Impacts of typhoon-induced heavy rainfalls and resultant freshwater runoff on the partitioning of organic carbon oxidation and nutrient dynamics in the intertidal sediments of the Han River estuary, Yellow Sea

2019 ◽  
Vol 691 ◽  
pp. 858-867 ◽  
Author(s):  
Jin-Sook Mok ◽  
Sung-Han Kim ◽  
Jonguk Kim ◽  
Hyeyoun Cho ◽  
Sung-Uk An ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Yellow Sea ◽  
Nutrient Dynamics ◽  
River Estuary ◽  
Carbon Oxidation ◽  
Intertidal Sediments ◽  
Han River ◽  
Han River Estuary ◽  
Organic Carbon Oxidation ◽  
Heavy Rainfalls

Rapid organic matter mineralization coupled to iron cycling in intertidal mud flats of the Han River estuary, Yellow Sea

2009 ◽  
Vol 92 (3) ◽  
pp. 231-245 ◽  
Author(s):  
Jung-Ho Hyun ◽  
Jin-Sook Mok ◽  
Hye-Youn Cho ◽  
Sung-Han Kim ◽  
Kwang Soo Lee ◽  
...  
Keyword(s):  
Organic Matter ◽  
Yellow Sea ◽  
River Estuary ◽  
Iron Cycling ◽  
Han River ◽  
Organic Matter Mineralization ◽  
Han River Estuary ◽  
Intertidal Mud Flats

Tidally Induced Changes in Bacterial Growth and Viability in the Macrotidal Han River Estuary, Yellow Sea

1999 ◽  
Vol 48 (2) ◽  
pp. 143-153 ◽  
Author(s):  
J.-H. Hyun ◽  
J.K. Choi ◽  
K.H. Chung ◽  
E.-J. Yang ◽  
M.-K. Kim
Keyword(s):  
Bacterial Growth ◽  
Yellow Sea ◽  
River Estuary ◽  
Han River ◽  
Han River Estuary ◽  
Induced Changes

scholarly journals Influence of Manila clam aquaculture on rates and partitioning of organic carbon oxidation in sediment of Keunso Bay, Yellow Sea

2020 ◽  
Vol 12 ◽  
pp. 91-103
Author(s):  
SH Kim ◽  
SU An ◽  
WC Lee ◽  
JS Lee ◽  
JH Hyun
Keyword(s):  
Organic Carbon ◽  
Yellow Sea ◽  
Anaerobic Respiration ◽  
Manila Clam ◽  
Carbon Oxidation ◽  
Labile Organic Matter ◽  
Sediment Reworking ◽  
Respiration Rates ◽  
Organic Carbon Oxidation ◽  
Extractable Iron

We investigated the effects of Manila clam aquaculture on the rates and pathways of anaerobic organic carbon (OC) oxidation in highly bioturbated (HB) and poorly bioturbated (PB) sediment in Keunso Bay, Yellow Sea. Due to the labile organic matter supply via sediment reworking by Manila clams, the anaerobic OC oxidation rate in HB sediment (38.8 mmol m-2 d-1) was ~1.5 times higher than that in PB sediment (26.8 mmol m-2 d-1). Microbial Fe(III) reduction (FeR) dominated OC oxidation pathways in HB sediment, comprising 55 to 76% of anaerobic OC oxidation, whereas sulfate reduction (SR) was the dominant oxidation pathway in PB sediment, accounting for up to 92% of anaerobic OC oxidation. Despite higher anaerobic respiration rates at the HB site, concentrations of NH4+, PO43-, oxalate-extractable iron (Fe(II)(oxal)), and total reduced inorganic sulfur were 2 to 3 times lower in HB than in PB sediment. Conversely, the concentration of reactive Fe(III)(oxal) at the HB site (2243 mmol m-2) exceeded that at the PB site (1127 mmol m-2) by a factor of 2. These results indicate that bioturbation by Manila clams enhances the re-oxidation processes of reduced metabolites in the sediment, thereby prohibiting SR and promoting FeR. Overall, the results suggest that aquaculture activities of Manila clams shift the dominant OC oxidation pathways in sediment from SR to FeR, which generates relatively oxidized and less sulfidic environments.

Organic carbon oxidation and preservation in NW Atlantic continental margin sediments

1987 ◽  
Vol 31 (1) ◽  
pp. 215-236 ◽  
Author(s):  
D. Heggie ◽  
C. Maris ◽  
A. Hudson ◽  
J. Dymond ◽  
R. Beach ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Continental Margin ◽  
Carbon Oxidation ◽  
Organic Carbon Oxidation

scholarly journals Avian Surveys in the Korean Inner Border Area, Gimpo, Republic of Korea

2020 ◽  
Vol 8 ◽  
Author(s):  
Hyun-Ah Choi ◽  
Bernhard Seliger ◽  
Nial Moores ◽  
Amaël Borzée ◽  
Chong Hwi Yoon
Keyword(s):  
River Estuary ◽  
Bird Species ◽  
Environmental Indicators ◽  
Republic Of Korea ◽  
World Population ◽  
Survey Area ◽  
Han River ◽  
Waterbird Species ◽  
Bean Goose ◽  
Han River Estuary

Birds are useful environmental indicators as their presence reflects the health of the food web. Bird occurrence, rarity and abundance are reliable indicators of ecosystem health. Monitoring of avian populations in the Republic of Korea (ROK) is a primary requirement due to plummeting populations and the risks to threatened species. The Ministry of Environment of ROK started conducting winter bird censuses in 1999, including inland areas and coast areas, such as Cheorwon, Yeoncheon, Junam Reservoir and Han River. Cheolwon, Yeoncheon and some extent islands in the West Sea have been survey extensively due to iconic bird species, such as White-naped Crane (Grus vipio) or Red-Crowned Crane (Grus japonensis) wintering there. However, the winter bird census has not covered Yu Islet, Han River Estuary. Yu Islet is located within the Han River Estuary, a protected wetland in the Neutral Zone between the two Koreas and north of Gimpo in the ROK. The Islet currently supports a large, mixed breeding colony of waterbirds, such as one of the nation’s largest concentration of breeding Great Cormorants (Phalacrocorax carbo) and smaller numbers of breeding Black-faced Spoonbill (Platalea minor), Grey Heron (Ardea cinereal), Great Egret (Ardea alba) and Intermediate Egret (Ardea intermedia). Access to the area has long been restricted for military reasons, but recently, regular survey activity is possible supported by Gimpo City and the military base in Gimpo from November 2018. Here, we provide data demonstrating that Yu Islet is important for breeding for waterbirds; and that the northern Gimpo part of Han River Estuary is also internationally important for waterbirds during the migratory bird season, as defined by the Ramsar Convention (Ramsar 1971, RRC-EA 2017). In particular, four waterbird species were found during the survey in the Main Survey Area: Swan Goose (Anser cygnoides), Taiga Bean Goose (Anser fabalis), Tundra Bean Goose (Anser serrirostris) and Greater White-fronted Goose (Anser frontalis). Once considered widespread in East Asia and abundant, the world population of Swan Goose is now estimated at only 60,000 - 78,000 individuals (Wetlands International 2020) and the species is assessed by BirdLife International as globally Vulnerable (BirdLife International 2020). The 1,010 Swan Goose (Anser cygnoides) counted on the vegetated mudflats at Jogang-Ri in the Main Survey Area on 27 November 2018 represents more than 1% of the total world population of this species. Notably, it is also the highest count of this species in the ROK for at least a decade. The count confirms the continuing international importance of the Han River Estuary for the survival of the Swan Goose. The number counted in November had fallen to 250 by 28 December 2018; and none was recorded in the Main Survey Area in January or February 2019. Although searched for in March, none was noted during the northward migration either. The surveys also found small numbers of nationally-scarce Grey-capped Pygmy Woodpecker (Yungipicus canicapillus) in several areas of woodland surrounded by the Han River Estuary. By selecting the most species-rich count within a given month in each of the two survey sectors, the number of species we recorded ranged from a minimum 29 in January to a maximum of 65 in April 2019. Based on the species recorded, the survey area is clearly important for avian conservation. Its importance derives from the combination of the extensive areas of high-quality wetland and its geographic location within one of the Korea Peninsula’s largest and most important remaining wetland ecosystems, the Han River Estuary. Our surveys resulted in the detection of a substantial number of bird species, especially in March and April when forest-breeding birds are more obviously vocal. The survey result is provided in the supplementary material (Suppl. material 1).

The Regional Classification of Tidal Regime using Characteristics of Astronomical Tides, Overtides and Compound Tides in the Han River Estuary, Gyeonggi Bay

2015 ◽  
Vol 27 (3) ◽  
pp. 149-158 ◽  
Author(s):  
Byung Il Yoon ◽  
Seung-Buhm Woo ◽  
Jong Wook Kim ◽  
Jin Il Song
Keyword(s):  
River Estuary ◽  
Tidal Regime ◽  
Han River ◽  
Han River Estuary
Sign in / Sign up

Export Citation Format

Share Document