Spatiotemporal lakes surface area changes over 35 years and potential causes in the Central Rift Valley, Ethiopia

Central Rift Valley (CRV) region, Ethiopia. The study aims to investigate the spatiotemporal change in lake water surface extents over 35 years (1986–2020) and identify potential causes. Three alternative multispectral water indices—Normalized Difference Water Index (NDWI), Automatic Water Extractio...

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Bibliographic Details
Published in:Journal of hydrology. Regional studies 2024-08, Vol.54, p.101863, Article 101863
Main Authors: Tola, Tolossa Lemma, Zhang, Ke, Chukalla, Abebe D., Liu, Linxin, Ezaz, Gazi Tawfiq, Elsadek, Elsayed Ahmed, Abdallah, Mohammed
Format: Article
Language:English
Subjects:
Central Rift Valley Lakes
Driving factors
Lake Abiyata
Lake surface area
Landsat image
Water extraction Indices
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Summary:Central Rift Valley (CRV) region, Ethiopia. The study aims to investigate the spatiotemporal change in lake water surface extents over 35 years (1986–2020) and identify potential causes. Three alternative multispectral water indices—Normalized Difference Water Index (NDWI), Automatic Water Extraction Index (AWEI), and Modified Normalized Difference Water Index (MNDWI)—derived from Landsat sensors (TM, ETM+, OLI) were utilized to extract and analyze the lake surface area. The Mann-Kendall correlation was applied to examine whether hydro-meteorological and anthropogenic variables are possible causes for changes. MNDWI outperforms other indices with over 96 % accuracy in mapping lake surface area. Lake Abiyata experienced the most significant reduction in surface area from 1986 to 2020 (>50 %), followed by Lake Ziway (
ISSN:2214-5818
2214-5818
DOI:10.1016/j.ejrh.2024.101863