SEDIMENTATION PROBLEMS OF NAHR GHASR AND IDEAS FOR SOLUTION AND METHODS FOR INCREASE SPEED OF MORPHOLOGICAL SIMULATION

Nahre-ghasr is a natural tidal stream at arvand kenar beach, which is derived from Arvand River. It is located in front of Faw city (48 ˚ 31′ E and 29 ˚58′ N). Bed material in the area is cohesive mud. A fishery harbor has been constructed in Nahre-ghasr by 2009. During the construction of the port, the width and depth of the natural channel has been increased in order to allow operation of vessels. After 4 years the bed was stricken to 1.5 m sedimentation in the entire length of the channel (1800m) while the initial guess was 0.5 m sedimentation for this period of time. The target of this paper is to investigate the sedimentation problem and its solution as well as to provide methods to reduce regarding 2d-simulation time. Another study have been done previously in this regard (Orooghi-2015). But is has focused on sedimentation at the intersection of Nahre-ghasr and Arvand River. This paper studies the entire channel length. To reduce sedimentation of fine-grained material in a tidal creek, several technics have been studied. Some of them are (bailard-1987), (CC Inglis Allen FH &-1957) and (Komura-1966). The basic idea is increasing the current speed by decreasing the cross section or by increasing the water discharge. Real-world solutions need numerical simulation for optimization. One- and two-dimensional models may be used in this regard.some of them are (Cayocca, F-2001), (R., Alfageme, S., and Irish, J. L-2003).