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Physics of estuaries and coastal seas
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Impact of Human Activities on the Hydrodynamics Regime in the Pearl River Delta During the Flood Season
P-P1-09-S
Liu Changjie* , State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University
Yu Minghui, State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University
Cai Huayang, Institute of Estuarine and Coastal Research, School of Marine Sciences, Sun Yat-sen University, Guangzhou
Presenter Email: liuchangjie@whu.edu.cn |
| It is well-known that both human activities and river-tide dynamics are significant factors affecting the hydrodynamic process in the estuarine and coastal regions. In particular, the riverbed down-cutting caused by human interventions (e.g., dam construction, sand excavation and dredging for navigation etc.) may exert dramatic changes in hydrodynamic characteristics of the Pearl River Delta (PRD). In this study, we examine the changes in rating curves of residual water level (RWL) versus residual water discharge (RWD) at the upstream stations of the PRD and the variations of RWL along the West, North and East Rivers in three different flood seasons (here termed as “986”, “056”, “086” respectively). The results show that the rating curves shift down dramatically (0.65-4.9 m) in “056” and “086”, compared with the case in “986”. Meanwhile, the RWL along the three tributaries falls significantly at the same RWD and the maximum reduction of RWL occurs in the East River. In addition, the RWL decreases more seriously at the upper reaches than that at the lower reaches, which reduces the RWL slope and enhances the tidal dynamic of the PRD. The main reason may be contributed to the uneven deepening of the river channels induced by uncontrolled and disorderly human activities. However, when compared with the case in “056”, the rating curves in “086” shift up slightly (0.11-0.29 m) and the RWL increases at the upstream parts but decreases at the downstream parts. The underlying causes can be attributed to the impacts of river-tide dynamics, which is converse to the effect of the riverbed down-cutting. These obtained results will, hopefully, provide scientific guidelines for the general water managements, especially for the flood control in the PRD. |
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