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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Soil production and hillslope transport in mid-latitudes during the last glacial-interglacial cycle: a combined data and modelling approach in northern Ardennes
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Soil production and hillslope transport in mid-latitudes during the last glacial-interglacial cycle: a combined data and modelling approach in northern Ardennes

机译：最后一次冰川-冰川间周期中纬度地区的土壤生产和坡地运输：北部阿登省的数据和模拟方法相结合

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The relative efficiency of various hillslope processes through Quaternary glacial-interglacial cycles in the mid-latitudes is not yet well constrained. Based on a unique set of topographic and soil thickness data in the Ardennes (Belgium), we combine the new CLICHE model of climate-dependent hillslope evolution with an inversion algorithm in order to get deeper insight into the ways and timing of hillslope dynamics under one such climatic cycle. We simulate the evolution of a synthetic hill reproducing the slope, curvature, and contributing area distributions of the hillslopes of a similar to 2500km(2) real area under a simple two-stage 120-kyr-long climatic scenario with linear transitions between cold and warm stages. The inversion method samples a misfit function in the model parameter space, based on estimates of the fit of topographic derivative distributions in classes of soil thickness and of the relative frequencies of the predicted soil thickness classes. Though the inversion results show remarkable convergence patterns for most parameters, no unique solution emerges. We obtain five clusters of good fits, whose centroids are taken as acceptable model solutions. Based on the predicted time series of average denudation rate and soil thickness, plus snapshots of the soil distribution at characteristic times, we discuss these solutions and, comparing them with independent data not involved in the misfit function, we identify the most realistic scenario. Beyond providing first-order estimates of several parameters that compare well with published data, our results show that denudation rates increase dramatically for a short time at both warm-cold and cold-warm transitions, when the mean annual temperature passes through the [0, -5 degrees C] range. We also point to the overwhelming importance of solifluction in shaping hillslopes and transporting soil, and the role of depth-dependent creep (including frost creep) throughout the climatic cycle, whereas the contributions of simple creep and overland flow are minor. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：在中纬度地区通过第四纪冰川-冰川间的循环，各种山坡过程的相对效率尚未得到很好的约束。基于阿登（比利时）的一组独特的地形和土壤厚度数据，我们将气候相关的山坡演化的新CLICHE模型与反演算法相结合，以便更深入地了解在一个条件下山坡动力学的方式和时间这样的气候周期。我们模拟了一个合成山丘的演化过程，该山丘在一个简单的两阶段120千瓦长气候情景下，在冷态和冷态之间具有线性过渡，再现了类似于2500 km（2）实际面积的山坡的坡度，曲率和贡献面积分布。温暖的阶段。反演方法基于对土壤厚度类别中的地形导数分布的拟合估计以及预测的土壤厚度类别的相对频率的估计，在模型参数空间中采样失配函数。尽管反演结果显示了大多数参数的显着收敛模式，但并没有出现唯一的解决方案。我们获得了五个良好拟合的类，它们的质心被视为可接受的模型解。基于平均剥蚀率和土壤厚度的预测时间序列，以及特征时间土壤分布的快照，我们讨论这些解决方案，并将它们与不适合函数的独立数据进行比较，从而确定最现实的情况。除了提供与公开数据比较的几个参数的一阶估算值之外，我们的结果还显示，当年平均温度超过[0， -5摄氏度]范围。我们还指出了固溶作用在塑造山坡和运输土壤中的压倒性的重要性，以及在整个气候周期中依赖深度的蠕变（包括霜冻蠕变）的作用，而简单蠕变和陆上径流的贡献很小。版权所有（c）2016 John Wiley＆Sons，Ltd.

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