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首页> 外文期刊>Journal of the American Water Resources Association >Characterizing Geomorphic Change from Anthropogenic Disturbances to Inform Restoration in the Upper Cache River, Illinois
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Characterizing Geomorphic Change from Anthropogenic Disturbances to Inform Restoration in the Upper Cache River, Illinois

机译：在伊利诺伊州上卡弗里弗河上描述从人为干扰到信息恢复的地貌变化

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摘要

Over the past century, channelization, agricultural tiling, and land use changes have resulted in significant stream channel degradation of the Cache River in southern Illinois. With the increasing interest in restoration of the watershed's bottomland forests and swamps, we sought to characterize geomorphic change over the past 110years to inform restoration and management. A previously surveyed stretch of river was resurveyed in the fall of 2011, following a record flood in the spring of that year. Results suggest that the slope of the channel in this section of the river has increased 345% between 1903 and 1972 (p<0.01), but has not changed significantly since (p=0.12). Within that same time period, bank heights increased between 1 and 7m and bed elevation decreased between 1 and 5m. Changes in resurveyed cross sections appear to be primarily due to recent flood scour. It appears as though early 20th Century stream channel modifications had immediate effects on the geomorphology of the channel; however, channel geometry is now at or near equilibrium. This case study of the Cache River watershed demonstrates how and why successful restoration will require integration of geomorphic processes of the system.
机译：在过去的一个世纪中，渠道化，农业拼贴和土地用途的变化已导致伊利诺伊州南部的卡什河的河道显着退化。随着人们对流域底栖森林和沼泽地恢复的兴趣日益浓厚，我们试图描绘过去110年间的地貌变化特征，以期为恢复和管理提供依据。在那年春天发生了创纪录的洪水之后，于2011年秋季对先前调查过的那条河进行了重新调查。结果表明，这条河段的河道坡度在1903年至1972年之间增加了345％（p <0.01），但此后没有明显变化（p = 0.12）。在同一时间段内，堤岸高度在1至7m之间增加，床高在1至5m之间减小。重新测量的横截面变化似乎主要是由于最近的洪水冲刷。好像20世纪初期的河道改造对河道的地貌有直接影响。但是，通道的几何形状现在处于或接近平衡状态。喀什河分水岭的这一案例研究说明了如何以及为什么成功进行恢复将需要整合系统的地貌过程。

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