Water Flow Simulation of Tigris River Between Samara and Baghdad Based on HEC-RAS Model


This work aims to use the digital elevation model (DEM) or 3-Dimensional surfaceto model and analyze the water flow in the Tigris River. The first stage of thisstudy is based on filed data acquisition survey at 38 stations. These stations wereadopted to implement the one-dimensional steady and unsteady numerical flowmodels. The HEC-RAS software was used to implement these models. The mostimportant results of the steady-state model were that the maximum discharge andvelocity and minimum flow area were 638.17 m3/sec, 2.12 m/sec and 301.42 m2respectively. These values occurred at station 66+700. While, the minimumdischarge and velocity and maximum flow area were 504.5 m3/sec, 0.13m/sec and4758.13 m2respectively. The results of unsteady state were analyzed based on therecorded discharge in the year 2018. The maximum and minimum discharge (flowvelocity) were 638.12 m3/sec (2.42 m/sec) at the stations 94+666+7 and 635.57m3/sec(0.14 m/sec) at station 00+00, respectively. The maximum and minimumFroude number were 0.52 and 0.02 at stations 94+666+7 and 04+800, respectively.These results help to identify the flow choking areas that cause defects. In addition,it can be the base for determining the critical sedimentation stations in which thebed level rises and aggravate the flow choking problem within the consideredreach of the Tigris River.