Use of salinity mixing models to estimate the contribution of creek water fecal indicator bacteria to an estuarine environment: Newport Bay, California

McLaughlin, Karen; Ahn, Jun Hyong; Litton, Rachel M.; Grant, Stanley B.

doi:10.1016/j.watres.2007.05.005

Cited by 17 publications

(8 citation statements)

References 21 publications

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“…Table 3 showed that salinity was found to have an adverse effect on FCs population although not very strong for areas that were susceptible to saline intrusions. This finding is consistent with other published works on the effect of salinity on FC (Solic & Krstulovic, 1992;Mallin et al, 1999;McLaughlin et al, 2007).…”

Section: Resultssupporting

confidence: 94%

Rainfalls And Salinity Effects On Fecal Coliform Most Probable Number (MPN) Index Distribution In A Beach Ridge-Shore Ridge System In Mengabang Telipot, Terengganu, Malaysia

Sathiamurthy¹,

Kwa²,

Ishak³

et al. 2021

BGSM

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A Holocene beach ridge and present day shore ridge system located in a rural area north east of Kuala Terengganu was studied. The relation between fecal coliform (FC) MPN Index (Most Probable Number) distribution with rainfalls and saline intrusions into the unconfined aquifer of the beach ridge–shore ridge system was examined. The probable primary source of the pollutants was also investigated in order to highlight the susceptibility of such aquifers to pollution. Six sampling sessions were made from September 2009 to January 2010. Three represent drier conditions and the other 3, heavier rainfalls corresponding to the northeast monsoon season. This sampling period represent a condition when this area was still not subjected to major coastal erosions and subsequent rock revetment work. Altogether, water samples were taken from 13 wells and 3 river stations. Physical-chemical measurements were made in-situ, while FC was tested at UMT laboratory. Essentially, the results indicated that the groundwater in the unconfined aquifer layer of the beach ridge was moderately to highly polluted with FC (up to 1600 MPN). In contrast, the shore ridge was only slightly polluted, whereas river stations had mixed conditions but generally worse than the beach ridge and shore ridge. These phenomena could be associated with salinity spatial-temporal variations. Samples from heavy rainfall conditions indicated lower pollution levels compared to drier conditions. This phenomenon could be associated with the availability of more infiltrated atmospheric water to dilute pollutants in a high hydraulic conductivity environment as the ridges are made of fine to coarse sands. The results underscore the sensitivity of such environment to pollution transport and distribution and hence implied special attention with regards to water resource management.

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Section: Resultssupporting

confidence: 94%

Rainfalls And Salinity Effects On Fecal Coliform Most Probable Number (MPN) Index Distribution In A Beach Ridge-Shore Ridge System In Mengabang Telipot, Terengganu, Malaysia

Sathiamurthy¹,

Kwa²,

Ishak³

et al. 2021

BGSM

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“…(3) Mixing ratios (Schemel et al, 2006;McLaughlin et al, 2007;Bickle et al, 2007). The concept has been generalized to multivariate mixing cell models Adar and Nativ, 2003;Dahan et al, 2004).…”

Section: End Membermentioning

confidence: 99%

An approach to identify urban groundwater recharge

Vàzquez-Suñé¹,

Carrera²,

Tubau³

et al. 2010

Preprint

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Evaluating the proportion in which waters from different origins are mixed in a given water sample is relevant for many hydrogeological problems, such as quantifying total recharge, assessing groundwater pollution risks, or managing water resources. Our work is motivated by urban hydrogeology, where waters with different chemical signature can be identified (losses from water supply and sewage networks, infiltration from surface runoff and other water bodies, lateral aquifers inflows, ...). The relative contribution of different sources to total recharge can be quantified by means of solute mass balances, but application is hindered by the large number of potential origins. Hence, the need to incorporate data from a large number of conservative species, the uncertainty in sources concentrations and measurement errors. We present a methodology to compute mixing ratios and end-members composition, which consists of (i) Identification of potential recharge sources, (ii) Selection of tracers, (iii) Characterization of the hydrochemical composition of potential recharge sources and mixed water samples, and (iv) Computation of mixing ratios and reevaluation of end-members. The analysis performed in a data set from samples of the Barcelona city aquifers suggests that the main contributors to total recharge are the water supply network losses (22%), the sewage network losses (30%), rainfall, concentrated in the non-urbanized areas (17%), from runoff infiltration (20%), and the Besòs River (11%). Regarding species, halogens (chloride, fluoride and bromide), sulfate, total nitrogen, and stable isotopes (18O2H, and 34S) behaved quite conservatively. Boron, residual alkalinity, EDTA and Zn did not. Yet, including these species in the computations did not affect significantly the proportion estimations

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“…Understanding the salinity variation in estuaries under different forcing events, such as tide, extreme drought, climate change and human interventions, is important for the management of estuarine water resources, the design of water-supply systems and the protection of diverse estuarine and mangrove species 4 12 13 14 15 . Therefore, salt water intrusion in the PRE has received substantial attention in recent years because of increases in the magnitude and frequency of salt water intrusion upstream that directly influenced the economic development of the southwest region of Bangladesh 9 16 .…”

mentioning

confidence: 99%

Salt Plug Formation Caused by Decreased River Discharge in a Multi-channel Estuary

Shaha

Cho

2016

Sci Rep

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Freshwater input to estuaries may be greatly altered by the river barrages required to meet human needs for drinking water and irrigation and prevent salt water intrusion. Prior studies have examined the salt plugs associated with evaporation and salt outwelling from tidal salt flats in single-channel estuaries. In this work, we discovered a new type of salt plug formation in the multi-channel Pasur River Estuary (PRE) caused by decreasing river discharges resulting from an upstream barrage. The formation of a salt plug in response to changes in river discharge was investigated using a conductivity-temperature-depth (CTD) recorder during spring and neap tides in the dry and wet seasons in 2014. An exportation of saline water from the Shibsa River Estuary (SRE) to the PRE through the Chunkhuri Channel occurred during the dry season, and a salt plug was created and persisted from December to June near Chalna in the PRE. A discharge-induced, relatively high water level in the PRE during the wet season exerted hydrostatic pressure towards the SRE from the PRE and thereby prevented the intrusion of salt water from the SRE to the PRE.

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Use of salinity mixing models to estimate the contribution of creek water fecal indicator bacteria to an estuarine environment: Newport Bay, California

Cited by 17 publications

References 21 publications

Rainfalls And Salinity Effects On Fecal Coliform Most Probable Number (MPN) Index Distribution In A Beach Ridge-Shore Ridge System In Mengabang Telipot, Terengganu, Malaysia

Rainfalls And Salinity Effects On Fecal Coliform Most Probable Number (MPN) Index Distribution In A Beach Ridge-Shore Ridge System In Mengabang Telipot, Terengganu, Malaysia

An approach to identify urban groundwater recharge

Salt Plug Formation Caused by Decreased River Discharge in a Multi-channel Estuary

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