1/f noise analyses of urbanization effects on streamflow characteristics

摘要: Nonstationary hydrologic behaviour resulting from rapid industrialization and urbanization, combined with climate change effects, likely produces greater challenges in water resources flood risk managements. Our country-wide analyses for South Korea, based on spectral analysis technique, revealed how streamflow characteristics have shifted towards a less memory state, which indicates weaker temporal autocorrelation the time series. Specifically, we analysed 1/fα noise of 78 unit watersheds five major river basins Korea to investigate effects urbanization stream responses over 30-year period. The average slope runoff spectra, α0, was 0.94 ± 0.20, indicating that runoffs are characterized by pink noise. distribution α0 showed convergence <0.5 increasing clear effect loss due expanded impervious surface areas watersheds. Among examined, 59 bi-fractal scaling regimes, scale break points located around 17.5 days. Analysis three slopes, (average), αL (in low-frequency domain), αH high-frequency threshold ratio (UR) ~15% all slopes decrease, additional thresholds UR 6–7% found increase as increases. While result complex compound interplay among many factors such topography, seems dominantly control properties homogenization various Copyright © 2015 John Wiley & Sons, Ltd.