High precision tracing of soil and sediment movement using fluorescent tracers at hillslope scale
High precision tracing of soil and sediment movement using fluorescent tracers at hillslope scale
复制标题
使用荧光示踪剂在山坡尺度上高精度追踪土壤和沉积物运动
DOI：
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发表时间：
2019
影响因子：
3.3
通讯作者：
J. Pates
中科院分区：
文献类型：
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作者：
R. Hardy;J. Quinton;M. James;P. Fiener;J. Pates
生成有关土壤侵蚀引起的沉积物运动的高分辨率空间信息仍然是一项主要的研究挑战。在本文中，我们提出了一种新的追踪方法，该方法利用 LED（发光二极管）光在沙子大小的示踪剂中诱导荧光，然后使用商用数码相机中的互补金属氧化物半导体 (CMOS) 传感器以毫米分辨率进行检测，无需去除土壤材料。首先，我们详细介绍两种互补但独立的用于量化图像中示踪剂浓度的方法：粒子计数和基于强度的方法。我们表明，这两种方法都可以在实验室条件下产生高分辨率的颗粒浓度估计值。其次，我们展示了该方法通过耕作收集土壤重新分布空间信息的能力，精度为毫米，覆盖约 50 米的山坡并沿土壤剖面垂直向下。我们的工作展示了在不干扰正在研究的土壤表面的情况下收集有关土壤运动的定量时间分辨数据的潜力，并且可以参数化或评估动态分布式土壤侵蚀模型或进行以前不可能进行的针对颗粒运动的基础研究。 © 2018 作者。地球表面过程和地貌由 John Wiley & Sons Ltd 出版。
Generating high resolution spatial information on the movement of sediment in response to soil erosion remains a major research challenge. In this paper we present a new tracing method that utilises LED (light emitting diode) light to induce fluorescence in a sand‐sized tracer, which is then detected, using a complementary metal oxide semiconductor (CMOS) sensor in a commercial digital camera, at mm‐resolution without the need for removal of soil material. First, we detail two complementary, but independent, methods for quantifying the concentration of tracer from images: particle counting and an intensity based method. We show that both methods can produce highly resolved estimates of particle concentrations under laboratory conditions. Secondly, we demonstrate the power of the method for collecting spatial information on soil redistribution by tillage, with mm precision, over an approximately 50 m hillslope and vertically down the soil profile. Our work demonstrates the potential to collect quantitative time‐resolved data about soil movement without disturbing the soil surface which is being studied, and with it the possibility to parameterise or evaluate dynamic distributed soil erosion models or to undertake fundamental research focused on particle movement that has been impossible to conduct previously. © 2018 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.