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|Contributors: ||NTOU:Department of Harbor and River Engineering|
moving storm;runoff hydrograph;kinematic;wave theory
|Issue Date: ||2011-10-20T08:10:59Z
abstract:In general, the spatial distribution of rainfall is considered uniform in conventional hydrologic models for rainfall-runoff simulations. Thus the influences of a moving storm on hydrographs at the watershed outlet are always neglected. In this study, a dimensional analysis technique was used to obtain the influence factors for numerical testing. Since the kinematic wave theory has been considered acceptable in steep watersheds, a nonlinear numerical scheme for kinematic wave approximation was applied to simulate the runoff on a single overland plane and on a V-shape overland model.
Results of the numerical tests indicate that for storms moving downstream, the runoff contributing from entire watershed can be attained, although the storm length is shorter than the length of the overland plane and the rainfall duration is less than the time of concentration of the plane.
This phenomenon of the runoff contributing from entire watershed is in contradiction to the recognition in conventional hydrology. Various storm lengths and watershed geomorphic conditions were used in the numerical tests to classify the flow condition for attaining the runoff contributing from entire watershed. The results are expected to be useful for the planning and design of water resources engineering works.
|Relation: ||18(4), pp.505-514|
|Appears in Collections:||[河海工程學系] 期刊論文|
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