RainGain Project Meeting: High Resolution Rainfall Rate Estimation and Forecast
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1 RainGain Project eeting: High Resolution Rainfall Rate Estimation and Forecast Ricardo Reinoso Rondinel and Herman Russchenberg Faculty of Electrical Engineering, athematics and Computer cience, Remote ensing of the Environment, echnology echnology 1 Remote sensing of the environment (RE) RainGain Project 5 th ctober 1
2 A Where do I come from? echnology Remote sensing of the environment (RE)
3 aster work at he klahoma, UA echnology Remote sensing of the environment (RE) 3
4 aster work at he klahoma, UA echnology Remote sensing of the environment (RE) 4
5 Coming to the Netherlands (6 months ago) echnology Remote sensing of the environment (RE) 5
6 PhD work at U, NL High resolution rainfall rate estimation and forecast: WP1 & WP echnology Remote sensing of the environment (RE) 6
7 PhD work at U, NL Ø Develop an novel procedure to estimate and forecast accurate rainfall rate (R) at urban scale in Rotterdam city. Ø perate the new X-band polarimetric weather radar and possibly others sensing instruments. echnology Remote sensing of the environment (RE) 7
8 Foreseen Issues Estimation of rainfall rate is not straightforward X-band polarimetric radar l l l l l (3) Low scan rate Radar level (1) Hydrometeors contamination Radar resolution volume () pace and time variability of drop size distributions (DDs) Ground level echnology Remote sensing of the environment (RE) 8
9 (1) Hydrometeors contamination How to distinguish rain among others hydrometeors? Characterizing physical and electromagnetic properties: hape, ize, emperature Electric energy Wave scattering of the following hydrometeors: at X-band frequency (~1GHz). E Raindrops, Ice, and ixtures (water, ice, air) echnology Remote sensing of the environment (RE) 9
10 Raindrops (1) Hydrometeors contamination 6 Polarimetric variables vs. Rainfall rate Polarimetric Radar Variables for Rain at = 3 cm and = 15 o C Reflectivity (Z) dbz Differential Reflectivity (Z dr ) db 3 How to characterize raindrops? Polarimetric radar variables (theoretical) FI Horizontal FI Vertical R mm h Way pecific Attenuation (A) db km 1 FI Horizontal FI Vertical Way pecific Diff Atte (A dp ) db km 1 Ice (hailstones) ix (bright band) DD shape 1 Way pecific Diff Phase (K dp ) deg km 1 1 Way Differential Backscatt Phase (d co ) deg 8 6 assumed echnology Remote sensing of the environment (RE) 1
11 () pace and time variability of drop size distributions (DDs) l l l l l Radar level DD(h n,t) DD(h n-1,t) 1 Ground level h DD(h 1,t) DD(h,t) icro rain radar How does DD variability impact on rainfall rate estimation and forecast at ground level? diammeter (mm) Parsivel echnology Remote sensing of the environment (RE) 11 # 1 1 1
12 () pace and time variability of drop size distributions (DDs) Hyex facility: Parsivel data Z h (dbz) A dp (db Km 1 ) Z dr (db) A h (db Km 1 ) K dp (degree Km 1 ) d co (degrees) 5 5: 6: 7: 8: 9: 1: 11: 1: 13: 14: 15: 16: 17: 18: 19: 3 1 5: 6: 7: 8: 9: 1: 11: 1: 13: 14: 15: 16: 17: 18: 19: 3 1 5: 6: 7: 8: 9: 1: 11: 1: 13: 14: 15: 16: 17: 18: 19:.5 5: 6: 7: 8: 9: 1: 11: 1: 13: 14: 15: 16: 17: 18: 19: 1 5 5: 6: 7: 8: 9: 1: 11: 1: 13: 14: 15: 16: 17: 18: 19: 5 5: 6: 7: 8: 9: 1: 11: 1: 13: 14: 15: 16: 17: 18: 19: 1 5 Light rain, R < 5 mmh -1 5: 6: 7: 8: 9: 1: 11: 1: 13: 14: 15: 16: 17: 18: 19: ime (UC) Polarimetric Radar Variables for Rain at = 3 cm and = 15 o C Reflectivity (Z) dbz Differential Reflectivity (Z dr ) db 3 P DD.5 Real DD R mm h 1 FI Horizontal FI Vertical 1 Way pecific Attenuation (A) db km Way pecific Diff Phase (K dp ) deg km Way pecific Diff Atte (A dp ) db km Way Differential Backscatt Phase (d co ) deg echnology Remote sensing of the environment (RE) 1
13 (3) Low scan rate Conventional scanning (36 o ) PPI Low R ector scanning High R How to increase scan rate? echnology Remote sensing of the environment (RE) 13
14 pen Plan ü Use facilities of Cesar bservatory and Hyex as testbeds for Rotterdam radar. ü Continue previous work (DD and Rainfall rate retrievals) from obias tto and Herman Russchenberg. ü Partners cooperation. echnology Remote sensing of the environment (RE) 14
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