Landscape evolution constrained by the intraplate stress field: Direct coupling oftectonics and the influence of biota on long-term geomorphic development in the ChileanCoastal Ranges

智利海岸山脉地形中的坡度和海拔之间的关系从北到南有系统地变化，可以用生物群的影响来解释，因为它与侵蚀是观测到的植被坡度的函数是一致的。因此，该区域提供了一个独特的机会来研究如何为生物群调整景观演变模型。对于该项目，计划使用由奥地利的PIS开发的一个数值模型，该模型允许在机械耦合、可变形的网格上模拟地表过程。在这个模型中，我们将使用智利海岸山脉的板内应力场及其自中新世以来的演化作为边界条件来描述岩石隆起。然后，我们的代码的地表过程模型将根据观测到的植被坡度进行调制，直到再现观测到的地表隆起和坡度-高程分布。该项目的成果将是一种量化工具(生物群调节的侵蚀规律)，它描述了生物群和构造对地表过程模型中侵蚀过程的相对重要性。该项目是EarthShape(第2阶段，第5组)的一个受邀的(奥地利)补充项目，因为：(A)方案组合中没有使用智利板内应力场，(B)德国没有提供这里使用的数字代码，以及(C)解决了对优先方案至关重要的问题。该项目为期一年，将向运行时间长得多的整个EarthShape项目提供结果。

The relationship between slope and elevation in the topography of the Chilean Coastal Ranges changes systematically from north to south and may be interpreted in terms of the influence of biota because it is consistent with erosion being a function of the observed vegetation gradient. The region presents therefore a unique opportunity to investigate how landscape evolution models can be modulated for biota. For the project it is planned to use a numerical model developed by PIs in Austria that allows the modelling of surface processes on a mechanically coupled, deformable grid. Within this model we will use the well-constrained intraplate stress field of the Chilean Coastal Ranges and its evolution since the Miocene as boundary conditions to describe rock uplift. The surface process model of our code will then be modulated for the observed vegetation gradient until the observed surface uplift and slope-elevation distributions are reproduced. The result of the project will be a quantitative tool (a biota-modulated erosion law) which describes the relative importance of biota and tectonics on erosion processes in surface process models. The project is an invited (Austrian) addition to EarthShape (Phase 2, cluster 5) because: (a) the use of the Chilean intraplate stress field is missing in the programme portfolio, (b) the numerical code used herein is not available in Germany and (c) the question tackled crucial to the priority programme. The project is laid out for the duration of one year and will provide its results to the substantially longer running overall EarthShape project.