Evaluating preprocessing methods of digital elevation models for hydrological modelling

• DOI: 10.1002/hyp.11385
• Publication Date: 2017-10-21T14:52:37Z
• Authors: William Lidberg; Mats Nilsson; Tomas Lundmark; Anneli M. Ågren
• Keywords: Elevation (ballistics); Culvert; Digital mapping

Abstract With the introduction of high‐resolution digital elevation models, it is possible to use terrain analysis extract small streams. In order map streams correctly, necessary remove errors and artificial sinks in models. This step known as preprocessing will allow water move across a landscape. However, new challenges are introduced with increasing resolution because effect anthropogenic artefacts such road embankments bridges increases increased resolution. These problematic during they elevated above surrounding landscape act dams. The aims this study were evaluate different methods breaching filling on models resolutions (2, 4, 8, 16 m) which most accurately route impoundments at actual culvert locations. A unique dataset over 30,000 field‐mapped culverts was used assess accuracy stream networks derived from using methods. Our results showed that Breaching created accurate all resolutions, whereas least accurate. Burning topographic roads for resolutions. addition, impact terms change area absolute volume between original preprocessed smaller than filling. appropriate methods, extensive networks, thus providing forest managers can be when planning operations wet areas or near prevent rutting, sediment transport, mercury export.