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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water resources and hydroinformatics : Study on parameters estimation of the xaj model based on underlying surface characteristics
Study on parameters estimation of the xaj model based on underlying surface characteristics
Author : XING-NAN ZHANG(1), YUAN-HAO FANG(2) , BO QU(3) & DA-ZHONG XIA(
ABSTRACT
Hydrological models are essential in assessing hydrological processes at both hillslope and watershed scale. The Xin¡¯anjiang (XAJ) Model is a conceptually-based model which was developed on the basis of conception of hillslope hydrology. Although processes like evapotranspiration, runoff yield and routing are represented by generalization rather than physically-based partial differential equations, several parameters of the model have rigid physical definitions which can be estimated by characteristics of the watershed. Due to the lack of measurement and data, however, these parameters were mainly estimated by calibration which will need high technology and more uncertainty may been introduced into the model. Recently, benefiting from GIS and RS, data have been significantly improved in both the quantity and the quality. In this paper, the indices of the underlying surface of a watershed were derived firstly (e.g. the slope and aspect of hillside, roughness, soil, vegetation, etc.), these indices were then employed to establish the relationships with the parameters on the basis of the physical definitions or the statistical analysis purely. By use of this approach, the overall performance of the XAJ model was much more robust than that of the calibration, and more suitable to be used in ungauged catchments.
File Size : 1,245,323 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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