CATCHMENT AREA DERIVATION FROM GRIDDED DIGITAL ELEVATION MODELS USING THE FLOWLINE-TRACING APPROACH
Abstract
Hydrological terrain analysis on the basis of the digital elevation models is an important part of GIS-based geomorphometry. Hydrological parameters, such as the catchment area or flow accumulation, are frequently used in geographical studies, both directly and indirectly. Their computation is based on the determining of water flow through the regular grid of digital elevation model (DEM). There are many algorithms developed for this procedure, and their application gives extremely different computation results for the catchment area. All these algorithms apply a discrete, «cell-to-cell» flow
conception. This, first, does not adequately represent real water movement, and, second, makes it difficult to verify results, because cells of a regular grid do not usually «suit» to the landforms.
The paper presents a new approach for catchment area and flow accumulation computation. It is based on flowline tracing on a continuous surface. The surface could be obtained through interpolation of discrete elevation values from a regular grid of DEM.
About the Authors
S. M. Koshel
Lomonosov Moscow State University
Russian Federation
Russian Federation
Faculty of Geography, Department of Cartography and Geoinformatics, Leading Scientific Researcher, PhD. in Geography
A. L. Entin
Lomonosov Moscow State University
Russian Federation
Faculty of Geography, Department of Cartography and Geoinformatics, postgraduate student
Russian Federation
Faculty of Geography, Department of Cartography and Geoinformatics, postgraduate student
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Review
For citations:
Koshel S.M., Entin A.L. CATCHMENT AREA DERIVATION FROM GRIDDED DIGITAL ELEVATION MODELS USING THE FLOWLINE-TRACING APPROACH. Vestnik Moskovskogo universiteta. Seriya 5, Geografiya. 2017;(3):42-50. (In Russ.)
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