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首页> 外文期刊>Journal of geophysical research. Earth Surface: JGR >Development and response of a coupled catchment fan system under changing tectonic and climatic forcing
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Development and response of a coupled catchment fan system under changing tectonic and climatic forcing

机译:构造和气候强迫变化下集水扇耦合系统的发展与响应

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Sediment fans are a potentially useful and underexploited recorder of Earth's climatic and tectonic history, but historical observations have led to conflicting views on the importance of tectonic, climatic, and lithologic variables in controlling fan morphology and deposition. A one-dimensional model of a sediment fan and its associated catchment is used to explore the sensitivity of such simple sediment routing systems to perturbations in fault slip and precipitation rates. A transport-limited catchment is coupled to a fan whose surface slope is set by the balance between catchment sediment efflux and the available tectonically generated basin accommodation. Rock uplift rate is spatially variable across the model space. Increasing the fault slip rate, or decreasing the precipitation rate, leads to an increase in fan slope, temporary back-stepping of the fan toe, and a pronounced angular unconformity. Conversely, a decrease in slip rate, or an increase in precipitation rate, results in a decrease in fan slope, and progradation and eventual stabilization of the fan toe. Once perturbed, the system evolves toward a new equilibrium state with time constants of ~0.5 to 2 Myr; these response times are insensitive to slip rate but are strongly dependent on precipitation rate. Variations in fan slope are well described by a dimensionless parameter that expresses equilibrium slope as a function of slip rate, precipitation rate, system size, and catchment lithology. This parameter holds promise as a predictive tool in inverting the morphology of natural fans for environmental variables.
机译:沉积扇是地球气候和构造历史的潜在有用且开发不足的记录器,但是历史观察导致人们对构造,气候和岩性变量在控制扇形和沉积中的重要性的看法不一致。使用一维泥沙扇及其相关集水区的一维模型来研究这种简单的泥沙路由系统对断层滑移和降水速率扰动的敏感性。受运输限制的集水区与一个风扇相连,该风扇的表面斜率由集水区泥沙外排量与可用构造构造的盆地容纳量之间的平衡来设定。整个模型空间中岩石的上升速率在空间上是可变的。增加断层滑动率或减少降水率会导致风扇斜率增加,风扇脚趾的暂时后退以及明显的角度不整合。相反,滑移率的降低或降水率的增加会导致风扇斜率减小,并导致风扇趾的增长和最终的稳定。一旦受到干扰,系统便会以约0.5到2 Myr的时间常数向新的平衡状态发展。这些响应时间对滑移率不敏感,但在很大程度上取决于降水率。风扇坡度的变化可以通过无量纲参数很好地描述,该参数将平衡坡度表示为滑移率,降水率,系统大小和集水岩性的函数。该参数有望将预测自然变量的形态转化为环境变量。

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