A tidally dependent plume bulge at the Pearl River Estuary mouth

Liu, Xingchuan; Gu, Yu; Li, Peiliang; Liu, Zizhou; Zhai, Fangguo; Wu, Kejian

doi:10.1016/j.ecss.2020.106867

Cited by 4 publications

(2 citation statements)

References 36 publications

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“…The overall model accuracy of simulating the tide was comparable with previous studies (e.g., Zu et al, 2014). Observed data during July 2020 showed there was a lowsalinity tongue outside the Pearl River Estuary (Figure 3A) and some researchers signify that the phenomenon is correlated to the West Channel geometry, estuarine outflow, tide, and wind (Pan et al, 2014;Liu et al, 2020). The surface plume extended in both directions to the east and west simultaneously (Figure 3A).…”

Section: Model Validationsupporting

confidence: 84%

River Plume Rooted on the Sea-Floor: Seasonal and Spring-Neap Variability of the Pearl River Plume Front

Zhi

et al. 2022

Front. Mar. Sci.

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The buoyant river plume front exhibits substantial variability in the sea surface under energetic external forcing. Although highly dynamic, the river plume is often “rooted” at specific locations through the bottom river plume front. In this study, we addressed this mechanism using the Pearl River plume as an example based on a well-validated numerical model. With this model, we described the spatiotemporal characteristics of the Pearl River salinity front. It was found that, although the surface Pearl River plume features bimodal extension in summer and winter seasons, owing to the reversal of the seasonal monsoon wind, there is a relatively stable bottom front extending from the river mouth to the downstream region (i.e., in the direction of propagation of Kelvin Wave). The occurrence probability of the bottom front showed that the front location varies only slightly and fixes at ∼8-m isobath. The Empirical Orthogonal Function (EOF) analysis demonstrated that runoff, wind, and tide are major regulating factors. These three factors jointly control the strength and position of the bottom front. In particular, the bottom front moves offshore during the spring tide but onshore during the neap tide, respectively, indicating a different mechanism from the classic frontal trapping theory. The sensitivity experiment without tide indicated that the bottom plume front shrinks significantly, and the river plume becomes more dynamic since it is no longer rooted on the seafloor.

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Section: Model Validationsupporting

confidence: 84%

River Plume Rooted on the Sea-Floor: Seasonal and Spring-Neap Variability of the Pearl River Plume Front

Zhi

et al. 2022

Front. Mar. Sci.

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“… 38 Several studies have reported the occurrence of hypoxia and plume bulges in this deposition zone, implying that the distribution pattern observed in our study was representative of the wet season in the northern SCS. 39 , 40 Plume bulges can be relatively stable for several days, which allows the accumulation of nutrients from freshwater runoff, favoring the growth of phytoplankton and thus accounting for higher chlorophyll a and lower DO as well as higher levels of pharmaceuticals. 38 Nearby aquaculture can also contribute to pharmaceutical contamination.…”

Section: Resultsmentioning

confidence: 99%

Source Apportionment, Hydrodynamic Influence, and Environmental Stress of Pharmaceuticals in a Microtidal Estuary with Multiple Outlets in South China

Ruan

Huang

et al. 2022

Environ. Sci. Technol.

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Pharmaceutical residues in the environment are of great concern as ubiquitous emerging contaminants. This study investigated the presence of 40 pharmaceuticals in water and sediment of the Pearl River Estuary (PRE) in the wet season of 2020. Among psychiatric drugs, only diazepam was found in water samples while six of them were detected in the sediment. The Σantibiotics levels ranged from 6.18 to 35.9 ng/L and 2.63 to 140 ng/g dry weight in water and sediment samples, respectively. Fluoroquinolones and tetracyclines were found well settling in the outlet sediment, while sulfonamides could be released from disturbed sediment under stronger tidal wash-out conditions. After entering the marine waters, pharmaceuticals tended to deposit at the PRE mouth by the influence of the plume bulge and onshore invasion of deep shelf waters. Low ecological risks to the aquatic organisms and of causing antimicrobial resistance were identified. Likewise, hydrological modeling results revealed insignificant risks: erythromycin-H 2 O and sulfamethoxazole discharged through the outlets constituted 30.8% and 6.74% of their environmental capacity, respectively. Source apportionment revealed that pharmaceutical discharges through the Humen and Yamen outlets were predominantly of animal origin. Overall, our findings provide strategic insights on environmental regulations to further minimize the environmental stress of pharmaceuticals in the PRE.

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Plume bulge observed in the Pearl River Estuary in summer: Spatiotemporal characteristics and influencing factors

Li¹,

Wang²,

Li³

et al. 2023

Estuarine, Coastal and Shelf Science

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A tidally dependent plume bulge at the Pearl River Estuary mouth

Cited by 4 publications

References 36 publications

River Plume Rooted on the Sea-Floor: Seasonal and Spring-Neap Variability of the Pearl River Plume Front

River Plume Rooted on the Sea-Floor: Seasonal and Spring-Neap Variability of the Pearl River Plume Front

Source Apportionment, Hydrodynamic Influence, and Environmental Stress of Pharmaceuticals in a Microtidal Estuary with Multiple Outlets in South China

Plume bulge observed in the Pearl River Estuary in summer: Spatiotemporal characteristics and influencing factors

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