海滩均衡剖面的概念及相关问题的讨论——以日照实测海滩剖面为例  

Equilibrium Beach Profile Concept and Related Discussion: Taking the Rizhao Beach Profile as an Example

作　　者：印萍[1] 吕京福[1] 夏东兴[1] 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《黄渤海海洋》2001年第2期39-45,共7页Journal of Oceanography of Huanghai & Bohai Seas

摘　　要：海滩均衡剖面是海洋动力和海滩泥沙充分作用下的一个具有统计意义上的相对均衡的海滩形态。绝对意义上的、理想的均衡海滩剖面在自然界是难以找到的 ,而统计意义上的海滩均衡特征可以满足海岸变化和海滩过程研究需要。海滩均衡剖面的形态主要受控于国海滩泥沙的粒度特征 ,该剖面的形态指数是海滩泥沙沉降速率的函数 ,海滩粒度越粗 ,海滩坡度越陡。本文研究的日照海滩存在统计意义上的均衡剖面。由于海滩沉积物粒度具有明显的分带特征 ,海滩剖面不是一个理想的均一平面 ,而是由与海滩泥沙粒度相适应的两个均衡剖面组成。这两段海滩的表层粒径分别为 4.8Φ和 7.5Φ ,观测剖面的海滩形态指数分别为 0 .0 75和 0 .0 1 5,理论海滩形态指数分别为 0 .0 77和 0 .0 2 ,理论值和观测值有很好的一致性。The equilibrium beach profile is a statistically relative equilibrium beach shape under the interaction between marine dynamics and beach sediments. The ideal and absolute equlibrium beach profile in nature is not existent, and the statistically equilibrium beach characteristics can meet the requirements for studying the coastal changes and beach process. The shape of equilibrium beach profile depends mainly on the beach sediment grain size, and the scaling parameter is the function of beach sediment settling rate, the coarser the sediment, the steeper the beach. A statistically equilibrium beach profile was found in Rizhao, and the profile consists of two equilibrium profiles corresponding to two sedimnt grain sizes due to the zonation of grain size distribution along the beach profile. The scaling parameters of the two profiles are 0.075 and 0.015 corresponding to grain sizes of 4.8Φ and 7.5Φ, respectively. The theoretical scaling parameters are 0.077 and 0.02, respectively, so the theoretical values are well consistent with the observed ones.

关 键 词：海滩 均衡剖面 形态指数 粒径 海洋动力 泥沙 

分 类 号：P737.12[天文地球—海洋地质]