Figure 2
(A) Location of slackwater deposits (SWDs) at Shuangyu Village. Orthographic image taken on May 11, 2020, by the Dajiang unmanned aerial vehicle (UAV); (B) upper part of sedimentary section; (C) lower part of sedimentary section. The total thickness of the section is 2.6 m. SO1 to SO4 denotes luminescence dating samples and SC1 to SC4 denotes radiocarbon dating samples; (D) cross-section and sedimentary sequence of the Shuangyu SWD. The two cross-sections were derived from the UAV survey on May 11, 2020 (solid line) and the Advanced Land Observing Satellite (ALOS) 12.5 DEM (dashed line). The water level is estimated as ca. 3 m based on the mean discharge of 520 m3/s in May. The ALOS DEM is consistent with the UAV survey at the main channel and floodplain without big alteration by the 2000 AD flood, but differs by up to 25 m on riverbanks and hillslopes.
