Changes in the Hydrodynamics of Hangzhou Bay Due to Land Reclamation in the Past 60 Years

Li, Li; Ye, Taoyan; Wang, Xiaohua; He, Zhiguo; Shao, Mingming

doi:10.1016/b978-0-12-811977-8.00005-4

Cited by 5 publications

(4 citation statements)

References 18 publications

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“…In comparison to previous studies on the effects of coastline and bathymetry changes on storm surges, our research encompasses the entire Zhejiang coasts, resulting in a comprehensive analysis. Our findings reveal diverse patterns of storm surge and tide changes in historical and contemporary conditions, aligning with prior regional-scale investigations in HZB [18] and Sanmen Bay [24]. Moreover, our study underscores the distinct roles played by the coastline and bathymetry through simulation experiments.…”

Section: Comparison With Previous Studiessupporting

confidence: 88%

“…Although the reclamation projects have been undertaken to address land shortage, the geometric and topographic changes of coasts have proved that these projects have significantly altered the nearshore hydrodynamic process. In some areas sheltered by groynes, currents, storm surges, and strong waves have been mitigated to varying extents [17,18]. Conversely, in estuaries and bays, reclamation and harbor construction have led to a decrease in prism, resulting in elevated tides and storm surges.…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Coastline and Bathymetry Changes on the Storm Tides in Zhejiang Coasts

Gou,

Liang,

Cai

et al. 2023

JMSE

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Coastal evolutions are expected to have a significant impact on storm tides, disproportionately aggravating coastal flooding. In this study, we utilize a nested storm tide model to provide an integrated investigation of storm tide responses to changes in coastline and bathymetry along the Zhejiang coasts. We selected coastline and bathymetry data from 1980 and 2016, as well as data from three typical typhoon events (i.e., Winnie, Haikui, and Chan-hom) for simulating the storm surge processes. The results indicate that changes in the coastline and bathymetry from 1980 to 2016 have resulted in an increase in storm tides in the northern part and a decrease in the central part of Zhejiang. Specifically, storm tides in Hangzhou Bay have increased significantly, with an average increase of about 0.3 m in the maximum storm tides primarily attributed to coastline changes. On the contrary, in smaller basins like Sanmen Bay, while reclamation itself has reduced peak storm surges, rapid siltation has consequently exacerbated the storm surge. By decomposing storm tides into astronomical tides and storm surges, we discovered that the change in tidal levels was twice as significant as the surge change. Moreover, the nonlinear tide–surge interaction was nearly four times that of the pure surge, significantly contributing to storm surge variation. Alterations in the momentum balance reveal that the water depth-induced bottom friction and wind stress increase contributes to the local enlargement of storm tides at the bay head, while the coastline changes exaggerate nearshore storm tides through an increase in the advection term.

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Section: Comparison With Previous Studiessupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

The Impact of Coastline and Bathymetry Changes on the Storm Tides in Zhejiang Coasts

Gou,

Liang,

Cai

et al. 2023

JMSE

View full text Add to dashboard Cite

show abstract

“…These large-scale reclamation declined the tidal prism but aggravated the tidal amplification. Li et al [42], using the numerical model, reviewed the tidal dynamics of HZB from 1974 to 2016 and confirmed a strong interplay between the rapid shrunk bay and tides with a maximum tidal range increased by >2 m. Since the year 2017, reclamation projects have been severely restricted; consequently, tidal amplification by artificial structures will gradually decline. In this view, our model results based on the current coastline are expected to provide more implications for the future tidal dynamics in HZB.…”

Section: Comparison With Previous Studiesmentioning

confidence: 99%

Effects of Sea Level Rise on Tidal Dynamics in Macrotidal Hangzhou Bay

Liang

Chen

Liu

et al. 2022

JMSE

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Sea level rise (SLR) due to climate change is expected to alter tidal processes and energy transport, disproportionately affecting coastal communities. Utilizing a nested hydrodynamics model, we provided an integrated investigation of tidal responses to SLR in the Hangzhou Bay (HZB). The scenarios of SLR in the next hundred years count for both non-uniform trends based on historical altimetry data and uniform trends from the latest IPCC projections. In a comparison of model results under different SLR scenarios, we found that the tidal range is amplified by SLR in HZB with stronger amplification at the shallow southern coast. Tidal range change generally increases with the SLR scale; however, neglecting the heterogeneities in the spatial distribution of SLR tends to overestimate the SLR effects. The harmonic analysis illustrates that SLR exaggerates the dominated semidiurnal tides (M2 and S2) but dampens their overtides and compound tides (M4, M6, and MS4), of which M2 amplitude amplification explains 71.2–90.0% of tidal range change. SLR tends to promote tidal energy entering HZB through the Zhoushan Archipelago (ZA) compared to the prototype, while dampened sea-bed roughness and reduced tidal velocity come with a less dissipative environment in HZB, resulting in 6–18% more tidal energy exported upstream. Numerical experiments indicate ZA has significant effects on tidal responses and energy flux generation, therefore, its quantitative influences and physical mechanism are also discussed in this paper.

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“…With an average tidal range of 4.77 m, the hydrodynamics of Andong Shoal are primarily influenced by tidal currents, which diminish towards the landward direction (Liu et al, 2022;Wang et al, 2022). Andong Shoal receives a significant amount of sediments from the Yangtze River and its upper stream, fostering a rapid sedimentary environment conducive to the development of mudflats and saltmarshes (Li et al, 2019;Liu et al, 2022).…”

Section: Study Areamentioning

confidence: 99%

Measuring canopy morphology of saltmarsh plant patches using UAV-based LiDAR data

Hong,

Ge,

Wang

et al. 2024

Front. Mar. Sci.

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Plant patches play a crucial role in understanding the biogeomorphology of saltmarshes. Although two-dimensional optical remote sensing has long been applied to the study of saltmarsh plant patches, studies focusing on the canopy features at a patch-scale remain limited. Therefore, a simple and efficient method is needed to capture three-dimensional patch features and their relationship to habitat. This study utilized UAV-based LiDAR to obtain three-dimensional patch features of the native species S. mariqueter and the invasive species S. alterniflora in Andong Shoal, Hangzhou Bay, and examine the relationship between patch distribution and geomorphological characteristics. A workflow was established to overcome the inability of low-cost LiDAR sensor to penetrate dense vegetation, resulting in no ground return. Results showed that S. alterniflora patches were smaller in size but taller in canopy height than S. mariqueter patches. Regarding morphological patterns of patch canopy, S. alterniflora exhibited single-arch patterns (29%) and double-arch patterns (16%), whereas S. mariqueter exhibited only single-arch patterns (83%). The presence of double-arch patches suggested the development of fairy circles, indicating that the invasive S. alterniflora exhibits greater ecological resilience compared to the native S. mariqueter. Furthermore, this study explored the ecological niches of the two species in the pioneer zone of Andong Shoal. The ecological niches for S. alterniflora were 2.00-2.25 m, whereas that for S. mariqueter were 1.85-2.00 m and 2.25-2.40 m. Distance from the tidal creeks significantly moderated the number and area of patches for both species. This study demonstrated that UAV-based LiDAR technology can provide high-quality three-dimensional information about the pioneer zone of saltmarsh, thus helping to understand biogeomorphological processes in this region.

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Changes in the Hydrodynamics of Hangzhou Bay Due to Land Reclamation in the Past 60 Years

Cited by 5 publications

References 18 publications

The Impact of Coastline and Bathymetry Changes on the Storm Tides in Zhejiang Coasts

The Impact of Coastline and Bathymetry Changes on the Storm Tides in Zhejiang Coasts

Effects of Sea Level Rise on Tidal Dynamics in Macrotidal Hangzhou Bay

Measuring canopy morphology of saltmarsh plant patches using UAV-based LiDAR data

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