Detection And Mapping Of Daya Features In The Limestone Plateau Of Northwest Egypt
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doi.org/10.1177/03091333261480… <-- shared paper
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doi.org/10.1007/s41207-024-004… <-- shared paper
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H/T @wael Galal | Geologist at Geology Department, Assiut University
“[The author’s] study systematically investigates ‘DAYAS’ shallow, ephemeral wetlands scattered across the limestone plateau of Northwest Egypt. Previously undocumented in Egyptian territory, these saucer-shaped depressions play a vital role in regional hydrology and karst evolution.
Through an integrated approach combining Sentinel-2 satellite imagery, multi-decadal Landsat time-series analysis (1984-2025), ALOS PALSAR DEMs, and extensive field validation, [they] identified and... show moreDetection And Mapping Of Daya Features In The Limestone Plateau Of Northwest Egypt
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doi.org/10.1177/03091333261480… <-- shared paper
--
doi.org/10.1007/s41207-024-004… <-- shared paper
--
H/T
@wael Galal | Geologist at Geology Department, Assiut University
“[The author’s] study systematically investigates ‘DAYAS’ shallow, ephemeral wetlands scattered across the limestone plateau of Northwest Egypt. Previously undocumented in Egyptian territory, these saucer-shaped depressions play a vital role in regional hydrology and karst evolution.
Through an integrated approach combining Sentinel-2 satellite imagery, multi-decadal Landsat time-series analysis (1984-2025), ALOS PALSAR DEMs, and extensive field validation, [they] identified and mapped 5,430 daya features covering 258.1 km² achieving 91% classification accuracy.
[Their] research established a typological framework distinguishing bowl-shaped, small flat-bottom, and large flat-bottom dayas representing a continuum from active karst dissolution to relict, sediment-sealed systems. Critically, [they] documented a 32.63% net increase in daya surface area over 41 years, demonstrating that karst modification remains an active geomorphic process even under present-day hyper-arid conditions.
This work provides government agencies and water resource planners with the first high-resolution spatial inventory of these features essential baseline data for sustainable groundwater management, water-harvesting infrastructure, and conservation prioritisation in this water-scarce region…”
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Research #
KarstGeomorphology #
RemoteSensing #
GIS #
spatial #
mapping #
spatialanalysis #
spatiotemporal #
WaterResources #
Egypt #
Dayas #
Sustainability #
PhysicalGeography #
water #
hydrology #
hydrography #
wetland #
daya #
geology #
limestone #
karst #
sentinel #
Landsat #
hydrogeomorphology #
geomorphology #
geomorphometry #
arid #
hyperarid #
planning #
policy #
sustainable #
groundwater #
conservation