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Meeting, 6 – 10 November 2006, Lisbon, Portugal

GABARDINE. Meeting, 6 – 10 November 2006, Lisbon, Portugal. WP 2 - Rainfall Uncertainty Model.

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Meeting, 6 – 10 November 2006, Lisbon, Portugal

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  1. GABARDINE Meeting, 6– 10 November 2006, Lisbon, Portugal WP 2 - Rainfall Uncertainty Model Haim Kutiel, Shlomit Paz, Hadas Reiser (kutiel@geo.haifa.ac.il, shlomit@geo.haifa.ac.il, hraiser@geo.haifa.ac.il)&Lea Wittenberg(leaw@geo.haifa.ac.il)Laboratory of Climatology,Department of Geography & Environmental Studies,University of Haifa

  2. GABARDINE Introduction The MERR (Most Expectable Rainfall Regime) in the four test sites was analyzed using daily data from relevant stations within or in the vicinity of each site. Median values of each component of the MERR and their time series will be presented. All analyses were done and all parameters were obtained by means of RUM2005 software. The daily rainfall threshold was set to 1.0 mm and the Beginning Date of Rainy Season (BDRS) was set on July 1st, to avoid splitting of the rainy season into two different years. Almost all parameters can be tailored and easily changed at the user will, e.g., daily thresholds, sub-periods or definition of the beginning and end of the rainy season and so on.

  3. GABARDINE Selected stations from the four test-sites Spain – Low Llobregat River area: Barcelona Portugal – Algarve region: Lagos, Picota Greece – The Thessaloniki Basin: Sindos,Thessaloniki Israel/Gaza – Southern Coastal Aquifer: Nirim,Dorot

  4. Source: Sanchez-Vila X. et al., 2006 - GABARDINE Test Site Characterization GABARDINE Location map of the Low Llobregat River area - Spain

  5. Source: Lobo-Ferreira J.P. et al., 2006 - GABARDINE Test Site Characterization GABARDINE Location map of the Algarve test site - Portugal

  6. GABARDINE Location map of the Thessaloniki Basin test site - Greece

  7. GABARDINE Location map of the - Southern Coastal Aquifer test site - Israel

  8. GABARDINE Parameters describing the annual rainfall TOTAL(d) Total rainfall [mm] accumulated from all rain spells of a given duration [days]. SAR(j,r,p) Daily Sorted Accumulated Rainfall for each Julian day ( j = 1 for July 1st,…j = 365 for June 30th), any daily rainfall threshold (r = 1.0 mm) and for various probabilities (p). SAP(j,r,p) Daily Sorted Accumulated Percentage for each Julian day ( j = 1 for July 1st,…j = 365 for June 30th), any daily rainfall threshold (r = 1.0 mm) and for various probabilities (p).

  9. GABARDINE Median TOTAL at all test sites

  10. Earliest Latest GABARDINE Daily SAR for Barcelona

  11. GABARDINE Daily SAR for Lagos and Picota

  12. GABARDINE Daily SAR for Sindos and Thessaloniki

  13. GABARDINE Daily SAR for Nirim and Dorot

  14. GABARDINE Daily SAP for Barcelona

  15. GABARDINE Daily SAP for Lagos and Picota

  16. GABARDINE Daily SAP for Sindos and Thessaloniki

  17. GABARDINE Daily SAP for Nirim and Dorot

  18. GABARDINE Parameters describing the temporal rainfall distribution DAP (k) Median Date of Accumulated Percentage (k=10, 20, … ,90) of an annual rainfall [days, since July, 1]. RSL Rainy Season Length [days] from the date when 10% of the annual rainfall amount until the date of 90% were accumulated RSL=DAP(90)-DAP(10)

  19. GABARDINE Median DAPs and RSLs for all test sites

  20. RSL RSL GABARDINE Comparison of RSL between Sindos and Dorot

  21. GABARDINE Parameters describing the Rain Spell distribution NRS(d) Number of Rain Spells of a given duration [days]. RC(d) Relative contribution [%] of rain spells of a given duration [days]. Dividing TOTAL(d) by NRS(d) yields: TOTAL(d)/NRS(d)=RSY(d) RSY(d) Rain Spell Yield [mm]. The average rainfall accumulated during all rain spells of a given duration [days].

  22. GABARDINE NRS for the Spanish and Portuguese test sites

  23. GABARDINE NRS for the Greek and Israeli test sites

  24. GABARDINE Relative Contribution for the Spanish and Portuguese test sites

  25. GABARDINE Relative Contribution from the Greek and Israeli test sites

  26. GABARDINE RSY for the Spanish and Portuguese test sites

  27. GABARDINE RSY for the Greek and Israeli test sites

  28. GABARDINE Rain Spell Yield day-1 for the Spanish and Portuguese test sites

  29. GABARDINE Rain Spell Yield day-1 for the Greek and Israeli test sites

  30. GABARDINE Parameters describing the distribution of extreme values AMED(d) Average/Median Ratio. AMED(d) = (Average(d)-Median(d))*100/Median(d) For a symmetrical distribution this parameter equals 0. High values of this ratio mean a positively skewed distribution caused by few extreme cases. 50R/50D(d)50% Rainfall/50% Rain-Days Ratio. For a perfect fit, this ratio equals 1. High values of this ratio mean that very few rain spells contributed most of the rainfall.

  31. GABARDINE AMED for all test sites

  32. GABARDINE 50R:50D for the Spanish and Portuguese test sites

  33. GABARDINE 50R:50D for the Greek and Israeli test sites

  34. GABARDINE 50R:50D in all test sites

  35. GABARDINE Parameters describing Dry Spells Distribution DSD(j,r,p) Dry Spells Distribution. This parameter calculates the time [days] elapsed from the last rainy day for each Julian day ( j = 1 for July 1st,…j = 365 for June 30th), any daily rainfall threshold (r = 1.0 mm) and for various probabilities (p).

  36. GABARDINE Median and longest DSD and the sorted dry spells for Barcelona

  37. GABARDINE Sorted dry spells for Lagos and Picota

  38. GABARDINE Sorted dry spells for Sindos and Thessaloniki

  39. GABARDINE Sorted dry spells for Nirimand Dorot

  40. GABARDINE Annual course of dry spells for the Spanish and Portuguesetest sites

  41. GABARDINE Annual course of dry spells for Greek and Israeli test sites

  42. GABARDINE Summary Rainfall TOTAL at the test sites varies from almost 600 mm (Picota) to less than 300 mm (Nirim). The RSL decrease from 8.5 months at the Greek and the Spanish stations to about 3.5 month at the Israeli stations. Half of the annual rainfall is obtained as early as the end of November at Barcelona but only in mid January at the Israeli stations. In all sites, the NRS of one-day is the greatest, however, at the Portuguese and Israeli sites, the relative contribution of two-days’ spells (or even three-days) is larger than the contribution of spells of one-day. The longest median DSD varies from 12 days (Thessaloniki) to 177 days (Nirim). However, the absolute longest DSD varies from 67 days (Barcelona) to 300 days (Nirim).

  43. GABARDINE Further to do Mapping of the MERR components. Analysis of time series of the MERR components and their deviations from the median values. Definition, calculation and analysis of the Rainfall Regime Uncertainty (RRU) components and their time series. Analysis and mapping of extreme values.

  44. GABARDINE The BDRS for the Spanish and Portuguesetest sites

  45. GABARDINE The BSRD for Greek and Israeli test sites

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