The Evolution of Peat‐Swamp Channels and Organic Floodplains, Barrington Tops, New South Wales, Australia
The Evolution of Peat‐Swamp Channels and Organic Floodplains, Barrington Tops, New South Wales, Australia
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泥炭沼泽河道和有机洪泛区的演变，巴林顿托普斯，新南威尔士州，澳大利亚
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发表时间：
2009
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通讯作者：
R. Nanson
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作者：
R. Nanson
地貌学，地质年代学和孢粉学被用来评估巴灵顿托普斯高原上的两个沟道沼泽的发展和稳定性。虽然这两个沼泽开始泥炭积累之前约4000大卡BP，新的地层数据表明切口之间的700和1000大卡BP，在响应区域气候变化。两个广泛的地层单位，确定在每个沼泽：上河漫滩，完全由泥炭，和插入河漫滩，下覆层间泥炭和河流沉积物。切割后，快速垂直增长的插入河漫滩发生在巴林顿河之间的690和620 cal BP，和孢粉学数据表明，从更饱和的前切口沼泽植物群的变化，不饱和的后切口沼泽植物群。一年中多次达到的满岸水位高度，沿每个沼泽河道的长度沿着是非常一致的。它的海拔控制着沼泽的整体海拔，通过控制地下水位的高度，从而控制沼泽植被的生长和泥炭的形成。特别是，当代渠道尺寸控制的增长和插入洪泛区的高度，一个过程，导致形成一个有机洪泛区以前没有描述的地貌文献。
Geomorphology, geochronology and palynology are used to assess the development and stability of two channelled swamps on the Barrington Tops plateau. While both swamps commenced peat accumulation prior to about 4000 cal BP, new stratigraphic data indicate incision between 700 and 1000 cal BP, in response to regional climate change. Two broad stratigraphic units are identified in each swamp: the upper floodplain, comprised entirely of peat, and the inset floodplain, underlain by interbedded peat and fluvial sediments. Following incision, rapid vertical growth of the inset floodplain occurred on the Barrington River between 690 and 620 cal BP, and palynological data indicate a change from more saturated pre-incision swamp flora to less saturated post-incision swamp flora. Bankfull stage-height, achieved many times in a year, is remarkably consistent along the length of each swamp channel. Its elevation controls the overall elevation of the swamps by controlling the height of the water-table and hence the growth of swamp vegetation and formation of peat. In particular, contemporary channel dimensions control the growth and height of the inset floodplain, a process that results in the formation of an organic floodplain not previously described in the geomorphic literature.