黄河下游的堤防、土坝和引水建筑物,大都修建在具有不同透水性的冲积土上。在汛期或高水时期,发生渗透变形的地方往往較多,而且有的地方还相当严重。为了保証黄河下游大堤和閘坝工程的安全,几年来,黄河水利委員会所属的有关部門和其他一些单 Embankments, earth dams and diversion structures in the lower Yellow River are mostly built on alluvial soil with different permeability. In flood season or high water period, infiltration and deformation occur often more places, and some places are still quite serious. In order to ensure the safety of the embankments and sluices in the lower Yellow River, the relevant departments under the Yellow River Conservancy Commission and some other single