Field observations on bottom profile and vertical distributions of sediment for the modelling of sediment transpotation process

沉积物的定量和定性分布对于海岸带的合理管理都具有重要意义，本研究从2009年开始在日本上越-绪方海岸进行了以下几项野外观测，以研究沉积物沿海岸方向和断面的分布情况。GPS测深仪测量海底剖面;沉积物取样（在底部表面），3.钻孔岩芯取样主要结果如下1.只有细砂沉积在沙洲2的近海。部分样品中观察到层状结构，其深度约小于1 m3。粗砂和极粗砂存在于靠近海岸线的岩心样品中4。槽中的非常粗的砂和粘土层。分层结构是最近的高波条件混合过程的结果。泥沙的垂向分布既反映了现有泥沙的定性信息，又反映了外力作用下泥沙的混合历史。

Both quantitative and qualitative aspects of sediment distribution would be recognized to play an important role for proper management in a coastal zone.In this research, some field observations below have been conducted in Joetsu-Ogata coast, Japan since 2009 in order to investigate sediment distribution in the cross-shore direction and the cross-section.1. bottom profile measurement by GPS sounder, 2. sediment sampling(on the bottom surface), 3. sampling of boring coresMain results are as follows1. only fine sand deposits offshore of the bar2. layered structure observes in some sample and the depth of the structure is around less than 1m3. coarse and very coarse sand exist in the core sample close to the shore line4. very coarse sand and clay layer in the trough. The layered structure would be the consequence of mixing process by the most recent high-wave conditions. The vertical distributions of sediment show both the qualitative information of existing sediment and the mixing history by the external forces.