The influence of climate change on suspended sediment transport in Danish rivers

Thodsen, Hans; Hasholt, Bent; Kjaersgaard, Jeppe

doi:10.1002/hyp.6652

Cited by 50 publications

(30 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…three times in the next 90 years. Thus, modelling near-future discharge and base level changes gives rise to results with very high uncertainty (Andersson et al, 2006;Fowler et al, 2007;Quilbé et al, 2008;Thodsen et al, 2008). The diffi culty of specifying any other upstream boundary condition than sediment supply equal to transport capacity in near-future simulations adds to this uncertainty (Gomez et al, 2009), though our sensitivity tests did not produce radically different results under alternative assumptions.…”

Section: Discussionmentioning

confidence: 83%

Numerical modelling of climate change impacts on Saint‐Lawrence River tributaries

Verhaar

Biron

Ferguson

et al. 2010

Earth Surf Processes Landf

View full text Add to dashboard Cite

The impacts of climate-induced changes in discharge and base level in three tributaries of the Saint-Lawrence River, Québec, Canada, are modelled for the period 2010-2099 using a one-dimensional morphodynamic model. Changes in channel stability and bed-material delivery to the Saint-Lawrence River over this period are simulated for all combinations of seven tributary hydrological regimes (present-day and those predicted using three global climate models and two greenhouse gas emission scenarios) and three scenarios of how the base level provided by the Saint-Lawrence River will alter (no change, gradual fall, step fall). Even with no change in base level the projected discharge scenarios lead to an increase in average bed material delivery for most combinations of river and global climate model, although the magnitude of simulated change depends on the choice of global climate model and the trend over time seems related to whether the river is currently aggrading, degrading or in equilibrium. The choice of greenhouse gas emission scenario makes much less difference than the choice of global climate model. As expected, a fall in base level leads to degradation in the rivers currently aggrading or in equilibrium, and amplifi es the effects of climate change on sediment delivery to the Saint-Lawrence River. These differences highlight the importance of investigating several rivers using several climate models in order to determine trends in climate change impacts.

show abstract

Section: Discussionmentioning

confidence: 83%

Numerical modelling of climate change impacts on Saint‐Lawrence River tributaries

Verhaar

Biron

Ferguson

et al. 2010

Earth Surf Processes Landf

View full text Add to dashboard Cite

show abstract

“…Thodsen et al (2008) studied the influence of climate change on river discharge and suspended sediment transport in rivers in Denmark on the basis of modelled changes in land use/land cover. Ficklin et al (2009) studied the hydrological responses to variations of atmospheric CO 2 (550 and 970 ppm), temperature (+1.1 and +6.4 • C) and precipitation (0%, ±10%, and ±20%) in the agricultural San Joaquin watershed in California, USA.…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature change on water discharge, and sediment and nutrient loading in the lower Pearl River basin based on SWAT modelling

Chen

Wang

et al. 2011

Hydrological Sciences Journal

View full text Add to dashboard Cite

The impact of climate change on hydrological processes and nutrient input is one of the major uncertainties in projecting future global warming. The Soil and Water Assessment Tool (SWAT) model is applied to simulate the effects of temperature on the hydrology and sediment and nutrient load in the lower Pearl River Basin, South China. Calibration and validation results for SWAT showed that the Yamen estuary is appropriate for simulating the impacts of temperature change on both hydrological processes and nutrient input. The possible temperature change scenarios were set at T-2, T-1.5, T-1, T-0.5, T+0.5, T+1, T+1.5, T+2, T+2.5, T+3 • C compared to the current temperature, T• C. The results showed that the relative variation of discharge with temperature was slight. The sediment load at T+3• C is increased by 13.58% compared to that at T • C. Inorganic N and P inputs to the Yamen estuary showed an increasing trend with the temperature increase from T-2• C to T+3 • C. Global warming can reduce the vegetation land cover by slowing plant growth, which will aggravate the water and soil loss. Temperature changes would have an effect on mineralization and nitrification by changing soil temperature and temperatures. The warming is projected to cause an increase of sediment and nutrient load into the estuary and accelerate eutrophication in the coastal area.

show abstract

“…In these Canadian rivers, the greatest hydrological and fluvial transport changes were simulated during the winter (with increasing frequency of high discharges) and spring seasons, characterized by decreasing discharge (Boyer et al, 2010). This is similar to some catchment-scale sediment transport analyses, which have forecast increased wintertime sediment transport in their study sites in the northern hemisphere Thodsen et al, 2008). In particular, the extension of sediment accumulation zones was forecast by Boyer et al (2010), whilst the projected increase in sediment supply was shown to modify the extent of freshwater wetlands at the mouth of the studied tributaries with feedback effects on local flow and sediment distributions.…”

Section: Input Data and External Forcing Conditionsmentioning

confidence: 97%

Prospects and challenges of simulating river channel response to future climate change

Lotsari

Thorndycraft

Alho

2015

Progress in Physical Geography: Earth and Environment

View full text Add to dashboard Cite

Due to the predicted impacts of future climate on hydrology, morphological changes to river channels are expected. Quantifying the magnitudes and rates of future channel change is important for sustainable river channel management. To date, reviews of simulation approaches for investigating river channels and the modelling of environmental change impacts on channel form and process have focused on contemporary process or palaeo perspectives. Hence, herein we review numerical modelling approaches available for reach-scale simulation of future river channels and the predicted in-channel hydro-and morphodynamic changes modelled. We found that despite their widespread availability, hydrodynamic, morphodynamic and cellular models have yet to be used routinely in future in-channel simulations, with cellular models in particular under-represented. Our review shows that predictions of within-channel changes vary greatly between hydro-climatic regions and under contrasting climate change scenarios, mainly due to varying input discharge scenarios; however, increased sediment transport and flood risk are usually predicted. Key challenges in simulating future channel change include representations of external forcing conditions, adequate temporal and spatial scales, transport equations, changing channel materials and lateral erosion; calibration and validation; simulation chains with multiple models; and identification of feedback systems and nonlinearity. Nevertheless, despite these challenges, models with increasing complexity have recently been developed and so there is increasing potential in their application. One-dimensional hydro-and morphodynamic simulations, and cellular models, can be modified to reflect the requirements of future representations, such as grain size properties, whilst there is also now an increasing capability to include a greater quantity of external forcing conditions. Some studies, however, have demonstrated the need to develop twodimensional models for application in centennial-scale studies. We recommend that a wider range of Downloaded from scenarios and the combined effects of multiple external forcing factors should be included, whilst studies are also needed from more hydrologically diverse reaches.

show abstract

The influence of climate change on suspended sediment transport in Danish rivers

Cited by 50 publications

References 31 publications

Numerical modelling of climate change impacts on Saint‐Lawrence River tributaries

Numerical modelling of climate change impacts on Saint‐Lawrence River tributaries

Effects of temperature change on water discharge, and sediment and nutrient loading in the lower Pearl River basin based on SWAT modelling

Prospects and challenges of simulating river channel response to future climate change

Contact Info

Product

Resources

About