Decision support for dam release during floods using a distributed biosphere hydrological model driven by quantitative precipitation forecasts

This study proposes a decision support system for real‐time dam operation during heavy rainfall. It uses an operational mesoscale quantitative precipitation forecast (QPF) to force a hydrological model and considers the forecast error from the previous time step, which is introduced as a perturbatio...

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Bibliographic Details
Published in:Water resources research 2010-10, Vol.46 (10), p.n/a
Main Authors: Saavedra Valeriano, Oliver C., Koike, Toshio, Yang, Kun, Graf, Tobias, Li, Xin, Wang, Lei, Han, Xujun
Format: Article
Language:English
Subjects:
Biosphere
Climate change
Dams
Downstream
flood control
Flood damage
Floods
forecast error
Hydrologic models
Hydrology
Monte Carlo simulation
multireservoir
Normal distribution
Objective function
optimization
Precipitation
QPF
Rain
Rainfall intensity
real-time operation
Reservoir storage
Reservoirs
River basins
Storm damage
Stream discharge
Stream flow
Typhoons
Water storage
Weather forecasting
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Summary:This study proposes a decision support system for real‐time dam operation during heavy rainfall. It uses an operational mesoscale quantitative precipitation forecast (QPF) to force a hydrological model and considers the forecast error from the previous time step, which is introduced as a perturbation range applied to the most recent QPF. A weighting module accounts for the location, intensity, and extent of the error. Missing precipitation intensities within contributing areas and information from surrounding areas can both be considered. Forecast error is defined as the ratio of QPF to the observed precipitation within an evaluation zone (sub‐basin, basin, buffer, or total domain). An objective function is established to minimize the flood volume at control points downstream and to maximize reservoir storage. The decision variables are the dam releases, which are constrained to the ensemble streamflow's information. A prototype was applied to one of the most important river basins in Japan, the Tone reservoir system. The efficiency of the approach was evident in reduced flood peaks downstream and increased water storage. The results from three events indicate that the developed decision support system is feasible for real‐life dam operation.
ISSN:0043-1397
1944-7973
DOI:10.1029/2010WR009502