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Assessment of land use/land cover change impact on streamflow: a case study over upper Guder Catchment, Ethiopia

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Abstract

The dynamic nature of land use/land cover modifies the basin’s hydrology and, therefore, evaluation of its impact on hydrological elements is of great importance. This research aims to quantify the impact of land use/land cover change on the streamflow of Upper Guder River Catchment, Ethiopia. In this study, a semi-distributed Soil Water Assessment Tool (SWAT) model was used to see the static impact of LU/LC change on streamflow for 30 years (1989–2018). Landsat images were classified using a maximum likelihood classifier to generate LU/LC maps for the years 1989, 2002, and 2018. The LU/LC results show that, during the study period, forest/shrubland and grassland decreased by 6.48% and 4.23%, respectively, while Agricultural and Built-up areas increased by 8.04% and 2.69%, respectively. In this study, the SWAT model was calibrated for ten years (1995–2004) and then validated for five years (2005–2009) using daily discharge and LU/LC for the year 2002. During calibration, the R2 and NSE were 0.84 and 0.74, while during validation 0.83 and 0.72, respectively. The calibrated and validated model parameters then were transferred to run the SWAT model with LU/LC data from 1989, and 2018. The simulated results show that due to modified LU/LC streamflow has increased in the wet season and short rainy season by 10.04% and 5.25%, respectively, while it has decreased by 6.60% in the dry season. The decrease in the streamflow during the dry season is mainly due to changing LU/LC, which has brought an alarming situation at downstream sites. Thus, to cope-up with it an effective integrated participatory approach for catchment management is required in the basin and surrounding neighborhood.

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Data availability

The datasets generated during and/or analysed during the current study are not publicly available due to [REASON(S) WHY DATA ARE NOT PUBLIC] but are available from the corresponding author on reasonable request.

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Acknowledgements

The authors would like to acknowledge the Ministry of Education for sponsoring the first author to carry out this research during his master’s dissertation. In addition, we want to acknowledge the Ministry of Water, Irrigation, and Energy (MOWIE) and the Ethiopian Meteorological Service Agency for providing essential hydrological and meteorological inputs.

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Correspondence to Takele Dufera Tasgara.

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Tasgara, T.D., Kumar, B. Assessment of land use/land cover change impact on streamflow: a case study over upper Guder Catchment, Ethiopia. Sustain. Water Resour. Manag. 9, 6 (2023). https://doi.org/10.1007/s40899-022-00783-1

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  • DOI: https://doi.org/10.1007/s40899-022-00783-1

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