Impacts of land use/land cover change on stream flow and sediment yield of Gojeb watershed, Omo-Gibe basin, Ethiopia

Choto, Misganaw; Fetene, Aramde

doi:10.1016/j.rsase.2019.01.003

Cited by 36 publications

(25 citation statements)

References 8 publications

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“…Other authors also found increases in surface runoff and decreases in ground water flow as a result of the conversion of forest to other land use, such as agricultural land [33], or pasture [6]. If current forest plantations are converted to pasture, an increase on stream-flow is to be expected (as stated by [34]), especially in rainy season, as reported by [33], [2], and [35]. Meanwhile, groundwater contribution to stream decreases, which might have an important impact in irrigated crop areas along the middle part of the sub-basin and the water flow in the dry season -which relies on groundwater flow.…”

Section: Reventado River Sub-basinmentioning

confidence: 90%

Remote sensing data for calibrating hydrologic modeling: Hydrological impacts of land use change of the Reventado river sub-basin, Costa Rica

Tapia-Arenas¹,

Feger²,

Jülich³

2020

RFMK

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The “Ecological rehabilitation pilot plan of the Irazú Volcano National Park – Prusia Sector” intends to determine an ecological rehabilitation plan for current 54-year unmanaged exotic forest plantation. This study aims to determine water balance impacts on land cover changes over the Reventado river sub-basin. Thus, three scenarios were considered: Current (current cover conditions), Pasture (exotic forest plantations converted to pasture) and Forest (exotic forest plantations to natural forest). No field data was available for calibration; therefore MODIS16A2 product was used to calibrate evapotranspiration from hydrologic modeling using SWAT. An analysis was performed to determine if estimates vary using two models: 1) parameterized but non-calibrated approach(PNCA), and 2) parameterized and calibrated approach (PCA). Overall, using MODIS16A2 for calibration was satisfactory, showing statistically significant differences in ET, PERC, SURQ and GWQ. The PCA was then used for estimating the impact on water balance variables due to land cover change scenarios –previously mentioned. Slightly differences between Current and Forest scenarios were perceived, whereas Pasture showed 5 % annual increment in surface runoff and 3 % annual decrement of ground water contribution to stream. Thus, careful wood extraction and rehabilitation planning is needed in order to assure low impacts in the hydrological behavior of the sub-basin.

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Section: Reventado River Sub-basinmentioning

confidence: 90%

Remote sensing data for calibrating hydrologic modeling: Hydrological impacts of land use change of the Reventado river sub-basin, Costa Rica

Tapia-Arenas¹,

Feger²,

Jülich³

2020

RFMK

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“…Consequently, sediment rating curve was used to generate sediment load data from the streamflow using the empirical relations between the sediment concentration and their corresponding streamflow. The use of estimates derived from empirical relations between sediment concentrations and the corresponding river discharge are used often when the long-term and reliable records of sediment concentrations are limited [25].…”

Section: Sediment Rating Curvementioning

confidence: 99%

The status of soil erosion in the Upper Blue Nile Basin: Identification of hot spot Areas and Evaluation of Best Management Practices in the Toba Watershed

Dibaba¹,

Ebsa²

2021

Preprint

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Land degradation caused by soil erosion has become the most serious problem in the Ethiopian highlands. Quantifying the spatial variations of soil loss with a strong evidence helps to prioritize the watersheds for the implementation of different management practices. The study was carried out in the Toba Watershed of the Upper Blue Nile Basin in Ethiopia. Its objective was to evaluate the rate of soil erosion and identify the hotspots with high risk of soil erosion for watershed management planning. Then, Soil and Water Assessment Tool (SWAT) was used to evaluate the effectiveness of best management practices (BMP) in reducing soil loss. The performance of SWAT in simulating streamflow and sediment yield was evaluated through sensitivity analysis, uncertainty, calibration and validation process. Statistically, the calibrated and validated sediment yields (SY) against the observed sediment data were reasonably accurate (R2 = 0.67, 0.65, NSE = 0.66, 0.64, PBIAS=-8.4%, 9.8% respectively). The annual SY in Toba watershed varies from 0.09 t ha− 1 yr− 1 to 44.8 t ha− 1 yr− 1 with an average SY of 22.7 t ha− 1 yr− 1. To prioritize the SY of the watershed, the annual severity of SY was divided into six classes: very low, low, moderate, high, very high and severe. The study also showed that SY in most watersheds (about 53.8%) were higher than the average. Cultivation on steep slopes leads to the highest SY, while forested areas have lower SY contribution. five management scenarios were evaluated using the Calibrated model. Seventeen sub-basins with SY exceeding the tolerable erosion of Ethiopia (t ha− 1 yr− 1) were considered for the analysis of the BMP scenario. The results show that reforestation combined with vegetative strips was the most effective for soil erosion control (87.8% reduction) followed by the combination of soil/stone bund and vegetative strips (83.7% reduction). Overall, the results of this study provided important data for watershed management and are very useful to ensure the sustainable management of land and natural resources at watershed level.

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“…The impacts of LULC change on streamflow have been widely studied for a range of different regions of the world using hydrological models [8][9][10]. Although there are a wide range of hydrological models available, the Soil and Water Assessment Tool (SWAT) is widely used for assessing the impact of land-use changes on water and sediment flows because it is a well-documented model, it is freely available, and has been shown to perform well through numerous validation studies [3,11,12]. As expected, most studies indicated that conversion from forest to agricultural area would generate more run-off and sediment, and that increasing urban areas can also result in greater run-off.…”

Section: Introductionmentioning

confidence: 99%

“…The impacts of individual land-use types on runoff and sediment yield at a sub-basin scale within Hun River basin in China were evaluated, and it was found that forest land decreased sediment yield over the year and increased water percolation, while urban land generally increased runoff and decreased sediments yield [11]. Similarly the impacts of rapid LULC change on streamflow and sediment yield of the Gojeb watershed, Ethiopia, were evaluated and it was concluded that conversion from forest to cultivated land increased streamflow and sediment yields [12]. In another study on the effect of LULC change on flow and sediment yield in the Khokana Outlet of the Bagmati River, Nepal, it was also concluded that the expansion of the urban area led to an significant increase in streamflow, whereas groundwater contribution to streamflow decreased due to decreasing urban infiltration [2].…”

Section: Introductionmentioning

confidence: 99%

A Framework to Assess the Reliability of a Multipurpose Reservoir under Uncertainty in Land Use

Nguyen

Cochrane

Pahlow

2021

Water

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Socioeconomic development in watersheds lead to land-use changes, which can alter water and sediment inflows into reservoirs, leading to uncertainty in water supply reliability. A modelling framework coupling the Soil and Water Assessments Tool (SWAT) and the @RISK genetic algorithm optimisation tool was developed to optimise water allocation and estimate water supply reliability under uncertainty in future land-use. The multi-purpose Nuicoc reservoir in Vietnam was used as a case study. Modelling results showed that an expansion of the urban areas by 10% and conversion of 5% of the forest to agricultural areas produced the highest water releases for downstream demands of all simulated scenarios, with 5 Mcm/year greater water releases than the baseline for the case where sedimentation was not considered. However, when sedimentation was considered, it generated the greatest decrease in water releases, with 6.25 Mcm/year less than the baseline. Additionally, it was determined that spatial distribution of land-use significantly affect sediment inflows into the reservoir, highlighting the importance of targeted sediment management. This demonstrates the usefulness of the proposed framework for decision-makers in assessing the impact of possible land-use changes on the reservoir operation.

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Impacts of land use/land cover change on stream flow and sediment yield of Gojeb watershed, Omo-Gibe basin, Ethiopia

Cited by 36 publications

References 8 publications

Remote sensing data for calibrating hydrologic modeling: Hydrological impacts of land use change of the Reventado river sub-basin, Costa Rica

Remote sensing data for calibrating hydrologic modeling: Hydrological impacts of land use change of the Reventado river sub-basin, Costa Rica

The status of soil erosion in the Upper Blue Nile Basin: Identification of hot spot Areas and Evaluation of Best Management Practices in the Toba Watershed

A Framework to Assess the Reliability of a Multipurpose Reservoir under Uncertainty in Land Use

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