TITLE:
Case Study: Hydraulic Model Study for Abandoned Channel Restoration
AUTHORS:
Changsung Kim, Joongu Kang
KEYWORDS:
Abandoned Channel; Hydraulic Model; RMA2; FESWMS; Deposition
JOURNAL NAME:
Engineering,
Vol.5 No.12,
December
2,
2013
ABSTRACT: Recently, a paradigm of
river restoration is recognized as the importance of flood plan involving abandoned channel.
Hence, effort which abandoned channel area by improvement project will become
the territory of river area is trying. This study is a part of river
restoration project. In this study, hydraulic model experiment and numerical
simulation were performed to understand the flow characteristic and bed change
for abandoned channel restoration. The target area of the hydraulic model was
the midstream of the Hampyeong Stream (stream length: 1.3 km). Horizontal scale
was 1/50 and vertical scale was 1/40. For numerical simulation, the FESWMS
model was used. Cases of hydraulic and numerical models were frequency flood
discharge (50 and 100 years) and channel formation discharge (100 m3/s
and 120 m3/s). Flow characteristics were analyzed in fixed condition
using hydraulic and numerical models. Bed change on abandoned channel
restoration was analyzed on deposition trend using sediment supply from upstream in hydraulic
model, and was compared with results of bed shear stress in numerical model.
Results velocity profile and bed shear stress of numerical model were similar
with trends of measured velocity and deposition of hydraulic model. The results
of this study will be applied to restoration design of abandoned channels.