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Considering lacustrine erosion records and the De Ploey erosion model in an examination of mountain catchment erosion susceptibility and precipitation reconstruction
Catena ( IF 5.4 ) Pub Date : 2019-12-16 , DOI: 10.1016/j.catena.2019.104278
Deonie Allen , Anaëlle Simonneau , Gaël Le Roux , Florence Mazier , Laurent Marquer , Didier Galop , Stéphane Binet

Reconstruction of paleo-precipitation can provide an insight into past climate and precipitation. De Ploey et al. (1995) presents a highly simplified erosion equation to consider precipitation and erosion susceptibility. This empirical model allows estimation of total precipitation and erosion susceptibility across a range of catchment characteristics (including catchment area, slope, elevation, vegetation cover) and when limited catchment or meteorological data is available. The presented study tests the De Ploey equation using dated lacustrine records of catchment soil deposition both spatially and temporally. The objective is to examine the De Ploey equation’s ability and efficiency in reconstructing past long-term precipitation using sedimentological parameters. The erosion susceptibility factor is described as a ‘black box’ value by De Ploey et al. (1995). This research unravels the erosion susceptibility variable, identifying it to change spatially and temporally according to precipitation, vegetation cover and composition (the extent of tree establishment across the catchment), total lacustrine deposition and geochemical signatures in the archive. Calculation of the erosion sustainability variable and it’s use within the De Ploey erosion equation illustrate a reconstruction of an indicative mean annual precipitation and erosion susceptibility change over the recent period (∼100 years).



中文翻译:

在检查山区集水区侵蚀敏感性和降水重建时考虑湖侵蚀记录和De Ploey侵蚀模型

重建古降水可以洞悉过去的气候和降水。De Ploey等。(1995)提出了一个高度简化的侵蚀方程来考虑降水和侵蚀敏感性。这种经验模型可以估算出一系列集水特征(包括集水面积,坡度,海拔,植被覆盖度)以及有限的集水量或气象数据时的总降水量和侵蚀敏感性。提出的研究使用过时的湖水记录在时空上对流域土壤沉积进行了测试,测试了De Ploey方程。目的是研究De Ploey方程使用沉积学参数重建过去长期降水的能力和效率。腐蚀敏感性系数由De Ploey等人描述为“黑匣子”值。(1995)。这项研究揭示了土壤侵蚀敏感性变量,确定其根据降水量,植被覆盖度和组成(集水区树木形成的程度),湖泊中的总湖泊沉积和地球化学特征而在空间和时间上发生变化。侵蚀可持续性变量的计算及其在De Ploey侵蚀方程中的使用说明了最近一段时间(约100年)的指示性年平均降水量和侵蚀敏感性变化的重建。植被中的植被覆盖度和组成(流域树木的形成程度),湖泊中的总湖泊沉积和地球化学特征。侵蚀可持续性变量的计算及其在De Ploey侵蚀方程中的使用说明了最近一段时间(约100年)的指示性年平均降水量和侵蚀敏感性变化的重建。植被中的植被覆盖度和组成(流域内树木的形成程度),湖泊中的总湖泊沉积和地球化学特征。侵蚀可持续性变量的计算及其在De Ploey侵蚀方程中的使用说明了最近一段时间(约100年)的指示性年平均降水量和侵蚀敏感性变化的重建。

更新日期:2019-12-17
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