The influence of temporal variation of rainfall on linear-nonlinear response of mountainous catchments
Message:
Abstract:
In this study, the influence of temporal variation of rainfall on linear-nonlinearresponse of three mountainous catchments in south west of Iran was examined. Atfirst, the storm events were categorized into two categories including low temporal(LT) and high temporal (HT) heterogeneous events according to their temporalvariation. Then, Watershed Bounded Network Model was applied to assess thecatchment response influenced by rainfall temporal heterogeneity. Three differentnonlinear parameters of m  0.50, m  0.61, m  0.77 as well as m 1.0 (linearresponse) were used. The obtained results indicated that rainfall temporalvariability plays an important role on the hydrologic response of the catchments.When temporal heterogeneity of rainfall was decreased, the response of catchmenttended to be more nonlinear and the value of m  0.50 resulted in more appropriateestimation of outlet hydrograph. However, by increasing temporal heterogeneity ofrainfall, less nonlinear response of catchment was obtained. The nonlinear value ofm  0.61 resulted in the most appropriate simulation of outlet hydrographs for hightemporal variation events. Moreover, it was found that antecedent wetness of soilhas an important effect on the response of catchment so that more nonlinearresponse can be expected in dry condition of soil rather than wet condition. Whenthe catchment is in wet and saturated conditions due to previous rainfall, thenonlinear value of m  0.77 and linear value m 1.0 can be used respectively.
Language:
Persian
Published:
Water and Soil Conservation, Volume:20 Issue: 6, 2014
Pages:
219 to 235
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