Assessing the dynamics of El-Rayan lakes, Egypt, using remote sensing techniques

Mohamed E. Hereher*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The present study provided an integrated scheme of utilizing digital elevation models (DEMs) along with five Landsat satellite images between 1973 and 2013 in order to delineate the extent and capacity of El-Rayan depression, Egypt, and to highlight temporal changes which occurred upon the two anthropogenic lakes formed from the discharge of agricultural drainage wastewater within the depression. The capacity of the valley as well as water volume was estimated from DEM data, and water surface area was estimated by applying mathematical indices compiled from spectral bands in satellite data. The modified normalized difference water index (MNDWI) was the algorithm operated in this study. Results showed that the area of the depression at the sea level approaches about 352 km2, and the depression can store as much water as 6.45 billion m3. Water body of the two lakes has experienced reduction by seepage, evaporation, and shrinking to about 86 km2 in July 2013. Most shrinking was encountered at the lower lake due to drifting sand and local cultivation.

Original languageEnglish
Pages (from-to)1931-1938
Number of pages8
JournalArabian Journal of Geosciences
Issue number4
Publication statusPublished - Apr 9 2015
Externally publishedYes


  • El-Rayan depression
  • Landsat
  • Remote sensing
  • SRTM

ASJC Scopus subject areas

  • General Environmental Science
  • General Earth and Planetary Sciences


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