Journal Title
Title of Journal: Nat Hazards
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Abbravation: Natural Hazards
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Publisher
Springer Netherlands
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Authors: Jetchau Wen Yenjen Lee Shinjen Cheng Juhuang Lee
Publish Date: 2014/05/13
Volume: 74, Issue: 2, Pages: 887-909
Abstract
This study examined changes in hydrograph characteristics of rural statuses to urban statuses on watershed divisions in Taiwan The main approach was to relate applicable model parameters with the corresponding imperviousness based on calibration and verification using a semidistributed model and 102 events The model structure is conceptual linear reservoirs with paralleltype cascaded storages which is represented by overland and channel coefficients The hourly mean rainfall of the watershed and its divisions were calculated using the Kriging method The timevariant rainfall losses were calculated using the constant percentage method The spatial and temporal model inputs division effective rainfall were obtained by subtracting mean rainfall of divisions from the rainfall losses In calibration the storage values of 50 events derived using appropriate parameter bounds were more reasonable than those using inappropriate bounds Based on the optimal interval method the overland storages displayed more marked change than did channel storage in response to imperviousness changes By contrast the channel storages were unaffected by the changes in urbanization The overland storages were related with the imperviousness by using the regression equations for determining their relationships in continuous changes of urbanized divisions The verification of the regression relationships was based on 52 events The results indicated that power linkage was an available selection for linking division parameters with the corresponding imperviousness Finally the study concludes 1 appropriate bounds in parameter calibration are useful for obtaining significant storage values and 2 the study results using these suitable storages indicated large changes in imperviousness on the downstream divisions marked urbanization resulted in reduced the time to peak at least 10 the peak discharge exceeded an increment of 20–30
Keywords:
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