GEO DATA

Data Articles

Comparative Analysis of Blue Carbon Stock in Coastal Watersheds of Four Major Rivers: Bongseok Jeong, Sunmin Lee, Moung-jin Lee; Received February 26, 2025 Accepted March 26, 2025 Published online April 29, 2025; DOI: https://doi.org/10.22761/GD.2025.0008 [Epub ahead of print]

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Abstract PDF: Global attention to blue carbon, which absorbs significant amounts of carbon, has increased as an alternative solution for reducing greenhouse gases, a major concern in the international community. However, as blue carbon is threatened by land cover changes and sea-level rise, preliminary studies on assessment and restoration have been conducted for efficient management. While domestic research has focused on field surveys of carbon absorption capacity and storage, studies establishing spatial information systems have been limited. Therefore, this study developed blue carbon spatial information for the coastal watersheds of the four major rivers. Total carbon storage within watersheds was calculated based on data from field surveys of 21 domestic tidal flats and various tidal flat spatial information datasets (global distribution of tidal flat ecosystems, Subdivision land cover map, 1/25,000 coastal data and 2018 tidal flat data). Watershed health indices were calculated based on total carbon storage. The carbon storage per unit area was highest in the Han River coastal watershed, followed by Nakdong, Geum, and Yeongsan River Coastal Watersheds. Among the various tidal flat spatial information datasets applied, analysis revealed that the highest carbon storage values were found in Han (7,321,321.72 Mg C, Nakdong (197,943.19 Mg C), Geum (469,228.90 Mg C), and Yeongsan (2,849,389.2 Mg C) River Coastal Watersheds. The health index analysis comparing various tidal flat spatial information datasets indicated peak values in Han (54.12), Nakdong (82.92), Geum (75.40), and Yeongsan (59.58) River Coastal Watersheds. The blue carbon spatial information developed in this study can potentially support policy decision-making and future research utilizing spatial information, such as analyzing factors affecting blue carbon absorption rates.

Study on Grain Size, Physical Properties and Organic Matter Characteristics of Tidal Flat Surface Sediments: May 2022 Hwangdo Tidal Flat Dataset, Cheonsu Bay: Jun-Ho Lee, Hoi-Soo Jung, Huigyeong Ryu, Keunyong Kim, Joo-Hyung Ryu, Yeongjae Jang; GEO DATA. 2024;6(3):159-174. Published online September 30, 2024; DOI: https://doi.org/10.22761/GD.2024.0011

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Abstract PDF: This study analyzes the geological and geochemical features of surface sediments in the Hwangdo Tidal Flat, located on Korea’s West Coast. The tidal flat experiences semi-diurnal tides, impacting organic matter decomposition and nutrient cycling. Ninety one sediment samples were collected and analyzed for physical and chemical properties including grain size, density, water content, organic carbon, and nitrogen. Sediments consist mainly of sand and silt, with coarser sediments near the main channel and finer sediments towards the west. Sediment grain size averages 4.12 Φ with a sorting coefficient of 1.96 Φ, indicating diverse energy environments. Total organic carbon and nitrogen correlate positively with grain size and density, reflecting sediment origin and environment. Kriging maps sediment grain size distribution, while correlation and linear regression analyses show relationships between variables. High correlations exist between various parameters, aligning with tidal flat characteristics and aiding understanding of sediment transport and deposition. The study provides baseline data for understanding the tidal flat’s geological, geochemical, and physical aspects, valuable for remote sensing validation and environmental monitoring. The dataset is freely available for research and management purposes.

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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Study on Grain Size, Physical Properties and Organic Matter Characteristics of Tidal Flat Surface Sediments: May 2022 Hwangdo Tidal Flat Dataset, Cheonsu Bay
Jun-Ho Lee, Hoi-Soo Jung, Huigyeong Ryu, Keunyong Kim, Joo-Hyung Ryu, Yeongjae Jang
GEO DATA.2024; 6(3): 159. CrossRef
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

UAV Photogrammetry and LiDAR Based Dataset of Spartina anglica Distribution and High-resolution Topographic Map in Ganghwado: Keunyong Kim, Yeongjae Jang, Jingyo Lee, Joo-Hyung Ryu; GEO DATA. 2022;4(2):1-8. Published online June 30, 2022; DOI: https://doi.org/10.22761/DJ2022.4.2.001

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The Spartina anglica in the tidal flat at the southern part of Ganghwado, it is known that the distribution area has gradually expanded since it was officially announced as invasive alien species in 2015. The government and local governments are continuing their efforts to remove the S. anglica, and for this, continuous distribution change monitoring is required. This study extracted the data of distribution and extent area of S. anglica from Zenmuse P1 sensor, and generated the high-resolution Digital Elevation Model (DEM) from Zenmuse L1 sensor. Optical and Lidar images were photographed at an altitude of 70 m, and Ground Sampling Distance (GSD) of optical images was obtained at 0.9 cm and GSD of lidar images at 5 cm spatial resolution. However, the data are resampled and provided in GSD 25 cm to comply with the "National Spatial Information Security Management Regulations of the Ministry of Land, Infrastructure and Transport" and "Security Business Regulations of the National Intelligence Service".

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Optimization of a multi-sensor satellite-based waterline method for rapid and extensive tidal flat topography mapping
Jingyo Lee, Keunyong Kim, Geun-Ho Kwak, Won-Kyung Baek, Yeongjae Jang, Joo-Hyung Ryu
Estuarine, Coastal and Shelf Science.2025; 318: 109235. CrossRef
Spartina anglica-Derived Carbon-Coated PE Separator for Physically Restraining Polysulfide Migration in Lithium-Sulfur Batteries
Ye Jin Jeon, Yuna Ha, Jang Kyun Kim, Youn-Jung Kim, Taeeun Yim
Korean Journal of Chemical Engineering.2024; 41(4): 1187. CrossRef

The Dataset of UAV Based High-resolution Tidal Topography at the Nakdong Estuary: Focusing on Jin-u Island and Shin-ja Island: Yeongjae Jang, Jingyo Lee, Joo-Hyung Ryu, Kye-Lim Kim, Hahn Chul Jung, Keunyong Kim; GEO DATA. 2022;4(1):27-36. Published online March 31, 2022; DOI: https://doi.org/10.22761/DJ2022.4.1.003

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In the tidal flats of the Nakdong Estuary, eight weirs were installed as part of the Four Major River Restoration Project in 2011, and the environment changed from a flowing stream to a still water stream. As the Nakdong River’s weir was permanently opened in February 2022, the topography and ecological environment are expected to large change. In this study, Unmanned Aerial Vehicle (UAV) photogrammetry was conducted on the tidal flats of the Nakdong Estuary in November 2021, the environment before the Nakdong River floodgates were opened. The study area was surveyed using the Network-RTK (Real-Time Kinematic) method to obtain Ground Control Point (GCP), and using an UAV, orthographic image and digital elevation model were generated for an area of 3.47 ㎢ near Jin-u island and 2.75 ㎢ near Shin-ja island. A result of spatial resolution of 1.8 cm was obtained, the result was verified using checkpoints, and results with accuracy exceeding 1 cm were obtained in both Sin-u Island and Jin-woo Island. In the future, changes in the topography and sedimentation environment of this area are expected, so it will be useful data for various research and conservation management.

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Optimization of a Multi-Sensor Satellite-Based Waterline Method for Rapid and Extensive Tidal Flat Topography Mapping
Jingyo Lee, Keunyong Kim, Geun-Ho Kwak, Won-Kyung Baek, Yeongjae Jang, Joo-Hyung Ryu
Estuarine, Coastal and Shelf Science.2025; : 109235. CrossRef
Influence of Precipitation Conditions and Discharge Rates of River Estuary Barrages on Geomorphological Changes in an Estuarine Area
Sung-Bo Kim, Doo-Pyo Kim
Applied Sciences.2023; 13(17): 9661. CrossRef

The Dataset of Sedimentary Environments at Hwangdo Tidal Flat on the Western Coast of Korea (2004 to 2013): Kye-Lim Kim, Jong-Kuk Choi, Joo-Hyung Ryu; GEO DATA. 2020;2(2):26-35. Published online December 30, 2020; DOI: https://doi.org/10.22761/DJ2020.2.2.005

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Abstract PDF: The Hwangdo tidal flat has been subjected to local hydrodynamic changes caused by the construction of seawalls and bridges, which are changing the distribution of sediments and topographic characteristics. These changes would affect the sedimentary environments. It is essential to establish sedimentary environments dataset such as sediment distributions and elevation in order to understand the sedimentary environments and the pattern of change in the tidal flat. Therefore, between 2004 and 2013, data on sedimentary environmental factors such as surface sedimentary facies and elevation were obtained through the field survey, and soil moisture content of each sediment was measured to analysis the correlation between seawater and optical reflectance in the tidal flat. As a result, 12 sedimentary facies were distributed in the Hwangdo tidal flat, and the sand content and elevation gradually increased between 2004 and 2013. It was also shown that the amount of seawater present in the surface decreased as elevation and grain size increased. These data will be useful for understanding the changes in the sedimentary environments and for establishing plans for change and conservation management in Hwangdo tidal flat.

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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Citations to this article as recorded by

Study on Grain Size, Physical Properties and Organic Matter Characteristics of Tidal Flat Surface Sediments: May 2022 Hwangdo Tidal Flat Dataset, Cheonsu Bay
Jun-Ho Lee, Hoi-Soo Jung, Huigyeong Ryu, Keunyong Kim, Joo-Hyung Ryu, Yeongjae Jang
GEO DATA.2024; 6(3): 159. CrossRef
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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