Effect of Rainfall on Saltwater and Suspended Sediment Dynamics in Multi-branched Urban Tidal Estuaries

Casila, Joan Cecilia; Azhikodan, Gubash; Yokoyama, Kenichi; Fukushima, Keitaro; Terajima, Ryuta

doi:10.2208/jscejer.73.i_347

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…The addition of either salt solution or freshwater to the experimental tanks to abruptly change the salinity was done gradually within 30 minutes (only during the onset of the salinity change). The time frame follows what was recorded by Casila et al (2017) in Shakuji river estuary, Japan where salinity fluctuated within 30 minutes after freshwater intrusion.…”

Section: Experimental Designmentioning

confidence: 67%

Effect of Abrupt Salinity Change in the Survival of Asian Green Mussel Perna viridis (Linnaeus, 1758) Spats

PİCOY-GONZALES

Laureta

2022

Marine Science and Technology Bulletin

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Salinity is one of the key environmental factors that affects the growth and survival of marine organisms including mussels. Five different salinity levels (40, 30, 20, 10 and 5 ppt) were used to test the effect of abrupt salinity change in the survival of hatchery-produced spats of Asian green mussel Perna viridis (Linnaeus, 1758). Spats were stocked with a density of 30 individuals per 6-L tank. Salinity manipulation was conducted after 2 days from the date of stocking. Based on the results, abrupt change and prolonged exposure to lower salinities particularly of 5 and 10 ppt (up to 5 days) are detrimental to P. viridis spats.The critical time for P. viridis spats wherein they could seclude themselves from the persistent lower salinities is 28 hours from its exposure. After which, mortality could be high at about 50% and will continue in the succeeding days if low salinity persists. Critically, no single spat can survive until the 4 th day of continuous exposure to very low salinity of 5 ppt. Nevertheless, surviving individuals could still recover if salinity will return to optimum levels. Additionally, spats can readily adjust to abrupt change up to 10 ppt from the optimum salinity level as seen in the high survival in 20 and 40 ppt.

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Section: Experimental Designmentioning

confidence: 67%

Effect of Abrupt Salinity Change in the Survival of Asian Green Mussel Perna viridis (Linnaeus, 1758) Spats

PİCOY-GONZALES

Laureta

2022

Marine Science and Technology Bulletin

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“…No conductivity data was available for the R. Liffey during the sampling campaign, but all samples were taken within 10 cm of the surface, where water remains as a freshwater area at the top layer (~15 cm) as salinity increases with depth [ 124 , 126 ]. Rainfall also decreases salinity levels [ 130 , 131 ], and the top water layer has been shown to have lower salinity in wet seasons [ 126 ]. Daily total precipitation (mm) data can be found in Figure S5 for all rivers, where precipitation occurred in close proximity or even on the day of sampling for the R. Liffey and R. Thames.…”

Section: Methodsmentioning

confidence: 99%

International Comparison, Risk Assessment, and Prioritisation of 26 Endocrine Disrupting Compounds in Three European River Catchments in the UK, Ireland, and Spain

et al. 2023

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Endocrine-disrupting compounds (EDCs) constitute a wide variety of chemistries with diverse properties that may/can pose risks to both humans and the environment. Herein, a total of 26 compounds, including steroids, flame retardants, and plasticizers, were monitored in three major and heavily urbanized river catchments: the R. Liffey (Ireland), the R. Thames (UK), and the R. Ter (Spain), by using a single solid-phase extraction liquid chromatography-mass spectrometry (SPE-LC-MS/MS) method. Occurrence and frequency rates were investigated across all locations over a 10-week period, with the highest concentration obtained for the flame retardant tris(2-chloroethyl) phosphate (TCEP) at 4767 ng∙L−1 in the R. Thames in Central London. Geographical variations were observed between sites and were partially explained using principal component analysis (PCA) and hierarchical cluster analysis (HCA). In particular, discrimination between the R. Ter and the R. Thames was observed based on the presence and concentration of flame retardants, benzotriazole, and steroids. Environmental risk assessment (ERA) across sites showed that caffeine, a chemical marker, and bisphenol A (BPA), a plasticizer, were classified as high-risk for the R. Liffey and R. Thames, based on relative risk quotients (rRQs), and that caffeine was classified as high-risk for the R. Ter, based on RQs. The total risks at each location, namely ΣRQriver, and ΣrRQriver, were: 361, 455, and 723 for the rivers Liffey, Thames, and Ter, respectively. Caffeine, as expected, was ubiquitous in all 3 urban areas, though with the highest RQ observed in the R. Ter. High contributions of BPA were also observed across the three matrices. Therefore, these two compounds should be prioritized independently of location. This study represents a comprehensive EDC monitoring comparison between different European cities based on a single analytical method, which allowed for a geographically independent ERA prioritization to be performed.

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Assessing dissolved oxygen dynamics in Pasig River, Philippines: A HEC-RAS modeling approach during the COVID-19 pandemic

Casila,

Nicolas,

Duka

et al. 2024

Water Practice &Amp; Technology

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The water quality in Pasig River has been impacted by urbanization, industrialization, and the pandemic conditions. This study involved comparative analysis of dissolved oxygen (DO) levels before and during the pandemic. Field measurements, including water temperature, salinity, and DO, were conducted during neap and spring tides. To further understand and simulate DO distribution, a one-dimensional mathematical model, specifically Hydrologic Engineering Center-River Analysis System, was employed. Results showed that DO increased during the pandemic, ranging from 3.26 to 7.25 and 1.08 to 5.69 mg/L during neap and spring tide. From the minimum standard DO level, out of eight stations, seven passed during neap tide, while one station passed during spring tide. Salinity levels were higher during spring tide, which may have affected the DO. Salt intrusion was evident until 4 km from the confluence. The hydraulic model yielded average water level differences of 5.1 and 8.3 cm during calibration and validation, respectively. The DO calibration and simulation exhibited very good statistical evaluation outcomes, with values of 0.9 for Nash-Sutcliffe Efficiency and 0.3 for Root Mean Standard Deviation Ratio. These findings hold significant potential for formulation of water quality enhancement plans and implementation of solid waste management and pollution policies.

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Effect of Rainfall on Saltwater and Suspended Sediment Dynamics in Multi-branched Urban Tidal Estuaries

Cited by 4 publications

References 9 publications

Effect of Abrupt Salinity Change in the Survival of Asian Green Mussel Perna viridis (Linnaeus, 1758) Spats

Effect of Abrupt Salinity Change in the Survival of Asian Green Mussel Perna viridis (Linnaeus, 1758) Spats

International Comparison, Risk Assessment, and Prioritisation of 26 Endocrine Disrupting Compounds in Three European River Catchments in the UK, Ireland, and Spain

Assessing dissolved oxygen dynamics in Pasig River, Philippines: A HEC-RAS modeling approach during the COVID-19 pandemic

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