Abstract
Abstract. These The present study aims to simulate the hydrologic processes of a flood, based on a new, highly accurate Digital Elevation Model (DEM). The DEM is provided by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) of Japan, and has a spatial resolution of five meters. It was generated by the new National Project in 2012. The Hydrologic Engineering Center - Hydrologic Modeling System (HEC-HMS) is used to simulate the hydrologic process of a flood of the Onga River in Iizuka City, Japan. A large flood event in the typhoon season in 2003 caused serious damage around the Iizuka City area. Precise records of rainfall data from the Automated Meteorological Data Acquisition System (AMeDAS) were input into the HEC-HMS. The estimated flood area of the simulation results by HEC-HMS was identical to the observed flood area. A watershed aggregation map is also generated by HEC-HMS around the Onga River.
Highlights
Disasters such as floods in the typhoon season cause severe damage in Japan every year (Chan, 2013)
The hydrologic processes of a flood are simulated by the Hydrologic Engineering Center - Hydrologic Modeling System (HEC-HMS) (USACE, 2010) to estimate the flood area depending on rainfall
The present simulation results by HEC-HMS and Geographic Information System (GIS) are consistent with the past flood event in the Onga River in Iizuka City in 2003
Summary
Disasters such as floods in the typhoon season cause severe damage in Japan every year (Chan, 2013). A large flood event occurred on July 19, 2003, around the Onga River in Iizuka City, Japan. At this time, the flood area was not estimated. A highly accurate DEM provided by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) of Japan is used. It has a spatial resolution of five meters, and was generated by the new National Project in 2012 (Mori, 2011). It has become highly accurate compared with past aerial photogrammetry. There are steep geographical features in Japan, so an accurate DEM is needed for the hydrologic analysis of a flood
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