2nd Int. Conf. On Fluival Hydraulics June 23-25, 2004, Naples, Italy, Riverflow 2004, Published by Balkema Study Navigation Problems in Nile River Reach at Elbogdady A.M. Negm Professor of Hydraulics, Civil Engg. Dept., College of Engg., Garyouns University, Benghazi, Libya, Email: amnegm85@yahoo.com M.M. Elfik, M.I. Attia and M.H. Nassar Associate Professors and Assistant Lecturer, Dept. of Water & Water Structures Eng., Faculty of Engineering, Zagazig Lecturer, Dept. of Water & Water Structures Eng., Faculty of Engineering, Zagazig University, Zagazig, Egypt ABSTRACT: The present paper concerned with investigation of solving natural sediment problems at Elbogdady reach, south Luxor staff gauge, 712.80 km U/S of Roda staff gauge on the Nile River. The main purpose of the paper is to investigate the navigation problems in the considered river reach and to suggest the best location for the required quay or platform. Proper solutions has been suggested and studied for sedimentation problems. Each alternative has been evaluated from both hydrodynamics and sediment transport points of view. The best proposal has been selected from a set of alternative proposals. A 2-D numerical model (SED-2) has been applied for simulating the sediment transport along the river reach. 1 INTRODUCTION Planning of harbors covers the collection, processing and using of the natural choice of location and orientation of major port components such as access channels, breakwaters, basins, quays and specialized berths. It covers also, the choice of type of structures for preliminary engineering and cost estimates as well as design criteria for the different structures. The conditions affecting the quays planning may be climatic conditions; winds, temperature, rainfall and Humidity. Oceanographic conditions; waves, tides, currents and Sediment transport may have an important effect on the quays planning. Topographic, hydrographic conditions and soil conditions effect on the quay location. The following properties of the navigation channel through navigable streams should be investigated carefully while the design procedure. Channel location and orientation, Channel width and side slopes, Channel minimum water depth, and Characteristics of the channel bends. The subjects of sediment transport and flow in alluvial streams are gaining it importance with the increasing utilization of water resources. Considerable research had been done in sediment transportation and the problems related alluvial streams in the past four decades by hydraulic engineers, geologists and researchers from other disciplines such as fluid mechanics. The knowledge of the distribution of sediment in the vertical is eventually used to compute the total suspended load carried by the stream. Observations in laboratory flumes and natural streams have shown that the concentration of suspended load in the vertical direction decreases with increase in distance from the bed. The sediment transported past a strip of unit width and thickness will be (c * u dz) c and u are the local sediment concentration and the local velocity respectively. The method of integrating (c * u) over the depth had been proposed by Einstein. H.A. 1942. Also, Bagnold. R.A. 1966.introduced an energy balance concept and related The suspended load transport to the work done by the fluid. Many authors had studied the simulation of sediment transport with various techniques. A number of attempts have been introduced including the laboratory investigations, the field studies and the numerical models. The numeric attempts have been surveyed. Paintal. A.S. 1971. investigated a stochastic model of bed load transport. Lung. W.S. & O’Conner, D.J. 1982 modified a 2-D mass transport equation in estuaries. Lin. P. & Shen, H.W. 1984. developed a 2-D model by characteristic method. Characteristic method was applied to analyze the two- dimensional unsteady flow over a bed of fine sediment. Cole. P. & Miles. G.V. 1983. developed a 2-D model of mud transport. The model studied the transportation of well-mixed cohesive sediments in estuaries and coastal waters. Van Rijn. L.C. 1986. investigated the mathematical modeling of suspended sediment in non-uniform flows. Galappatt., G. and Vreugdenhil. C. B. 1986.