Lane, S.N., Brookes, C.J., Kirkby, A.J. and Holden, J. (2004) A network-indexbased version of TOPMODEL for use with high-resolution digital topographic data. Hydrological Processes, 18 (1). pp. 191-201. ISSN 0885-6087Full text available as:
Available under licence : See the attached licence file.
This paper describes the preliminary development of a network index approach to modify and to extend the classic TOPMODEL. Application of the basic Beven and Kirkby (1979) form of TOPMODEL to high resolution (2.0 m) laser altimetric data (based upon the U.K. Environment Agency’s Light Detection and Ranging (LIDAR) system) to a 13.8 km(2) catchment in an upland environment identified large areas of saturated areas that remained unconnected from the drainage network even during an extreme flood event. This is shown to be a particular problem with using high resolution topographic data especially over large spatial scales. To deal with the hydrological consequences of disconnected areas, we present a simple network index modification in which saturated areas only connect when the topographic index is sufficient for there to be zero or negative saturation deficits along a complete flow path. This is combined with an enhanced method for dealing with the problem of pits and hollows which is shown to become more acute with higher resolution topographic data. The paper concludes by noting the implications of the research as presented for both methodological and substantive research that is currently under way.
|Copyright, Publisher and Additional Information:||Copyright © 2004 John Wiley & Sons, Ltd. This is an author produced version of an article published in Hydrological Processes|
|Keywords:||TOPMODEL, LIDAR, hydrological similarity, digital elevation models|
|Institution:||The University of Leeds|
|Academic Units:||The University of Leeds > Faculty of Environment (Leeds) > School of Geography (Leeds)|
|Depositing User:||Repository Officer|
|Date Deposited:||28 Jul 2006|
|Last Modified:||08 Jun 2014 19:09|