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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: GISList: wave exposure calculations |
| Date: |
08/29/2002 04:03:50 PM |
| From: |
Viktoras Didziulis |
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Dear Bill,
Thank you very much for the information you sent. Actualy I think to
evaluate wave exposure with Baarseth index. This is more or less similar to
what I have red in your reply.
Also there was a comparative research of wave exposure (as an effective
fetch (complex calculations) and Baarseth index (relatively simple))
influence to Fucus vesiculosus fields. The result was that in most cases (in
the Baltic sea nearby Finland) correlation between these two exposure
estimates is around 0.98 (p<0.05). So it makes sense calculating Barseth
index as it is less complex...
The most interesting and still unsolved problem (for us) is calculating
Baarseth index for different depths and relief types. There were some
theorethical formulas, but coleagues divers checked them and proved that
they are practicaly unusable in a real world....
Best regards
Viktoras
>From: Quantitative Decisions <whuber@quantdec.com>
>To: "Viktoras Didziulis" <firekv@hotmail.com>
>Subject: Re: GISList: wave exposure calculations
>Date: Thu, 29 Aug 2002 09:39:35 -0400
>
>Dear Viktoras,
>At 11:01 AM 8/29/02 +0300, you wrote:
>>We wrote a script for Arc View to calculate effective fetch values for a
>>raster map of depths also taking into account prevailing wind directions,
>>etc. Well, it took 8 hours on our Pentium III computer to produce a
>>relatively small (around 1000x 1000) 2D raster map. As we are not
>>satisfied with such a "speed", we are rewriting the algorithm as a
>>stand-alone web based application. I would be interested in any open
>>source algorithms for routine wave exposure/effective fetch calculations
>>(if there are any). Thank's again for any information.
>
>I am appending a collection of messages that might be of some help. They
>outline a technique that I believe can be used to calculate fetch in a
>matter of minutes with ArcView. Everything can be prototyped with Map
>Calculator expressions.
>
>--Bill Huber
>
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