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首页> 外文期刊>Geodinamica Acta >Geodynamic processes on sandy slope gullies in central Spain field observations, methods and measurements in a singular system
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Geodynamic processes on sandy slope gullies in central Spain field observations, methods and measurements in a singular system

机译：西班牙中部沙质坡口沟壑的地球动力学过程单一系统中的观测，方法和测量

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摘要

Gullies developed on sandy lithologies are scarce and few studies have been reported on these landscapes. This paper presents an approach to study such singular landforms. The studied gullies appear on the slopes of a group of mesas and cuestas of Upper Cretaceous sediments located in the Northern piedmont of the Guadarrama Mountains, Spain. Landforms of these gullied areas were catalogued, characterized and quantified with reconnaissance methods, providing information about the most active geomorphic processes. These are being monitored in a 1.32 ha representative gullied catchment, the Barranca de los Pinos. In its high gradient slopes, where mass movements occur, high resolution topographical surveys are being carried out by Terrestrial Laser Scanning (TLS). On low gradient slopes, runoff and rain splash are being monitored in micro plots; and in the main channel, sediment transport and water discharge are being measured. This ensemble of methods, some of them novel, is providing patterns of sediment movement within the gully system, and a hypothesis of high activity rates has been confirmed. High gradient sand slopes without carbonate caprock erode fourfold compared to the capped slopes. In the low gradient slopes, those ungullied produce more runoff while exposed sands yield more sediment; sands covered by litter produce the least runoff and sediment. Notably, this catchment yields mainly bedload.
机译：在砂质岩性上发育的沟壑很稀少，关于这些景观的报道很少。本文提出了一种研究这种奇异地形的方法。所研究的沟壑出现在西班牙瓜达拉马山脉北部山麓的上白垩统沉积物的台地和洞穴的斜坡上。利用勘查方法对这些沟壑区的地貌进行分类，表征和定量，以提供有关最活跃的地貌过程的信息。在一个占地1.32公顷的集水区Barranca de los Pinos进行监测。在发生质量运动的高坡度斜坡上，正在通过陆地激光扫描（TLS）进行高分辨率地形测量。在低坡度的坡度上，径流和雨水的飞溅在微区中被监测。在主要渠道，正在测量沉积物的输送和排水。这种方法的组合（其中有些是新颖的）提供了沟渠系统内泥沙运动的模式，并且已经确认了高活动率的假设。与封盖的斜坡相比，没有碳酸盐覆盖层的高梯度砂坡侵蚀了四倍。在低坡度的坡度上，那些未受侵蚀的人产生更多的径流，而裸露的沙子产生更多的沉积物。杂物覆盖的沙子产生的径流和沉积物最少。值得注意的是，该集水区主要产生床位负荷。

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