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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Waterfalls, floods and climate change: evidence from tropical Australia
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Waterfalls, floods and climate change: evidence from tropical Australia

机译：瀑布，洪水和气候变化：来自热带澳大利亚的证据

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Sediments preserved at the base of rare types of waterfalls provide records of terrestrial floods to 30 kyr or more, being approximately 6-10 times longer than that usually obtained from the traditional slackwater method. These coarse-grained sand deposits form ridges and levees adjacent to plunge pools at the foot of unindented escarpments and within gorge overflow bedrock channel systems. The extension of palaeoflood records into the Late Pleistocene allows comparisons to be made between periods of extreme floods and dramatically different climatic regimes. Our results highlight that the last 30 kyr were dominated by alternating periods of extreme and relatively low magnitude floods that correspond to particular climatic regimes. Recent predictions from Global Climate Models suggest that tropical regions will experience dramatic increases in the frequency and magnitude of extreme floods under a future altered climate. Plunge-pool palaeoflood records can be used to at least partially test such predictions by determining whether similar previous climate/flood associations have occurred within a region.
机译：保存在稀有瀑布类型底部的沉积物提供了长达30年或更长的陆地洪水记录，比传统的松散水法获得的记录长约6至10倍。这些粗粒沙沉积物形成了山脊和堤坝，这些山脊和堤坝与不凹陷的悬崖脚下和峡谷溢流基岩通道系统内的暴跌水池相邻。通过将古洪水记录扩展到晚更新世，可以在极端洪水时期和截然不同的气候状况之间进行比较。我们的结果表明，最后30年的干旱主要是交替发生的极端洪水和相对较低震级的洪水，这些时期与特定的气候状况相对应。全球气候模式的最新预测表明，在未来气候变化的情况下，热带地区的极端洪水的频率和强度将急剧增加。通过确定某个区域内是否已经发生过类似的先前气候/洪水关联，可将柱塞池古洪水记录至少部分地用于检验此类预测。

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