1 / 10

The FEWS Flood Risk Monitoring Model From Rain to Rivers

The FEWS Flood Risk Monitoring Model From Rain to Rivers. Tanya Hoogerwerf Thursday, February 22, 2001. FEWS Model. Provides a continuous simulation of stream flow, on a daily time step, for nearly 3,000 basins on the African continent. Rainfall/runoff simulation model containing…

devona
Download Presentation

The FEWS Flood Risk Monitoring Model From Rain to Rivers

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. The FEWS Flood Risk Monitoring ModelFrom Rain to Rivers Tanya Hoogerwerf Thursday, February 22, 2001

  2. FEWS Model • Provides a continuous simulation of stream flow, on a daily time step, for nearly 3,000 basins on the African continent. • Rainfall/runoff simulation model containing… • a soil water accounting module that produces surface and sub-surface runoff for each sub-basin • an upland headwater basins routing module • and a major river routing module.

  3. Runoff Producing Mechanisms • Surface runoff due to precipitation excess (including direct runoff from impermeable areas of the basin) • Rapid Subsurface Flow (interflow), and • Base Flow

  4. Soil Water Accounting Module (SAC-SMA) Revisited FEWS: Active Zone (2 layers) & Groundwater Zone (1 layer) Active Layer Baseflow

  5. Runoff Calculations • The HYDRO1K data provide basin boundaries and stream networks that form the spatial framework of the model. • The FAO soil map provides characterization of the hydraulic properties of the earth's surface that are required to compute the water balance within a basin. • The NOAA RFE provide the estimates of gross precipitation input to each basin.

  6. Total Channel Inflow (SAC-SMA) uT = Channel Inflow from SWC= Surface Runoff + Base Flow Runoff Surface Runoff = f(Precipitation, Soil Water Content, SR Gen.) Base Flow Runoff = f(BF Recession Rate, SWC, BF Lost to Aquifers) Water Balance Relationship for Each Reach: dSidt = Ui-1 + pi*uT – Ui S=Water Volume Pi = Fraction of Total Water Inflow Corresponding to Reach i Ui = Reach i Ui-1 = Upstream Inflow from Reach i-1

  7. Time of Concentration Grid • Slope, flow direction, and flow accumulation grids of the HYDRO1K • Manning equation for flow in an open channel • Units: 1/10 day

  8. Rainfall • NOAA has produced RFE images (Herman et al., 1997) on a dekadal (10-day) time step • Basin Excess Rainfall Maps (BERM) Produced

  9. Output Mozambique Flood Information Stream Flow Model Flood Risk Map Page (select Pfafstetter Basin)

  10. USGS/EROS Data Center http://edcsnw3.cr.usgs.gov/ip/gflood/ Riverside Technology Real-Time Prediction for Flood Warning and Management- Georgakakos 1995 Coupled Rainfall-Flow Forecasting Models- Georgakakos References

More Related