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JDR Vol.15 No.3 pp. 335-343
(2020)
doi: 10.20965/jdr.2020.p0335

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Improving River Bathymetry and Topography Representation of a Low-Lying Flat River Basin by Integrating Multiple Sourced Datasets

Seemanta Sharma Bhagabati*,†, Akiyuki Kawasaki*, Wataru Takeuchi**, and Win Win Zin***

*Department of Civil Engineering, The University of Tokyo
7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

†Corresponding author

**Industrial Institute of Science, The University of Tokyo, Tokyo, Japan

***Yangon Technological University, Yangon, Myanmar

Received:
August 9, 2019
Accepted:
February 27, 2020
Published:
March 30, 2020
Creative Commons License
Keywords:
Digital Elevation Model (DEM), cross-section survey, river bathymetry, topography, Myanmar
Abstract

Topography represented in the form of Digital Elevation Models (DEMs) has profound applications in hydrological modeling. DEMs can be generated from several sources including satellite products, contours, survey data, and LiDAR, each with their own merits and demerits. Where high resolution, accuracy, and spatial extent are concerned, it is often found that a DEM from one source alone is not able to represent the topography of the target area with full accuracy. Upon comparing different DEMs, it was found that most were able to successfully represent mountainous regions but failed to represent flat deltaic regions. Therefore, in this research with Bago River basin, Myanmar as a study area, a new methodology to combine multiple sources of data with different data types is developed. The inputs are: (a) a 10 m DEM, developed using contour data, point elevation data, and UTM topographic maps; (b) a 5 m Digital Surface Model (DSM) acquired by the Advanced Land Observation Satellite (ALOS); and (c) 168 sets of multiple-point elevation data representing a cross-sectional survey along the Bago River and the Bago-Sittaung canal. The output is a 10 m resolution Enhanced DEM (EnDEM) which is able to preserve the merits of all the input data, i.e., upper mountainous region, lower flat deltaic basin, and the river bathymetry. This paper provides a novel approach to DEM integration and burning of the river cross-section onto the DEM.

Cite this article as:
S. Bhagabati, A. Kawasaki, W. Takeuchi, and W. Zin, “Improving River Bathymetry and Topography Representation of a Low-Lying Flat River Basin by Integrating Multiple Sourced Datasets,” J. Disaster Res., Vol.15 No.3, pp. 335-343, 2020.
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