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Paper Information

Journal:   INTERNATIONAL JOURNAL OF INDUSTRIAL ENGINEERING AND PRODUCTION MANAGEMENT (IJIE) (INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE) (PERSIAN)   Summer 2003 , Volume 14 , Number 2; Page(s) 7 To 7.
 
Paper: 

NEW ENVELOPE SECTIONS METHOD TO STUDY HYDRAULICS OF COMPOUND VARYING RIVER CHANNELS USING A DEPTH-AVERAGED 2D MODEL

 
 
Author(s):  AYOUBZADEH SEYED ALI, ZAHIRI A.A.R.
 
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Abstract: 
Several 1 D or 2D models have recently been developed by various researchers for the study of flow in compound channels, both in laboratory flumes and natural rivers. In all of these methods, only one typical geometry of channel under consideration must be assumed. This assumption is valid as long as the total changes in cross section over the period of consideration could be ignored. However, in some natural rivers, this is not so and the discrepancy in bed levels during the period under consideration is too great to ignore due to mobility of the channel boundary arising from flood events. In the present research, the channel crosses section of Minab river. At Brentin Hydrometry Station is considered as compound channel. Over a period of only three years, the channel cross section varied significantly. The variation of water depth has been 1.5 m in comparison with the maximum water depth of nearly 4 to 4.5m. In this case, to evaluate the hydraulic behavior of the channel, it is no logical to consider only one geometry. To overcome this problem in general, a new method called the Envelope Sections Method (ESM) has been developed and is illustrated in this paper. The method have been validate against available river gauging data by simulating the stage-discharge relationships for both ordinary and flood flow conditions using detailed information of Minab river and is compared with the observed data. The new method has wide implications for open channel hydraulics, river engineering and flood management in channels with similar hydraulic behavior of highly variable boundaries as observed in Minab River.
 
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