长江中游河漫滩滩面守护结构试验研究

Experimental research on beach face guardian structure of washland in middle reach of the Yangtze River

以长江大马洲水道为原型,将植草格作为新型守护结构形式引入护滩工程。结合丙寅洲外滩滩面的水流和泥沙运动特点,建立概化水槽模型,进行了植草格对水流结构的影响及滩面防冲刷效果的试验研究。铺设植草格后滩面近底流速明显降低,对格内回填沙的稳固作用较为明显,为植草格内植被的生长提供了良好条件。在丙寅洲上游段外滩滩面流速较大的区域,采取植草格生态守护措施是可行的。

Taking the Damazhou waterway as the prototype, we introduce the grass grid as a new guardian structure into the beach protection engineering. According to the characteristics flow and silt motion of Bingyin delta beach, we set up the generalized flume model to study the grass grid＇s the influence on the flow structure and beach face scour prevention effect. After laying grass, the flow velocity of the beach face near bottom is decreased obviously and thus has an obvious effect of stabilizing the backfill sand and provides favorable conditions for the growth of grass vegetation. In the upstream segment of Bingyin delta beach where the face velocity is larger, it is feasible to take grass grid guard measures.