青岛汇泉湾海滩剖面变化特征

Change characters of beach profile in Huiquan Bay,Qingdao

在海滩地形测量的基础上,分析了汇泉湾前滨海滩剖面沙坝、沟槽的短时间尺度变化特征。研究结果表明,2005年3～11月,海滩剖面沙坝顸沟槽底相对高度均变小,沙坝顶部宽度出现不同程度的变宽或变窄现象;在西北侧前滨海滩上,沟槽最底部淤高0.1～0.35 m,沟槽轴线向陆移动距离较大,为17.5～3.5 m,沙坝顶部淤高0～0.2 m,沙坝顶部轴线向陆移动0～42.25 m。而东南部前滨海滩上,大部分剖面沙坝顶被削平蚀低0.1～0.2 m,沙坝顶部轴线向海移动7～23.75 m。在海滩西北部和中部的前滨海滩上,2005年11月沟槽最底部轴线到高潮线的距离为44～58 m,沙坝顶轴线到高潮线的距离为63.75～98.5 m。

On the basis of beach morphology, we analyzed the short-period characters of sand bar and sand trough of beach profiles on the foreshore beach in Huiquan Bay. From March to November in 2005, the elevation differences between sandbar crest and sand trough bottom became smaller, and the width of sandbar crest became wider or narrower differently. On the northwest foreshore, the accretion thickness of sand trough bottom varied from 0.1 m to 0.35 m, axis of the deepest part of the sand trough migrated onshore from about 3.5m to 17.5m, the accretion thickness of sandbar crest varied from 0 m to 0.2 m, and axis of the sandbar crest migrated onshore from about 0 m to 42.25 m. While on the southeast foreshore, the sandbar crest was cut and eroded from 0.1 m to 0.2 m, axis of the sandbar crest migrated offshore from about 7 m to 23.75 m. The distance from the axis of sand trough bottom to high water line varied from 44 m to 58 m, while the distance from the sandbar crest to high water line varied from 63.75 m to 98.5 m on the northwest and middle beach.