m onitoring of topographic change on the coastal area
DESCRIPTION
M onitoring of topographic change on the coastal area . Jinah Eom 1,2 , Jong-Kuk Choi 1 , Joo-Hyung Ryu 1 , Joong -Sun Won 2 1 Korea Ocean Satellite Center, Korea Ocean Research & Development Institute ([email protected]) 2 Department of Earth System Sciences, Yonsei University . - PowerPoint PPT PresentationTRANSCRIPT
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
2. Study area
4. Results
5. Conclusion
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 monitoring using re-motely
sensed data
Observed a topography through sur-
vey
Propose integrated management meth-
ods for the utilization 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 lineExtracted 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 changeDEM2008 : topographical height in 2008DEM2010 : 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