Characteristics of Icelandic Outwash Fan
Characteristics of Icelandic Outwash Fan
复制标题
冰岛冲流扇的特点
DOI：
10.5026/jgeography.115.4_492
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发表时间：
2006
影响因子：
3.1
通讯作者：
Kyoji Saito
中科院分区：
文献类型：
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作者：
Kyoji Saito
不仅冰水扇，而且水流扇都曾被讨论过是否属于冲积扇。在这项研究中，冰岛Skeietarara冰水扇检查冲积扇的各种定义。冲积扇陡于1.5度的标准在潮湿地区是不可接受的，因为0.5至1.5度的沉积坡度之间没有间隙。在日本，平均坡度大于2%0或0.11度的平缓水流扇被认为是冲积扇;因此，根据其纵向剖面，平均坡度为3.9%0或0.22度的Skeietarara冰水扇也可以被认为是冲积扇。虽然顶点在莫萨达鲁尔山谷口周围，但它位于瓦特纳冰川的前面。因此，不能认为该扇是形成于谷口的狭义冲积扇。然而，它是一个狭义的冲积扇的可能性仍然存在，因为以下可能的事件-主要的扇体已经建立在谷口，和身体随后被修改的冰水，问题是是否发生这样的事件。
Not only outwash fans but also stream-flow fans have been discussed as to whether or not they are involved in alluvial fans. In this study the Skeiðara outwash fan in Iceland is examined by checking various definitions on alluvial fans. The criterion that alluvial fans are steeper than 1.5 degrees is not acceptable in humid regions, because there is no gap between depositional slopes ranging from 0.5 to 1.5 degrees. Gentle stream-flow fans with mean slopes steeper than 2%0 or 0.11 degrees in Japan are recognized as alluvial fans; therefore, the Skeiðara outwash fan with a mean slope of 3.9%0 or 0.22 degrees can also be regarded as an alluvial fan on the basis of its longitudinal profile. Although the apex is around the valley mouth of Morsardalur, it is at the front of the Vatna glacier. Therefore, the fan is not considered to be an alluvial fan in the narrow sense that it is formed at the valley mouth. However, the possibility of it being an alluvial fan in a narrow sense remains because of the following probable events-the main fan body had been built at the valley mouth, and the body was modified subsequently by outwash flow.The problem is whether or not such events occurred.