modelling package a large variation of coastal and estuarine physical and chemical processes can be simulated. These include waves, tidal propagation, wind- or wave-induced water level setup, flow induced by salinity or temperature gradients, sand and mud transport, water quality and changing bathymetry (morphology). Delft3D can also be used operationally e.g. storm, surge and algal bloom forecasting. 
 
On this discussion page you can post questions, research discussions or just share your experience about modelling coastal and/or estuarine systems with Delft3D FM. 
 

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Sub groups
D-Flow Flexible Mesh
DELWAQ
Cohesive sediments & muddy systems

 

 

Message Boards

RE: Tropical Cyclone Toolbox

Marjorie Turiano, modified 3 Years ago.

Tropical Cyclone Toolbox

Youngling Posts: 19 Join Date: 1/22/16 Recent Posts
Hi!

I am using Delft Dashboard standalone version 2.01.12629

I have queries regarding the Rmax formulations described in the Tropical Cyclone toolbox. Currently there are three options for Rmax formulation in DDB:
  • Gross (2004)
  • Pagasa-JMA
  • 25 NM


I understand that the 25 NM option will use Rmax = 25 nautical miles. However, I cannot find literature about Gross (2004) and Pagasa-JMA. In the PublicWiki of DelftDashboard, Vickery and Wadhera (2008) was mentioned as one relation for Rmax. Is Vickery and Wadhera (2008) corresponding to Pagasa-JMA in DDB? Also, is there an available detailed documentation of DDB, particularly about the Tropical Cyclone toolbox?


Sincerely,
Marjorie
KN
Kees Nederhoff, modified 3 Years ago.

RE: Tropical Cyclone Toolbox

Youngling Posts: 12 Join Date: 3/3/14 Recent Posts
Hi Marjorie,

More information about Gross (2004) is available here: https://ams.confex.com/ams/pdfpapers/75000.pdf. I don't have a reference for the constant RMW and Pagasa-JMA.

We are currenty working on a paper about Delft Dashboard which will explain more about the "Tropical Cyclone toolbox".

Cheers, Kees
Marjorie Turiano, modified 3 Years ago.

RE: Tropical Cyclone Toolbox

Youngling Posts: 19 Join Date: 1/22/16 Recent Posts
Hi Kees,

Thank you for providing reference for Gross et al (2004). Looking forward to the DDB paper you're working on. Thank you, and cheers.


Sincerely,
Marjorie
Marjorie Turiano, modified 3 Years ago.

RE: Tropical Cyclone Toolbox

Youngling Posts: 19 Join Date: 1/22/16 Recent Posts
Hi,

I have further questions about the wind field generated by Delft Dashboard. I understand that the outputs in the spw are already surface winds (u10), but the equations presented by Holland or Fujita are gradient/geostrophic winds. How are the winds converted from geostrophic winds to surface winds? I cannot seem to find a discussion about this conversion even in the latest WES manual that comes with Delft3D 4.02.03.

I also observed that the latest WES manual makes no mention of wind fields by Holland et al (2010) or Fujita (1952). So Delft Dashboard is using a different WES application than what is distributed with the Delft3D GUI?

Another thing, is there an easy way to output time history of wind speed, direction and MSL pressure at certain observation stations within Dashboard? That will really be useful for comparing modeled wind profiles with observations. At the moment I am doing a "crude" way to generate time history by doing a quick run of FLOW with wind forcing (using spiderweb grid) in a small domain containing my desired observation station, and then extract the wind speed, direction and MSL pressure from the trih output files...

Any help is greatly appreciated.


Sincerely,
Marjorie
KN
Kees Nederhoff, modified 3 Years ago.

RE: Tropical Cyclone Toolbox

Youngling Posts: 12 Join Date: 3/3/14 Recent Posts
Hi Marjorie,

First, Delft Dashboard is using the newest Matlab-based version of WES. If you would to know how this is coded have a look at the function wes3 (URL: OpenEarthTools\matlab\applications\DelftDashBoard\general\tropicalcyclones\wes\wes3.m)

Second, it is possible to create a time series of a spiderweb with the function spw2regular (URL: OpenEarthTools\matlab\applications\DelftDashBoard\general\meteo).

Cheers, Kees
Marjorie Turiano, modified 3 Years ago.

RE: Tropical Cyclone Toolbox

Youngling Posts: 19 Join Date: 1/22/16 Recent Posts
Hi Kees,

Thank you for your response. Your direction to the location of the code is very helpful. I understand the computation of the wind field in DDB now.


Sincerely,
Marjorie
Marjorie Turiano, modified 5 Days ago.

RE: Tropical Cyclone Toolbox

Youngling Posts: 19 Join Date: 1/22/16 Recent Posts
Hello!I have observed that the spiderwebs generated using the Tropical Cyclone Toolbox in the executable version of Delft Dashboard (v02.02.13278) still uses 1013 mb as ambient pressure even if user defined input of ambient pressure is different, say 1010 mb. It significantly affects the resulting pressure field, and its comparison with observed data.