摘要
本文以野外实测资料和室内分析、计算资料为基础,研究了双曲率青安湾海滩的沉积特征和地形发育,并讨论了各种因素对海滩特征的影响。认为:青安湾海滩目前遭受侵蚀后退;滩面沉积物变化与水动力强度相适应;滩面重矿物和稳定重矿物含量分布与沉积物中值粒经(φ)和分选程度成正比;滩面的侵蚀、淤积变化与滩面水动力强度的变化相关;海滩坡度的变化主要存在时间尺度和空间尺度两种形式。
This paper studied the general characteristics of the spiral beach in Qingan Bay with data of grain-size,distributions of heavy minerals,sedimentary structure,beach morphological features,beach surface changes and changing rate. The paper also discussed the influences of various factors on beach characteristics.The following conclusions were obtained.1. The beach in Qingan Bay has spiral forms both in the northern and southern bay. Erosion and retrogress in the beach will continue for a long time.2. Distribution of sediments in the beach surface is accordant with hydrodynamical strength.From sea to land the hydrodynamic turns weaker,the sediments turn finer and have better sorting.Along the net sand transportation direction,the sediments also turn finer and have better sorting.3. Percentages of heavy minerals and stable heavy minerals in the beach surface are in direct proportion to the mean diameter(φ)and sorting of the sediments.4. The changes of hydrodynamical strength in the beach surface could cause the changes in sediment gerain-size and beach morphological features.5. There are two main kinds of beach gradient changes. One is the change with the passage of time, the other is the change at different space positions.
出处
《热带海洋》
CSCD
1989年第2期75-83,共9页
