A catchment scale assessment of increased rainfall and storm intensity on erosion and sediment transport for Northern Australia

Hancock, Greg

doi:10.1016/j.geoderma.2009.07.003

Cited by 38 publications

(29 citation statements)

References 46 publications

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“…Coulthard et al, 2000), commonly called the "perturbation method" or "delta change" approach , or repeating data from years containing larger flood events (e.g. Hancock, 2009). The simplest approaches ignore the variability in rainfall events and even the more sophisticated methods used thus far greatly simplify the role of flood frequency, magnitude and extreme events on sediment delivery and channel response.…”

Section: T J Coulthard Et Al: Using the Ukcp09 Probabilistic Scenamentioning

confidence: 99%

Using the UKCP09 probabilistic scenarios to model the amplified impact of climate change on drainage basin sediment yield

Coulthard

Ramírez

Fowler

et al. 2012

Hydrol. Earth Syst. Sci.

103

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Abstract. Precipitation intensities and the frequency of extreme events are projected to increase under climate change. These rainfall changes will lead to increases in the magnitude and frequency of flood events that will, in turn, affect patterns of erosion and deposition within river basins. These geomorphic changes to river systems may affect flood conveyance, infrastructure resilience, channel pattern, and habitat status as well as sediment, nutrient and carbon fluxes. Previous research modelling climatic influences on geomorphic changes has been limited by how climate variability and change are represented by downscaling from global or regional climate models. Furthermore, the non-linearity of the climatic, hydrological and geomorphic systems involved generate large uncertainties at each stage of the modelling process creating an uncertainty "cascade".This study integrates state-of-the-art approaches from the climate change and geomorphic communities to address these issues in a probabilistic modelling study of the Swale catchment, UK. The UKCP09 weather generator is used to simulate hourly rainfall for the baseline and climate change scenarios up to 2099, and used to drive the CAESAR landscape evolution model to simulate geomorphic change. Results show that winter rainfall is projected to increase, with larger increases at the extremes. The impact of the increasing rainfall is amplified through the translation into catchment runoff and in turn sediment yield with a 100 % increase in catchment mean sediment yield predicted between the baseline and the 2070-2099 High emissions scenario. Significant increases are shown between all climate change scenarios and baseline values. Analysis of extreme events also shows the amplification effect from rainfall to sediment delivery with even greater amplification associated with higher return period events. Furthermore, for the 2070-2099 High emissions scenario, sediment discharges from 50-yr return period events are predicted to be 5 times larger than baseline values.

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Section: T J Coulthard Et Al: Using the Ukcp09 Probabilistic Scenamentioning

confidence: 99%

Using the UKCP09 probabilistic scenarios to model the amplified impact of climate change on drainage basin sediment yield

Coulthard

Ramírez

Fowler

et al. 2012

Hydrol. Earth Syst. Sci.

103

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“…Recent studies focused on the impact of climate change on sediment transport (e.g. Gomez et al, 2009;Hancock, 2009;Walling, 2009;Hancock and Coulthard, 2011;Knight and Harrison, 2013;Lu et al, 2013). showed on an example that sediment transport may increase due to the increasing discharge or decrease because of the enhanced tempera-1356 M. Achite and S. Ouillon: Recent changes in climate, hydrology and sediment load in the Wadi Abd ture.…”

Section: Introductionmentioning

confidence: 99%

Recent changes in climate, hydrology and sediment load in the Wadi Abd, Algeria (1970–2010)

Achite

Ouillon

2016

Hydrol. Earth Syst. Sci.

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Abstract.Here we investigate the changes of temperature, precipitation, river runoff and sediment transport in the Wadi Abd in northwest Algeria over a time series of 40 hydrological years . Temperature increased and precipitation decreased with the reduction in rainfall being relatively higher during the rainy season. A shift towards an earlier onset of first rains during summer was also found with cascading effects on hydrology (hydrological regimes, vegetation, etc.) and thus on erosion and sediment yield. During the 1980s, the flow regime shifted from perennial to intermittent with an amplification of the variations of discharge and a modification of the sediment regime with higher and more irregular suspended particulate flux. Sediment flux was shown to almost double every decade from the 1970s to the 2000s. The sediment regime shifted from two equivalent seasons of sediment yield (spring and fall) to a single major season regime. In the 2000s, autumn produced over 4 times more sediment than spring. The enhanced scatter of the C-Q pairs denotes an increase of hysteresis phenomena in the Wadi Abd that is probably related to the change in the hydrologic regime. At the end of the period, due to irregularity of the discharge, the ability of a rating curve to derive suspended sediment concentration from river discharge was poor.

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“…Barnett et al (2008) and others suggest that climate change can increase storm frequency > 10 times current rates in arid environments (Iwashima & Yamamoto, 1993;Hancock, 2009). Long-term environmental impacts could be increased with climate change according to current predictions (e.g.…”

Section: Erosion Estimatesmentioning

confidence: 99%

“…Recent studies on climate change predictive models have considered whether climate can affect environmental conditions with further desertification, steady state conditions, or increased precipitation (Giannini et al, 2008;Giorgi & Lionello, 2008;Hancock, 2009). Understanding the potential effects of climate change in regions where current conditions indicate a stable, low impact environment is imperative when considering pathways for abandoned mine waste to impact a wider area.…”

Section: Introductionmentioning

confidence: 99%

Potential Effects of Environmental Change on Mining Wastes in a Hyperarid Climate

Sims¹,

Hooda²,

Gillmore³

2012

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Three desert washes were sampled to evaluate the transport of contaminated sediments from abandoned mining sites to downwash environments. The area of concern is an extreme arid climate considered stable and not to pose pathways for contaminated sediments to impact downwash environments. Research of mine wastes in Nelson, Nevada has shown that residual geogenic and anthropogenic trace elements have been mobilized in surface sediments as a result of storm event. Cyanide and trace elements, especially mercury and lead, have transported to 6000 m downwash from source areas. Short term environmental impacts appear to be minimal because of present-day environmental conditions. However, climate shifts caused by the El Nino Southern Oscillations or even a dramatic climate shift might increase regional precipitation promoting a more rapid erosion of contaminated sediment. Currently, wash sediments do not contain levels of CN -or trace elements that pose threats to the environment; however, if erosion and transport of mining waste increased because of additional precipitation, then CN -and trace elements loading in storm water would increase, with their possibly delivery to Lake Mohave.

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A catchment scale assessment of increased rainfall and storm intensity on erosion and sediment transport for Northern Australia

Cited by 38 publications

References 46 publications

Using the UKCP09 probabilistic scenarios to model the amplified impact of climate change on drainage basin sediment yield

Using the UKCP09 probabilistic scenarios to model the amplified impact of climate change on drainage basin sediment yield

Recent changes in climate, hydrology and sediment load in the Wadi Abd, Algeria (1970–2010)

Potential Effects of Environmental Change on Mining Wastes in a Hyperarid Climate

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