1 / 15

Wind Structure in Stratiform Rainbands over Land

This seminar by Shaunna Donaher discusses the wind structure in stratiform rainbands as they pass over land, specifically focusing on urban coastal environments. Using various observational tools such as W-Band radar, X-Band radar, and wind profilers, the study examines the implications of wind speed on tall buildings. The methodology includes VAD analysis and exponential fitting to evaluate the turbulence and wind profiles. Key results highlight variations in roughness lengths across different terrains, and conclusions suggest future research directions for improved understanding of wind behavior in urban settings.

cicely
Télécharger la présentation

Wind Structure in Stratiform Rainbands over Land

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Wind Structure in Stratiform Rainbands over Land Shaunna Donaher MPO Student Seminar December 1, 2010

  2. UM South Campus/CSTARS Aug-Sept 2008 W-Band radar X-Band radar WSR-88D Wind Profiler (MAPR) Met. Obs Rain gauge array Radiosondes (2-3 /day) Ceilometer Disdrometer Microwave Rain Radar (X-band) Experiment Description Image from maps.google.com CSTARS

  3. Rainband Breakdown

  4. Motivation and Background • Why do we care about the wind structure over land? • Describes conditions in an urban coastal environment as rainband passes over • Impact of wind speeds on tall buildings

  5. Method: VAD Analysis • Technique • Why location was good

  6. Method: Exponential Fit • zo, d, z and u* • zo ~0.8-1.4m in centers of large towns • zo ~1.5-2.5m in centers of cities with tall buildings • zo ~10m in Appalachian Mnts • zo ~60m in Rocky Mnts Band 9b Results zo= 0.9628 (0.61-2.69) u*=0.2321 (0.17-0.45) d=0 d small/stable Average Results zo= 1.5023 u*=0.2443 d=0 d large/unstable

  7. Extrapolating Low-Level Winds • For each band:

  8. Comparison of Calculated Low-Level Winds With CSTARS Tower

  9. Comparison of fit and wxt at surface (10 m)

  10. Mid-levels: Inflection point Correlation= -0.35

  11. High levels • Structure above inflection point • Jets • Direction shifts • Individual profiles

  12. Summary/Conclusions

  13. Future Work

More Related