Evaluation the ecological impacts due to unique torrent phenomenon on aquatic ecosystem (river Nile, Cairo, Egypt)
2003
El-lil, A.H.A. (Cairo Univ. (Egypt). Faculty of Science)
From 10-13 Oct. 1994, east bank of River Nile (east desert) at Assiut Governorate, Upper Egypt was subjected to huge amounts of rainfall in few days equal to those fall in one year or more. This unique ecological phenomenon leading to propelling the fine sand, silt and clay from surrounded dunes around the river Nile into its main branch. These particles were carried downward till reach Nile at Cairo and consequently lead to unfavorable changes in water colour from olive green into dark yellow and brownish colour. Water transparence altered negatively and off- course affected other physical parameters like DO2, redox pot., T.S.S., pH and caused considerable change in anions and cations contents, in addition to dramatic decrease of phytoplankton flora in water. The author be aware to study this unique phenomenon which did not happen for many decades and evaluate the alteration happen due to this phenomenon from physical, chemical and biotic view points, also comparing with features before the torrent period and recovering time needed to remove the impacted features.
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