Geomorphic and vegetative characteristics along three northern Virginia streams
Geomorphic and vegetative characteristics along three northern Virginia streams
复制标题
弗吉尼亚州北部三条溪流沿线的地貌和植物特征
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
C. Hupp
中科院分区：
文献类型：
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作者：
W. Osterkamp;C. Hupp
几何形状，沉积物和树木植被数据收集的洼地地貌表面在山谷部分沿着三个计量常年流的北方弗吉尼亚州。河流流域的地形和自然地理差异很大;平均流量从0.196到323立方米每秒不等。普遍的表面确定的沉积酒吧，活跃的渠道货架，河漫滩，和阶地。对应于活跃通道架水平的阶段相当于5%至13%的流动持续时间。对应于洪泛区水平的阶段相当于1.4至2.0年复发间隔的排放量。流量数据和统计测试的地貌表面，沉积物和植被数据表明，各种冲积功能的形成和维护水力控制分选过程。对木本植物和地貌数据的分析表明，每个表面都有特征物种，其中一些几乎是一个表面所独有的。沉积物类型与物种分布的相关性低于地貌面与物种分布的相关性。据推断，植物分布在很大程度上是由流量的频率和强度控制，植物可能有助于确定地貌水平和洪水破坏的潜力。
Geometry, sediment, and woody-vegetation data were collected from bottomland geomorphic surfaces at valley sections along three gaged perennial streams of northern Virginia. The basins of the streams differ widely in topography and physiography; mean discharges vary from 0.196 to 323 m3 per sec. Prevalent surfaces identified were the depositional bar, the active-channel shelf, the flood plain, and terraces. The stages corresponding to active-channel-shelf levels were equivalent to flow durations of 5% to 13%. Stages corresponding to flood-plain levels were equivalent to discharges with 1.4- to 2.0-yr recurrence intervals. The discharge data and statistical tests of geomorphicsurface, sediment, and vegetative data suggest that the various alluvial features are formed and maintained by hydraulically controlled sorting processes. Analysis of woody-plant and geomorphic data shows that each surface supports characteristic species, some of which are nearly unique to a surface. Tests of sediment type with species distribution showed lower correlation than that of geomorphic surface with species. It is inferred that plant distributions largely are controlled by flow frequency and intensity, and that plants may help to identify geomorphic levels and potential for flood damage.