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Analysing individual recession events: sensitivity of parameter determination to the calculation procedure |
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| Authors: | Bo Chen Witold Krajewski |
| Institution: | 1. The State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing, China;2. Stanley Hydraulics Laboratory, IIHR-Hydroscience &3. Engineering, The University of Iowa, Iowa City, IA, USAbochen@bnu.edu.cn;5. Stanley Hydraulics Laboratory, IIHR-Hydroscience &6. Engineering, The University of Iowa, Iowa City, IA, USA |
| Abstract: | ABSTRACTThis study assesses the sensitivity to model fitting methods and segment selection of the estimated parameters A and B of the model dQ/dt = ?AQB for individual events. We investigated about 750 recession events observed at 25 US Geological Survey gauges in the Iowa and Cedar river basins in the United States, with drainage areas ranging from 7 to 17 000 km2. The parameters of these recession events were estimated using three commonly adopted methods and recession segments with different extraction criteria. The results showed that the variations of the parameter estimates for the same recession event were comparable to the variations of parameters between different events due to using different model fitting methods and recession segments. This raises cautions for comparative analysis of individual recessions. The result also implies that the nonlinear direct fitting method is the most robust among the three model fitting methods compared. EDITOR Z.W. Kundzewicz ASSOCIATE EDITOR T. Okruszko |
| Keywords: | Recession analysis recession variability recession parameters model fitting |