A Comparison of Past and Present Episodes of Gully Erosion at Wangrah Creek, Southern Tablelands, New South Wales
A Comparison of Past and Present Episodes of Gully Erosion at Wangrah Creek, Southern Tablelands, New South Wales
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新南威尔士州南部高地 Wangrah Creek 过去和现在沟壑侵蚀的比较
DOI：
10.1111/j.1467-8470.1991.tb00711.x
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
I. Prosser
中科院分区：
文献类型：
--
作者：
I. Prosser
旺格拉溪的侵蚀沟暴露出至少两次前冲沟侵蚀的墙壁。过去的冲沟与今天的冲沟大小相似，但在任何特定时期都没有在该地区广泛分布。过去和现在的侵蚀的原因进行检查，通过测绘点的沟的启动和比较的地貌历史与一个独立的古环境历史。过去的冲沟是内在不稳定条件的结果，可能是由于沼泽沉积物的扩张增加了径流。相比之下，目前的沟蚀是欧洲人定居造成的主要环境变化的结果，欧洲人定居对沟蚀的影响比过去1万年来任何其他环境变化都大。在Wangrah溪，冲沟形成的地点表明，目前的侵蚀是由局部扰动谷底造成的。
Erosion gullies at Wangrah Creek expose walls of at least two previous episodes of gully erosion. Past gullies were of a similar size to those of today but were not as widespread across the region at any particular time. The causes of past and present erosion are examined by mapping points of gully initiation and comparing the geomorphic history with an independent palaeo-environmental history. Past gullies were the result of intrinsically unstable conditions, possibly caused by the expansion of swampy deposits increasing runoff. In contrast, the present gully erosion is the result of major environmental change caused by European settlement, which had a greater effect on gully erosion than any other environmental change over the last 10,000 years. At Wangrah Creek, sites of gully initiation indicate that the present erosion was caused by localised disturbances to the valley floor.