ORCID Profile
0000-0001-6845-9940
Current Organisations
Maastricht University
,
CSIRO
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Publisher: Elsevier BV
Date: 05-2018
Publisher: CSIRO Publishing
Date: 2013
DOI: 10.1071/SR12282
Abstract: In order to elucidate the relationship between evaporation, salinisation, and annual water and salt balances in semi-arid and arid regions, hydrological and meteorological observations were undertaken over 3 years in a small, salinised, bare-soil, groundwater seepage area in Western Australia. This paper focuses on water behaviour near a bare saline soil surface during the dry summer. Analysis of observed data on soil vapour density using a vapour diffusion transfer model can account for the daily upward vapour flux from the soil surface that occurs in midsummer. The dry soil undergoes cycles of drying during the day, accompanied by salt crust formation and wetting during the night. In late summer, the same zones show a wetting trend owing to a marked atmospheric vapour invasion and condensation at night regardless of evaporation during daytime. The daily average vapour flux at the ground surface in mid- and late-summer, respectively, estimated through the vapour transfer model in the dry soil layer was ~0.35 and 0.03 mm/day. Comparison of vapour fluxes at the ground surface measured with a portable surface evaporimeter with modelled estimates of vapour transport in soil showed agreement of the proposed model to field results at low wind speed, but not at the higher wind speeds. This identifies the active role of turbulent surface wind speed on vapour transfer in the dry soil layer below the ground surface.
Publisher: Elsevier BV
Date: 12-2022
Publisher: American Geophysical Union (AGU)
Date: 2015
DOI: 10.1002/2014WR015779
Publisher: American Geophysical Union (AGU)
Date: 10-2022
DOI: 10.1029/2022WR031944
Abstract: Attributing nitrogen export to specific land use within heterogeneous catchments remains a challenge due to the spatio‐temporal variability in conditions influencing the mobilization and fate of nitrogen species. This study demonstrates that the measurement of dual stable isotopes of nitrate, taken along with routine tributary measurement of nitrogen in nitrate (NO 3 − ‐N) and ammonium (NH 4 + ‐N), aids in apportioning sources of the overall nitrogen load during wet periods. An inverse modeling technique was developed to estimate the land use‐specific export rates of NO 3 − ‐N and NH 4 + ‐N from the Caboolture River Catchment in Queensland, Australia. Measurements of nitrogen in streamflow at 51 locations during six s ling c aigns (May 2012 to April 2013) were made along with catchment geospatial data that was used to disaggregate sub‐catchments into six land use fractions. A hydrological model was applied to compute the runoff from each fraction and water routing through the stream network. This data was used within a nitrogen mixing model with inclusion δ 15 N NO3 and δ 18 O NO3 . The land uses specific export rate was computed inversely as the posterior of a Bayesian interference applied to the model. During higher rainfall periods when export rates were highest, the main land use exporting nitrogen was wetland (110 g/ha/day NO 3 − ‐N, 27 g/ha/day NH 4 + ‐N) resulted from mineralization and nitrification of organic N, followed by urban (16 g/ha/day NO 3 − ‐N, 2.3 g/ha/day NH 4 + ‐N). The advantage of using the dual isotopes in conjunction with the nitrogen concentration data was demonstrated by reduced uncertainty in the computed rates during the higher rainfall periods, relative to calculations without δ 15 N NO3 and δ 18 O NO3 .
Publisher: CSIRO
Date: 2011
DOI: 10.25919/SJJM-Q686
Publisher: Elsevier
Date: 2011
No related grants have been discovered for Jeffrey Vaughan Turner.