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Implementation of the fully-distributed and physically-based FEST-WB model

Universitat de les Illes Balears. Reunión PREDIMED 2014A 5-6 Junio. Implementation of the fully-distributed and physically-based FEST-WB model. A. Amengual. Grup de Meteorologia, Departament de Física, Universitat de les Illes Balears, Palma, Mallorca, Spain

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Implementation of the fully-distributed and physically-based FEST-WB model

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  1. Universitat de les Illes Balears Reunión PREDIMED 2014A 5-6 Junio Implementation of the fully-distributed and physically-based FEST-WB model A. Amengual Grup de Meteorologia, Departament de Física, Universitat de les Illes Balears, Palma, Mallorca, Spain e-mail: arnau.amengual@uib.es

  2. Overview of the FEST-WB model • The Serpis flash-flood event • Preliminary results • Future tasks Implementation of thephysically-baseddistributed FEST-WB model

  3. 1. Overview of the FEST-WB model • Flash-flood Event-based Spatially-distributed rainfall-runoff Transformation – including Water Balance • Computes the main processes of the hydrological cycle: • Evapotranspiration • Infiltration • Surface runoff • Flow routing • Subsurface flow • Groundwater flow • Snow dynamics

  4. 1. Overview of the FEST-WB model

  5. 1. Overview of the FEST-WB model • Computational domain is meshed with a net regular square cells (200 meters) • Continuous soil moisture accounting: • Runoff is computed according to a modified SCS-CN method. Potential maximum retention, S, is updated as a linear function of the degree of saturation (ε): • Actual evapotranspiration, EVT, calculated using the Hargreaves equation • Surface and sub-surface routing: Muskingum-Cunge method in its non-linear form • Reservoir: Flow routing is described using the level pool scheme.

  6. 2. The Serpis flash-flood event: synoptic situation 1. Upper-level closed trough 2. Strong high pressures over Western Europe 3. Low pressures over northern Africa 4. Low-level jet: advection of warm and moist air toward Valencia from the Mediterranean 5. Orographic lifting (Sierra de Aitana)

  7. 2. The Serpis flash-flood event: synoptic situation Quasi-stationary MCSs

  8. 2. The Serpis flash-flood event: observations • Torrential precipitation took place on 11 and 12 October 2007 • Accumulated precipitation amounts above 400 mm • The Serpis catchment is a small size basin with an area of 752.8 km2and a length close to 74.5 km. • Accumulated rainfall above 300 mm from 00 to 12 UTC 12 October 2007 inside this basin

  9. 2. The Serpis flash-flood event: observations • Peak discharges: • Vernissa: Qp=315 m3s-1 • Beniarrés: Qp=260 m3s-1 • Carrós: Qp=200 m3s-1 • 1 fatality. 200 people evacuated

  10. 3. Preliminary results

  11. 3. Preliminary results

  12. 3. Preliminary results

  13. 3. Preliminary results

  14. 3. Preliminary results

  15. 3. Preliminary results

  16. 3. Preliminary results

  17. 3. Preliminary results

  18. 4. Future tasks • How can we improve flash-flooding process knowledge and forecasting? • 1. Which are the hydrological characteristics of extreme floods in the semi-arid Mediterranean environment? • 1.1 To determine which are the main hydrological processes involved in flash-flooding for semi-arid river basins in the Mediterranean. • 1.2 To assess which is the specific role of the infiltration mechanism, soil moisture content and Hortonian flow before flash-floods in semi-arid river basins. • 2. How can we improve the hydrometeorological forecasting of flash-floods? • 2.1 To study the predictability of high impact weather related to intense rainfall and flash-flooding. • 2.2 To assess how meteorological uncertainties propagate through the hydrological models. • 2.3 To examine flash-flood predictability through advanced ensemble prediction hydrometeorological systems.

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