title: Factors affecting the stable isotopes ratios in groundwater impacted by intense agricultural practices: A case study from the Nile Valley of Egypt.
abstract: The monitoring of stable isotopes (δ18O and δ2H) in water can provide a sensitive indicator of water loss by evaporation. We obtained water samples from surface water and groundwater from both the young and old alluvial plains in the central part of the Nile Valley of Egypt. Groundwater is the only source for irrigation in the old alluvial plains while both surface water (River Nile and irrigation canals) and groundwater are used in the young alluvial plain. Results showed different isotopic compositions between each group of samples and hydrologic connections between shallow groundwater and surface water in the young alluvial plain. The δ18O and δ2H relationship of the samples collected from the desert areas of the old alluvial plains below agricultural lands define an evaporation line with a slope of 4.5 and low deuterium excess of <-14‰. These values can be attributed to return flow of irrigation water that has been subjected to evaporative processes, further amplified by intense agricultural practices. Average evaporative losses were estimated to be between 31% and 36%.
authors: Western Michigan University, Department of Geosciences, Kalamazoo, MI 49008, USA; South Valley University, Department of Geology, Qena 83523, Egypt. Electronic address: abdelmawgoud.m.mohammed@wmich.edu.
authors: Abdel Mawgoud
authors: AM
authors: Mohammed
authors: Western Michigan University, Department of Geosciences, Kalamazoo, MI 49008, USA.
authors: R V
authors: RV
authors: Krishnamurthy
authors: Western Michigan University, Department of Geosciences, Kalamazoo, MI 49008, USA.
authors: Alan E
authors: AE
authors: Kehew
authors: University of New Mexico, Department of Earth and Planetary Sciences, Albuquerque, NM, USA.
authors: Laura J
authors: LJ
authors: Crossey
authors: University of New Mexico, Department of Earth and Planetary Sciences, Albuquerque, NM, USA.
authors: Karl K
authors: KK
authors: Karlstrom
keywords: Egypt; Evaporative loss; Nile Valley Aquifer System; Stable isotope; Water resources