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Monitoring of topographic change on the coastal area Monitoring of topographic
change on the coastal area
Jinah Eom1,2, Jong-Kuk Choi1, Joo-Hyung Ryu1, Joong-Sun Won2
1 Korea Ocean Satellite Center, Korea Ocean Research & Develop-
ment Institute ([email protected])2 Department of Earth System Sciences, Yonsei University
Contents
1. Introduction & Objective 1. Introduction & Objective
2. Study area 2. Study area
4. Results 4. Results
5. Conclusion 5. Conclusion
3. Data & Method 3. Data & Method
1. Introduction
1. Introduction
Since the 1980’s, a series of
construction projects for land
reclamation have been carried
out on a large scale in western
sea
Land reclamation combined
with the dynamics of tidal cur-
rents accelerated local sedi-
mentation and erosion, result-
ing in the fast reformation of in-
tertidal topography
For this reason, Lee et al
(2006), Ryu et al (2008), and so
on were carried out monitoring
of tidal flat topography using
Digital Elevation Model
(Lee et al, 2011)
1. Introduction
The Nakdong River Estuary Barrage (NREB) was
constructed in 1987 to prevent saltwater intru-
sion and to provide the sustainable water supply
in the upstream channel of the NREB.
Fluvial changes and sedimentation problems
have been continued due to urbanization and
development in the watershed as well as con-
struction and management (sediment dredging)
of the NREB
1. Introduction
1. Introduction
The importance of the east sea to key industries, such as
nuclear power plants, shipyards, and cement production,
and to a lesser extent the fishing and leisure industries,
is gradually increasing
However, coastal erosion in east sea is being acceler-
ated so that the size of the sandy beach is being re-
duced abruptly along with a lots of other places includ-
ing Jugbyeon, Bongpyeong beach, Sanpo-ri, Weonnam,
Osan, Deogsin, and Hupo in Uljin-gun.
Objective
Long-term monitor-ing using remotely
sensed data
Observed a to-pography
through survey
Propose integrated manage-ment methods for the utiliza-
tion and preservation of coastal seas in the near future
Final goal
In this study
2. Study area
3. Data
Remotely sensed data
Change of sandbar : used Landsat ETM+ image from
2002 to 2010
Monitoring of shoreline change : used aerial photograph,
IKONOS, KOMPSAT-1/2 from 1971 to 2009
Monitoring of topography : used aerial LiDAR data and
terrestrial LiDAR at 2008, 2010
In situ data – used DGPS
Date : May. 2008., Jun. 2010
For comparison with Lidar data
Location of 2nd grade measurement survey benchmarks within KORDI-ESRI
Method –extract line
Extracted shoreline and sandbar estimate the reflectance of
sand and sea dry sand reflectance is
very strong Near 750 nm : sea is ab-
sorption but sand is re-flectance
Sea is dark color but sand is bright color
used NIR band
Method – LiDAR DEM
LiDAR – generated DEM data
DEMchange = DEM2008 – DEM2010
DEMchange : topographical change
DEM2008 : topographical height in 2008
DEM2010 : topographical height in 2010
Positive : represents erosionNegative : sedimentation
Results 1 - sandbar
Nakdong River Estuary Barrage (NREB) was constructed in 1987
After that, current rate and sedimentation rate were changed
Nakdong river is a major source of sedimentation of sandbar
Tide height
2003.11.02 : 68 cm
2010.11.05 : 71 cm