Conclusion
The conclusion of this study can be summarized as follows:
- The generated numerical model was successfully implemented by its
capability of representing the study area’s geometric and
morphodynamic characteristics to accomplish this study objective.
- Morphological changes evaluation from the numerical model application
shows that the prevailing trend is deposition in the Rosetta branch.
- Results show that during a period of 17 years from 2003 to 2020 the
amount of deposition and erosion was found to be 12.6 and 5.8 million
m3 respectively, and annual maximum deposition and
erosion rate are 22 and 12 cm respectively.
- Rosetta branch experienced a reduction in the maximum conveyance
capacity by a percentage of 25%. The maximum flow discharge the
branch can convey is 30 million m3/day in comparison
with 40 million m3/day during the year 2003.
- The second proposed scenario is considered the optimum solution of the
three scenarios as it increased the maximum conveyance capacity of the
Rosetta branch to 50 million m3/day, reducing
inundated land area by an average percentage of 21%, and reduced
average stream velocity by 3.8%.
- Dredging operations cause a direct and immediate impact on increasing
maximum conveyance capacity but have disadvantages on lowering surface
water elevation and operations cost.