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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Geomorphic changes upstream of beaver dams in Bridge Creek, an incised stream channel in the interior Columbia River basin, eastern Oregon
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Geomorphic changes upstream of beaver dams in Bridge Creek, an incised stream channel in the interior Columbia River basin, eastern Oregon

机译：俄勒冈州东部哥伦比亚河盆地内部的一条切入河道布里奇克里克（Bridge Creek）海狸水坝上游的地貌变化

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Channel incision is a widespread phenomenon throughout the dry interior Columbia River basin and other semi-arid regions of the world, which degrades stream habitat by fundamentally altering natural ecological, geomorphological and hydrological processes. We examined the extent of localized aggradation behind beaver dams on an incised stream in the interior Columbia River basin to assess the potential for using beaver, Castor canadensis, dams to restore such channels, and the effect of the aggradation on riparian habitat. We estimated aggradation rates behind 13 beaver dams between 1 and 6 years old on Bridge Creek, a tributary to the John Day River in eastern Oregon. Vertical aggradation rates are initially rapid, as high as 0.47 m yr(-1), as the entrenched channel fills, then level off to 0.075 m yr(-1) by year six, as the sediment begins accumulating on adjacent terraces. We found that a 0.5 m elevation contour above the stream channel approximately coincided with the extent of new riparian vegetation establishment. Therefore, we compared the area surrounding reaches upstream of beaver dams that were within 0.5 m elevation of the stream channel with adjacent reaches where no dams existed. We found that there was five times more area within 0.5 m elevation of the channel upstream of beaver dams, presumably because sediment accumulation had aggraded the channel. Our results suggest that restoration strategies that encourage the recolonization of streams by beaver can rapidly expand riparian habitat along incised streams. Copyright (c) 2007 John Wiley & Sons, Ltd.
机译：河道切口是在整个干燥的哥伦比亚河流域和世界其他半干旱地区的普遍现象，它通过从根本上改变自然的生态，地貌和水文过程，使河流的生境退化。我们研究了哥伦比亚河内流域内一条切割河流上的海狸大坝后面的局部聚集程度，以评估使用海狸，加拿大蓖麻，大坝恢复此类渠道的潜力，以及该聚集对河岸生境的影响。我们估计了俄勒冈州东部约翰代河的支流Bridge Creek上1至6年间的13个海狸水坝背后的蓄水速度。垂直凝结速率最初是很快的，当根深蒂固的河道被填满时高达0.47 m yr（-1），然后到第六年稳定在0.075 m yr（-1），因为沉积物开始在相邻阶地上堆积。我们发现，河道上方0.5 m的高程轮廓与新的河岸植被建立的范围大致相符。因此，我们将河道水坝高程0.5 m以内的海狸大坝上游河段周围的区域与不存在大坝的相邻河段进行了比较。我们发现，在河狸坝上游0.5 m处的河道内，面积增加了5倍，大概是因为沉积物的堆积使河道大为淤积。我们的结果表明，通过海狸鼓励溪流重新定殖的恢复策略可以沿切开的溪流迅速扩展河岸生境。版权所有（c）2007 John Wiley＆Sons，Ltd.

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