Journal
JOURNAL OF HYDROLOGY
Volume 466, Issue -, Pages 37-46Publisher
ELSEVIER
DOI: 10.1016/j.jhydrol.2012.07.048
Keywords
Regionalization approaches; Ungauged catchments; Catchment characteristics; Comparison
Funding
- National Basic Research Program of China [2010CB951103]
- Adapting to Climate Change in China (ACCC) project
- UK Department for International Development (DFID)
- Swiss Agency for Development & Cooperation (SDC)
- UK Department for Energy and Climate Change (DECC)
- International Science & Technology Cooperation Program of China [2010DFA24330]
- Non-profit Industry Program of the Ministry of Water Resources of China [201101015, 20110100304]
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Streamflow predictions in ungauged catchments are a challenge for hydrologists around the world. Using the Variable Infiltration Capacity model, the comparison of two regionalization approaches - one based on regression and the other on similarity - was investigated in 55 catchments in China under multiple hydro-climatic conditions. The regression-based approach was based on multiple regression equations using the calibrated model parameters as the dependent variables and catchment physical characteristics as the independent variables. The similarity-based approach considered the weights of five donor catchments, according to a combination of physical similarity and spatial proximity. The comparison of the two regionalization approaches indicated that the similarity-based approach was more accurate than regression-based approach, both for humid regions and arid regions; with greater aridity, the similarity-based approach became increasingly more accurate than the regression-based approach. The uncertainty in the comparison of the different regionalization approaches should be investigated by more catchments in future studies. (C) 2012 Elsevier B.V. All rights reserved.
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