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LarsH

Lars Harrie

Professor

LarsH

Digital elevation data for estimation of potential wetness in ridged fields - Comparison of two different methods

Författare

  • Petter Pilesjö
  • Andreas Persson
  • Lars Harrie

Summary, in English

The aim of this study was to develop, adjust and test two different methods for the estimation of drainage area and potential wetness in ridged fields. The methods were applied to a gridded digital elevation model (DEM) of a potato field in central Sweden. Elevation data were registered by a global positioning system (GPS) receiver. A high-precision real time kinematic (RTK) system was used to record positions both horizontally and vertically. The study can be divided into four parts. First, we present the two different methods of estimating the drainage area and potential wetness. The potential wetness index used is 1n(a/tan beta), which is directly related to drainage area. Second, we constructed a high-accuracy DEM based on GPS-measured elevation points. We then modelled the GPS errors and the sampling errors in the DEM. Finally, we used a Monte Carlo simulation to test differences between the two methods of estimating the drainage area and potential wetness. The wetness index for the new method, which takes ridges into account, differs both statistically and visually from the first method, which does not incorporate ridges. The new method, incorporating ridges, is thus strongly recommended for hydrological modelling in ridged agricultural fields. (c) 2005 Elsevier B.V. All rights reserved.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap

Publiceringsår

2006

Språk

Engelska

Sidor

225-247

Publikation/Tidskrift/Serie

Agricultural Water Management

Volym

79

Issue

3

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Physical Geography

Nyckelord

  • ridged fields
  • DEM
  • surface water modelling
  • topographic form
  • index
  • wetness

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 1873-2283