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Water 2017, 9(4), 283; doi:10.3390/w9040283

Possibilities of Using Low Quality Digital Elevation Models of Floodplains in Hydraulic Numerical Models

1
Institute of Construction and Geoengineering, Poznań University of Life Sciences, Piątkowska 94, 60-649 Poznań, Poland
2
Institute of Land Improvement, Environment Development and Geodesy, Poznań University of Life Sciences, Piątkowska 94, 60-649 Poznań, Poland
*
Author to whom correspondence should be addressed.
Academic Editors: Gordon Huang and Yurui Fan
Received: 29 December 2016 / Revised: 23 March 2017 / Accepted: 13 April 2017 / Published: 21 April 2017
(This article belongs to the Special Issue Modeling of Water Systems)
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Abstract

The paper presents a method for the correction of low quality DEMs, based on aerial photographs, for use in 2D flood modeling. The proposed method was developed and tested on the example of the floodplain of the Warta River, which is the third biggest river in Poland. The correction of DEM is based on a series of a small number of measurements using GPS-RTK, which enable calculations of the global statistics like mean error (ME), root mean square error (RMSE) and standard deviation (SD). The impact of DEM accuracy was estimated by using a 2D numerical model. The calculated values of flow velocities, inundation area and volume of floodplain for each tested DEM were compared. The analyses indicate that, after the correction procedure, the predictions of corrected DEM based on poor quality data is in good quantitative and qualitative agreement with the referenced LIDAR DEM. The proposed method may be applied in the areas for which high resolution DEMs based on LIDAR data are not available. View Full-Text
Keywords: DEM; accuracy; hydraulic modeling; flood inundation DEM; accuracy; hydraulic modeling; flood inundation
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Laks, I.; Sojka, M.; Walczak, Z.; Wróżyński, R. Possibilities of Using Low Quality Digital Elevation Models of Floodplains in Hydraulic Numerical Models. Water 2017, 9, 283.

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