Land cover change and its implication to hydrological regimes and soil erosion in Awash River basin, Ethiopia: a systematic review

Tola, Sintayehu Yadete; Shetty, Amba

doi:10.1007/s10661-021-09599-6

Cited by 19 publications

(13 citation statements)

References 80 publications

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“…The Awash River is an important source of fluvial sediment to the Rift Valley. It is the second longest river in Ethiopia with a catchment area about 110,000 km 2 (Tola & Shetty, 2021). It transports material from the Ethiopian Highlands where it originates, through the Rift Valley to the lowland plain of the Afar Depression where it terminates in Abe Lake (Billi, 2015).…”

Section: Resultsmentioning

confidence: 99%

Dust Source Activation Frequency in the Horn of Africa

Kunkelova,

Crocker,

Wilson

et al. 2024

JGR Atmospheres

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Mineral dust aerosols play an important role in Earth's climate through interactions with incoming solar radiation, clouds, and the atmosphere. However, dust sources in the Horn of Africa (HoA) and controls on their activation are poorly documented. Here, we use fifteen‐minute Meteosat Second Generation Spinning Enhanced Visible and Infrared Imager dust index images to identify HoA dust source areas and to quantify their activation frequency in 1° × 1° resolution from 2006 to 2010. Around half of all recorded dust events occur in boreal summer, mostly between 8:00 and 16:00 local time. They are driven by meso‐ to regional scale meteorological mechanisms including the breakdown of the nocturnal low‐level jets, land‐sea breezes, and haboobs. By far the most dust‐active region in the HoA is the Afar Triangle (>77% of all recorded dust events) which features the Afar and Danakil depressions and is fed by the Awash River. Despite experiencing strong and persistent southwest summer monsoon winds, dust activation on the Somali Peninsula is less significant. A composite of our map with data for North Africa and westernmost Asia shows that the HoA is a striking latitudinal anomaly with dust activation extending deep into the equatorial belt. Our data also reveal that dust activation is unusually seasonal with ∼40% of events occurring in June and July. Our findings show that aridity and mean wind strength alone are poor predictors of dust activation and underscore the strong control exerted by the availability of readily deflated unconsolidated riverine and lacustrine sediments.

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Section: Resultsmentioning

confidence: 99%

Dust Source Activation Frequency in the Horn of Africa

Kunkelova,

Crocker,

Wilson

et al. 2024

JGR Atmospheres

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“…Elevation, drainage density, slope, and rainfall were classifed in accordance to get a uniform interval in between classes (Table 1). Similar research studies also applied uniform intervals to categorize classes for diferent factors [41][42][43][44]. Te land use type of the basin was condensed into fve classes such as forest, woodland, grass land, cultivated land, and water body where their level of infuences for food occurrence varies from very low, low, moderate, and high to very high, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Recent history has shown that the basin is highly afected by recurrent foods as well as erosion [22,[39][40][41][42]. Increasing agricultural activities without land conservation and overgrazing leads to erosion and further aggravates fooding.…”

Section: Study Areamentioning

confidence: 99%

“…Flood hazard zoning is developed for UARB using the analytical hierarchy process (AHP) and further elaborated using the applying sensitivity analysis method. Te AHP method uses a multicriteria analysis approach, which was developed by Saaty in the 1970s [27,28], and has been extensively used ever since [41][42][43][44][47][48][49][50][51][52]. Tis allows for selecting potential parameters that cause fooding.…”

Section: Analytical Hierarchy Process (Ahp)mentioning

confidence: 99%

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Flood Hazard Zoning of Upper Awash River Basin, Ethiopia, Using the Analytical Hierarchy Process (AHP) as Compared to Sensitivity Analysis

Mekonnen¹,

Mitiku²,

Woldemichael³

2023

The Scientific World Journal

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Floods and droughts have been two of the most devastating consequences of the climate crisis affecting billions of people in the world. However, unlike the other natural hazards, flooding is manageable through appropriate flood management mechanisms. This study emphasizes on developing a flood hazard zone for the Upper Awash River Basin (UARB), Ethiopia. Six relevant climate, physiographic, and biophysical factors were considered. Then, a flood hazard map was developed employing the analytic hierarchy process (AHP) method and further validated using sensitivity analysis and collected flood marks. The results revealed that drainage density, rainfall, and elevation have higher significance, while land use and soil permeability have a low impact in the process of flood generation. The map showed vulnerable areas at different levels and can serve as a valuable input for the decision makers to consider in the process of implementing emergency plans as well as long-term flood mitigation options.

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“…The degradation of human-environment systems is seriously triggered by anthropogenic-related drivers, resulting in changes in landscape patterns [1]. The landscape functions have also been negatively affected by inappropriate remediation, industrialization, and urbanization activities, which have changed the hydrological cycle components, including waterways [1,2].…”

Section: Introductionmentioning

confidence: 99%

Quantifying Landscape Pattern–Hydrological Process Linkage in Northwest Iran

Rasoulzadeh,

Mostafazadeh,

Mobaser

et al. 2023

Atmosphere

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The enormous heterogeneity and complexity of landscape patterns and their linkage with the hydrological responses have rarely been quantified and cataloged, especially in ungauged regions. This research therefore linked the landscape characteristics to hydrological processes using a newly developed runoff landscape index (RLI) at the watershed scale in Ardabil Province, northwest Iran. First, 11 common landscape metrics were calculated using Fragstats 4.2.1 software. Then, a runoff landscape index (RLI) was developed based on land cover (λC), soil (λK), and topography (λS) factors in 28 watersheds. Correlation and regression analyses were also conducted to determine the relationship between RLI, commonly used landscape metrics, and mean base flow. The spatial variations of all meaningful landscape metrics and RLI were considerable throughout the study watersheds. The mean values of λC, λK, and λS were found to be 2.78 ± 1.08, 0.50 ± 0.10, and 1.22 ± 0.30, respectively. The mean RLI varied from 0.00009 in the Lay Watershed with an area of 19.09 km2 to 0.28 in the Boran Watershed with 10,268.95 km2. The correlation coefficient (r > 0.42; p-value < 0.05) was obtained significantly between RLI and only five landscape metrics, including the largest patch index (LPI), landscape shape index (LSI), landscape division index (DIVISION), splitting index (SPLIT), and Shannon’s diversity index (SHDI). In addition, a regression model with R2 of 0.97 and 0.67, respectively, in calibration and validation steps was established between river base flow as the dependent variable and main waterway length, LPI, LSI, SPLIT, modified Simpson’s diversity index (MSIDI), and λS as independent variables. The result confirms the significant interdependence of RLI and landscape characteristics, which can be used to interpret the landscape’s dynamic and its effects on hydrological processes.

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Land cover change and its implication to hydrological regimes and soil erosion in Awash River basin, Ethiopia: a systematic review

Cited by 19 publications

References 80 publications

Dust Source Activation Frequency in the Horn of Africa

Dust Source Activation Frequency in the Horn of Africa

Flood Hazard Zoning of Upper Awash River Basin, Ethiopia, Using the Analytical Hierarchy Process (AHP) as Compared to Sensitivity Analysis

Quantifying Landscape Pattern–Hydrological Process Linkage in Northwest Iran

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