Impacts of Climate Change Scenarios on Non-Point Source Pollution in the Saemangeum Watershed, South Korea

Li, Ting; Kim, Gwangseob

doi:10.3390/w11101982

Cited by 15 publications

(11 citation statements)

References 17 publications

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“…Overall, the dominant feature detected was the widespread precipitation, maximum, and minimum temperature increase in the 21st century in the Jeonju station area. This result agreed with the previous study by Li and Kim et al [47], which reported the gradual increases of 70.9 to 233.8 mm and 1.7 to 5.7 • C in annual precipitation and temperature, respectively, for two periods (2019-2059) and (2060-2099) under RCP 4.5 and RCP 8.5 climate change scenarios…”

Section: Future Change In Precipitation Maximum and Minimum Temperaturesupporting

confidence: 93%

Evaluating the Impact of Climate Change on Paddy Water Balance Using APEX-Paddy Model

Kamruzzaman

Hwang

Choi

et al. 2020

Water

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This research aims to assess the impact of climate change on water balance components in irrigated paddy cultivation. The APEX-Paddy model, which is the modified version of the APEX (Agricultural Policy/Environmental eXtender) model for paddy ecosystems, was used to evaluate the paddy water balance components considering future climate scenarios. The bias-corrected future projections of climate data from 29 GCMs (General Circulation Models) were applied to the APEX-Paddy model simulation. The study area (Jeonju station) forecasts generally show increasing patterns in rainfall, maximum temperature, and minimum temperature with a rate of up to 23%, 27%, and 45%, respectively. The hydrological simulations suggest over-proportional runoff–rainfall and under-proportional percolation and deep-percolation–rainfall relationships for the modeled climate scenarios. Climate change scenarios showed that the evapotranspiration amount was estimated to decrease compared to the baseline period (1976–2005). The evaporation was likely to increase by 0.12%, 2.21%, and 7.81% during the 2010s, 2040s, and 2070s, respectively under Representative Concentration Pathway (RCP)8.5, due to the increase in temperature. The change in evaporation was more pronounced in RCP8.5 than the RCP4.5 scenario. The transpiration is expected to reduce by 2.30% and 12.62% by the end of the century (the 2070s) under RCP4.5 and RCP8.5, respectively, due to increased CO2 concentration. The irrigation water demand is generally expected to increase over time in the future under both climate scenarios. Compared to the baseline, the most significant change is expected to increase in the 2040s by 3.21% under RCP8.5, while the lowest increase was found by 0.36% in 2010s under RCP4.5. The increment of irrigation does not show a significant difference; the rate of increase in the irrigation was found to be greater RCP8.5 than RCP4.5 except in the 2070s. The findings of this study can play a significant role as the basis for evaluating the vulnerability of rice production concerning water management against climate change.

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Section: Future Change In Precipitation Maximum and Minimum Temperaturesupporting

confidence: 93%

Evaluating the Impact of Climate Change on Paddy Water Balance Using APEX-Paddy Model

Kamruzzaman

Hwang

Choi

et al. 2020

Water

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“…So, the water volume is increased as water surface elevation increasing. These results are similar to those found in the previous researches (Jeong et al, 2018a;Li & Kim, 2019;Oda et al, 2019). Second, the water quality results from SCHISM-CoSiNE model including dissolved oxygen (DO), concentration of nitrate (NO 3 ) and concentration of phosphate (PO 4 ) are analyzed as the designated water surface elevations are varied at each regions of interest (see Figure 9).…”

Section: Resultssupporting

confidence: 93%

Hydraulic and Ecological Changes Under Drainage Gate Operations With Coupled Model Schism-Cosine in Saemangeum Basin, Korea

Yoo

Jeong

Kim

et al. 2021

Journal of Environmental Engineering and Landscape Management

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The drainage gates have been controlled for desalination under normal conditions and flood defense in Saemangeum basin, Korea. Recently, it became an issue that the gates have been opened not to deteriorate water quality in the lake. It is, thus, necessary to precisely estimate the changes of water quality characteristics, especially DO, phosphate and nitrate, in the lake according to various gate operations. In this study, Semi-implicit Cross-scale Hydroscience Integrated System Model and Carbon, Silicate, Nitrogen Ecosystem model (SCHISM-CoSiNE) which is cable to simulate dynamic exchange such as gate operation conditions was utilized to obtain reliable and reasonable results including hydrodyanamic and environmental variables. For the verification, the measured data at 6 locations in Saemangeum basin was used to compare incluidng temperatue and salintiy from 2016 and each relative error became small enough to show high accurary. Also, under various scenarios by changing the designated water surface elevation on flood seasons, this model has been applied to present the best designated water surface elevation in terms of both water quality and water supply in the Saemangeum basin. It becomes possbile to show reliable guidance for dynamic operations and environmental changes with this model as requested in near future.

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“…Before construction, the tidal range in the study area was up to 6 m; after construction, it is less than 1 m, even when the sluice gates are fully open [24,25]. The mean monthly air temperatures range from −0.4 • C (January) to 25.7 • C (August), and the mean annual precipitation is 1204 mm; precipitation mainly occurs during summer (June to September), which accounts for more than 65% of the total annual precipitation [26].…”

Section: Site Descriptionmentioning

confidence: 93%

Assessment of Water Quality in a Coastal Region of Sea Dike Construction in Korea and the Impact of Low Dissolved Oxygen Concentrations on pH Changes

Lee

et al. 2023

JMSE

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To investigate the factors affecting water quality in coastal regions with sea dike constructions, surface water outside a sea dike was monitored for six years from 2015 to 2020 in the Saemangeum region of Korea. Statistical analyses of the six years of high-frequency measurements revealed that the water quality in this system was predominantly governed by natural processes followed by pollutant inputs as the secondary influencing factor. Severe dissolved oxygen (DO) depletion was observed in the surface waters during warm periods, probably owing to the advection of DO-depleted water from elsewhere to the surface layer. Based on the apparent oxygen utilization (AOU)–pH relationship (r = 0.52, n = 1837), the maximum AOU (180 µM) led to a pH decrease from 8.04 to 7.50, which was considerably lower than the estimated value of 7.72. This extra pH drop was probably due to a reduction in the buffering capacity associated with increased CO2 in the water column originating from the atmosphere and in situ production, as well as local water column redox reactions associated with benthic inputs of reduced chemical species. Overall, persistent DO depletion with ongoing eutrophication/hypoxia could accelerate ocean acidification in Korean coastal waters, which could be more acute in coastal regions with artificial coastal constructions.

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Impacts of Climate Change Scenarios on Non-Point Source Pollution in the Saemangeum Watershed, South Korea

Cited by 15 publications

References 17 publications

Evaluating the Impact of Climate Change on Paddy Water Balance Using APEX-Paddy Model

Evaluating the Impact of Climate Change on Paddy Water Balance Using APEX-Paddy Model

Hydraulic and Ecological Changes Under Drainage Gate Operations With Coupled Model Schism-Cosine in Saemangeum Basin, Korea

Assessment of Water Quality in a Coastal Region of Sea Dike Construction in Korea and the Impact of Low Dissolved Oxygen Concentrations on pH Changes

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