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Open AccessArticle

An Improved Method Constructing 3D River Channel for Flood Modeling

Northwestern Polytechnical University, Xi’an 710072, China
State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, China
Northwest Investigation Design & Research Institute, Xi’an 710065, China
Author to whom correspondence should be addressed.
Water 2019, 11(3), 403;
Received: 28 December 2018 / Revised: 15 February 2019 / Accepted: 16 February 2019 / Published: 26 February 2019
(This article belongs to the Special Issue Advances in Hydrogeology: Trend, Model, Methodology and Concepts)
The high-resolution topography is very crucial to investigate the hydrological and hydrodynamic process. To resolve the deficiency problem of high resolution terrain data in rivers, the Quartic Hermite Spline with Parameter (QHSP) method constructing the river channel terrain based on the limited cross-section data is presented. The proposed method is able to not only improve the reliability of the constructed river terrain, but also avoid the numerical oscillations caused by the existing constructing approach, e.g., the Cubic Hermite Spline (CHS) method. The performance of the proposed QHSP method is validated against two benchmark tests. Comparing the constructed river terrains, the QHSP method can improve the accuracy by at least 15%. For the simulated flood process, the QHSP method could reproduce more acceptable modeling results as well, e.g., in Wangmaogou catchment, the numerical model applying the Digital Elevation Model (DEM) produced by the QHSP method could increase the reliability by 18.5% higher than that of CHS method. It is indicated that the QHSP method is more reliable for river terrain model construction than the CHS and is a more reasonable tool investigating the hydrodynamic processes in river channels lacking of high resolution topography data. View Full-Text
Keywords: river channel; terrain construction; Quartic Hermite Spline with Parameter; DEM; hydrodynamic model river channel; terrain construction; Quartic Hermite Spline with Parameter; DEM; hydrodynamic model
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Hu, P.; Hou, J.; Zhi, Z.; Li, B.; Guo, K. An Improved Method Constructing 3D River Channel for Flood Modeling. Water 2019, 11, 403.

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