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首页> 外文期刊>Estuarine Coastal and Shelf Science >Sedimentation, elevation and marsh evolution in a southeastern Australian estuary during changing climatic conditions
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Sedimentation, elevation and marsh evolution in a southeastern Australian estuary during changing climatic conditions

机译：气候条件变化期间，澳大利亚东南部河口的沉积，海拔和沼泽演变

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Mangrove and salt marsh vertical accretion and surface elevation change was measured at Kooragang Island within the Ramsar-listed Lower Hunter estuarine wetlands in New South Wales, Australia, using surface elevation tables and marker horizons over a ten-year period. We surveyed mangrove, salt marsh and a zone of mangrove encroachment into salt marsh. The period of analysis was dominated by El Nino (drought) climatic conditions, though included a series of east coast low pressure systems and associated storms over the central coast of NSW in June 2007. The storms may have initially caused scouring of sediments in the mangrove zone, followed by significant accretion within both the mangrove and salt marsh during the six months following the storms, with most of this accretion corresponding to spring tides several months after the storms. These accretion events were not accompanied by an equivalent elevation change, and robust elevation trends over the study period in mangrove and salt marsh indicate that the storms may have had little impact on the longer-term elevation dynamics within both the mangrove and salt marsh at Kooragang Island. Elevation dynamics in these zones appear to be regulated by vertical accretion over longer time periods and modulated by hydrology at shorter temporal scales. Elevation declined in the mangrove encroachment zone despite continued vertical accretion and we propose that this discrepancy may be associated with expansion of tidal creeks near the zone of mangrove encroachment or loss of salt marsh vegetation. This pattern of encroachment is consistent with observations from sites throughout the region and may be related to climatic perturbations (El Nino Southern Oscillation) rather than directly attributed to the storms.
机译：在十年内，使用表面海拔表和标志物层位，在澳大利亚新南威尔士州拉姆萨尔群岛列出的下亨特河口湿地内的库拉岗岛，测量了红树林和盐沼的垂直吸积和表面海拔变化。我们调查了红树林，盐沼和红树林侵蚀盐沼的区域。分析期主要受厄尔尼诺（干旱）气候条件的影响，尽管包括一系列东海岸低压系统和相关的2007年6月在新南威尔士州中部海岸的暴风雨。这些暴风雨最初可能导致红树林沉积物冲刷。暴风雨后的六个月内，在红树林和盐沼中都有大量积聚，其​​中大部分积聚对应于暴风雨后几个月的春季潮汐。这些积聚事件并没有相应的海拔变化，并且在研究期间，红树林和盐沼的上升趋势强劲，这表明风暴可能对库拉岗红树林和盐沼的长期海拔变化影响不大。岛。这些区域的高程动力学似乎在较长的时间范围内受到垂直积聚的调节，而在较短的时间尺度上受到水文学的调节。尽管垂直增加，红树林侵蚀带的海拔下降了，我们认为这种差异可能与红树林侵蚀带附近的潮汐小溪的扩张或盐沼植被的丧失有关。这种侵占方式与整个区域的观测结果一致，可能与气候扰动有关（厄尔尼诺南方涛动），而不是直接归因于风暴。

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