EFFECTS OF DIKES ON NAVIGATION IN BRAIDED CHANNEL, THE AYEYARWADY RIVER, MYANMAR

摘要

This study presents sediment transport characteristics and sediment related problems in thernAyeyarwady River first and the proper use of dikes to keep the navigable flow depth in a main channel ofrnbraided channels is discussed. The study reach is 25 km long around Mandalay City along thernAyeyarwady River in Myanmar. The depth integrated two dimensional bed deformation analysis has beenrnperformed to understand the change of the flow pattern and bed deformation characteristics in braidedrnchannels. The bed deformation analysis is carried out under two conditions such as with dike and withoutrndike installation. In case of the simulation with dikes, installation of the dikes in bifurcated channels isrneffective to suppress the temporal change of the main channel which is used for ship navigation. It isrnconsidered that these dikes would be effectively reduced the dredging frequency.