Application of MIKE21 Software in Flood Routing of Tidal Rivers: A Case Study of the Zohre River

Document Type : Technical Note

Authors

1 Faculty Member, SCWMRI

2 Head, Southern Khorasan Department of Watershed Management

3 Prof., College of Agriculture, Isfahan University of Technology

Abstract

Flood routing is of special importance from different aspects of river engineering such as flood zoning, flood forecasting, etc. There are two methods employed in river flood routing, hydraulic and hydrological. Hydrological methods are used when the river is at low tide and, hence, cannot be employed to analyze floods caused by the tide. Hydraulic methods must be employed in tidal rivers when the direction of the current reverses at high tide. In this research,MIKE21 modeling software was used for the flood routing of the Zohreh tidal river. The model was calibrated by surveying the river, taking samples form the river bed, measuring sea water level and the velocity of the river flow. Analyzing the sensitivity of the model showed that the coefficient of determination, root mean square error and relative error were 0.95, 0.032, and 0.27, respectively, all indicating the efficacy of the model in simulating different parameters such as velocity, flow rate, and water surface profile. The flood routing results of the tidal currents showed that the hydrograph of the influent and effluent to the reach at high tide (when the current direction is from sea to the river) was similar to the normal flood routing of the river, but at low tide (when the current direction is from the sea to the river) influent and effluent hydrograph would not follow the laws of normal flood routing.
 

Keywords

References

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Journal of Water and Wastewater; Ab va Fazilab ( in persian )
Volume 17, Issue 4 - Serial Number 4
Serial number:60
January 2007
Pages 89-96

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