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Agricultural drought assessment and monitoring using MODIS-based multiple indices: the case of North Wollo, Ethiopia

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Abstract

Agriculture is the most sensitive sector which has largely been affected by the impacts of drought. The study aims to detect and characterize agricultural droughts using MODIS-based multiple indices in North Wollo, Ethiopia. Two Moderate Resolution Imaging Spectroradiometer (MODIS) datasets (MOD13Q1 and MOD11A2) for the period 2000 to 2019 were used to generate Normalized Difference Vegetation Index (NDVI) and Land Surface Temperature (LST). Accordingly, NDVI anomaly, Vegetation Condition Index (VCI), Temperature Condition Index (TCI), and Vegetation Health Index (VHI) were computed to characterize agricultural droughts during the crop growing season. Both the NDVI anomaly and VCI confirmed that there was no single drought-free year in the area throughout the study period. TCI showed relatively exaggerated drought stress than the other indices. However, VHI indicated lower area coverage and a lower level of stress than its aggregates (VCI and TCI). Specifically, 2002, 2004, 2009, 2010, and 2015 were all identified as severe drought years, where over 60% of the area was affected by droughts. Results of the regression analysis indicated that VCI, TCI, and VHI were having significant positive trends with precipitation in the majority of the districts. Using the aggregated drought frequency of each index, 13.5, 73.7, and 12.8% of the area were under moderate, high, and extremely high levels of agricultural drought occurrence, respectively, and the likelihood of implied risks. Therefore, all the districts of North Wollo were affected by persistent drought stress. Such drought recurrences have the potential to impose significant impacts on the agro-based livelihoods of the local community demanding ongoing drought monitoring and the application of effective early warning systems.

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Data availability

The datasets used during the current study are freely available on websites listed in the acknowledgment.

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Acknowledgements

We would like to thank the USGS earth explorer for freely downloading different MODIS images of the study watershed from http://earthexplorer.usgs.gov. We also acknowledge the US Geological Survey (USGS) and the Climate Hazards Group at the University of California for developing the CHIRPS rainfall estimate and allowing us to freely download it at https://data.chc.ucsb.edu/products/CHIRPS-2.0/africa_monthly/. We are grateful to the Ethiopian National Meteorological Service Agency for providing the time series daily rainfall and temperature data of the study area.

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  1. Department of Geography and Environmental Studies, Bahir Dar University, P.O. Box 79, Bahir Dar, Ethiopia

    Simachew Bantigegn Wassie, Daniel Ayalew Mengistu & Arega Bazezew Birlie

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The first author collect data, analyzes it, and wrote the manuscript. The co-authors gave technical support and conceptual advice with comments for improvement. All authors discussed the contents, methods, and results of the manuscript. They also read, edited, and approved it.

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Wassie, S.B., Mengistu, D.A. & Birlie, A.B. Agricultural drought assessment and monitoring using MODIS-based multiple indices: the case of North Wollo, Ethiopia. Environ Monit Assess 194, 787 (2022). https://doi.org/10.1007/s10661-022-10455-4

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