Origin of AWAC's .wad file data

Up to Waves

Origin of AWAC's .wad file data

Posted by Pedro J. C. Ribeiro at October 12. 2010

Hello

 

I've been collecting wave data as part of a long contract with a major oil company. As I'm asked to deliver the raw data to the client, I'm also asked to describe it for them . With this in mind, I'd like to know how are the full directional spectra presented in AWAC's .wad files constructed. I know that this data is not corrected for wave attenuation with depth, still I'd like to know if the spectra are based on data from AST, pressure or velocity. 

If I introduce  correction for depth attenuation, can I use this spectra to generate wave parameters without using STORM?

Currently I´ve been using Lee Gordon's routines, which uses the PUV method, and obtaining results pretty close to STORM's, but I´m left without the full directional spectra to deliver to my client.

PS: The reason why we're not using STORM is that, as part of the contract, I have to describe the algorithms used on all calculations made from the raw data.

Thanks,

Pedro

Re: Origin of AWAC's .wad file data

Posted by Jonas Røstad at October 13. 2010

Hi Pedro,

 

Isn't the .wad the raw non-processed wave data file?

Storm produces quite some files, the full directional spectra file is .wds.

It also gives out the format of the files in the .whr file including the following

 

Processing configuration
---------------------------------------------------------------------
PdWaveBase Version                    3.29
Processing Method                     MLM-AST
Wave Coordinate System                BEAM
Spectrum Selected                     Depth Optimized
Wave Direction                        From
Beams Included                        1 2 3 4
Number of Bins for Smoothing          64
Start Frequency                       0.02
End Frequency                         0.49
Start Frequency AST                   0.02
End Frequency AST                     0.99
Frequency Step                        0.01
Mounting Height                       0.50
Directional Offset                    0.00
Pressure Offset                       0.00

 

I am not sure if I understood and answered your question. If not please clarify.

 

Best regards

Jonas Røstad

Re: Origin of AWAC's .wad file data

Posted by Pedro J. C. Ribeiro at October 13. 2010

Hi Jonas,

 

Thanks for your reply, I'm sorry I really made some confusion with the files. I was referring to the .wds file. I need to know how is this file created, if it uses data from pressure sensor, velocity, or AST, and if can use it to generate wave parameters after correcting for depth attenuation.

Thanks,

Pedro

 

 

Previously Jonas Røstad wrote:

Hi Pedro,

 

Isn't the .wad the raw non-processed wave data file?

Storm produces quite some files, the full directional spectra file is .wds.

It also gives out the format of the files in the .whr file including the following

 

Processing configuration
---------------------------------------------------------------------
PdWaveBase Version                    3.29
Processing Method                     MLM-AST
Wave Coordinate System                BEAM
Spectrum Selected                     Depth Optimized
Wave Direction                        From
Beams Included                        1 2 3 4
Number of Bins for Smoothing          64
Start Frequency                       0.02
End Frequency                         0.49
Start Frequency AST                   0.02
End Frequency AST                     0.99
Frequency Step                        0.01
Mounting Height                       0.50
Directional Offset                    0.00
Pressure Offset                       0.00

 

I am not sure if I understood and answered your question. If not please clarify.

 

Best regards

Jonas Røstad

 

Re: Origin of AWAC's .wad file data

Posted by Jonas Røstad at October 15. 2010

Dear Pedro,

I thought the attached Processing configuration answered your question. The type of method used is user selectable when processing the data. If I don't answer your question please clarify your request.

Best regards

Jonas

 

 

 

Processing configuration
---------------------------------------------------------------------
PdWaveBase Version                    3.29
Processing Method                     MLM-AST
Wave Coordinate System                BEAM
Spectrum Selected                     Depth Optimized
Wave Direction                        From
Beams Included                        1 2 3 4
Number of Bins for Smoothing          64
Start Frequency                       0.02
End Frequency                         0.49
Start Frequency AST                   0.02
End Frequency AST                     0.99
Frequency Step                        0.01
Mounting Height                       0.50
Directional Offset                    0.00
Pressure Offset                       0.00

Re: Origin of AWAC's .wad file data

Posted by Pedro J. C. Ribeiro at October 16. 2010

Hi Jonas

 

I´m getting the .wad files from AWAC AST Software, on Deployment/Data Conversion option. On this software I'm not able to choose a processing method, it does everything by itself. I've been using STORM version 1.07, and couldn't find the option to export .wad files, I can only export .dat files for the data showing in the screen.

Thanks a lot,

Pedro

 

Re: Origin of AWAC's .wad file data

Posted by Jonas Røstad at October 18. 2010

Dear Pedro,

 

The .wad from the AWAC AST is the un-processed wave data file. Of that reason you will not have the option to choose processing method.

Storm is not exporting un-processed data as the .wad only processed data. The .whr file is telling you both the content, format and processing method used for these files.

I am sorry if I don't answer your questions, please help me understand the request by clarifying.

Best regards

Jonas

 

 

Re: Origin of AWAC's .wad file data

Posted by yolo at April 15. 2019

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yolo

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