黄河下游花园口-高村河段泥沙时空分布及地貌演变

小浪底水库投入运行以后,黄河下游河道地貌发生巨大变化,滩区治理面临土地保护与开发利用之间的矛盾.本文基于地形空间插值与实测资料研究了花园口-高村宽滩游荡型河段在2000-2017年间的泥沙分布特征及滩区地貌演变情况,并提出滩区改造方案.研究发现,由于小浪底水库拦沙作用,长期低含沙水流下泄导致河床形态调整加剧,主槽冲刷明...

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

The sediment entering the lower Yellow River has been dramatically reduced, and the geomorphology 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 water-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 floodplains 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 conservation measures and climate change. The cumulative eroded volume was approximately 1137.3×10⁶ m³ between HYK and GC from 2000-2017, of which 214.5×10⁶ m³ originated from the floodplains. It is necessary to reconstruct the floodplain domain into different regions via mechanical dredging and other measures, and optimize the use of land resources.