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Acta Meteorologica Sinica

, Volume 26, Issue 1, pp 93–102 | Cite as

Development and application of an atmospheric-hydrologic-hydraulic flood forecasting model driven by TIGGE ensemble forecasts

  • Hongjun Bao (包红军)
  • Linna Zhao (赵琳娜)Email author
Article

Abstract

A coupled atmospheric-hydrologic-hydraulic ensemble flood forecasting model, driven by The Observing System Research and Predictability Experiment (THORPEX) Interactive Grand Global Ensemble (TIGGE) data, has been developed for flood forecasting over the Huaihe River. The incorporation of numerical weather prediction (NWP) information into flood forecasting systems may increase forecast lead time from a few hours to a few days. A single NWP model forecast from a single forecast center, however, is insufficient as it involves considerable non-predictable uncertainties and leads to a high number of false alarms. The availability of global ensemble NWP systems through TIGGE offers a new opportunity for flood forecast. The Xinanjiang model used for hydrological rainfall-runoff modeling and the one-dimensional unsteady flow model applied to channel flood routing are coupled with ensemble weather predictions based on the TIGGE data from the Canadian Meteorological Centre (CMC), the European Centre for Medium-Range Weather Forecasts (ECMWF), the UK Met Office (UKMO), and the US National Centers for Environmental Prediction (NCEP). The developed ensemble flood forecasting model is applied to flood forecasting of the 2007 flood season as a test case. The test case is chosen over the upper reaches of the Huaihe River above Lutaizi station with flood diversion and retarding areas. The input flood discharge hydrograph from the main channel to the flood diversion area is estimated with the fixed split ratio of the main channel discharge. The flood flow inside the flood retarding area is calculated as a reservoir with the water balance method. The Muskingum method is used for flood routing in the flood diversion area. A probabilistic discharge and flood inundation forecast is provided as the end product to study the potential benefits of using the TIGGE ensemble forecasts. The results demonstrate satisfactory flood forecasting with clear signals of probability of floods up to a few days in advance, and show that TIGGE ensemble forecast data are a promising tool for forecasting of flood inundation, comparable with that driven by raingauge observations.

Key words

ensemble flood forecast TIGGE ensemble predictions Xinanjiang model one-dimensional unsteady flow model flood diversion and retarding Huaihe River 

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Copyright information

© The Chinese Meteorological Society and Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Hongjun Bao (包红军)
    • 1
    • 2
  • Linna Zhao (赵琳娜)
    • 1
    • 2
    Email author
  1. 1.Public Meteorological Service CenterChina Meteorological AdministrationBeijingChina
  2. 2.National Meteorological CenterChina Meteorological AdministrationBeijingChina

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