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| Titel |
Environmental change on tidal flat induced by anthropogenic effect around west coast of Korean Peninsula |
| VerfasserIn |
Yoon-Kyung Lee, Jong-Kuk Choi, Joo-Hyung Ryu, Jinah Eom |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250095745
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| Publikation (Nr.) |
 EGU/EGU2014-11213.pdf |
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| Zusammenfassung |
| Tidal flats are valuable ecosystem by a productive flora and fauna which support large
populations of birds, form nursery and feeding areas for coastal fisheries, provide intrinsic
values such as aesthetics and education (Costanza et al., 1997; Goodwin et al., 2001). The
half of the world’s coastal wetlands will submerge during this century in response to sea level
rise although salt marsh has a capacity to adjust to sea level rise change. However, tidal flats
have been changed because of several coastal construction projects that had not been
considered sustainable over the last 30 years in Korean Peninsula. The total area of tidal flats
decreased from approximately 2,800 km2 in 1990 to 2,393 km2 in 2005 due to the land
reclamations and dredging in South Korea. Many researchers investigated topography,
sedimentation changes and local hydrodynamics for this area in the early 1990s. However,
they are limited to the temporal and spatial scale because field surveys in the tidal flats are
restricted due to the difficulties in accessing. The aim of this study was to examine
environmental change in tidal flat in a large scale for long-term based on the remotely
sensed data as well as in situ measurements. This study focused on the tidal flat that
not only had been affected by reclamations on a large scale such as Ganghwa and
Saemangeum but also had been indirectly affected by reclamations such as Hwang-do and
Gomso-bay.
In this study, changes in morphology and sedimentary facies in tidal flats were estimated.
Digital elevation models (DEMs) in early 2000 and 2010 were generated based on the
Landsat TM/ETM+ images using a waterline method. Morphological change was estimated
based on the differences of DEMs and sedimentary facies was investigated based on the
calculation of image-derived PCA coefficient. Results of the morphological change in tidal
flats interestingly showed that large amount of areas had been deposited whereas the other
areas were eroded. Area with deposited tendency showed increase in fine sediments
whereas area with eroded tendency showed increase in coarse sediments. This result
was compared with the tidal current speed estimated from a hydrological model. |
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