انجمن هیدرولیک ایران
نشریه هیدرولیک
2345-4237
3
4
2009
01
20
Estimation of Travel Time in Overland Flow via Diffusive Wave Approximation
برآورد زمان پیمایش جریان دامنه ای با استفاده از تقریب موج پخشی
1
12
85478
10.30482/jhyd.2009.85478
FA
سعید
گلیان
بهرام
ثقفیان
محمود
ذاکری نیری
Journal Article
2008
03
22
Different analytical methods such as kinematic wave (KW) and diffusive wave (DW) approximation<br />can be used to investigate the overland flow mechanism. In this article, for the first time, the results of<br />these two methods are compared in calculating the travel time of flow over a rectangular plane.<br />Positions of isochrones and the effect of bed slope on travel time are also investigated. It is elaborated<br />that travel time of the rectangular plane in diffusion wave approximation is greater than that of the<br />kinematic wave approximation. For example, by decreasing bed slope from 0.01 to 0.001 the travel<br />time will increase by 99% in kinematic wave approximation and 130% in diffusive wave<br />approximation. Also, the relative difference of the two methods will increase by 14%. It is also<br />deduced that by decreasing the bed slope, the difference between the two subsequent isochrone<br />distances will become greater in diffusion wave approximation than that of the kinematic wave<br />approximation. On the other hand, with 10% of relative difference between kinematic and diffusive<br />waves the criterion of 2<br />0 0 K F < 5 would be fulfilled.
http://jhyd.iha.ir/article_85478_670587df7ed221056dbaab0070a7aaca.pdf