Late Quaternary depositional environmental changes from the middle part of Nakdong River delta core sediments

Ham, A.; Shin, Seungwon; Kim, Jin-Cheul; Jung, Sang-Yong; Sharma, Kapil; Cheong, Daekyo

doi:10.14770/jgsk.2018.54.1.47

Cited by 5 publications

(6 citation statements)

References 16 publications

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“…The maximum thickness of the sediments overlying the bedrock is approximately 80 m. Holocene sediments consist of a sandy layer (deltaic sediments) up to around 15 m below the ground surface, overlying the remaining layer, consisting of thick marine clay [14]. According to Ham et al [15], the study area was dominated by a fluvial environment during the late Pleistocene, due to low sea levels. Fluvial deposits, consisting of granular to fine sand and small amounts of gravel, were formed on top of the bedrock at a maximum observed depth of around 50 m. The sea level then gradually rose for a long period, leading to the formation of marine deposits containing a small amount of shells on top of the late Pleistocene fluvial deposits.…”

Section: Study Areamentioning

confidence: 99%

The Relationship between Bedrock Depth and Site Fundamental Frequency in the Nakdonggang Delta Region, South Korea

et al. 2023

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This paper describes the relationship between bedrock depth (D) and site fundamental frequency (f0) in the Nakdonggang delta region in the southeastern part of the Korean peninsula. We collected borehole logs to confirm the thickness of the sediments and estimated the f0 at over 200 locations across the delta using the horizontal-to-vertical spectral ratio (HVSR) method. We developed an f0 map of the study area by spatially interpolating the f0 values using the Ordinary Kriging method. The bedrock depth in the main delta showed a power-law dependence on the f0. The derived f0–D model predicted much shallower bedrock depths compared with similar studies from other parts of the world. This was attributed to the fact that the Nakdonggang delta region is composed of relatively low Vs Holocene sediments. With an f0 map, the derived model could enable a quick estimation of the bedrock depth, which could help to determine the site class in the Nakdonggang delta region according to the Korean Seismic Design Standard (KDS 17 10 00).

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Section: Study Areamentioning

confidence: 99%

The Relationship between Bedrock Depth and Site Fundamental Frequency in the Nakdonggang Delta Region, South Korea

et al. 2023

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“…The evolution of the Nakdong River delta sedimentary environments in response to Holocene sea-level change is analyzed by comparing the data of ND-3 sediments to those of OW-1 [21], ND-1 [18,37], ND-2 [18], and SSDP-102 [41] (Figure 6). The sea level was lowered by about 120 m below the present level before the LGM at 18 cal ka BP [42,43].…”

Section: Evolution History Of the Nakdong River Deltamentioning

confidence: 99%

“…Most of the study areas corresponding to the present delta plain were submerged by seawater, and the ND drilling sites were changed into a shallow marine where seawater invaded. However, since the OW-1 drilling site was not affected by seawater invasion due to its higher elevation than the ND area, it was influenced by the estuarine environment, which is affected both by land and seawater (Figures 6 and 7c) [21]. The Holocene began at 13-10 cal ka BP, when the sea level rose after the LGM to approximately 50 m below the present level [6,10,[44][45][46], and the sea-level curves of the Korea Peninsula show that at 10 cal ka BP the sea level was 30 m below the present level (Figure 8).…”

Section: Evolution History Of the Nakdong River Deltamentioning

confidence: 99%

Section: After 6 Cal Ka Bp (Progradation Phase)mentioning

confidence: 99%

“…Previous studies in the Nakdong River delta have mainly focused on the early delta initiation process based on the upstream sediments [15,19,20]. Moreover, the depositional environment changes have been studied based on the sedimentary characteristics of a series of drill cores: the OW-1 core sediments, located on the eastern side of the middle-upper area [21]; the ND-1 core sediments, located in the southwest delta plain [17,18]; the ND-2 core sediments [18], located in the sand bar of the downstream area of the Nakdong River delta (Figure 1). Recently, Jeong et al [22] interpreted the depositional environment change of the downstream core sediments (KND-3) since the LGM using description of the sedimentary facies.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of Depositional Environments in Response to the Holocene Sea-Level Change in the Lower Delta Plain of Nakdong River Delta, Korea

et al. 2021

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The Nakdong River delta, located in southeastern Korea, preserves thick and wide sediments, which are suitable for the high-resolution study of the evolution of depositional environments in the lower delta plain area. This study traces the Holocene evolution of the Nakdong River delta using deep drill core (ND-3; 46.60 m thick) sediments from the present delta plain. Sedimentary units of the sediments were classified based on grain size compositions and sedimentary structures: (A) alluvial zone, (B) estuarine zone, (C) shallow marine, (D) prodelta, (E) delta front, and (F) delta plain. The weathered sediment, paleosol, was observed at 43.16 m below the surface. There is an unconformity (43.10 m) to separate a Pleistocene sediment layer in the lowermost part differentiating from a Holocene sediment layer in the upper part of the core. The shallow marine sedimentary unit (32.20~23.50 m), in which grain size decreases upward is overlain by the prodelta unit (23.50~15.10 m), which consists of fine-grained sediments and relatively homogeneous sedimentary facies. The boundary between the delta front unit (15.10~8.00 m) and the delta plain unit (8.00~0.00 m) appears to lie at 8.0 m, and the variation in grain size is different; coarsening upward in the delta front unit and fining upward in the delta front unit, respectively. These sediments are characterized by a lot of sand–mud couplets and mica flakes aligned along with cross-stratification, which may be deposited in relatively high-energy environments. Until 13 cal ka BP, the sea level was 70 m below the present level and the drilling site might be located onshore. At 10 cal ka BP, the sea level was located 50 m below the present level and the drilling site might be moved to an estuarine environment. From 8 to 6 cal ka BP, a transgression phase occurred as a result of coastline invasion by the rapid rise of the sea level. Thus, the drilling site was drowned in a shallow marine environment. After 6 cal ka BP, the sea level reached the present level, and, since then, progradation might begin to form, primarily by more sediment input. After this period, the progradation phase continues as the sediments have advanced and the delta grows.

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Sedimentary evolution of the Nakdong River deposits on the Korea Strait shelf since the Last Glacial Maximum

Choi,

Kum,

Shin

et al. 2024

Marine Geology

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Late Quaternary depositional environmental changes from the middle part of Nakdong River delta core sediments

Cited by 5 publications

References 16 publications

The Relationship between Bedrock Depth and Site Fundamental Frequency in the Nakdonggang Delta Region, South Korea

The Relationship between Bedrock Depth and Site Fundamental Frequency in the Nakdonggang Delta Region, South Korea

Evolution of Depositional Environments in Response to the Holocene Sea-Level Change in the Lower Delta Plain of Nakdong River Delta, Korea

Sedimentary evolution of the Nakdong River deposits on the Korea Strait shelf since the Last Glacial Maximum

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