Abstract
Abstract Large-scale hydrological models are important tools for simulating the hydrological effect of climate change. As an indispensable part of the application of distributed hydrological models, large-scale flow routing methods can simulate not only the discharge at the outlet but also the temporal and spatial distribution of flow. The aggregated network-response function (NRF), as a scale-independent routing method, has been tested in many basins and demonstrated to have good runoff simulation performance. However, it had a poor performance and produced an unreasonable travel time when it was applied to certain basins due to a lack of consideration of the influence of the underlying surface. In this study, we improve the NRF routing method by combining it with a velocity function using a new routing parameter b to reflect the wave velocity's sensitivity to slope. The proposed method was tested in 15 catchments at the Yangtze River basin. The results show that it can provide better daily runoff simulation performance than the original routing model and the calibrated travel times in all catchments are more reasonable. Therefore, our proposed routing method is effective and has great potential to be applied to other basins.
Highlights
Climate change has received widespread attention from the scientific community and the public, as it has caused a series of serious problems, including natural disasters and extreme climate events (Kharin et al ; Chen et al ; Lu & Qin ; Ragettli et al )
A flow routing algorithm was developed by combining an aggregation network-response function (NRF) with a velocity function
The routing methods before and after the improvement were applied to 15 catchments in the Yangtze River using a daily Water and Snow Balance Modeling (WASMOD)-M model based on Hydro[1] k
Summary
Climate change has received widespread attention from the scientific community and the public, as it has caused a series of serious problems, including natural disasters and extreme climate events (Kharin et al ; Chen et al ; Lu & Qin ; Ragettli et al ). A large-scale routing method is an important part of a large-scale hydrological model, with which a distributed hydrological model can simulate the change in runoff at temporal and spatial scales (Beven ). Many routing methods based on a digital elevation model (DEM) have been developed (Wen et al ; Li et al ; Lu et al ; Huang & Lee ; Ling et al ; Fan et al ). Runoff routing based on a DEM is calculated in one of two ways (Olivera et al ): cell-to-cell and source-to-sink. The cell-to-cell method calculates the water movements from each grid to its adjacent downstream grid until the outlet grid of the basin is reached. The source-to-sink method, under the assumption that the water is rigid, directly calculates the water’s movement from the grid where runoff is generated to the outlet of the basin
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