|نویسندگان||Zakery, M - Saghafian, B - Golian, S - Moramarco, T - Shamsaee, A|
|نشریه||J. of Hydrologic Engineering, ASCE|
|ارائه به نام دانشگاه||Technical and Engineering Department, Science and Research Branch Islamic Azad University|
|ضریب تاثیر (IF)||1.96|
|نوع مقاله||Full Paper|
|کشور محل چاپ||ایالات متحدهٔ امریکا|
Derivation of travel time based on Saint-Venant equations may substantially improve rainfall-runoff routing, particularly in the Clark approach and GIS-based hydrological routing models. Kinematic wave (KW) and diffusive wave (DW) approximations are often applied in lieu of the dynamic wave (DYW) solution to study overland flow regime. In this study, for the first time, travel-time relationships are presented based on DW approximation. In terms of equilibrium time, the DW approximation improved results from 5% up to 15% over the KW approximation. After obtaining the semianalytical solution of the DW travel time, discharge hydrographs over a rectangular plane through the well-known time-area method were derived. Considering the DYW solution as the benchmark, it was found that the time-area approach by adopting the proposed DW wave travel time formulation, provided satisfactory results for 2.5<K0F20<25 and F0>0.1. Using the travel time based on KW approach, the time-area method was found fairly accurate for K0F20>25 and F0>0.1. K0 and F0 are the well-known kinematic wave number and Froude number, respectively. Therefore, it is perceived that as K0F20 decreases, the difference between KW and DW approximations becomes greater.