Isochrones Mapping Methods in Time-Area Routing Technique

Document Type : Original Article

Authors

1 Assistant Professor of International University Of Imam Khomeini, Ghazvin, Iran,

2 Associate Professor of Soil Conservation and Watershed Management Center, Tehran, Iran

Abstract

The Time–Area method is a suitable technique for watershed routing and can be potentially used as a distributed model.  As an advantage, it can also be used as a GIS-based method. The performance of the existing methods for deriving isochrone locations is compared in this study with that of the kinematic wave theorem. In most methods, travel time is proportional to the distance-to-outlet of any point raised to a power. Investigating the numerical value of powers, it is shown that exponent 1.5 of Laurenson’s method yields the closest time-area hydrograph to that of the kinematic wave solution. Therefore, this paper showed that certain empirical isochrone delineation methods could be applicable provided that the travel length is measured towards the outlet.

Keywords

References

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Iran-Water Resources Research
Volume 2, Issue 3
June 2007
Pages 39-50

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History

  • Receive Date: 19 July 2005
  • Revise Date: 20 September 2006
  • Accept Date: 23 October 2006

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