IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
spacer.gif
spacer.gif eLibrary
spacer.gif eLibrary
You are here : eLibrary : IAHR Asia Pacific Division Proceedings : 19th IAHR APD Congress, Hanoi 2014 : Session 1: ENVIRONMENTAL HYDRAULICS : A FLOW SIMULATION OF A BRIDGE-INDUCED FLOOD IN A RIVER USING SMOOTHED-PARTICLE HYDRODYNAMICS (SPH) M...
A FLOW SIMULATION OF A BRIDGE-INDUCED FLOOD IN A RIVER USING SMOOTHED-PARTICLE HYDRODYNAMICS (SPH) METHOD
Author : N. KIMURA (1), & A. TAI (1)
Extreme weather has occurred more frequently worldwide over the last decade because of climate change. Therefore, at times, very heavy rains have caused severe flooding in the world. There have been reports of uncommon floods (such as flooding caused by the substantial accumulation of driftwood or debris) at a bridge in mountainous areas in southern Japan. To reduce a flood-induced disaster of this kind, it is necessary to better understand the flood mechanism. In this study, smoothed particle hydrodynamics method was employed to simulate flooding in the two-dimensional vertical plane. The method could reveal the physical processes of a driftwood-induced flood event at a river bridge. As the first step, we focused only on the effect of a bridge on water flow without driftwood. Open software, SPHysics implementing smoothed particle hydrodynamics method, was calibrated with data of water level recorded at a miniature bridge in our laboratory experiment. Like the laboratory experimental result, the calibrated simulation result clearly showed that the flow was divided into a top surface flow above the bridge girder and an undersurface flow below the bridge girder and the water level gradually was raised in an upstream direction from the bridge. In addition, using the SPHysics, we assessed how the bridge characteristics (for example, the width and thickness of the bridge girder and the spacing of cross sections) affect the intensity of flooding. A shorter thickness and lower position of the bridge girder caused larger dam-up water levels. This suggests that there is potential flooding at a bridge even without driftwood.
File Size : 5,046,271 bytes
File Type : Microsoft Word Document
Chapter : IAHR Asia Pacific Division Proceedings
Category : 19th IAHR APD Congress, Hanoi 2014
Article : Session 1: ENVIRONMENTAL HYDRAULICS
Date Published : 09/03/2015
Download Now