Impacts of Climate and Land Use Change on Hydrological Response in Gumara Watershed, Ethiopia

Teklay, Achenafi; Dile, Yihun T.; Asfaw, Dereje H.; Bayabil, Haimanote K.; Sisay, Kibruyesfa

doi:10.1016/j.ecohyd.2020.12.001

Cited by 38 publications

(22 citation statements)

References 62 publications

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“…Other studies have discussed the impacts of LULC and climate changes on catchment hydrologic processes at different places (Li et al 2009;Zuo et al 2016;Bessah et al 2020). Studies in Blue Nile Basin, Ethiopia indicated that water resources are vulnerable to both LULC and climate changes (Woldesenbet et al 2018;Gebresilassie et al 2020;Tigabu et al 2020;Getachew et al 2021;Negesse 2021;Teklay et al 2021). Besides, a study at the Rift Valley Basin, Ethiopia showed that the combined effect of LULC and climate changes significantly decreases streamflow by 11.8% and increases evapotranspiration by 2.2% at Meki River Basin (Legesse et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Hydrologic responses to climate and land-use/land-cover changes in the Bilate catchment, Southern Ethiopia

Kuma

Fufa

Demissie

2021

Journal of Water and Climate Change

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The likely effects of climate and land-use/land-cover (LULC) changes on hydrologic processes in Bilate catchment, Ethiopia were evaluated. The study emphasizes the evaluation of individual and combined impacts on hydrologic responses of climate and LULC changes. Climatic scenarios included a downscaled regional climate model from CORDEX-Africa. The CA–Markov model was used to project LULC. The results revealed that distinct changes on hydrologic responses occurred which follow the direction of climate and LULC changes. A 30.87% decline in rainfall resulted in about 4.09, 1.43 and 3.57% decline in runoff, groundwater and water yield, respectively. A rise in mean temperature by 1.3 °C resulted in 7 and 0.8% increase in potential and actual evapotranspiration, respectively. Runoff, groundwater and water yield are projected to decrease by 11.24, 12.54 and 11.54%; however, potential and actual evapotranspiration are projected to increase by 19 and 14.7%, respectively, under combined climate and LULC changes. The joint effects of climate and LULC changes on hydrologic responses in the forthcoming were higher than the variation trend of climate or LULC change alone. Climate change compared with LULC change has a higher impact on hydrologic responses. The results obtained provide further insight into future water balance, assistance in water resources planning and management.

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Section: Introductionmentioning

confidence: 99%

Hydrologic responses to climate and land-use/land-cover changes in the Bilate catchment, Southern Ethiopia

Kuma

Fufa

Demissie

2021

Journal of Water and Climate Change

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“…A quantitative investigation explores the effect of two land uses: Pasture and natural forest on the water resource management of a tropical catchment. Hypothetical simulation of land use scenarios have attracted interest [2,[6][7][8][9][10][11] and investigations of the hydrological regime on climate change and urbanization scenarios based on the coupling of a stochastic weather generator with a land use change model in a basin-scale; water balance components will show the main changes of the scenarios evaluated [13,[15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…The farmers in these units must be conscious that the water requirements of the growing population are essential and it is necessary to acquire parcels of the terrain in the upper lands where preservation of vegetation is imperative [17,28]. Therefore, threatened springs, streams, and rivers should be identified and protected so that the population and agriculture can have enough water of better quality.…”

Section: Introductionmentioning

confidence: 99%

Potential Impacts of Land Use Changes on Water Resources in a Tropical Headwater Catchment

Martins

Valera

Zanata

et al. 2021

Water

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The main objective of this study was to investigate the relationships between land use and future scenarios of land changes on water runoff and groundwater storage in an Environmental Protection Area (EPAs) watershed. The methodology was based on the application of the Soil and Water Assessment Tool (SWAT) hydrological modelling to investigate flow simulations in current land use and in two future scenarios (forest and pasture). The performance of goodness-of-fit indicators in the calibration (NSE = 0.82, R2 = 0.85, PBIAS = 11.9% and RSR = 0.42) and validation (NSE = 0.70, R2 = 0.72, PBIAS = −4% and RSR = 0.55) was classified as good and very good, respectively. The model accurately reproduced the inter-annual distribution of rainfall. The spatial distribution of average annual surface flow, lateral flow, and groundwater flow were different between sub-basins. The future scenario on land use change to forest (FRSE) and pasture (PAST) differed during the year, with greater changes on rainy and dry seasons. FRSE increase of 64.5% in area led to decreased surface runoff, total runoff, and soil water; and increased lateral flow, groundwater, and evapotranspiration. The effect of the natural vegetation cover on soil moisture content is still unclear. The hydrological model indicated the main areas of optimal spatial water flow. Considering economic values, those areas should encourage the development of government policies based on incentive platforms that can improve environmental soil and water sustainability by establishing payment for environmental services (PES).

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“…Also, Karlsson et al (2016) noted that land use changes only affect the total flow ratios to a minor degree (a few percentages of mean flow) in SWAT model. In the study of Teklay et al (2020), expansion of agriculture lands caused only increases up to 3 mm in streamflow, while the surface runoff change was over 5%. Another study by Wang, Xu, et al (2018) showed that urbanization had a more dominant effect on surface runoff (12% increase) than water yield (1% increase).…”

Section: Resultsmentioning

confidence: 94%

“…The results of the study by Lotz et al (2018) using SWAT model showed that surface runoff and ET are mainly determined by land cover changes under same rainfall conditions and an increase in forest area led to a decrease in water yield. In another study conducted with SWAT model, Teklay et al (2020) reported that surface runoff had remarkable effects under expansion of agricultural lands and expansion of forest covers, whereas total water yield changes were relatively small.…”

Section: Introductionmentioning

confidence: 99%

Effect of land use change on hydrology of forested watersheds

Dogan

Karpuzcu

2021

Ecohydrology

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Land use/cover changes (LUCCs) in megacities can be rapid and extensive and lead to unintended consequences in sustainable watershed management. The aim of this study was to investigate effects of LUCC on hydrological components using Soil & Water Assessment Tool (SWAT) model in Terkos Basin, Turkey. Four LUCC scenarios (deforestation, urbanization, decrease in agricultural land and expansion in agricultural land) were set up regarding possible future land use changes in the watershed. Surface runoff was the main hydrological component that was impacted by LUCCs. Urbanization and conversion into agricultural lands scenarios resulted in considerable increases in surface runoff. Annual change of surface runoff for urbanization and conversion into agricultural lands scenarios was over 45% when compared to the baseline scenario. More remarkable changes were seen in dry months among the scenarios. Controlling the overall response of the hydrological systems to LUCC depends on better understanding of surface runoff processes. LUCC scenarios were also assessed based on freshwater availability components blue water and green water. The average annual total blue water potential, annual total green water flow and average green water storage of studied sub‐basin were 537, 584 and 108 mm/year for the baseline scenario, respectively. The trends of the blue water flow and green water storage were similar for each scenario, in that they were closely related to precipitation. This study provides valuable insight into hydrological impacts of possible land use changes on forested watersheds.

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Impacts of Climate and Land Use Change on Hydrological Response in Gumara Watershed, Ethiopia

Cited by 38 publications

References 62 publications

Hydrologic responses to climate and land-use/land-cover changes in the Bilate catchment, Southern Ethiopia

Hydrologic responses to climate and land-use/land-cover changes in the Bilate catchment, Southern Ethiopia

Potential Impacts of Land Use Changes on Water Resources in a Tropical Headwater Catchment

Effect of land use change on hydrology of forested watersheds

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