NDLI: Extension of TOPMODEL applications to the heterogeneous land surface

Content Provider	Springer Nature Link
Author	Deng, Huiping Sun, Shufen
Copyright Year	2010
Abstract	At present, the Topographic Index Model (TOPMODEL) has been recommended for integration in Land Surface Models (LSMs). But, the applicable scope of the original TOPMODEL (OTOP) is limited because the OTOP derivation relies on three fundamental but unrealistic assumptions. In this paper, several versions of a generalized TOPMODEL (GTOP), which relax some unrealistic assumptions involved in OTOP, are presented, and the theoretical derivationsn to obtain these modifications are demonstrated in detail. Specifically, the extension for the OTOP applicability comes down to following three basic cases: (1) Give up the assumption of spatially uniform recharge rate to the groundwater and let the rate be spatially varying, (2) Keep same original exponential distribution profile of hydraulic conductivity used in OTOP but change the saturated hydraulic conductivity and effective soil depth from spatial constants in OTOP to spatially variable quantities; and (3) Extend the original exponential distribution profile of hydraulic conductivity to more general power law distribution profile of hydraulic conductivity together with spatially variable saturated hydraulic conductivity and effective soil depth. Finally, a brief numerical sensitivity study based on one version of GTOP using an exponential distribution profile for soil hydraulic conductivity is conducted. This shows the heterogeneous effects of the effective soil depth, saturated hydraulic conductivity, at ground surface and groundwater recharge rate on hydrological processes and serves as an example application of GTOP to a heterogeneous catchment.
Starting Page	164
Ending Page	176
Page Count	13
File Format	PDF
ISSN	02561530
Journal	Advances in Atmospheric Sciences
Volume Number	27
Issue Number	1
e-ISSN	18619533
Language	English
Publisher	SP Science Press
Publisher Date	2009-12-29
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	TOPMODEL theoretical derivation spatial heterogeneity application extension Geophysics/Geodesy Meteorology/Climatology
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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