The Geomorphic Significance of Log Steps in Forest Streams1
The Geomorphic Significance of Log Steps in Forest Streams1
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森林溪流中原木台阶的地貌意义1
DOI：
10.1111/j.1467-8306.1982.tb01386.x
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
R. Marston
中科院分区：
文献类型：
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作者：
R. Marston
通过对俄勒冈州中部海岸山脉163公里溪流的实地调查，提供了森林溪流中原木台阶的功能性描述。自然的树倒，而不是造林活动，占大多数的日志步骤。在低流量条件下，对数阶跃对潜在水流能量的耗散为6%，约等于福尔斯的耗散。有没有统计学上的显着差异，研究流域与对比造林和自然流输入的大型木质残体之间的日志步骤的空间分布。然而，显着的空间差异之间的流的各种订单，一个发现，指向通道冲洗能力和流相邻的地形为主导控制日志步骤的发展。应用热力学原理于水系表明，无论是福尔斯还是对数阶跃都不会导致水系平衡条件的统计显著差异。沉积物的体积...
Abstract A functional account of log steps in forest streams is provided by field surveys of 163 kilometers of streams in the central Oregon Coast Range. Natural treefall, rather than silvicultural activities, accounts for the majority of log steps. During low-flow conditions, dissipation of potential stream energy by log steps amounts to 6 percent, approximately equal to that by falls. There are no statistically significant differences regarding spatial distribution of log steps between study basins with contrasting silvicultural and natural stream inputs of large woody debris. However, significant spatial differences are revealed between streams of various orders, a finding that points to channel flushing capacity and stream-adjacent topography as dominant controls on log step development. Application of thermodynamic principles to stream systems demonstrates that neither falls nor log steps cause a statistically significant difference in equilibrium conditions of stream networks. The volume of sediment...