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Shope, Christopher L. ; Bartsch, Svenja ; Kim, Kiyong ; Kim, Bomchul ; Tenhunen, John ; Peiffer, Stefan ; Park, Ji-Hyung ; Ok, Yong Sik ; Fleckenstein, Jan ; Koellner, Thomas:
A weighted, multi-method approach for accurate basin-wide streamflow estimation in an ungauged watershed.
In: Journal of Hydrology.
Bd. 494
(2013)
.
- S. 72-82.
ISSN 0022-1694
DOI: https://doi.org/10.1016/j.jhydrol.2013.04.035
Abstract
River discharge is a commonly measured hydrologic variable; however, estimate uncertainty is often higher than acceptable limits. To quantify method limitations and spatiotemporal variability, a multi-year hydrologic flow partitioning investigation was completed under monsoonal conditions in the ungauged complex terrain of the Haean Catchment, South Korea. Our results indicate that sediment transport from a single annual monsoonal event can significantly modify the channel cross-sectional area resulting in inaccurate stage-discharge rating curves. We compare six discharge measurement methods at 13 locations that vary in slope from 1% to 80%, with discharge ranging up to four orders in magnitude, which enabled us to weight the accuracy of each method over a specific range in discharge. The most accurate discharge estimation methods are the weir, the acoustic Doppler current profiler, and the in-stream velocity area method; however, under certain conditions each of these methods is less desirable than other methods. The uncertainty in the three methods is on average 0.4%, 4.7%, and 6.1% of the total discharge, respectively. The accuracy of the discharge estimates has a direct influence on the characterization of basin-wide hydrologic partitioning, which can lead to significant variability in sediment erosion rates and nutrient fate and transport.