期刊
ADVANCES IN WATER RESOURCES
卷 30, 期 10, 页码 2151-2158出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.advwatres.2006.11.016
关键词
geographical information systems; GIS; digital elevation models; DEM; pit filling; depressions in DEMs; sinks in DEMs; errors in DEMs; landscape evolution models; drainage networks
Spurious pits in digital elevation models (DEMs) are traditionally removed by filling depressions, often creating flat regions that lead to inaccurate estimation of landscape flow directions. In this study, a physical approach based on a simple landscape evolution model is proposed for DEM pit removal. This method, an alternative to traditional geometrical procedures, enforces more realistic slopes and flow directions on topography. The procedure is compared with the method most commonly used in the literature and distributed with commercial GIs software where, generally, elevations of a depression are increased up to the lowest value among neighbouring cells. Several tests are performed and parameters sensitivity is carried out in order to demonstrate the performance of the proposed model as compared to traditional methods. (c) 2007 Elsevier Ltd. All rights reserved.
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