Conference proceeding
A hydrologic routing model based on geomorphological characteristics of the river network
American Geophysical Union Fall Meeting, Vol.2017
American Geophysical Union Fall Meeting, 2017
12/2017
Abstract
The Iowa Flood Center (IFC) provides streamflow forecasts for about 2000 locations in Iowa using a real-time distributed hydrologic model, forced with radar and raingage rainfall information. The model structure is based on ordinary differential equations that represent the flow of water from the hillslopes to the channels of the river network. The formulation of the routing of water across the rivers constitutes a fundamental aspect of the model, because this component is mostly responsible for providing estimates of the time-to-peak and peak magnitude. The routing model structure of the system is based on the scaling properties of river velocity with the discharge and drainage area of the channel, which can be written in terms of a power-law function. This study examines how this scaling relation is connected to the Horton-Strahler order of the channel network. This evaluation represents a step forward towards formulating model structures that are based on characteristics that are invariant across spatial scales. We proposed a routing model for every different Horton orders of the network, by adjusting a power-law function to available observations of velocity and discharge provided by USGS. The models were implemented into the Hillslope-Link Model (HLM) of the IFC for offline evaluation. Model simulations were compared to discharge observations to assess their performance, and compared to simulations obtained with other hydrologic routing schemes, to determine if the new formulation improves performance of the model.
Details
- Title: Subtitle
- A hydrologic routing model based on geomorphological characteristics of the river network
- Creators
- W. F Krajewski - University of IowaFelipe QuinteroGanesh GhimireM Rojas
- Resource Type
- Conference proceeding
- Publication Details
- American Geophysical Union Fall Meeting, Vol.2017
- Conference
- American Geophysical Union Fall Meeting, 2017
- Publisher
- American Geophysical Union
- Alternative title
- AGU 2017 fall meeting
- Language
- English
- Date published
- 12/2017
- Academic Unit
- IIHR--Hydroscience and Engineering; Civil and Environmental Engineering
- Record Identifier
- 9984202145502771
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