Video Monitoring of Shoreline Positions in Hujeong Beach, Korea
| Autor: | Jong Dae Do, Chang Hwan Kim, Weonmu Jeong, Yeon S. Chang, Jae-Youll Jin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Bedform
010504 meteorology & atmospheric sciences shoreline change 01 natural sciences lcsh:Technology lcsh:Chemistry General Materials Science Underwater Instrumentation lcsh:QH301-705.5 0105 earth and related environmental sciences coastal erosion Fluid Flow and Transfer Processes Shore geography geography.geographical_feature_category 010505 oceanography lcsh:T Process Chemistry and Technology General Engineering Shoal lcsh:QC1-999 Computer Science Applications Coastal erosion video monitoring Oceanography lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Submarine pipeline nearshore sandbars lcsh:Engineering (General). Civil engineering (General) Sediment transport Geology lcsh:Physics Accretion (coastal management) |
| Zdroj: | Applied Sciences, Vol 9, Iss 23, p 4984 (2019) Applied Sciences Volume 9 Issue 23 |
| ISSN: | 2076-3417 |
| Popis: | Shoreline processes observed by a video monitoring system were investigated under different wave conditions. A 30 m-high tower equipped with video cameras was constructed in Hujeong Beach, South Korea, where coastal erosion was suspected to occur. Two-year shoreline data since December 2016 showed that beach area, Ab, has decreased, but periods of rapid increase in Ab were also observed. Shoreline change was closely related to the wave propagation directions and bottom topography. Ab increased when waves approached the shore obliquely, whereas it decreased when they approached in a normal direction. The shoreline became undulated when Ab increased, while it became flatter when Ab decreased. The undulation process was influenced by nearshore bedforms because the shoreline protruded in the lee area where underwater rocks or nearshore sandbars actively developed, with a sheltering effect on waves. Specifically, the locations of shoreline accretion corresponded to the locations where the sandbar horns (location where a crescentic sandbar protrudes toward the shore) developed, confirming the out-of-phase coupling between sandbars and shoreline. When waves with higher energy approached normal to the shore, the sheltering effect of sandbars and underwater rocks became weaker and offshore sediment transport occurred uniformly along the coast, resulting in flatter shorelines. |
| Databáze: | OpenAIRE |
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