Modelling hydrological processes and identifying soil erosion sources in a tropical catchment of the Great Barrier Reef using SWAT
Article
Article Title | Modelling hydrological processes and identifying soil erosion sources in a tropical catchment of the Great Barrier Reef using SWAT |
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ERA Journal ID | 123718 |
Article Category | Article |
Authors | Rafiei, Vahid (Author), Ghahramani, Afshin (Author), An-Vo, Duc-Anh (Author) and Mushtaq, Shahbaz (Author) |
Journal Title | Water: an open access journal |
Journal Citation | 12 (8), pp. 2179-2206 |
Number of Pages | 28 |
Year | 2020 |
Publisher | MDPI AG |
Place of Publication | Switzerland |
ISSN | 2073-4441 |
Digital Object Identifier (DOI) | https://doi.org/10.3390/w12082179 |
Web Address (URL) | https://www.mdpi.com/2073-4441/12/8/2179 |
Abstract | Study region: North Johnstone catchment, located in the north east of Australia. The catchment has wet tropical climate conditions and is one of the major sediment contributors to the Great Barrier Reef. Study focus: The purpose of this paper was to identify soil erosion hotspots through simulating hydrological processes, soil erosion and sediment transport using the Soil and Water Assessment Tool (SWAT). In particular, we focused on predictive uncertainty in the model evaluations and presentations—a major knowledge gap for hydrology and soil erosion modelling in the context of Great Barrier Reef catchments. We carried out calibration and validation along with uncertainty analysis for streamflow and sediment at catchment and sub-catchment scales and investigated details of water balance components, the impact of slope steepness and spatio-temporal variations on soil erosion. The model performance in simulating actual evapotranspiration was compared with those of the Australian Landscape Water Balance (AWRA-L) model to increase our confidence in simulating water balance components. New hydrological insights for the region: The spatial locations of soil erosion hotspots were identified and their responses to different climatic conditions were quantified. Furthermore, a set of land use scenarios were designed to evaluate the effect of reforestation on sediment transport. We anticipate that protecting high steep slopes areas, which cover a relatively small proportion of the catchment (4–9%), can annually reduce 15–26% sediment loads to the Great Barrier Reef. |
Keywords | catchment modelling; uncertainty analysis; water balance; sediment; actual evapotranspiration |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 370704. Surface water hydrology |
370510. Stratigraphy (incl. biostratigraphy, sequence stratigraphy and basin analysis) | |
370509. Sedimentology | |
Byline Affiliations | Centre for Applied Climate Sciences |
Centre for Sustainable Agricultural Systems | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5ww8/modelling-hydrological-processes-and-identifying-soil-erosion-sources-in-a-tropical-catchment-of-the-great-barrier-reef-using-swat
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