NDLI: Changes of rural to urban areas in hydrograph characteristics on watershed divisions

Content Provider	Springer Nature Link
Author	Wen, Jet chau Lee, Yen jen Cheng, Shin jen Lee, Ju huang
Copyright Year	2014
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 parallel-type 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 time-variant 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 %.
Starting Page	887
Ending Page	909
Page Count	23
File Format	PDF
ISSN	0921030X
Journal	Natural Hazards
Volume Number	74
Issue Number	2
e-ISSN	15730840
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-05-13
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Block Kriging Watershed divisions Parameter bounds Semidistributed model Hydrograph characteristics Natural Hazards Hydrogeology Geophysics/Geodesy Geotechnical Engineering & Applied Earth Sciences Civil Engineering Environmental Management
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science Water Science and Technology

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