1 / 22

SWI – Storm and Wastewater Informatics

UWT seminar 2010 Jesper Ellerbæk Nielsen ” Combining C-band and X-band weather radars for accurate precipitation measurements over urban areas” Supervisors: Michael R. Rasmussen (AAU) Rasphal Gill (DMI) Niels Ejner Jensen (DHI). SWI – Storm and Wastewater Informatics. WP 1. WP 2. WP 3. WP 4.

rasha
Download Presentation

SWI – Storm and Wastewater Informatics

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. UWT seminar 2010Jesper Ellerbæk Nielsen”Combining C-band and X-band weather radars for accurate precipitation measurements over urban areas”Supervisors:Michael R. Rasmussen (AAU)Rasphal Gill (DMI)NielsEjner Jensen (DHI)

  2. SWI – Storm and Wastewater Informatics

  3. WP 1 WP 2 WP 3 WP 4 WP 5 SWI – Storm and Wastewater Informatics • The PhD project is located within • WP2 • Aalborg University • DMI • DHI • 2 PhD • 2 Post Doc

  4. WP 1 WP 2 WP 3 WP 4 WP 5 SWI – Storm and Wastewater Informtic • The purpose of the project is to • improve the overall data quality • of weather radar precipitation • measurements.

  5. Weather radar measurements Its all about timing! It measures the electromagnetic waves reflected by the precipitation Indirect measurement of precipitation • How does the weather radar work?

  6. The traditional tipping bucked rain gauge

  7. Tipping bucked rain gauges - Rimco Read Contact • The tipping bucked rain gauge is measuring the weight of the water. Tipping bucked Outlet Bubble level

  8. C-band and X-band radars C-Band radar operated by DMI LAWR X-Band radar developed by DMI

  9. Weathers in Denmark X-bånd (Århus) X-bånd (Aalborg) X-bånd (Hvidovre) X-Bånd (Hørsholm) X-bånd (Odense) X-bånd (Vejle) X-bånd (Egedal) Marine X-band Radars, range 60 km Developed by DHI 500 x 500 m , 100 x 100 m spatial resolution, 5 min. temporal resolution C-band Radars, range 240 km Danish Metrological Institute (DMI) 2000 x 2000 m spatial resolution 10 min. temporal resolution

  10. Spatial resolution 2 x 2 km (C-Band) Kilde: COWI A/S og Aalborg kommune

  11. Spatial resolution 100 x 100 m (LAWR X-Band) Kilde: COWI A/S og Aalborg kommune

  12. But why all these radars? – Hypothesis for the project • It is possible to combine X-band radars with C-band weather radars, so that the • combination outperforms the individual radar. • Strategy: • Strengths of one radar type can compensate • the other radar types weaknesses. • Range • Resolution • Atmospheric attenuation • Ground clutter

  13. Exampel18/7-2009 C-band X-band

  14. Challenges in combination of radar data • What is detected by the radar, and how is the atmosphere integrated?

  15. Vertikal scanning radar • Based on a Furuno 1715 X-band marine radar a highly flexible radar has been • develobed • The purpose of the radar is by profiling the precipitation it will reveal what the • individual radar detects.

  16. Micro Radar Test Bed Stepper motor controlling the direction Analog - Digital converter Furuno 1715 display unit Furuno 1715 antenna Laptop managing the stream of data and the direction of the antenna

  17. Laser based distrometer – OTT Parsivel Describing the precipitation by drop size and drop velocity

  18. Laser based distrometer – OTT Parsivel

  19. Strategy for combination • Spectral analysis: • Break down the radar images into its spectral • components • Use the components as building bricks in • rebuild of a single result with properties of • both radars

More Related