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首页> 外文期刊>Earth Surface Dynamics Discussions >Autogenic versus allogenic controls on the evolution of a coupled fluvial megafan–mountainous catchment system: numerical modelling and comparison with the Lannemezan megafan system (northern Pyrenees, France)
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Autogenic versus allogenic controls on the evolution of a coupled fluvial megafan–mountainous catchment system: numerical modelling and comparison with the Lannemezan megafan system (northern Pyrenees, France)

机译：河流巨扇-山区流域耦合系统演化的自生与异源控制：数值模拟和与兰内梅赞巨扇系统的比较（法国北比利牛斯）

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摘要

Alluvial megafans are sensitive recorders of landscape evolution, controlled by both autogenic processes and allogenic forcing, and they are influenced by the coupled dynamics of the fan with its mountainous catchment. The Lannemezan megafan in the northern Pyrenean foreland was abandoned by its mountainous feeder stream during the Quaternary and subsequently incised, leaving a flight of alluvial terraces along the stream network. We use numerical models to explore the relative roles of autogenic processes and external forcing in the building, abandonment and incision of a foreland megafan, and we compare the results with the inferred evolution of the Lannemezan megafan. Autogenic processes are sufficient to explain the building of a megafan and the long-term entrenchment of its feeding river on time and space scales that match the Lannemezan setting. Climate, through temporal variations in precipitation rate, may have played a role in the episodic pattern of incision on a shorter timescale. In contrast, base-level changes, tectonic activity in the mountain range or tilting of the foreland through flexural isostatic rebound do not appear to have played a role in the abandonment of the megafan.
机译：冲积巨扇是景观演变的敏感记录者，受自生过程和异源强迫共同控制，并且受到扇形及其山区流域耦合动力学的影响。在第四纪期间，比利牛斯山前陆的Lannemezan巨扇被山上的支流河抛弃，随后被切开，沿河网留下了一些冲积阶地。我们使用数值模型来探索自生过程和外部强迫在前陆巨型扇的建造，遗弃和切开中的相对作用，并将结果与​​兰内梅赞巨型扇的推断演变进行比较。自生过程足以解释巨型风扇的建造以及其喂食河在与Lannemezan环境相匹配的时间和空间尺度上的长期根深蒂固。由于降水速率的时间变化，气候可能在更短的时间尺度上影响了切口的情节模式。相比之下，基层的变化，山脉的构造活动或通过弯曲等静压反弹引起的前陆倾斜似乎并未对巨型扇的抛弃产生影响。

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