Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1002/hyp.10918
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Title (Primary) Delineating floodplain and upland areas for hydrologic models - A comparison of methods
Author Rathjens, H.; Bieger, K.; Chaubey, I.; Arnold, J.G.; Allen, P.M.; Srinivasan, R.; Bosch, D.D.; Volk, M.
Journal Hydrological Processes
Year 2016
Department CLE
Volume 30
Issue 23
Page From 4367
Page To 4383
Language englisch
Keywords landscape units; watershed discretization; hydrological modeling; DEM; terrain analysis; SWAT
UFZ wide themes RU1
Abstract A spatially distributed representation of basin hydrology and transport processes in hydrologic models facilitates the identification of critical source areas and the placement of management and conservation measures. Floodplains are critical landscape features that differ from neighboring uplands in terms of their hydrological processes and functions. Accordingly, an important step in watershed modeling is the representation of floodplain and upland areas within a watershed. The aim of this study is (1) to evaluate four floodplain-upland delineation methods that use readily available topographic data (topographic wetness index, slope position, uniform flood stage, and variable flood stage) with regard to their suitability for hydrological models and (2) to introduce an evaluation scheme for the delineated landscape units. The methods are tested in three U.S. watersheds ranging in size from 334 to 629 km2 with different climatic, hydrological and geomorphological characteristics. Evaluation of the landscape delineation methods includes visual comparisons, error matrices (i.e. cross-tabulations of delineated versus reference data), and geometric accuracy metrics. Reference data was obtained from SSURGO (Soil Survey Geographic database) and FEMA (Federal Emergency Management Agency) flood maps. Results suggest that the slope position and the variable flood stage method work very well in all three watersheds. Overall percentages of floodplain and upland areas allocated correctly were obtained by comparing delineated and reference data. Values range from 83 to 93 % for the slope position and from 80 to 95 % for the variable flood stage method. Future studies will incorporate these two floodplain-upland delineation methods into the subwatershed-based hydrologic model SWAT to improve the representation of hydrological processes within floodplain and upland areas. This article is protected by copyright. All rights reserved.
Persistent UFZ Identifier
Rathjens, H., Bieger, K., Chaubey, I., Arnold, J.G., Allen, P.M., Srinivasan, R., Bosch, D.D., Volk, M. (2016):
Delineating floodplain and upland areas for hydrologic models - A comparison of methods
Hydrol. Process. 30 (23), 4367 - 4383