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NUMERICAL ESTIMATION OF PUMP STATIONS
EFFECTS UNDER HEAVY RAINFALL
IN LOW-LYING AREA USING INUNDATION
FLOW ANALYSIS
KENJI KAWAIKE
∗
, HIROTATSU MARUYAMA and MASATO NOGUCHI
Department of Civil Engineering, Nagasaki University
1-14, Bunkyo-machi, Nagasaki, Japan
∗
kawaike@civil.nagasaki-u.ac.jp
In this study, a comprehensive inundation flow model, which comprises one-
dimensional unsteady flow model, two-dimensional inundation flow model
and runoff model, is developed and applied to the Isahaya low-lying area,
Japan. A numerical simulation using the observed rainfall data of 1999 is
conducted, and good agreement between the simulation result and actual
inundated area is obtained. Then, as the application example of this model,
the effect by extending pump capacity on the inundated area is dis-
cussed by estimating the relationship between additional pump capacity and
inundated area.
1. Introduction
Recently in Japan, flood disasters due to heavy rainfall occur frequently in
highly urbanized area. As the countermeasures against this kind of disas-
ters, not only structural countermeasures but also nonstructural ones are
adopted. As an example, “hazard maps” for flood disasters are published
from many local governments in Japan, which includes both potential dan-
gerous areas for flood disasters by using numerical simulation and evac-
uation information such as shelters and evacuation routes. Therefore, an
accurate simulation model of inundation flow analysis becomes more nec-
essary as one of the countermeasures against flood disasters.
In this study, a numerical model, which can simulate inundation flow
due to heavy rainfall, is proposed and applied to the Isahaya low-lying
area, Japan. As the practical application example of this model, the effect
of hypothetical pump capacity on inundated area is discussed.
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