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|Contributors: ||NTOU:Department of Harbor and River Engineering|
Rainfall-runoff simulation;Linear hydrologic model;Nonlinear hydrologic model;Scaling effect
|Issue Date: ||2011-10-20T08:11:28Z
abstract:Watershed runoff process is usually recognized as a linear system in conventional rainfall-runoff modeling. Consequently, storm runoff can be simulated by using a hydrologic response function applying linear proportionality and linear superposition techniques. Nevertheless, nonlinearity is usually to be observed through watershed hydrologic records analysis and has shown in hydraulic flow equations. It induces a question that if flow nonlinearity is the main reason to result errors in runoff predictions. In this study, hydrologic records from three watersheds in Taiwan were collected for analysis to realize the watershed nonlinear relationships in rainfall-runoff process. The unit hydrograph method and linear reservoir method, which are based on the linear hydrologic theory, and the variable unit hydrograph method and the kinematic-wave based geomorphic instantaneous unit hydrograph method, which are based on the nonlinear hydrologic theory, were used for runoff simulations and to analyze the influences of storm scale on rainfall-runoff nonlinearity. Results show that the relation between storm scale and runoff generation is highly nonlinear. High rainfall intensity generates a larger unit hydrograph peak and a shorter time to peak discharge, which is contradictory to the linear hydrologic theory assuming a unique unit hydrograph for a specified watershed.
|Relation: ||52(4), pp.25-38|
|Appears in Collections:||[河海工程學系] 期刊論文|
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