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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water resources and hydroinformatics : A parameterization scheme of distributed hydrological model to reflect the elevation influences in t...
A parameterization scheme of distributed hydrological model to reflect the elevation influences in the tongtian river basin
Author : YANGWEN JIA (1), JIAJIA LIU (2), ZUHAO ZHOU (3), CUNWEN NIU (4), HAO WANG (5) & JINSHENG JIA (6)
ABSTRACT
To reflect the spatial heterogeneity of the hydrological parameters, the parameterization scheme of most distributed
hydrological models is realized by subdividing a study area into numerous computational units (i.e., hydrological response
units, HRU) in terms of land cover, soil type and sub-catchment etc., in each of which uniform parameter values are
assumed. This kind of parameterization is a planar parameterization scheme just considering the heterogeneity in
horizontal direction, without reflection of the heterogeneity impacts at vertical direction. However, in high mountain areas,
vegetation ecosystem, hydro-meteorology, soil and topography etc are highly influenced by elevation. In other word,
elevation is a vital factor influencing the parameterization. Thus, a new three-dimensional parameterization scheme is
proposed to reflect the elevation influences, i.e., the value of height and other correlative factors are used to estimate the
value of hydrological parameters, such as depression depth of land surface, leaf area index (LAI), slope, soil thickness
and other parameters. An application is performed to test the effect of the three-dimensional parameterization scheme, in
which the distributed hydrological model named water and energy transfer processes in large river basins (WEP-L) is
adopted for the improvement, and the Tongtian River Basin (which is the source of Yangtze River and has an elevation
range from 3500 to 6500 m) in the southwest of China is taken as the study area. The application results indicate that the
newly-suggested parameterization scheme can rationally depict the vertical heterogeneity of hydrological parameters, and
it also improves the simulation results of river flows by a comparison with the original model
File Size : 448,822 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water resources and hydroinformatics
Date Published : 28/08/2015
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