A Grain Size Analysis of Longshore-Bars and Troughs, Lake Superior, Ontario
A Grain Size Analysis of Longshore-Bars and Troughs, Lake Superior, Ontario
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安大略省苏必利尔湖沿岸坝和槽的粒度分析
DOI：
10.1306/74d71e1f-2b21-11d7-8648000102c1865d
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发表时间：
1969
影响因子：
2
通讯作者：
J. S. Mothersill
中科院分区：
文献类型：
--
作者：
J. S. Mothersill
对安大略上级湖Batchawana湾和Pancake湾沿沿着湖架的沿岸沙坝和槽轴的186个样品的粒度分析表明，沿岸沙坝砂比邻近的岸边沿岸槽砂分选更好，粒度更细。此外，长滨沙坝砂是单峰的，倾向于正“偏斜”，而长滨槽砂可能是单峰或双峰的，并显示出负偏斜的趋势。这表明，沿岸槽是由破碎波的作用形成的，破碎波优先使细粒颗粒运动。这些较细颗粒的颗粒被回流移向湖泊，形成了沿岸沙洲区。
Grain size analyses of 186 samples from the axes of longshore-bars and troughs along the lake shelf at Batchawana Bay and Pancake Bay, Lake Superior, Ontario, show the longshore-bar sands to be better sorted and finer grained than the adjacent shoreward longshore-trough sands. In addition the longshore-bar sands are unimodal and tend to be positively "skewed" whereas the longshore-trough sands may be either unimodal or bimodal and show a tendency towards negative skewness. This would suggest that the longshore-troughs were formed by the action of breaking waves that preferentially set the finer grained particles into motion. These finer grained particles were then moved lakeward by the undertow to form the longshore-bar areas.