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Sub-Bankfull Flow Frequency versus Magnitude of Flood Events in Outlining Effective Discharges. Case Study: Trotuș River (Romania)

Department of Geography, Faculty of Geography and Geology, Alexandru Ioan Cuza University of Iasi, Iasi RO-700505, Romania
Water 2018, 10(10), 1292; https://doi.org/10.3390/w10101292
Received: 25 July 2018 / Revised: 31 August 2018 / Accepted: 6 September 2018 / Published: 20 September 2018
(This article belongs to the Section Hydrology)
Effective discharge, which represents the flow, or range of flows, that transport the most sediment over the long-term, was determined based on the mean daily flow discharge and mean daily suspended sediment discharge recorded between 1994 and 2014 at four gauging stations along the Trotuș River. This study proposes an efficient method for the estimation of effective discharge based on observed values of the suspended sediment load. By employing this method the suspended sediment load is no longer either under- or overestimated as in the cases when the assessment is based on sediment rating curves. The assessment on effective discharge was performed at two distinct levels: for the entire data series during the investigated time spans and, subsequently, for flows less than the bankfull discharge. The effectiveness curves of the suspended sediment transport characteristics revealed highly multimodal characteristics with many peaks, indicating ample ranges for the effective discharges. The main effective discharge corresponded to large flood events, which are typical for the upper end of the discharge range, whereas the secondary effective discharges corresponded to sub-bankfull flows, which are more frequent. The changes that occurred in the channel bed are reflected by the temporal variations in the effective discharge. View Full-Text
Keywords: effective discharge; suspended sediment load; magnitude-frequency analysis; sub-bankfull flow; temporal variation; geomorphic threshold effective discharge; suspended sediment load; magnitude-frequency analysis; sub-bankfull flow; temporal variation; geomorphic threshold
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Dumitriu, D. Sub-Bankfull Flow Frequency versus Magnitude of Flood Events in Outlining Effective Discharges. Case Study: Trotuș River (Romania). Water 2018, 10, 1292.

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