Author(s)

Nahlah Abbas¹, Nadhir Al-Ansari^2*, Saleh Wasimi¹, Abdulla M. Al-Rawabdeh³

¹School of Engineering & Technology, Central Queensland University, Melbourne, Australia.
²Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå, Sweden.
³Department of Earth and Environmental Science, Yarmouk University, Irbid, Jordan.

Iraq relies greatly on the flow of the Euphrates and Tigris Rivers and their tributaries. Five tributaries namely Khabour, Greater Zab, Lesser Zab, AlAdhiam and Daylia, which are the major tributaries of Tigris River, sustain Northern Iraq Region, a semi-arid, mainly a pastureland. These tributaries contribute about 24 km³ of water annually. The discharge in the tributaries, in recent times, has been suffering increasing variability contributing to more severe droughts and floods apparently due to climate change. This is because there were no dams constructed outside Iraq previously. For an appropriate appreciation, Soil Water Assessment Tool (SWAT) model was used to evaluate the impact of climate change on their discharge for a half-centennial lead time to 2046-2064 and a centennial lead time to 2080-2100. The suitability of the model was first evaluated, and then, outputs from six GCMs were incorporated to evaluate the impacts of climate change on water resources under three emission scenarios: A1B, A2 and B1. The results showed that water resources are expected to decrease with time.

Tigris River, Streamflow, SWAT, Climate Change

Abbas, N. , Al-Ansari, N. , Wasimi, S. and Al-Rawabdeh, A. (2019) Flow Variation of the Major Tributaries of Tigris River Due to Climate Change. Engineering, 11, 437-442. doi: 10.4236/eng.2019.118031.