Short-term variability of physico-chemical parameters and the estimated transport of filterable nutrients and chlorophyll-a in the urbanised coombabah lake and Coombabah Creek system, Southern Moreton Bay, Australia

R. J.K. Dunn, A. Ali, C. J. Lemckert, P. R. Teasdale, D. T. Welsh

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Extensive urban development has occurred within the Coombabah Creek catchment and surrounds over the last two decades, resulting in concerns about degrading water quality. Water quality was investigated three times during summer and three times during autumn/winter at two sites: within Coombabah Lake and at several km downstream within Coombabah Creek. Physico-chemical parameters, suspended solids, chlorophyll-a and filterable nutrients (reactive PO4 3-, NO2 -, NO3 - and NH3 -) were measured hourly for 13 hours in order to compare the water quality under different tidal conditions at each site. Bathymetric and hydrological data were also collected, which allowed short-term nutrient loads to be estimated. From these measurements, the net transport of filterable nutrients and chlorophyll-a into Coombabah Lake and the intratidal variability of Coombabah Creek and Lake waters were determined. Physico-chemical parameters, suspended solids and chlorophyll-a concentrations demonstrated characteristic cyclic variations with the influence of tidal and diurnal cycles apparent. Despite elevated nutrient concentrations, chlorophyll-a values indicated an oligotrophic-mesotrophic environment, with concentrations ranging between 0.11-3.53 μg L-1. Maximum concentrations occurred during ebb tides, coinciding with periods of increased solar radiation. Elevated total suspended solids were observed during increased current velocities during low tide periods and greater wind speeds within the lake. Filterable nutrient concentrations and transport estimations also demonstrated tidal influences, with increased concentrations observed during sampled high tide phases, indicating increased inputs of nutrients originating from sources other than the creek and lake. Observed reactive PO4 3-, NOx and NH3 - concentrations exceeded Broadwater sub-region values within the Queensland Water Quality Guidelines (2006)

Original languageEnglish
Pages (from-to)1062-1068
Number of pages7
JournalJournal of Coastal Research
Issue number50
Publication statusPublished - Dec 2007
Externally publishedYes

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chlorophyll a
nutrient
lake
water quality
tide
mesotrophic environment
oligotrophic environment
current velocity
urban development
lake water
parameter
chemical
creek
solar radiation
wind velocity
autumn
catchment
winter
summer

Cite this

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title = "Short-term variability of physico-chemical parameters and the estimated transport of filterable nutrients and chlorophyll-a in the urbanised coombabah lake and Coombabah Creek system, Southern Moreton Bay, Australia",
abstract = "Extensive urban development has occurred within the Coombabah Creek catchment and surrounds over the last two decades, resulting in concerns about degrading water quality. Water quality was investigated three times during summer and three times during autumn/winter at two sites: within Coombabah Lake and at several km downstream within Coombabah Creek. Physico-chemical parameters, suspended solids, chlorophyll-a and filterable nutrients (reactive PO4 3-, NO2 -, NO3 - and NH3 -) were measured hourly for 13 hours in order to compare the water quality under different tidal conditions at each site. Bathymetric and hydrological data were also collected, which allowed short-term nutrient loads to be estimated. From these measurements, the net transport of filterable nutrients and chlorophyll-a into Coombabah Lake and the intratidal variability of Coombabah Creek and Lake waters were determined. Physico-chemical parameters, suspended solids and chlorophyll-a concentrations demonstrated characteristic cyclic variations with the influence of tidal and diurnal cycles apparent. Despite elevated nutrient concentrations, chlorophyll-a values indicated an oligotrophic-mesotrophic environment, with concentrations ranging between 0.11-3.53 μg L-1. Maximum concentrations occurred during ebb tides, coinciding with periods of increased solar radiation. Elevated total suspended solids were observed during increased current velocities during low tide periods and greater wind speeds within the lake. Filterable nutrient concentrations and transport estimations also demonstrated tidal influences, with increased concentrations observed during sampled high tide phases, indicating increased inputs of nutrients originating from sources other than the creek and lake. Observed reactive PO4 3-, NOx and NH3 - concentrations exceeded Broadwater sub-region values within the Queensland Water Quality Guidelines (2006)",
keywords = "Estuarine system, Suspended solids, Tide cycle, Water quality parameters",
author = "Dunn, {R. J.K.} and A. Ali and Lemckert, {C. J.} and Teasdale, {P. R.} and Welsh, {D. T.}",
year = "2007",
month = "12",
language = "English",
pages = "1062--1068",
journal = "Journal of Coastal Research",
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TY - JOUR

T1 - Short-term variability of physico-chemical parameters and the estimated transport of filterable nutrients and chlorophyll-a in the urbanised coombabah lake and Coombabah Creek system, Southern Moreton Bay, Australia

AU - Dunn, R. J.K.

AU - Ali, A.

AU - Lemckert, C. J.

AU - Teasdale, P. R.

AU - Welsh, D. T.

PY - 2007/12

Y1 - 2007/12

N2 - Extensive urban development has occurred within the Coombabah Creek catchment and surrounds over the last two decades, resulting in concerns about degrading water quality. Water quality was investigated three times during summer and three times during autumn/winter at two sites: within Coombabah Lake and at several km downstream within Coombabah Creek. Physico-chemical parameters, suspended solids, chlorophyll-a and filterable nutrients (reactive PO4 3-, NO2 -, NO3 - and NH3 -) were measured hourly for 13 hours in order to compare the water quality under different tidal conditions at each site. Bathymetric and hydrological data were also collected, which allowed short-term nutrient loads to be estimated. From these measurements, the net transport of filterable nutrients and chlorophyll-a into Coombabah Lake and the intratidal variability of Coombabah Creek and Lake waters were determined. Physico-chemical parameters, suspended solids and chlorophyll-a concentrations demonstrated characteristic cyclic variations with the influence of tidal and diurnal cycles apparent. Despite elevated nutrient concentrations, chlorophyll-a values indicated an oligotrophic-mesotrophic environment, with concentrations ranging between 0.11-3.53 μg L-1. Maximum concentrations occurred during ebb tides, coinciding with periods of increased solar radiation. Elevated total suspended solids were observed during increased current velocities during low tide periods and greater wind speeds within the lake. Filterable nutrient concentrations and transport estimations also demonstrated tidal influences, with increased concentrations observed during sampled high tide phases, indicating increased inputs of nutrients originating from sources other than the creek and lake. Observed reactive PO4 3-, NOx and NH3 - concentrations exceeded Broadwater sub-region values within the Queensland Water Quality Guidelines (2006)

AB - Extensive urban development has occurred within the Coombabah Creek catchment and surrounds over the last two decades, resulting in concerns about degrading water quality. Water quality was investigated three times during summer and three times during autumn/winter at two sites: within Coombabah Lake and at several km downstream within Coombabah Creek. Physico-chemical parameters, suspended solids, chlorophyll-a and filterable nutrients (reactive PO4 3-, NO2 -, NO3 - and NH3 -) were measured hourly for 13 hours in order to compare the water quality under different tidal conditions at each site. Bathymetric and hydrological data were also collected, which allowed short-term nutrient loads to be estimated. From these measurements, the net transport of filterable nutrients and chlorophyll-a into Coombabah Lake and the intratidal variability of Coombabah Creek and Lake waters were determined. Physico-chemical parameters, suspended solids and chlorophyll-a concentrations demonstrated characteristic cyclic variations with the influence of tidal and diurnal cycles apparent. Despite elevated nutrient concentrations, chlorophyll-a values indicated an oligotrophic-mesotrophic environment, with concentrations ranging between 0.11-3.53 μg L-1. Maximum concentrations occurred during ebb tides, coinciding with periods of increased solar radiation. Elevated total suspended solids were observed during increased current velocities during low tide periods and greater wind speeds within the lake. Filterable nutrient concentrations and transport estimations also demonstrated tidal influences, with increased concentrations observed during sampled high tide phases, indicating increased inputs of nutrients originating from sources other than the creek and lake. Observed reactive PO4 3-, NOx and NH3 - concentrations exceeded Broadwater sub-region values within the Queensland Water Quality Guidelines (2006)

KW - Estuarine system

KW - Suspended solids

KW - Tide cycle

KW - Water quality parameters

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M3 - Article

SP - 1062

EP - 1068

JO - Journal of Coastal Research

JF - Journal of Coastal Research

SN - 0749-0208

IS - 50

ER -