Abstract
The properties of a river flow strongly depend on the shape of river valley. Especially the magnitude
of flooding downstream a dam significantly changes with respect to the shape of downstream river
valley. There are different shape parameters of the river valley which could affect the flow through a
river. This paper focuses on the impact of valley slope and width on main flow characteristics (discharge
and water level) in case of flooding. As a basis for systematic hydraulic analysis, the Jhelum river valley
downstream of Mangla dam in Pakistan has been considered. First the Jhelum river valley has been
classified according to the available river classification systems and then artificial new valley shapes
have been produced by making different changes in valley slope and width with respect to the available
guidelines. For all valley shapes, unsteady flow modeling has been carried out by using the model MIKE
11 for different flooding scenarios. The changes in flood routing results of different valley shapes have
been analyzed. This study would guide in assessing the behavior of other river valleys in the world with
respect to the severity and extension of flooding. The results of this study would also be helpful in
planning structural and non-structural flood safety measures for river valleys in Pakistan as well as in
other parts of the world.
Saqib Ehsan, Walter Marx. (2011) Impact of River Valley Shape on Flow Characteristics in Case of Flooding, Pakistan Journal of Engineering and Applied Sciences, Volume 8, Issue 1.
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