mango

Dear Duncan, Thanks for you reply. I followed the email link under your profile, however, I can neither post pictures nor add attached files. So I sent an email to waspsupport(at)risoe.dtu.dk. I don't know whether it works or not. Kindly could you provide your email privately, so I can contact you directly? my email is dengsecon(at)gmail.com. regards! Caplinav Jer

I have another question, what about the significant roughness change criteria? I have two editions of roughness map, one is the data from *.map data, the other is some data of roughness rose. I want to merge the two source data to one. I set the roughness change criteria to: z1 > 2*z0 or z1 < z0/2, the z0 is the previous roughness length and the z1 is roughness being considered. but the result is not good. thanks in advance. Caplinav Jer

Dear Qiangbing, thanks very much for your help. Now I get it right.

thanks a lot for your reply.

Dear Wasp team and users: I have encountered a problem that the roughness speedup is lower, however, the power density is higher. the project area is located at an inter-tidal zone, where I set the roughness length from offshore to land, 0 m, 0.001 m, 0.05 m, respectively. the elevation is the same, so the orography speedup is the same in any area and any sectors. there is no obstacle. the wrg results showed that, although the roughness speedup of inter-tidal area is smaller than that in the ocean, the power density of the inter-tidal area is bigger than that in the ocean. (I can't post figures here, so I list one sector data below) sector 4(90 degree) ============================================================ land inter-tidal sea ============================================================ roughness-length (m) 0.05 0.001 0 roughness speedup -4.2% -0.65% 0.00 power density (W/m2) 205 365 271 ============================================================ here, the inter-tidal power density is the highest of the 3 areas. I think the roughness speedup is reasonable, however, the power density is probably wrong. could anybody give me some help? regards! Caplinav Jer

Dear Qiangbing, I calculated a roughness survey by adding a reference site. in one sector, the roughness change data is: Zone z0 start 1 0.101 0 2 0.244 4406 3 0.105 18648 so , according to your answer, the roughness reference can be calculated as the sum of the integral of: (ln(z0 * exp( - r/R))* dr, r's range is [r1, r2], R = 10000, and the maximum radius is 20000; and then calculate the average of the above and the exponential of the mean. by this way, my results is: 0.07, which is smaller than the results from wasp: 0.156. I want to know how does the roughness reference influence the speedup by roughness. so kindly could you point out where lies the difference? thanks in advance. Caplinav Jer

I have never use the Library at the left-down corner. Usually the power curves or other files are in accordance with the projects.

Dear Wasp Team, I am mow doing some research on how the roughness influences the wind resource analysis result. I carefully setup the roughness line in the *.map file, and built the project to calculate the wind. I noted that the roughness survey showed in the reference site is more simple than what I setuped in the *.map file. I wonder how does the wasp calculate the roughness survey from the *.map file? thanks in advance. Caplinav Jer