A comparison of the performance of submerged and detached artificial headlands in a beach nourishment project

Pan, Yi; Kuang, Chunxiang; Chen, Y.P.; Yin, Shuo; Yang, Yin; Yang, Yanxiong; Zhang, J.B.; Qiu, Ruofeng; Zhang, Y.

doi:10.1016/j.oceaneng.2018.04.038

Cited by 7 publications

(3 citation statements)

References 32 publications

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“…In recent years, its coastal waters have been more significantly affected by river pollutants flowing into the sea and have been seriously threatened by ecological disasters such as red tide, green tide, and jellyfish blooms. In particular, more attention should be paid to the Golden Dream Bay area, because this is located in the middle of the coastline of Qinhuangdao and its capacity for water exchange and pollutant transport is weakened by structures such as artificial islands, docks, and bridges (Kuang et al, 2015;Pan et al, 2018;Kuang et al, 2019;Pan et al, 2020;Kuang et al, 2021;Pan et al, 2022). Divided by the prismatic island in the estuary, a large amount of flood discharge sediment enters the Golden Dream Bay (Sheng et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

A numerical study on the responses of coastal water quality to river runoff after heavy rainfall in the case of a complex coastline with two artificial islands

Wang

Feng²,

Zhang³

et al. 2023

Front. Mar. Sci.

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Heavy rainfall causes large volumes of freshwater and nutrient salts to flow from rivers into the sea. This leads to major changes in the ecological environment of estuarine waters in a short period of time. The responses of the estuarine hydro-environment become more complex with the concentrated construction of artificial structures, which is a major cause of marine ecological disasters. This paper considers the Tang Estuary in Qinhuangdao, where artificial structures (e.g., ports, artificial islands, and bridges) are concentrated, as a prototype with the weak tidal dynamic environment. A nested prototype of hydrodynamics and water quality was established using a Delft3D model, with coupled waves and flows. The model was used to simulate the spatial and ephemeral characteristics of the short-term responses of ecological environmental factors, such as dissolved inorganic nitrogen (DIN), nitrate-nitrogen (i.e., NO3-N), ammonium-nitrogen (NH4-N), and orthophosphate (i.e., PO4-P), to an episode of heavy rainfall in August 2022. The results showed that concentrations of DIN and NO3-N in the source areas remain high after the flooding process. The concentration recovered to normal values approximately 5.5 days after the flooding process. In contrast, NH4-N and PO4-P showed a response with ephemeral correspondence with the flooding process, and concentration recovery took only approximately 1 day. This paper proposes two short-term response modes of pollutant diffusion, which provide help in exploring the role of hydro-environmental changes in offshore algal hazards and the effect of permeable buildings on pollutant dispersion. This additionally provides possibilities with the forecasting of red tide and green tide, and for their prevention in the future.

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Section: Introductionmentioning

confidence: 99%

A numerical study on the responses of coastal water quality to river runoff after heavy rainfall in the case of a complex coastline with two artificial islands

Wang

Feng²,

Zhang³

et al. 2023

Front. Mar. Sci.

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“…However, the sea dike risk due to climate change is determined by both the changes in extreme storm surge levels and the original sea dike crest levels, which are determined by historical data and different alone the coast of the estuaries. Therefore, it is necessary to investigate the changes in return periods of water levels due to climate change, to provide reference for future planning of coastal and offshore projects such as sea levees (Pan et al, 2015a;Pan et al, 2015b), harbours (Gao et al, 2020;Wang et al, 2020;Gao et al, 2021), offshore wind power fields (Guan et al, 2019;He et al, 2019), artificial beaches (Pan et al, 2017;Pan et al, 2018;Li et al, 2021;Li et al, 2022), etc. In this paper, the effects of increasing maximum wind speed of tropical cyclones on the return periods of water levels in the sea area of the Yangtze River Delta are investigated via a serious of numerical experiments. Although global climate change comes with a serious of effects, e.g., sea level rise, increasing maximum wind speed of tropical cyclones, and changes in the tracks of tropical cyclones, this study only focus on the effects of increasing maximum wind speed of tropical cyclones.…”

Section: Introductionmentioning

confidence: 99%

An investigation on the effects of increasing maximum wind speed of tropical cyclones on the return periods of water levels in the sea area of the Yangtze River Delta

Pan

Tan

et al. 2023

Front. Mar. Sci.

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This paper investigates the impact of increasing maximum wind speed of tropical cyclones on the return periods of water levels in the sea area of the Yangtze River Delta. To conduct this study, a series of numerical experiments are performed using historical tropical cyclones that impacted the Yangtze River Delta from 1949 to 2019. The aim is to analyze the effects of global climate change on extreme water levels and the corresponding return periods. To obtain the historical water levels in the sea areas of the Yangtze River Delta, a storm surge model is driven by the selected tropical cyclones. The simulated astronomical tidal levels during the same period are also used. The extreme water levels of different return periods are then calculated. The maximum wind speeds of the selected tropical cyclones are increased by 11% according to the expected amount of increase under global climate change. The extreme water levels of different return periods under this scenario are calculated with the same procedure. The results of the study show that the impact of increasing maximum wind speed of tropical cyclones on the increases of extreme water levels and the decrease of return periods is more significant in the inner area of the estuaries than in the outer areas. Moreover, the responses of the extreme water levels and the corresponding return periods in the Yangtze River Estuary and the Hangzhou Bay show different characteristics. The results of this study provide significant reference value for the management of future coastal disaster prevention and mitigation in the Yangtze River Delta. Furthermore, the methodology used in this study can be applied in other estuaries to investigate the potential impacts of changes in climate and hydrology factors on extreme water levels and the corresponding return periods.

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“…Since many coasts have already built engineering structures, further design should incorporate and utilize the effect of the existing coastal structures [28][29][30][31]. In addition, modified structures such as submerged artificial headlands (SAH) and detached artificial headlands (DAH) were applied to enhance the water exchange and thus improve the water environment [32]. Third, the key problems, pointed out by Ranasinghe and Turner [33] and associated with but not limited to the use of LCSs, are the identification of environmental and structural parameters governing the mode (i.e., erosion or accretion), the magnitude (e.g., size of salient), and the response of the adjacent shoreline.…”

Section: Introductionmentioning

confidence: 99%

Experimental Observation on Beach Evolution Process with Presence of Artificial Submerged Sand Bar and Reef

Kuang

Han

et al. 2020

JMSE

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For observation on the influence mechanism of environmentally and aesthetically friendly artificial submerged sand bars and reefs in a process-based way, a set of experiments was conducted in a 50 m-long flume to reproduce the cross-shore beach morphodynamic process under four irregular wave conditions. The beach behavior is characterized by the scarp (indicating erosion) and the breaker bar (indicating deposition), respectively, and the scarp location can be formulated as a linear equation regarding the natural exponential of the duration time. Overall, main conclusions are: (1) the cross-shore structure of significant wave height and set-up is mainly determined by the artificial reef (AR); (2) the cross-shore distribution of wave skewness, asymmetry, and undertow (indicating shoaling and breaking) is more affected by the artificial submerged sand bar (ASB); (3) the ASB deforms and loses its sand as it attenuates incident waves, which leads to a complex sediment transport pattern; (4) the scarp retreat is related to the beach state, which can be changed by the AR and the ASB; (5) the AR, the ASB, and their combination decrease wave attack on the beach. In conclusion, this study proves positive effects of the AR and the ASB in beach protection through their process-based influences on beach behaviors and beach states for erosive waves.

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A comparison of the performance of submerged and detached artificial headlands in a beach nourishment project

Cited by 7 publications

References 32 publications

A numerical study on the responses of coastal water quality to river runoff after heavy rainfall in the case of a complex coastline with two artificial islands

A numerical study on the responses of coastal water quality to river runoff after heavy rainfall in the case of a complex coastline with two artificial islands

An investigation on the effects of increasing maximum wind speed of tropical cyclones on the return periods of water levels in the sea area of the Yangtze River Delta

Experimental Observation on Beach Evolution Process with Presence of Artificial Submerged Sand Bar and Reef

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