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Dynamic TOPMODEL: A new implementation in R and its sensitivity to time and space steps
Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ, England..
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ, England..
Univ Bristol, Sch Geog, Bristol BS8 1SS, Avon, England..
2015 (English)In: Environmental Modelling & Software, ISSN 1364-8152, E-ISSN 1873-6726, Vol. 72, 155-172 p.Article in journal (Refereed) Published
Abstract [en]

In 2001, Beven and Freer introduced a "dynamic" variant of TOPMODEL that addressed some of the limitations of the original model whilst retaining its computational and parametric efficiency. The original assumption of a quasi-steady water table was replaced by time-dependent kinematic routing within hydrological similar areas. The new formulation allows a more flexible discretisation, variable upslope drainage areas and spatially variable physical properties. There has, however, never been a freely distributable version of dynamic TOPMODEL. Here, we describe a new, open source, version developed in the R environment. It incorporates handling of geo-referenced spatial data that allows it to integrate with modern GIS. It makes use of data storage and vectorisation features of the language that will allow efficient scaling of the problem domain. The implementation is evaluated with data from a small catchment. The formulation of the model in terms of a flow distribution matrix is described and its use illustrated for treatment of surface and subsurface flow routing. The model uses an improved implicit solution for updating the subsurface storages and fluxes. The paper focuses on the robustness of the predicted output variables to changes in the time and space discretisations.

Place, publisher, year, edition, pages
2015. Vol. 72, 155-172 p.
Keyword [en]
Dynamic TOPMODEL, R, Gwy, Plynlimon, Distributed hydrological model
National Category
Environmental Management
URN: urn:nbn:se:uu:diva-265682DOI: 10.1016/j.envsoft.2015.06.010ISI: 000361906400014OAI: oai:DiVA.org:uu-265682DiVA: diva2:866939
Available from: 2015-11-04 Created: 2015-11-02 Last updated: 2015-11-04Bibliographically approved

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