Stratigraphy and depositional history of Nakdong River Delta

유동근,; 이광수,; 강년건,; 이보연,; 공기수,; 김길영,; 장세원,; 이상헌,; 김진철,

doi:10.14770/jgsk.2017.53.5.619

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…The present delta plain in the Nakdong River delta is fairly flat and has an altitude of 0~6 m. The present upper delta plain is composed of natural levees and is mainly influenced by the river, and the present lower delta plain is mainly influenced by the sea and is composed of an intertidal zone, barrier islands, and a coastal plain (Figure 1b) [23,24]. The water depth of the present delta front that developed in the offshore is 0~20 m [23]. The tidal range in this area is 1.2 m in average and increases slightly westward [25].…”

Section: Regional Settingmentioning

confidence: 98%

“…The delta is distributed locally in an intertidal zone and contains various sand bar and barrier islands (e.g., Eulsukdo, Daemadeung, Jangjado, Sinjado, Jinwoodo, and Baekhapdeung) [27]. The present delta plain in the Nakdong River delta is fairly flat and has an altitude of 0~6 m. The present upper delta plain is composed of natural levees and is mainly influenced by the river, and the present lower delta plain is mainly influenced by the sea and is composed of an intertidal zone, barrier islands, and a coastal plain (Figure 1b) [23,24]. The water depth of the present delta front that developed in the offshore is 0~20 m [23].…”

Section: Regional Settingmentioning

confidence: 99%

“…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. Yoo et al [23] discussed the depositional history of the Nakdong River delta using grain size data, dating, and seismic profiles of the present prodelta core sediments (SSDP-102). [23] and Kwon.…”

Section: Introductionmentioning

confidence: 99%

“…Yoo et al [23] discussed the depositional history of the Nakdong River delta using grain size data, dating, and seismic profiles of the present prodelta core sediments (SSDP-102). [23] and Kwon. [24].…”

Section: Introductionmentioning

confidence: 99%

“…To achieve this aim, we describe the sedimentary facies, analyze the grain size, and the age of sediments. [23] and Kwon [24].…”

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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Section: Regional Settingmentioning

confidence: 98%

Section: Regional Settingmentioning

confidence: 99%