Hillslopes record the growth and decay of landscapes.
Hillslopes record the growth and decay of landscapes.
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山坡记录着景观的生长和衰败。
DOI：
10.1126/science.1241791
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Hurst MD
中科院分区：
文献类型：
--
作者：
Hurst MD
地球表面记录了构造和侵蚀的综合历史，这些历史往往使地貌变得粗糙，而沉积物的输送和沉积则使地貌变得光滑。我们分析了美国加利福尼亚州构造活跃的龙背压山脊的山坡形态，以评估是否可以使用景观中山坡特征的可测量属性来重建构造隆升历史。山顶曲率和山坡浮雕镜测量了由构造强迫引起的垂直位移速率，它们的关系与将山坡传输理想化为非线性扩散过程时所预期的一致。山顶曲率对不断变化的侵蚀率的响应滞后于地形，从而可以将生长的景观与腐烂的景观区分开来。数值模型表明，山坡形态可用于推断构造速率的变化。
Earth's surface archives the combined history of tectonics and erosion, which tend to roughen landscapes, and sediment transport and deposition, which smooth them. We analyzed hillslope morphology in the tectonically active Dragon’s Back Pressure Ridge in California, United States, to assess whether tectonic uplift history can be reconstructed using measurable attributes of hillslope features within landscapes. Hilltop curvature and hillslope relief mirror measured rates of vertical displacement caused by tectonic forcing, and their relationships are consistent with those expected when idealizing hillslope transport as a nonlinear diffusion process. Hilltop curvature lags behind relief in its response to changing erosion rates, allowing growing landscapes to be distinguished from decaying landscapes. Numerical modeling demonstrates that hillslope morphology may be used to infer changes in tectonic rates.