نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار /دانشگاه ببن المللی امام خمینی (ره)،دانشکده فنی و مهندسی، گروه مهندسی آب ، قزوین، ایران
2 دانشیار /مرکز تحقیقات حفاظت خاک و آبخیزداری، تهران، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
This paper studies available methods for isochrone delineation in converging flow and compare those with kinematic wave approach. This paper also tries to introduce a method based on wave motion theory instead of empirical methods. Authors in their pervious research on parallel flow showed that many of the available methods give travel time with supposition of proportionality of time to equilibrium with an exponent of distance of points to outlet. Investigation on a large range of exponents shown that using the exponent derived from Kinematic wave theory, is the best one and gives the closest answer to analytical solution for rising limb of hydrograph. The obtained results for converging flow approve the results achieved in parallel flow analysis. The equations governing on Converging flow is so complicated that there are only a few solutions for rising limb of hydrograph. The time–Area method is one of the most suitable and the simplest techniques of watershed routing, and can be potentially used as a distributed model. Linking this model with GIS software is easily performed. Results of the present research, by omitting the limitation of empirical delineation of isochrones, make Time Area method capable of solving overland flow on watersheds of any type, easily and perfectly.
کلیدواژهها [English]