- Title
- A linked surface water-groundwater modelling approach to more realistically simulate rainfall-runoff non-stationarity in semi-arid regions
- Creator
- Deb, Proloy; Kiem, Anthony S.; Willgoose, Garry
- Relation
- ARC.LP120200494 http://purl.org/au-research/grants/arc/LP120200494
- Relation
- Journal of Hydrology Vol. 575, p. 273-291
- Publisher Link
- http://dx.doi.org/10.1016/j.jhydrol.2019.05.039
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2019
- Description
- Interactions between surface water (SW) and groundwater (GW) have been identified as a major contributing factor to non-stationarity in rainfall-runoff relationships. However, because existing rainfall-runoff models do not realistically account for these SW-GW interactions, they fail to robustly simulate runoff during multi-year droughts, especially in arid and semi-arid catchments that are relatively flat. Therefore, this study introduces a linked SW-GW modelling approach and tests it under different climatic conditions (Average, Dry and Wet periods) in two heterogeneous, semi-arid catchments in southeast Australia (SEA). The linked SW-GW modelling approach includes a fully-distributed SW (i.e. rainfall-runoff) model (SWATgrid) and a three-dimensional finite-difference GW model (MODFLOW). The results show that the linked SW-GW modelling approach produces highly improved runoff simulations for the study catchments, especially during dry conditions. These findings demonstrate the importance of accounting for SW-GW interactions when conducting rainfall-runoff modelling and highlights that failing to do so will result in overestimation of runoff during droughts - this is salient given projections for hotter and drier futures in many semi-arid regions. Although the study is focused on SEA, the insights gained are highly applicable for water managers in any region that experience high hydroclimatic variability or change.
- Subject
- SWATgrid; modeflow; stream-aquifer interaction; groundwater; watershed hydrology; climate variability
- Identifier
- http://hdl.handle.net/1959.13/1413606
- Identifier
- uon:36645
- Identifier
- ISSN:0022-1694
- Language
- eng
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