Numerical investigation of successive land reclamation effects on hydrodynamics and water quality in Bohai Bay

Zhang, Hongxing; Shen, Yongming; Tang, Jun

doi:10.1016/j.oceaneng.2022.113483

Cited by 8 publications

(5 citation statements)

References 45 publications

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“…They can exert far-reaching downstream effects, impacting water quality several kilometers away [ 9 ]. These observations concur with the findings of Zhang et al [ 12 ] who showed that land reclamations in Bohai Bay (China) significantly altered the residual circulation and tidal prisms. Such alterations led to a decline in water quality, characterized by heightened retention of dissolved inorganic nitrogen in the bay and a rise in phytoplankton carbon concentrations.…”

Section: Discussionsupporting

confidence: 93%

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Land reclamation and its consequences: A 40-year analysis of water residence time in Doha Bay, Qatar

Lecart,

Dobbelaere,

Alaerts

et al. 2024

PLoS ONE

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Qatar’s rapid industrialization, notably in its capital city Doha, has spurred a surge in land reclamation projects, leading to a constriction of the entrance to Doha Bay. By reducing and deflecting the ocean circulation, land reclamation projects have reduced the effective dispersion of wastewater introduced into the bay and hence degraded the water quality. Here, we assess fluctuations in water residence time across three distinct eras (1980, 2000, and 2020) to gauge the impact of successive land reclamation developments. To do this, we couple the multi-scale ocean model SLIM with a Lagrangian model for water residence time within Doha’s coastal area. We consider three different topographies of Doha’s shoreline to identify which artificial structures contributed the most to increase water residence time. Our findings reveal that the residual ocean circulation in Doha Bay was predominantly impacted by northern developments post-2000. Between 1980 and 2000, the bay’s residence time saw a modest rise, of about one day on average. However, this was followed by a substantial surge, of three to six days on average, between 2000 and 2020, which is mostly attributable to The Pearl mega artificial island development. Certain regions of the bay witnessed a tripling of water residence time. Given the ongoing population expansion along the coast, it is anticipated that the growth of artificial structures and coastal reclamation will persist, thereby exacerbating the accumulation of pollutants in the bay. Our findings suggest that artificial offshore structures can exert far-reaching, non-local impacts on water quality, which need to be properly assessed during the planning stages of such developments.

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Section: Discussionsupporting

confidence: 93%

“…More broadly, several studies have underscored the detrimental impacts of land reclamation on water quality, particularly when carried out without comprehensive planning. Notable examples include reclamation projects in Qinzhou and Bohai Bay in China [ 11 , 12 ], and along the Shihwa coast in the Republic of Korea [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Land reclamation and its consequences: A 40-year analysis of water residence time in Doha Bay, Qatar

Lecart,

Dobbelaere,

Alaerts

et al. 2024

PLoS ONE

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“…Hu et al [10] simulated the change in hydrodynamics after the construction of the embankments in southwestern Laizhou Bay and found that the exchange capacity of the whole bay decreased by 10-20%. This kind of marine structure hinders the transport of sediment within the bay [11], which is also the main reason for pollutant accumulation in Laizhou Bay [12].…”

Section: Introductionmentioning

confidence: 99%

Improving Water Quality in a Sea Bay by Connecting Rivers on Both Sides of a Harbor

Chi,

Zhang,

Liu

et al. 2024

JMSE

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Improving water quality is imperative for many sea bays, including Laizhou Bay, China, to achieve sustainable marine development. In 2010, two 17.3 km long sand-retaining embankments were built in southwestern Laizhou Bay, which weakened the nearshore hydrodynamics and seriously impacted the water quality. To mitigate this issue, this study proposes connecting the two rivers on both sides of the embankments to improve the hydrodynamics and thus water exchange in the sea bay. The effectiveness was examined with a numerical model using Mike 21, which was validated for both tidal current velocity and direction at six monitoring locations in the sea bay. The results show that over 53% of the core research area displays an increase (0.0–0.4 m/s) in tidal current speed after the connection, primarily in and around the Haihengwei Fishing Port. Meanwhile, the Eulerian residual currents in the Haihengwei Fishing Port, Mi River estuary and Bailang River estuary become substantially larger (with a maximum increase of 0.16 m/s). In addition, the net transport distance of particles released near the connection increases by up to 39.89 km in one month. Overall, this case study demonstrates that connecting rivers next to a harbor can effectively improve hydrodynamics and thus improve water quality in the bay.

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“…These modifications led to inadequate seawater circulation and significantly reduced the ability for sewage to spread. Red tide catastrophes have been occurring frequently in the bays as a result of eutrophication brought on by declining water quality [11]. This has put a tremendous amount of pressure on aquatic environments and threatened the sustainable development of the economy and society in coastal regions [12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Eutrophication in Jiaozhou Bay via Water Color Parameters Determination with UAV-Borne Hyperspectral Imagery

et al. 2023

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The continued increase in greenhouse gas emissions as a result of unprecedented eutrophication has resulted in a rising trend of red tides in the sea, which may be responsible for ecological degradation in the surrounding environment. Studies rarely investigate the accurate concentration of seawater eutrophication substances in offshore aquaculture areas, which may lead to the exacerbated pollution of inshore aquaculture. We examined whether offshore seawater quality monitoring can be effectively performed through unmanned aerial vehicles’ (UAVs) airborne hyperspectral remote sensing technique at Jiaozhou Bay, a water body associated with eutrophication. We used the UAV airborne hyperspectral imager to detect and measure typical marine aquaculture areas in Jiaozhou Bay and selected the key parameters of seawater quality, chlorophyll-a (Chl-a) concentrations, and total suspended matter (TSM) concentrations as indicators of seawater eutrophication. The hyperspectral inversion model of the Jiaozhou Bay seawater (JZBZ) was established with the optimal sensitive band of parameters. Results showed that in comparison with the traditional inversion model, the inversion R2 of the Chl-a was 0.712, the RPD was 3.72, and the inversion R2 of the TSM concentration was 0.756 while the RPD was 5.83. We found that this model is more suitable for the retrieval of water color parameters in Jiaozhou Bay. Additionally, by actual measurement, it can be seen that the concentration ranges of Chl-a in the observation area are 0.380–1.74 mg/m3, and the concentration range of TSM is 12.6–131 mg/L. The results of this study indicate that the Jiaozhou Bay Water Quality Translation Model (JZBM), based on the UAV airborne hyperspectral imager, performs well in the inversion of the concentration of chlorophyll and suspended particulate matter in offshore water, which advances our understanding with a new method to assess the degree of eutrophication in coastal waters.

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Numerical investigation of successive land reclamation effects on hydrodynamics and water quality in Bohai Bay

Cited by 8 publications

References 45 publications

Land reclamation and its consequences: A 40-year analysis of water residence time in Doha Bay, Qatar

Land reclamation and its consequences: A 40-year analysis of water residence time in Doha Bay, Qatar

Improving Water Quality in a Sea Bay by Connecting Rivers on Both Sides of a Harbor

Evaluation of Eutrophication in Jiaozhou Bay via Water Color Parameters Determination with UAV-Borne Hyperspectral Imagery

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