Raingauge significance evaluation based on mean hyetographs |
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Authors: | Shin-jen Cheng |
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Institution: | (1) Department of Environment and Resources Engineering, Diwan University, 87-1, Nan-shih Li, Madou, 721, Tainan, Taiwan |
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Abstract: | This study mainly explores the best relationship between hydrograph parameters and urbanized factors in urbanized areas. Urbanization
of a developing watershed is analyzed through 51 available rainfall-runoff simulations from 1966 to 2002. Forty of these rainfall-runoff
events were calibrated to determine the relationships between impervious area and urbanized factors. During the calibration
process, the block Kriging method was used to estimate the mean rainfall, and its hourly excesses were calculated by nonlinear
programming. Then, clear tendencies between parameters and urbanized factors were produced by comparing the results of the
annual average and optimal interval methods. The remaining eleven cases were used to verify the established relationships.
The calibration and verification results confirm that the integral approaches used in this study can effectively illustrate
the hydrological and geomorphic conditions in complex urbanized processes. Parameter n responds more sensitively than parameter k to increasing impervious area and population density. Additionally, parameter n responds more strongly to imperviousness than to population. Therefore, this study demonstrates that an impervious area is
the main consequence of ongoing urbanization in the Wu-Tu watershed. The satisfactory results show that kernel response of
the watershed would be more sharp-pointed and be shifted forward in peak due to an increased impervious cover. |
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Keywords: | |
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