Modelling and accessing land degradation vulnerability using remote sensing techniques and the analytical hierarchy process approach

Geocarto International, Journal Year: 2021, Volume and Issue: 37(24), P. 7122 - 7142

Published: July 22, 2021

Land degradation and desertification have recently become a critical problem in Ethiopia. Accordingly, identification of land vulnerable zonation mapping was conducted Wabe Shebele River Basin, Precipitation derived from Global Measurement Mission (GMP), the Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized difference vegetation index (NDVI) surface temperature (LST), topography (slope), pedological properties (i.e., soil depth, pH, texture, drainage) were used current study. NDVI has been considered as most significant parameter followed by slope, precipitation temperature. Geospatial techniques Analytical Hierarchy Process (AHP) approach to model index. Validation results with google earth image shows applicability The result is classified into very highly (17.06%), (15.01%), moderately (32.72%), slightly (16.40%), (18.81%) degradation. Due small rate which evaporation high region, downstream section basis categorized Degradation (LD) vice versa upstream basin. Moreover, validation using Receiver Operating Characteristic (ROC) curve analysis an area under ROC value 80.92% approves prediction accuracy AHP method assessing modelling LD vulnerability zone study area. provides substantial understanding effect on sustainable use management development

Language: Английский

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Multiple Indices Based Agricultural Drought Assessment in the Rift Valley Region of Ethiopia

Environmental Challenges, Journal Year: 2022, Volume and Issue: 7, P. 100488 - 100488

Published: Feb. 18, 2022

Climate extreme like drought significantly affect the quality of environment and threaten food availability in developing countries Ethiopia. In this study, satellite-based agricultural assessments were conducted 0main crop growing season (June to September) using Landsat 8 images five periods (2015 2019) Rift Valley Region To assess we used Normalized Difference Vegetation Index (NDVI), Land Surface Temperature (LST), Condition (VCI), (TCI), Health (VHI). The results indicate that main was experienced by wet which vary from extremely dry wet. value VHI, cumulative effects TCI VCI, revealed 2016 most drought-prone while 2019 wettest year. Results NDVI LST showed a negative correlation. more severe lowland areas than highland study area. Accordingly, high observed northern central parts It is obvious face precipitation deficit because temperature evapotranspiration. This suggests indices crucial provide early warning systems for farming communities suggest adaptation options minimize potential impacts droughts on people's livelihoods wellbeing. Moreover, further research should be incorporating other social biophysical factors enhance understanding its effect economy communities.

Language: Английский

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Climate Change Impacts on Blue and Green Water of Meki River Sub-Basin

Water Resources Management, Journal Year: 2023, Volume and Issue: 37(6-7), P. 2835 - 2851

Published: April 15, 2023

Language: Английский

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Rainfall trends and spatiotemporal patterns of meteorological drought in Menna watershed, northwestern Ethiopia

Heliyon, Journal Year: 2024, Volume and Issue: 10(6), P. e27919 - e27919

Published: March 1, 2024

Understanding the spatiotemporal patterns of drought is crucial for planning, disaster preparedness, vulnerability assessment, impact evaluation, and policy formulation to mitigate drought-induced effects. The purpose this study was assess rainfall trends meteorological using geospatial techniques in Menna watershed. Climate Hazards Group InfraRed Precipitation with Stations (CHIRPS) rainfall, station-based observed were datasets used. used confirm accuracy CHIRPS data. Mann-Kendall (MK) test Sen's slope estimator utilized ascertain extent change. To characterize droughts, percent normal (PN), standardized anomaly index (SAI), precipitation (SPI) computed during crop growing seasons (2000-2022). validation result confirmed a strong agreement between data (R2 = 0.88). Based on MK test, an increasing trend has been annual (3.7 mm/year)

Language: Английский

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Mapping the spatial and temporal variation of agricultural and meteorological drought using geospatial techniques, Ethiopia

ENVIRONMENTAL SYSTEMS RESEARCH, Journal Year: 2021, Volume and Issue: 10(1)

Published: Feb. 9, 2021

Abstract Background Geographic Information System (GIS) and Remote Sensing play an important role for near real time monitoring of drought condition over large areas. The aim this study was to assess spatial temporal variation agricultural meteorological using image eMODIS NDVI based vegetation index (VCI) standard precipitation (SPI) from the year 2000 2016. To validate strength indices correlation analysis made between VCI crop yield anomaly as well standardized anomaly. Results results revealed that 2009 2015 years while 2001 2007 were wet years. There also a good rainfall (r = 0.71), (0.72), SPI (0.74). Frequency metrological compiled by historical intensity map. result shows there complex local scale in frequency events period. no without many parts area. Combined risk map showed 8%, 56% 35% area vulnerable very severe, severe moderate respectively. Conclusions In conclusion, is highly drought. Thus besides mapping areas, integrating socio-economic data better understand other factors recommended.

Language: Английский

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Impact of Climate Change on Hydrometeorology and Droughts in the Bilate Watershed, Ethiopia

Water, Journal Year: 2022, Volume and Issue: 14(5), P. 729 - 729

Published: Feb. 24, 2022

This study aims to assess the potential impacts of climate change on hydrometeorological variables and drought characteristics in Ethiopian Bilate watershed. Climate projections under two Representative Concentration Pathways (RCP4.5 RCP8.5) were obtained from Coordinated Regional Downscaling Experiment (CORDEX) Africa for near future (2021–2050) far (2071–2100) periods. The Soil Water Assessment Tool (SWAT) model was applied changes watershed hydrology with CORDEX-Africa data. Standardized Precipitation Index (SPI), Streamflow Drought (SDI), Reconnaissance (RDI) calculated identify meteorological, hydrological, agricultural droughts, respectively. Due a significant rise temperature, evapotranspiration will increase by up 16.8% end 21st century. Under RCP8.5 scenario, annual average rainfall is estimated decrease 38.3% period, inducing reduction streamflow 37.5%. Projections reduced diurnal temperature range might benefit crop growth but suggest elevated heat stress. Probabilities occurrence are expected be doubled increased intensities all three types droughts. These projected exacerbate water scarcity threaten food securities area. findings provide forward-looking quantitative information management authorities decision-makers develop adaptive measures cope changing climate.

Language: Английский

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Spatiotemporal variability and trend of rainfall and temperature in Sidama Regional State, Ethiopia

Theoretical and Applied Climatology, Journal Year: 2023, Volume and Issue: 153(1-2), P. 213 - 226

Published: April 27, 2023

Abstract This study aims to investigate spatiotemporal variability, trends, and anomaly in rainfall temperature the Sidama region, Ethiopia. The TerraClimate gridded dataset on a monthly time scale for 30 years (1991–2020) with horizontal resolution of approximately 4 km was used study. Trends annual seasonal were assessed using nonparametric test (Mann-Kendal test) Sen’s slope statistical significance magnitude trends (increase/decrease), respectively. Our findings revealed that rainfall, summer ( Hawado ), spring Badhessa ) have shown an increasing trend most parts except its northwest parts. We found low variability (CV < 13%) over southeastern northwestern region. Rainfall difference both space across Six drought (1999, 2001, 2002, 2003, 2012, 2019) different magnitudes identified Annual average maximum (up 0.4 °C decade −1 minimum 0.25 temperatures significantly standardized mean indicated recent (2011–2020) are getting warmer compared past two decades (1991–2010) due natural anthropogenic activities causing weather extremes results this contradict other studies rift valley part Therefore, we suggest appropriate climate change adaptation strategies so there is high region between seasons.

Language: Английский

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Monitoring spatio-temporal drought dynamics using multiple indices in the dry land of the upper Tekeze Basin, Ethiopia

Environmental Challenges, Journal Year: 2023, Volume and Issue: 13, P. 100781 - 100781

Published: Oct. 18, 2023

Due to Ethiopia's broad variations in biophysical and climatic variables, an accurate understanding of local-level drought is critical for sustainable risk management. This study aims monitor spatio-temporal dynamics over Tekeze basin from 1981–2021 using Standard Precipitation Index (SPI), Vegetation Condition (VCI), Temperature (TCI), health Index(VHI). The analysis relied on data Moderate Resolution Imaging Spectroradiometer (MODIS) datasets CHIRPS-v2. Google Earth Engine (GEE) was used obtain data, process NDVI trends, calculate indices (DI). Man-Kendall trend Pearson correlation were also employed examine the association DI climate variables. SPI showed that affected by moderate, severe, extreme 1884, 1985, 1987, 1993, 1997, 2015. TCI and, VCI, indicated 2002, 2004, 2009, 2015, 2016, 2017 severe droughts. a decreasing throughout most basin, except pocket areas managed watershed, area closures, irrigation sites. Rainfall July emerged as factor determining NDVI, LST, TCI, VCI August. While strongly correlates with precipitation LST less correlated. Although all DIs are robust assessing agricultural droughts, detected more land under than TCI. underscores importance larger weights correctly classifying drought, particularly drylands where crucial vegetation health.

Language: Английский

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Analysis of rainfall and temperature variabilities in Sidama regional state, Ethiopia

Heliyon, Journal Year: 2024, Volume and Issue: 10(7), P. e28184 - e28184

Published: March 26, 2024

The objective of the study was to examine local-scale fluctuation in precipitation and temperature selected districts Sidama regional state. Specifically, it focuses on three districts—Hawassa Zuriya, Wonsho, Hula—using records obtained from Climate Hazards Group Infrared Precipitation with Station (CHIRPS) database which covers period 1981 2022. Various statistical measures such as mean, standard deviation, well coefficient variation employed detect fluctuation. For trend detection, Mann-Kendall (MK) Sen's slope tests were also employed. Observations revealed that average yearly spatially varied 1331 mm Hula, followed by 1275 1013 at Hawassa Zuriya. Rainfall bimodal 53% rains Kiremt 33% Belg season respectively. Annual rainfall show relatively low variability (<20%) for Hula Wonsho districts, moderate (CV˃20%) Zuriya findings noticeable rising tendencies (p < 0.05) across all agroecosystems over years under consideration highest (0.038 °C/year), (0.031 (0.022 °C/year) respectively.Moreover, both exhibited spatial inter-annual variability. results this necessitate farmers systematic planning implementing location specific crop calendar context fluctuating climatic settings. Policy-makers development practitioners can utilize finding better devise execute plans adapting minimizing effects climate change.

Language: Английский

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Analysis of rain-shadows in the Ethiopian Mountains using climatological model data

Climate Dynamics, Journal Year: 2021, Volume and Issue: 56(5-6), P. 1663 - 1679

Published: Jan. 3, 2021

Language: Английский

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