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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Geomorphic response of an Appalachian Valley and Ridge stream to urbanization
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Geomorphic response of an Appalachian Valley and Ridge stream to urbanization

机译：阿巴拉契亚河谷和山脊河流对城市化的地貌响应

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Human-induced changes to the channel and 18 center dot 6 km(2) catchment of Second Creek, in Knox County, Tennessee (USA), have included deliberate channel realignment, channelization of some reaches in culverts or cement-lined channels, the addition of coarse particles, and intentional and unintentional changes in catchment hydrology. Field observations and measurements made between 1997 and 2001 showed active adjustment of the stream channel. Channel bank erosion is the dominant adjustment, but aggradation also occurs. One change following urbanization is an increase in bed particle size due to the addition of particles of anthropogenic origin. Such particles constitute 2-21 per cent of particles sampled at eight sites along the stream, and their D-50 exceeds the D-50 of natural particles at five of the sites. The downstream portion of the catchment has been urbanized for more than 150 years, but urbanizing activity has continued throughout the catchment, occurring not as a discrete perturbation, but as a set of disturbances with varying spatial and temporal scales. Spatial patterns of erosion and deposition in the channel are complex and do not show an upstream-downstream trend. Effective, although unintended, decoupling of the most manipulated reaches has hindered the propagation of changes in channel morphology and channel materials in this urbanized stream system. Copyright (c) 2006 John Wiley & Sons, Ltd.
机译：在美国田纳西州诺克斯县，Second Creek的河道和18个中心点6 km（2）流域的人为变化包括故意的河道调整，涵洞或水泥衬砌的河道中某些河段的河道化，流域水文学中的粗颗粒以及有意和无意的变化。在1997年至2001年之间进行的现场观察和测量表明，河道的积极调整。渠道银行侵蚀是主要的调整措施，但也会发生加剧。城市化之后的一个变化是由于添加了人为来源的颗粒，导致床层粒径增加。此类颗粒占沿流八个位置采样的颗粒的2-21％，其D-50超过五个位置天然颗粒的D-50。流域的下游部分已进行了150多年的城市化，但是城市化活动在整个流域中一直在持续，其发生不是离散的扰动，而是一系列具有不同时空尺度的干扰。河道中侵蚀和沉积的空间格局很复杂，没有显示出上游-下游的趋势。有效的（尽管无意间）解耦的操作最广泛的河段阻碍了这种城市化河流系统中河道形态和河道物质变化的传播。版权所有（c）2006 John Wiley＆Sons，Ltd.

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