roughness lengh (2004-09-20)

[Old Forum Archivist]

Which value is correct for the roughness lengh of water in wasp?

0.0m or 0.0002m ??
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The roughness of water must be specified as 0 m (zero), in order for WAsP to distinguish between water areas and very smooth land surfaces like snow, sand or bare soil. The wind profiles over water and land are treated differently.



The confusion arises because, internally, WAsP uses a fixed value of 0.0002 m for the roughness of a water surface. However, for the reason given above, the user should specify 0 m for water areas in a WAsP roughness map or roughness rose.



WAsP Team

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