SWAT based hydrological assessment and characterization of Lake Ziway sub-watersheds, Ethiopia

Desta, Hayal; Lemma, Brook

doi:10.1016/j.ejrh.2017.08.002

Cited by 48 publications

(27 citation statements)

References 63 publications

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“…The main inputs for the SWAT model include digital elevation model (DEM), land use/cover data, soil data, and weather data (temperature and precipitation). The SWAT model setup for the assessment of hydrological processes in the Central Rift Valley was described by Desta and Lemma [41]. The model setup begins with watershed delineation and generating streamflow networks from DEM data using ArcSWAT software in the ArcGIS interface.…”

Section: Swat Model Setup and Data Inputmentioning

confidence: 99%

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

et al. 2018

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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...

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Section: Swat Model Setup and Data Inputmentioning

confidence: 99%

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

et al. 2018

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“…The deviation between the simulated and observed levels beginning from the end of 2000 attributed to an error in any of the water balance terms and human activities such as pumping water abstraction for irrigation, which are not incorporated in our model simulation. We also refer to previous studies that indicated increased irrigation water abstraction during recent periods in the Central Rift Valley lakes basin [5], [26]. Additionally, future climate change projections such as increased air temperatures and decreased precipitation might also lead to decline in lake water levels as well as severe water scarcity problems.…”

Section: Lake Water Level Simulationmentioning

confidence: 96%

Impact of Water Abstraction on the Water Level of Lake Ziway, Ethiopia

Goshime

Absi

Ledésert

et al. 2019

WIT Transactions on Ecology and the Environment

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Significant change has been observed in the water level of Lake Ziway in Ethiopia which hinders its services for a wide variety of ecosystems. However, the contribution of water withdrawal and its impact on the lake water level variation has not been quantified yet. In this study, we conducted a water abstraction survey (WAS) to estimate actual water withdrawal from the lake. Then, we applied a water balance model coupling with simulated river inflow from rainfall-runoff model output data to evaluate the isolated impact of water withdrawal on the lake water level from 1986-2000 at monthly time steps. The amount of water withdrawal from the lake for irrigation water use is 37 10 6 m 3 per year. This led to 0.36 m drop in the lake level which corresponded to 18 km 2 reductions in the lake surface area. This consequently resulted in a reduction of mean annual lake volume by 162 10 6 m 3 from 1986-2000, which accounts for 23% of the total lake inflow from rivers.The results indicate that abstraction from the lake is a significant contributor to the drop in water level of Lake Ziway. This calls for serious action on the management of water abstraction from the lake.

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“…Frederick Ayivi and Manoj K Jha (2018) Estimated Water yield and water balance in Reedy Fork-Buffalo creek watershed in North Carolina, they also assessed the performance of SWAT for future prediction of water balance and water yield in other watersheds of North Carolina [5]. Hayal Desta and Brook lemma (2017) quantified and compared water balance components, discharge of feeder river and evapotranspiration in Lake ziway watershed, Ethiopia using SWAT model [6]. O.M.M.…”

Section: Literature Reviewmentioning

confidence: 99%

Estimation of Water Balance Components of Watersheds in the Manjira River Basin using SWAT Model and GIS

Mestry¹,

Narwade²,

Nagarajan³

2020

IJEAT

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This study mainly focus on hydrological behavior of watersheds in The Manjira River basin using soil and water assessment tool (SWAT) and Geographical information system (GIS). The water balance components for watersheds in the Manjira River were determined by using SWAT model and GIS. Determination of these water balance components helps to study direct and indirect factors affecting characteristics of selected watersheds. Manjira River contains total 28 watersheds among them 2 were selected having watershed code as MNJR008 and MNJR011 specified by the Central Ground Water Board. The SWAT input data such as Digital elevation model (DEM), land use and land cover (LU/LC), Soil classification, slope and weather data was collected. Using these inputs in SWAT the different water balancing components such as rainfall, baseflow, surface runoff, evapotranspiration (ET), potential evapotranspiration (PET) and water yield for each watershed were determined. The evaluated data is then validated by Regression analysis, in which two datasets were compared. Simulated rain data from SWAT simulation and observed rain data from Global Weather Data for SWAT was selected for comparison for each watershed.

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SWAT based hydrological assessment and characterization of Lake Ziway sub-watersheds, Ethiopia

Cited by 48 publications

References 63 publications

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

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

Impact of Water Abstraction on the Water Level of Lake Ziway, Ethiopia

Estimation of Water Balance Components of Watersheds in the Manjira River Basin using SWAT Model and GIS

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