Impact of trends in river discharge and ocean tides on water level dynamics in the Pearl River Delta

Cao, Yu; Zhang, Wei; Zhu, Yinian; Ji, Xiaomei; Xu, Yong; Wu, Yao; Hoitink, A.J.F.

doi:10.1016/j.coastaleng.2020.103634

Cited by 29 publications

(17 citation statements)

References 50 publications

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“…Cao et al. (2020) proved that different from Sanshanjiao station, the contribution of river discharge to water level variation at Zhuyin station is greater than the contribution of the tidal motion. This is probably because of the comparatively high discharge in the West River, which is more than three times that of the North River.…”

Section: Resultsmentioning

confidence: 99%

Peak Water Level Response to Channel Deepening Depends on Interaction Between Tides and the River Flow

et al. 2022

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The Pearl River Delta represents a tide‐influenced lowland delta where sand mining has deepened the distributary channels. This study sets out to investigate the impacts of channel deepening on peak water levels across the delta. Based on collected hydrological data before and after sediment mining and hydrodynamic modeling, three regions are identified where sand mining‐induced changes in peak water levels have a different underlying cause. In the river‐dominated regions, peak water levels have significantly decreased because of the sand excavation, and thus the associated flood risk was reduced. In a transition region, the sand mining practice has increased peak water levels. In the tide‐dominated coastal region, the changes in peak water levels follow the rise in sea level and respond to human activities such as land reclamation. To understand the underlying mechanisms, the changes of subtidal friction governing tidal dynamics before and during sand mining are explored, and a simple linear regression model is used to predict subtidal water levels governing peak flood levels. Results from the hydrodynamic model and the linear regression models quantify exactly how the direct effect of channel bed lowering, river‐tide interaction, tidal amplification, and sea level rise have contributed to peak water level change, which offers a new analysis framework that can be applied in other systems.

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Section: Resultsmentioning

confidence: 99%

Peak Water Level Response to Channel Deepening Depends on Interaction Between Tides and the River Flow

et al. 2022

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“…Therefore, the MK test has the advantage that their significance is not affected by the distribution of the data. This test is an excellent tool and has been extensively used in hydrological time series for trend detection [19,57,58].…”

Section: Mann-kendall Testmentioning

confidence: 99%

Statistical and Hydrological Evaluations of Water Dynamics in the Lower Sai Gon-Dong Nai River, Vietnam

Giang

Quang

Long³

et al. 2022

Water

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The water levels downstream of the Sai Gon and Dong Nai river in Southern Vietnam have been significantly changed over the last three decades, leading to severe impacts on urban flooding and salinity intrusion and threating the socio-economic development of the region and lives of many local people. In this study, the Mann-Kendall (MK) and trend-free prewhitening (TFPW) tests were applied to detect the water level trends and changepoints based on a water level time series at six gauging stations that were located along the main rivers to the sea over 1980–2019. The results indicated that the water level has rapidly increased by about 0.17 to 1.8 cm/year at most gauge stations surrounding Ho Chi Minh City, strongly relating to urbanization and the dike polder system’s impacts that eliminates the water storage space. In addition, the operation of upstream reservoirs has contributed to water level changes with significant consequences since the high-water level at Tri An station on the Dong Nai river occurs 1000–1500 times compared to 300–500 times before the operation. Although the effects of the flows from the sea are less than the two other factors, the local government should seriously consider water level changes, especially in the coastal regions. Our study contributes empirical evidence to evaluate the water level trends in the planning and development of infrastructure, which is necessary to adapt to future changes in Southern Vietnam’s hydrologic system.

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“…Sensitivity coefficients can simplify patterns with various ranges and dimensions into one nondimensional index (e.g., Beven, 1979;Coleman, 1976), which is often applied in hydrologic and oceanic science studies (e.g., Cao, 2020;Gong et al, 2006). The sensitivity coefficient (S ai ) of the tidal skewness (γ 2 ) caused by the FENG AND FENG 10.1029/2020JC016583 interactions between a harmonic constituent and its first overtide to the variability in the amplitude of one tidal constituent within the interaction can be quantified mathematically as follows:…”

Section: Appendix A: Sensitivity Coefficient Of Tidal Skewness Dependent On the Variation In Tidal Amplitude Of A Harmonic Constituentmentioning

confidence: 99%

On the Role of Anthropogenic Activity and Sea‐Level‐Rise in Tidal Distortion on the Open Coast of the Yellow Sea Shelf

Feng

2021

JGR Oceans

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This study investigates how varied coastline strategies and rising mean‐sea‐level influence tidal distortion along the open coast of the Yellow Sea shelf. The major contributors to tidal distortion were first identified. Then, the primary tidal constituents causing changes in tidal propagation and distortion in response to shoreline reconstruction management and near‐future sea‐level‐rise (SLR) were determined. The intrinsic mechanisms causing tidal duration asymmetry (TDA) were investigated and found to differ in various types of coastal systems. Specifically, the nonlinear tidal interaction between M2/M4, M2/S2/MS4 and K1/O1/M2 are the top three dominant contributors to TDA. The interactions between M2/M4 and M2/S2/MS4 are most sensitive to different coastline configurations and produce the largest evolution in tidal distortion. Two primary factors are (i) the location of the amphidromic point of the semidiurnal tides in the deep ocean, which controls the M2 and S2 energy fluxes into embayment, and (ii) the nondimensional amplitude (A/h), which importantly indicates tidal nonlinearity and determines shallow tide generation. For the coast with a progressive tidal system, tidal distortion and shallow‐water tide genesis depend mainly on the influx of semidiurnal tides from offshore, which is controlled by the position of the M2 amphidrome. For a coast with quasistanding tidal behavior, however, the scales and positions of tidal flats and shoals play vital roles in tidal distortion and the genesis of shallow‐water tides. Model simulations suggest that hardened shoreline or SLR could dampen the advection and bottom dissipation, thus reducing tidal distortion.

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Impact of trends in river discharge and ocean tides on water level dynamics in the Pearl River Delta

Cited by 29 publications

References 50 publications

Peak Water Level Response to Channel Deepening Depends on Interaction Between Tides and the River Flow

Peak Water Level Response to Channel Deepening Depends on Interaction Between Tides and the River Flow

Statistical and Hydrological Evaluations of Water Dynamics in the Lower Sai Gon-Dong Nai River, Vietnam

On the Role of Anthropogenic Activity and Sea‐Level‐Rise in Tidal Distortion on the Open Coast of the Yellow Sea Shelf

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