Conservation and Restoration of Aquatic Plants with Bed Erosion in Brackish Water Zone

本文讨论了波浪作用对主要生长在沿海地区的半咸淡水沉水大型植物刺槐生长的影响。采用安装在波浪水槽床下的小型双分量测压元件测量了作用在日本海参上的波浪力。波浪力太小，无法从底部沉积物中拉出刺槐枝。波浪作用下泥沙运移和河床发育，波浪型水槽的沙床上出现较大波纹时，刺桐枝从水槽的沙床上被拉出。通过室内实验研究了红树林和树木作为海岸防护的波浪透射和反射能力。用称重传感器测量了小尺度明渠水流中活松的阻力。在快速流动中，还测量了圆柱上的阻力。本文应用连续方程和能量方程对沿海地区红树林和树木的波浪透射和反射能力进行了理论分析。估算了大而密树冠红树林的有效波反射。

The effect of wave action on the establishment of Zostera japonica, a brackish submerged macrophyte growing mainly in coastal areas, is discussed. The wave forces acting on Z. japonica were measured by using a small two components load cell installed under the bed of wave flume. The wave forces were too small to pull out Z. japonica shoot from bottom sediment. Sediment transport and bed form development under waves were also observed, and Z. japonica shoot was pulled out from the sand bed of flume when large ripples appeared on the sand bed in wave flume.Laboratory experiments were performed to study wave transmission and wave reflection capacity of mangroves and trees as coastal protection from waves. Drag forces on a live pine in small scale open channel flow were measured by using a load cell. Drag forces on a circular cylinder in rapid flow were also measured. A theoretical analysis based on application of the continuity and energy equations to flow through the rows of trees were made to evaluate wave transmission and wave reflection capacity of mangroves and trees in coastal area. The significant wave reflection from mangroves with large and dense canopy was estimated.