الفهرس | Only 14 pages are availabe for public view |
Abstract Many regions of the nile river are subjected to continuous morphological changes such as bank failure, bed degradation, aggradations, and formation of new island. Some of these changes have resulted as a side effect to manmade interventions. These morphological changes have negative impact on the efficiency of navigation, pump intakes, and may cause the loss of agriculture lands. A serious and harmful example of such interventions to the river occurred at el-rayramoum district; at which the people construct a road to ferryboat which extended about 400 meter across the river nile.A detailed survey for the river bed and banks were conducted at the site on 2005.The survey results were compared with old maps of year 1982, before the intervention.The results indicated that several morphological changes occurred at the site, where erosion took place at the east bank, and great deposition occured at the west bank. Surface water modeling system SMS, was used to simulate the study area to predict the expected changes at flood flow condition.Moreever, The model was also used to test the best alternative to reduce the negative impact on the river.The model was calibrated using actual measurements including bed levels data, water levels, water current velocity measurements and grain size distributions of bed samples.Location of erosion zones were determined by estmating the zones subjected to velocity larger than incipient velocity. Three solutions were tested to remove a portion which the river and affect its characheristics . The three tested portions were removing 25%, 50% and 75% of the road length.The locations of erosion and sedimentation zones were determined.The study recommended the best solution to reduce the harmful effects on the nile river morphology. |