GEO DATA

Han Jun Woo

2 Articles

A Geological Environment Characteristics Dataset of Tidal Flat Surface Sediments: A 2021 Pilot Study of the Gomso Bay Tidal Flat Area to Use of Sediment Type Data: Kyoungkyu Park, Han Jun Woo, Hoi-Soo Jung, Joo Bong Jeong, Joo-Hyung Ryu, Jun-Ho Lee; GEO DATA. 2022;4(2):9-22. Published online June 30, 2022; DOI: https://doi.org/10.22761/DJ2022.4.2.002

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The Gomso Bay tidal flat is located between Buan-gun and Gochang-gun in Jeollabuk-do, Korea; it is a semi-closed bay in an area where tides prevail over waves. Tidal flats are mainly found south of Gochang-gun, and the main stream located north of the tidal flats is about 15 m deep and 900 m wide at low tide. Limited direct sampling is necessary for analyzing the geological environment of intertidal tidal flats, depending on the expected ebb-tide time and the number of survey items allowed for tidal flat access. This study assessed field measurement and laboratory analysis items for obtaining and establishing geological environment data to use of sediment type data in a pilot research area in the Gomso Bay tidal flat. Thirty sites were examined on June 22 and 24, 2021 (survey time about 3.5 hours for the 2 days). The field measurements were the sample date (year/month/day/hour/minute), ellipsoid height using a real-time kinematics global positioning system (RTK GPS) (m), shear strength (kg/cm²), and Munsell color. Samples for particle size (phi, Φ), specific density, porosity (%), moisture content (%), total organic carbon (%), total carbon (%) and total nitrogen (%) were placed in zipper bags and polypropylene (PP) bottles. The sedimentary phases were classified following Folk and Ward (1957), the organic matter was characterized based on particle size analysis and each experimental result was verified. In the future, a geological environment characteristics dataset based on this pilot study will be used as basic data to assess changes in the tidal flat topography and sedimentation environment. It should be useful data for research, tidal flat environment conservation management and free open data for users of related researchers.

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Characteristics of temporal-spatial variations of zooplankton community in Gomso Bay in the Yellow Sea, South Korea
Young Seok Jeong, Min Ho Seo, Seo Yeol Choi, Seohwi Choo, Dong Young Kim, Sung-Hun Lee, Kyeong-Ho Han, Ho Young Soh
Environmental Biology Research.2023; 41(4): 720. CrossRef

Topographic dataset of Gomso bay tidal flat: Deuk Jae Hwang, Kye Lim Kim, Yoon Kyung Lee, Jun-Ho Lee, Han Jun Woo, Joo Hyung Ryu; GEO DATA. 2020;2(2):18-25. Published online December 30, 2020; DOI: https://doi.org/10.22761/DJ2020.2.2.004

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Gomso bay tidal flat is influenced by human activity, such as Saemangeum dyke construction, Southwest sea offshore wind power plant construction, and reclamation. To observe continuous change of tidal flat topography, topographic change observation was carried out from Oct. 1991 to Oct. 2016. Gomso bay is located between latitude 35.5°N to 35.6°N and longitude 124.4°E to 126.7°E and elevation is measured at three transect located at tidal flat of outer bay, middle bay, and inner bay, respectively. RTK-GPS (Real time kinetic global positioning system) and sedimentation plate are used to measure elevation change of each transect. Line KM, which is located at outer bay tidal flat nearby Mandol-ri, has approximately 2 km distance from shoreline to lower intertidal zone and elevation is measured at 22 stations with RTK-GPS and sedimentation rate is measured at 10 stations with sedimentation plate. Line KH, which is located at middle bay tidal flat nearby Hajeon-ri, has approximately 5 km distance, and 50 stations and 20 stations are measured by RTK-GPS and sedimentation plate. Line KB, which has 1 km distance, approximately, and 10 stations and 9 stations are measured by RTK-GPS and sedimentation plate. Long term elevation change data is expected to predict long term elevation measurement data.

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A Geological Environment Characteristics Dataset of Tidal Flat Surface Sediments: A 2021 Pilot Study of the Gomso Bay Tidal Flat Area to Use of Sediment Type Data
Kyoungkyu Park, Han Jun Woo, Hoi-Soo Jung, Joo Bong Jeong, Joo-Hyung Ryu, Jun-Ho Lee
GEO DATA.2022; 4(2): 9. CrossRef

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