PREDICATION OF SEDIMENT TRANSPORT In Al-ABBASYIA BARRAGE USING THE INVERSE MONITORING METHOD

Abstract

Iraq hasthe two biggestrivers,Tigris and Euphrates. In the past few years, a considerable level drop in these rivers has been observed due to the reduction in upstream water flowrate.There are many problems concurrent with this droplike the movement of sediment and it'strapped. In recent years,the science of computational fluid dynamics (CFD) has increasingly been used to investigate sediment transport problems in rivers and reservoirs. The current presentation will give examples of our research in this topic. First,the main numerical algorithms for water and sediment flow are briefly introduced. Then, thedata from the numerical model are compared with measurements (Verification). The second goal is more oriented towards fundamental research and involves idealized flow downstream barrage. Al Abbasyia barrage wasselected as a case study. It is located near Najaf governorateand controlled the discharges toward downstream land. This study present the new technique to predicate the sediment movement and its amount called Inverse Monitoring Method (IMM).The new method was depended on by monitoringthe downstream barrage(sediment movement and amount)to find the optimum operation runningin upstream. This study divided to two parts, first one was verification the model in this region and second one was predicate the amount of sediment for one year in study reach. The CFDmodel (Simulate Sediment Intake in Multi-block option) was used to do this study. This Model is new software produced by The Norwegian University of Science and Technology (Olsen, 2006). Al Abbasyia barrage consist of six radial steel gate.In each time the CFDmodel was simulatedone gate opening or in operation runningfor one year. That mean it has six casestosimulate the best gate. In this study found the best running gate to reduce the amount of the sediment in upstream was when used gate number four with 7.51×104 Ton thatmean 28127 m3as a volume if taken the field density 2670 kg/m3 in consideration.