TY - JOUR
T1 - A weighted, multi-method approach for accurate basin-wide streamflow estimation in an ungauged watershed
AU - Shope, Christopher L.
AU - Bartsch, Svenja
AU - Kim, Kiyong
AU - Kim, Bomchul
AU - Tenhunen, John
AU - Peiffer, Stefan
AU - Park, Ji Hyung
AU - Ok, Yong Sik
AU - Fleckenstein, Jan
AU - Koellner, Thomas
N1 - Funding Information:
Support from the Interdisciplinary Research Project TERRECO funded by the German Research Foundation (DFG) at the University of Bayreuth is greatly acknowledged. We appreciate the field assistance provided by Jaesung Eum, Axel Müller, and the students of the TERRECO International Research and Training Group. The isotope abundance analysis and contributions of the BayCEER Laboratory of Isotope Biogeochemistry at the University of Bayreuth is greatly appreciated. This manuscript was substantially improved by the technical review and contributions of the editor, Geoff Syme, two anonymous reviewers, and Jeanne Riley.
PY - 2013/6/8
Y1 - 2013/6/8
N2 - 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.
AB - 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.
KW - Baseflow
KW - Discharge
KW - Korea
KW - River
KW - TERRECO
KW - Topography
UR - http://www.scopus.com/inward/record.url?scp=84878452454&partnerID=8YFLogxK
U2 - 10.1016/j.jhydrol.2013.04.035
DO - 10.1016/j.jhydrol.2013.04.035
M3 - Article
AN - SCOPUS:84878452454
SN - 0022-1694
VL - 494
SP - 72
EP - 82
JO - Journal of Hydrology
JF - Journal of Hydrology
ER -