Assessment of the impact of climate change on surface hydrological processes using SWAT: a case study of Omo-Gibe river basin, Ethiopia

Chaemiso, Shiferaw E.; Abebe, Adane; Pingale, Santosh Murlidhar

doi:10.1007/s40808-016-0257-9

Cited by 76 publications

(28 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This model simulates the production of water and sediments in large-scale watersheds, complex basins, with various soil types, land uses and management conditions; it also simulates the effect of agronomic practices or any other activity on water quality [12,13]. It has been used in various situations, especially in areas known for their environmental vulnerability [14]. The model has proven efficiency in semi-arid conditions in many cases over the world (California, Mexico, Spain, Morocco, Tunisia, Iran, Italy…) [15,16,17,18,19,20].…”

Section: Introductionmentioning

confidence: 99%

SWAT streamflow modeling for hydrological components’ understanding within an agro - sylvo - pastoral watershed in Morocco

Brouziyne¹,

Abouabdillah²,

Bouabid³

et al. 2018

jmes

View full text Add to dashboard Cite

Being generally described as coherent entities in hydrological sense, watersheds are considered as study units to assess hydrological cycles and to come up with water management strategies. Hydrological modeling is a tool that can offer the chance to achieve these goals. The model Soil and Water Assessment Tool (SWAT) has been widely used in various parts of the world to support decision making on water management, and proved its efficiency in many arid and semi-arid areas even when different economical activities are held in the watershed (farming, pasture, forestry...). In this study, the SWAT model has been applied over R'dom watershed, agro-sylvo-pastoral basin located in a semi-arid area in North-Western Morocco, with the aim to simulate the hydrological processes occurring in the study basin as a preliminary step. The simulation was performed across the period 2004 to 2009 and gave satisfactory goodness-of-fit levels in daily time step (NSE= 0.58, R 2 = 0.79, PBIAS=19% during calibration and NSE=0.65, R 2 = 0.73, PBIAS=20% during validation). The results of the study showed that the water balance in R'dom watershed is dominated by evapotranspiration (61% of rainfall); surface runoff and water yield represent 8.3% and 25.2% of rainfall respectively. The water resources distribution within the watershed is uneven and follows a decreasing gradient matching the flow direction. The SWAT model succeeded to reflect the different hydrological processes in the study watershed and can be used to build integrated watershed management strategies within the studied basin and in other similar contexts.

show abstract

Section: Introductionmentioning

confidence: 99%

SWAT streamflow modeling for hydrological components’ understanding within an agro - sylvo - pastoral watershed in Morocco

Brouziyne¹,

Abouabdillah²,

Bouabid³

et al. 2018

jmes

View full text Add to dashboard Cite

show abstract

“…The problem of sedimentation is aggravated by human activities and climate change. A study conducted by Belete [7] on Lake Hawasa showed that sedimentation caused the rise in the lake's level.The effects of climate change on water resources have been widely studied [8][9][10][11][12][13]. However, such potential effects on sediment yield have received comparatively little attention.…”

mentioning

confidence: 99%

“…The effects of climate change on water resources have been widely studied [8][9][10][11][12][13]. However, such potential effects on sediment yield have received comparatively little attention.…”

mentioning

confidence: 99%

The Effect of Climate Change on Loss of Lake Volume: Case of Sedimentation in Central Rift Valley Basin, Ethiopia

et al. 2018

View full text Add to dashboard Cite

Evaluating the impact of climate change on sediment yield has become one of the major topics in climate research. The purpose of this study was to investigate sediment yield contribution to lake volume change under changing climatic conditions in the Central Rift Valley Basin. The ensemble mean of five regional climate models (RCMs) in the coordinated regional climate downscaling experiment (CORDEX)-Africa was considered for the purpose of this study. The climate variables (precipitation, minimum and maximum temperatures) in RCMs were bias corrected against observed data using linear scaling (LS), power transformation (PT), variance of scaling (VS), and quantile mapping (QM). Two emission scenarios, the Representative Concentration Pathways, RCP4.5 and RCP8.5, were considered for the future scenario period . Better results were obtained when the ensemble values of the bias correction methods were used. Hence, the projected values of climate variables after bias correction were used in the Soil and Water Assessment Tool (SWAT) hydrological model to estimate the sediment yield contribution to lake volume change due to climate change. The results show that the average projected precipitation will decrease by 7.97% and 2.55% under RCP4.5 and RCP8.5, respectively. On average, the maximum temperature will increase by 1.73 • C and 2.36 • C under RCP4.5 and RCP8.5, respectively, while the minimum temperature will increase by 2.16 • C and 3.07 • C under RCP4.5 and RCP8.5, respectively. The average annual sediment yield contributions to Lake Ziway were 431.05 ton/km 2 and 322.82 ton/km 2 for the Meki and Ketar rivers, respectively, in the historical period . The study also reveals that the annual sediment yield that was estimated for the Meki River was 323 ton/km 2 and 382 ton/km 2 under RCP4.5 and under RCP8.5, respectively. The sediment estimations for the Ketar River were 157 ton/km 2 and 211 ton/km 2 under RCP4.5 under RCP8.5, respectively. This will decrease the rate of volume change in Lake Ziway by 38% under RCP4.5 and by 23% under RCP8.5. The results show that the life expectancy of the lake is likely to increase under climate change scenarios. This will help water resources managers make informed decisions regarding the planning, management, and mitigation of the river basins.Hydrology 2018, 5, 67 2 of 18 reservoirs, ponds, and rivers. The sedimentation of the water bodies reduces their capacity and the useful lifespan of the reservoir. Sediment yield can be described as the amount of sediment that would enter into a reservoir located at the outlet of the basin [1]. It is the net result of soil erosion and processes of sediment accumulation, so it depends on variables that control water and sediment discharge to reservoirs [2]. Sediment yield is influenced by many factors, which include topography, soil, climate, land use, and drainage characteristics [3][4][5][6]. The problem of sedimentation is aggravated by human activities and climate change. A study conducted by Belete [7] on Lake Hawasa showed that sediment...

show abstract

“…Correction factors were computed from the statistics of the observed and the simulated variables. The principle of this method shows the mean and the standard deviation of the daily precipitation data becoming equal to those of the observed data [59][60][61].…”

Section: Bias Correction Methodsmentioning

confidence: 99%

Evaluation of the Impacts of Climate Change on Sediment Yield from the Logiya Watershed, Lower Awash Basin, Ethiopia

et al. 2019

View full text Add to dashboard Cite

It is anticipated that climate change will impact sediment yield in watersheds. The purpose of this study was to investigate the impacts of climate change on sediment yield from the Logiya watershed in the lower Awash Basin, Ethiopia. Here, we used the coordinated regional climate downscaling experiment (CORDEX)-Africa data outputs of Hadley Global Environment Model 2-Earth System (HadGEM2-ES) under representative concentration pathway (RCP) scenarios (RCP4.5 and RCP8.5). Future scenarios of climate change were analyzed in two-time frames: 2020–2049 (2030s) and 2050–2079 (2060s). Both time frames were analyzed using both RCP scenarios from the baseline period (1971–2000). A Soil and Water Assessment Tool (SWAT) model was constructed to simulate the hydrological and the sedimentological responses to climate change. The model performance was calibrated and validated using the coefficient of determination (R2), Nash–Sutcliffe efficiency (NSE), and percent bias (PBIAS). The results of the calibration and the validation of the sediment yield R2, NSE, and PBIAS were 0.83, 0.79, and −23.4 and 0.85, 0.76, and −25.0, respectively. The results of downscaled precipitation, temperature, and estimated evapotranspiration increased in both emission scenarios. These climate variable increments were expected to result in intensifications in the mean annual sediment yield of 4.42% and 8.08% for RCP4.5 and 7.19% and 10.79% for RCP8.5 by the 2030s and the 2060s, respectively.

show abstract

Assessment of the impact of climate change on surface hydrological processes using SWAT: a case study of Omo-Gibe river basin, Ethiopia

Cited by 76 publications

References 10 publications

SWAT streamflow modeling for hydrological components’ understanding within an agro - sylvo - pastoral watershed in Morocco

SWAT streamflow modeling for hydrological components’ understanding within an agro - sylvo - pastoral watershed in Morocco

The Effect of Climate Change on Loss of Lake Volume: Case of Sedimentation in Central Rift Valley Basin, Ethiopia

Evaluation of the Impacts of Climate Change on Sediment Yield from the Logiya Watershed, Lower Awash Basin, Ethiopia

Contact Info

Product

Resources

About