Meeting:Abstract 2011 CSDMS meeting-018: Difference between revisions
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|CSDMS meeting first name=Sagy | |CSDMS meeting first name=Sagy | ||
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|CSDMS meeting institute=CSDMS, INSTAAR, | |CSDMS meeting institute=CSDMS, INSTAAR, University of Colorado | ||
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|CSDMS meeting email address=sagy.cohen@colorado.edu | |CSDMS meeting email address=sagy.cohen@colorado.edu | ||
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|CSDMS meeting abstract title= | |CSDMS meeting abstract title=Improved water discharge predictions in WBMsed, a Global riverine Sediment Flux model | ||
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|CSDMS meeting coauthor first name abstract=Albert | |||
|CSDMS meeting coauthor last name abstract=Kettner | |||
|CSDMS meeting coauthor institute / Organization=CSDMS, INSTAAR, University of Colorado, Boulder | |||
|CSDMS meeting coauthor town-city=Boulder | |||
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|CSDMS meeting coauthor email address=kettner@colorado.edu
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|CSDMS meeting coauthor first name abstract=James | |||
|CSDMS meeting coauthor last name abstract=Syvitski | |||
|CSDMS meeting coauthor institute / Organization=CSDMS, INSTAAR, University of Colorado, Boulder | |||
|CSDMS meeting coauthor town-city=Boulder | |||
|State=Colorado | |||
|CSDMS meeting coauthor country=United States | |||
|CSDMS meeting coauthor email address=james.syvitski@colorado.edu
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|CSDMS meeting abstract=WBMsed is a spatially and temporally explicit global riverine model predicting suspended and bedload sediment fluxes based on the WBMplus water balance and transport model (part of the FrAMES biogeochemical modeling framework). The model incorporates climate input forcings to calculate surface and subsurface runoff for each grid cell. The prediction of fluvial sediment fluxes is highly dependent on how well its transport medium, riverine water, is simulated. Our analyses indicate that average water discharges are well predicted by the WBMplus model. However, daily freshwater predictions are often over or under predicted by up to an order of magnitude, significantly affecting the accuracy of sediment flux simulation capabilities of WBMsed and indicating that certain hydrological processes are less captured within the model. One of these processes could be temporal storage of water discharge on floodplains, dampening the water hydrograph significantly. In WBMsedv2.0 we incorporate a floodplain reservoir component to improve daily water discharge simulations. The Floodplain reservoir component is used in WBMsedv2.0 to store overbank water flow which are refurbished back to the river once its water level has subsided. Here we compare two methods for determining overbank flow: (1) the log-Pearson III (flood frequency analysis) 5-year maximum discharge recurrence and (2) an empirical relationship between mean river discharge and river width and bank height. | |||
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Latest revision as of 14:10, 10 June 2017
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Improved water discharge predictions in WBMsed, a Global riverine Sediment Flux model
[[Image:|300px|right|link=File:]]WBMsed is a spatially and temporally explicit global riverine model predicting suspended and bedload sediment fluxes based on the WBMplus water balance and transport model (part of the FrAMES biogeochemical modeling framework). The model incorporates climate input forcings to calculate surface and subsurface runoff for each grid cell. The prediction of fluvial sediment fluxes is highly dependent on how well its transport medium, riverine water, is simulated. Our analyses indicate that average water discharges are well predicted by the WBMplus model. However, daily freshwater predictions are often over or under predicted by up to an order of magnitude, significantly affecting the accuracy of sediment flux simulation capabilities of WBMsed and indicating that certain hydrological processes are less captured within the model. One of these processes could be temporal storage of water discharge on floodplains, dampening the water hydrograph significantly. In WBMsedv2.0 we incorporate a floodplain reservoir component to improve daily water discharge simulations. The Floodplain reservoir component is used in WBMsedv2.0 to store overbank water flow which are refurbished back to the river once its water level has subsided. Here we compare two methods for determining overbank flow: (1) the log-Pearson III (flood frequency analysis) 5-year maximum discharge recurrence and (2) an empirical relationship between mean river discharge and river width and bank height.
