2.3. Case study

The daily discharge and sediment measurement in South Korea are provided by K-water. The total sediment discharge is calculated by K-water using BORAMEP, version 1.8. In this study, the total sediment load will be recalculated by SEMEP and compared with the result of BORAMEP.
We analyzed the daily discharges and sediment measurements of 35 gaging stations in South Korea, including seven gaging stations on the Han River, fourteen on the Nakdong River, five on the Geum River, five on the Yeongsan River, and four on the Seomjin River, respectively (Fig. 1). The total area of the studied watersheds covered 47,000 km2. Among 2084 sediment samples, 2036 were measured by depth-integrating using D-74, the rest with a P-61 or a grab sampler. Only the samples of depth-integrating sampler were used in this study. The grain size distribution of bed material and suspended material were provided at all stations. Bed materials were sampled using the US BM-54 bed material sampler, 60L Van Veen Grab sampler or by grid sampling. The grain size distributions of suspended material were determined by laser diffraction. The lengths of record are summarized in Fig. 2, and a detailed data description and analysis is available in \cite{Julien2017}.

3. Results and Discussions

3.1. Ratios to total sediment discharge