Tidal modification and its effect on sluice-gate outflow after completion of the Saemangeum dike, South Korea

Lee, Seok; Lie, Heung‐Jae; Song, Kyu‐Min; Cho, Cheol-Ho; Lim, Eun-Pyo

doi:10.1007/s10872-008-0064-7

Cited by 29 publications

(9 citation statements)

References 8 publications

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“…It is possible that the tides in the Yellow Sea have changed between 1976 and 2011, because the area has also experienced large coastline modifications over this period of time. For example, Lee et al [2008] estimated amplitude changes caused by the construction of a 33 km long dyke along the west coast of Korea and found that M 2 amplitudes may have increased for more than 0.03 m in the south western Yellow Sea when the dyke was completed in 2006. In addition, amplitude changes in the ocean tides may also have modulated the tidal regime in the Bohai Sea by changing the boundary conditions [see Woodworth, 2010].…”

Section: Summary and Discussionmentioning

confidence: 99%

The impact of rapid coastline changes and sea level rise on the tides in the Bohai Sea, China

Pelling

Uehara

Green

2013

J. Geophys. Res. Oceans

116

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[1] The tidal regime in the Bohai Sea, China, is investigated using observations and an established numerical tidal model. The area has recently experienced rapid coastline changes due to natural developments of the Yellow River delta and large-scale anthropogenic land reclamation. These morphological changes are not reflected in most global bathymetric databases and are thus rarely incorporated into investigations of the Bohai Sea. It is shown that there have indeed been significant changes in the tidal regime in the Bohai Sea over the last 35 years, with M 2 amplitudes changing up to 20 cm in some parts. The model captures some of these changes when the appropriate bathymetries are used. Furthermore, the simulations show that the tides in the Bohai Sea have become more sensitive to future sea level rise and the way in which it is implemented in the model (i.e., whether or not flood defenses are included). These sensitivity changes are due to the recent coastal developments.Citation: Pelling, H. E., K. Uehara, and J. A. M. Green (2013), The impact of rapid coastline changes and sea level rise on the tides in

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Section: Summary and Discussionmentioning

confidence: 99%

The impact of rapid coastline changes and sea level rise on the tides in the Bohai Sea, China

Pelling

Uehara

Green

2013

J. Geophys. Res. Oceans

116

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“…Pelling, Uehara, et al (2013) found that tidal evolution in Bohai Bay due to local bathymetry changes is restricted within the study domain. In contrast, Lee et al (2008) suggested that even local coastal construction on the west coast of Korea would impact the tidal amplitude on the coast of China. Similarly, Gao et al (2014) found that the construction at Jiangzhou Bay, which is north of China, can also affect tidal waves in South Korea.…”

Section: Journal Of Geophysical Research: Oceansmentioning

confidence: 99%

Tidal Responses to Future Sea Level Trends on the Yellow Sea Shelf

Feng

et al. 2019

JGR Oceans

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Quantifying how tides evolve with coupling between future sea level rise (SLR) and different coastline configurations is imperative for proposing appropriate coastal defense strategies. By using numerical models, we investigated tidal changes and determined a realistic trend of SLR on the Jiangsu coastal area and adjacent sea on the Yellow Sea shelf. A notable decrease in tidal range occurs in the northern shelf, and the tide increases mainly in the southern shelf. Tidal changes are of both signs, while the increase in sea level is unidirectional. Thus, the SLR effect on tide is not additive in all locations. We also explored the nonlinearity and spatial similarity in tidal range in response to the SLR considering uniform SLR scenarios with multiple levels and allowing inundation of the natural coastline. The patterns of change in tide evolution on the study domain remain linear until the SLR exceeds 2.0 m. Simulations and comparisons are further conducted between the responses of hardened and natural shoreline configurations to SLR. Hardened shoreline introduces both local and remote spatial variability in tidal responses. On the regional scale, SLR induces a shift in the tidal system in the offshore region, which controls the net energy flux into the embayment upon the coast. On the local scale, tidal dynamics are mainly a competition between net energy flux and tidal dissipation and are plausibly influenced by tidal reflection, which depends on whether a basin is tidally reflective.

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“…On the other hand, the the averaged TSI values indicated that the Saemangeum Reservoir is almost eutrophicated at both temporal and spatial scale (Fig 3; [30]), implying that the gate operation might have minor role in regulating the trophic condition. Following the completion of Saemangeum dyke construction, the tidal regime (range and currents) at the Saemangeum Reservoir were markedly limited (more than 80%) even though the sluice gates were fully opened [20]. In addition, the seawater exchange ratio (flushing rate, %) within the impoundment after completion of the dyke was decreased to half of the dyke construction stage at 4.5 km opening [21].…”

Section: Discussionmentioning

confidence: 99%

“…Because tidal currents are largely limited as a result of the dyke [20, 21], changes in the planktonic community in the Saemangeum Reservoir are expected to reflect strongly the environmental conditions. Although the copepod community structure in the Saemangeum Reservoir had been described at both the pre- and post-construction phases of the dyke [22,23], any community variation associated with salinity change and trophic state was not clearly detected.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal variability in a copepod community associated with fluctuations in salinity and trophic state in an artificial brackish reservoir at Saemangeum, South Korea

et al. 2018

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Saemangeum Reservoir in South Korea is an estuarine system enclosed by a dyke construction, where seawater inflow and retained water outflow are managed by the opening/closing of sluice gates installed in the southern part of the dyke. An exchange of the reservoir water can cause spatiotemporal fluctuations in the salinity and trophic state, which are major drivers determining variation in the composition of biological communities in estuarine systems. Here, we investigated the seasonal and spatial variability in the copepod community and environmental conditions (water temperature, salinity, transparency, chlorophyll a concentration, total nitrogen, total phosphorus and Carlson’s trophic state index) based on seasonally conducted field monitoring in the Saemangeum Reservoir from July 2013 to January 2018. In addition to the role of temperature, salinity and chlorophyll a concentration in structuring the copepod community and diversity, the biological indices of copepods with respect to salinity range and trophic state, were evaluated. The spatiotemporal variability in the salinity and trophic state variables showed contrasting patterns, and chlorophyll a concentration was negatively affected by salinity, indicating that the reservoir water was being highly exchanged with opening of the sluice gates. The mean trophic state index values, however, were constant in the eutrophic state (50―70). Dominant copepods were Acartia (A. hudsonica, A. sinjiensis, Acartia spp.) and Oithona (O. davisae and Oithona spp.), which are common species in eutrophic neritic water. Variation in the copepod community was mainly associated with the seasonal succession of the dominant species rather than a spatial gradient (from around the estuary to the sluice gates); however, site-specific differences in frequencies of several non-dominant species could be detected around the estuary (Sinocalanus tenellus) and the sluice gates (Centropages spp., Tigriopus spp. and Labidocera rotunda). The copepod diversity increased with species-richness from around the estuary to the sluice gates, which could result from variation in the site-specific location of non-dominant species. The frequency of particular species was also able to discriminate in terms of the salinity range (oligohaline: A. pacifica, S. tenellus and A. sinjiensis; mesohaline: Pseudodiaptomus inopinus; and polyhaline: C. abdominalis and Centropages spp.) and the trophic state (mesotrophic: C. abdominalis, Calanus sinicus and Centropages spp.; and hypereutrophic: S. tenellus, P. inopinus and Sinocalanus spp.). The findings from this study not only identify the factors determining spatiotemporal variation in the copepod community in the Saemangeum Reservoir, but also expand the applicability of copepods as biological indicators of conditions associated with salinity range and trophic state in other enclosed estuarine systems.

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Tidal modification and its effect on sluice-gate outflow after completion of the Saemangeum dike, South Korea

Cited by 29 publications

References 8 publications

The impact of rapid coastline changes and sea level rise on the tides in the Bohai Sea, China

The impact of rapid coastline changes and sea level rise on the tides in the Bohai Sea, China

Tidal Responses to Future Sea Level Trends on the Yellow Sea Shelf

Spatiotemporal variability in a copepod community associated with fluctuations in salinity and trophic state in an artificial brackish reservoir at Saemangeum, South Korea

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