Výpočet diagnostických nárazů větru za použití turbulentní kinetické energie
| Thesis title in Czech: | Výpočet diagnostických nárazů větru za použití turbulentní kinetické energie |
|---|---|
| Thesis title in English: | Model gust wind diagnostics using turbulent kinetic energy |
| Academic year of topic announcement: | 2007/2008 |
| Thesis type: | diploma thesis |
| Thesis language: | |
| Department: | Department of Atmospheric Physics (32-KFA) |
| Supervisor: | RNDr. Filip Váňa, Ph.D. |
| Author: | |
| Advisors: | RNDr. Radmila Brožková, CSc. |
| Guidelines |
| Seznámit se s parametrizacemi turbulentních procesů v numerických předpovědních modelech a s metodami výpočtů nárazů větru.
Seznámit se se současným přístupem používaným v modelu ALADIN. Navrhnout novou metodu výpočtu nárazů větru. |
| References |
| Podle pokynů školitele. |
| Preliminary scope of work in English |
| Correct prediction of wind gusts is an important target for the current NWP models. The current ALADIN model computation of this quantity is based on superposition of the actual wind at screening level and its maximum possible enhancement caused by turbulent eddies diagnosed at every time step. Having now the turbulent kinetic energy (TKE) as prognostic quantity of the model, it is desirable to adapt the formula for wind gust in the way that maximum wind enhancement by eddies would be directly derived from TKE.
Moreover for the practical reasons it seems to be wise to produce cumulative maximum of wind gusts over certain period rather than the its presently used instant value related to the time of model output. Knowing that model outputs are created with lower frequency than is the typical time period of turbulent eddies the cumulative values should offer more representative information for practical (forecasting) purposes over the entire period. Main aim of this diploma work should be to improve the current ALADIN model computation of wind gust by use of the prognostic TKE. |