期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2015
卷号：4
期号：11
页码：11464
DOI：10.15680/IJIRSET.2015.0411114
出版社：S&S Publications
摘要：The values of Manning‟s roughness coeffic ient “n” generally have been considered for any point inchannel bed as constant throughout the total time of prediction. But in real fie ld the value of Manning‟s “n” varies notonly depending on various factors such as channel irregularity, surface roughness, bed slope and vegetation cover butalso it varies at the same point with effect of unsteadiness . In this study equations for unsteady resistance have beenproposed using linear regression and spread sheet programming. Two unsteady resistance equations has been obtainedhere, one for high flood and another for moderate flood for a dam-break case in river Toce. The available data has beencollected from the CADAM project (1999) and analysis has also been done in order to observe the variation ofunsteadiness of water at various stations for both high flood and for moderate flood for the dam-break case.
关键词：Manning‟s roughness coefficient; bed slope; surface roughness; unsteady resistance.
