Moreton Bay Raw Data.xlsx
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modified on 2021-04-26, 08:13 Catchment area (m2), AHD (m) and
volume (m3) for each creek were determined using 1 second shuttle
radar topographic mission (SRTM) Digital Elevation Model (DEM) derived from
airborn laser scanning surveys (LiDAR, Department of Natural Resources and
Mines) using the ArcMap Hydrology toolbox (ArcGIS 10.5.1). Briefly, the DEMs were used to determine the
catchment boundary of each creek using the Spatial Analyst toolbox. Area and
volume (based on water depth) at each selected AHD were extracted using the 3D
Analyst toolbox and fit to a polynomial curve to determine actual volume of
water at 10 minute intervals within each creek over the time series. Discharge
(m3/ 10 min-1) was calculated as the difference between
creek volumes at each time point.
Water samples were collected directly with low flow from the pump into a
450 mL amber glass Schott bottle filled from the bottom up ensuring no bubbles
during collection. Creek water was then subsampled and preserved for later
analysis. For isoprene, 70 mL was syringed from the Schott bottle into 100 mL
amber glass sample bottles filling from bottom up ensuring no bubbles and
crimped with Teflon septa crimp caps (PTFE/S, Agilent Technologies, USA). Samples
were poisoned with 150 µL 8% solution HgCl2 using a needle syringe
and stored in the dark at 4 °C. Isoprene was analysed within 30 days of collection using cumulative
headspace injections coupled with gas chromatograph-mass spectrometer (GC-MS).
