Geomorphic and vegetative recovery processes along modified Tennessee streams: an interdisciplinary approach to distributed fluvial systems
Geomorphic and vegetative recovery processes along modified Tennessee streams: an interdisciplinary approach to distributed fluvial systems
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发表时间：
1987
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通讯作者：
A. Simon;C. Hupp
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作者：
A. Simon;C. Hupp
自世纪之交以来，为了减少洪水的震级和频率，对欧比恩-分叉鹿河流域的沙床河道进行了周期性的疏浚和理直。河床、河岸和洪泛平原随着时间和空间的变化系统地调整着它们的形态和植被模式，以响应最近一次重大河道改造（1959- 1973）。向前推进的退化使黄土衍生的河岸变高变陡，并通过大量的浪费过程导致河道加宽（高达1-4百万年）。随着时间的推移，淤积降低了河岸高度，持续的大规模破坏降低了河岸的角度，导致低岸表面稳定并重新生长。河岸物种表现了河道调整的不同阶段，并与特定的地貌过程有关。通过排序技术，物种存在数据支持了预先描述的六阶段河道演化模型。
The sand-bed stream channels of the Obion- Forked Deer River basin periodically have been dredged and straightened since the turn of the century to reduce flood magnitude and frequency. Channel bed, banks, and flood plains are systematically adjusting their form and vegetative patterns over time and space in response to the latest episode of major channel modifications (1959- 1973). Headward-progressing degradation heightens and steepens the loess-derived banks and causes channel widening (up to 1-4 m year-I) by mass-wasting processes. With time, aggradation reduces bank heights and continued mass failures reduce bank angles causing low-bank sur- faces to stabilize and become revegetated. Riparian species characterize various stages of channel adjustment and are associated with specific geomorphic processes. Through ordination techniques, a predescribed six-stage model of channel evolution is supported by species pres- ence data.