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                            Sediment temporal-spatial distribution and geomorphological evolution
                               in the Huayuankou-Gaocun reach in the lower Yellow River

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                                                                                      1
                                                                         2
                      ZHANG Jinliang 1,2 ,LI Yan ,BAI Yuchuan ,XU Haijue ,LUO Qiushi ,HUANG Zhe     2
                                  (1.Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou  450003,China;
                            2. Institute for Sediment,River and Coast Engineering,Tianjin University,Tianjin  300072,China)
                   Abstract: The sediment entering the lower Yellow River has been dramatically reduced, and the geomor⁃
                   phology has changed greatly during the operation of the Xiaolangdi (XLD) reservoir since 2000. However,
                   the floodplain currently faces competition between land development and protection. This research presents a
                   detailed investigation of the sediment temporal-spatial distribution and  geomorphological evolution of the
                   braided reach between Huayuankou (HYK) and Gaocun (GC) during 2000-2017, using digital elevation
                   models (DEMs) and the historical bathymetry of the braided reach. During the implementation of the wa⁃
                   ter-sediment regulation scheme (WSRS), the long-term low-concentration flow released from XLD leads to
                   a fully scoured long channel, and effectively reduce the risk of floods on floodplains. However, the flood⁃
                   plains have gradually changed from sedimentation to erosion due to the continual construction of farm dykes
                   and control works,land use changes and other forms of land disturbance,including water and soil conser⁃
                                                                                                6  3
                   vation measures and climate change. The cumulative eroded volume was approximately 1137.3 × 10 m be⁃
                                                                6
                                                                   3
                   tween HYK and GC from 2000-2017, of which 214.5×10 m originated from the floodplains. It is neces⁃
                   sary to reconstruct the floodplain domain into different regions via mechanical dredging and other measures,
                   and optimize the use of land resources.
                   Keywords: lower Yellow River; braided reach; sediment distribution; morphology evolution; floodplain re⁃
                   construction
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