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Evaluating the Erosion Process from a Single-Stripe Laser-Scanned Topography: A Laboratory Case Study

Department of Soil and Water Conservation, National Chung Hsing University, Taichung 402, Taiwan
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Water 2018, 10(7), 956; https://doi.org/10.3390/w10070956
Received: 30 May 2018 / Revised: 6 July 2018 / Accepted: 17 July 2018 / Published: 19 July 2018
(This article belongs to the Special Issue Modeling and Practice of Erosion and Sediment Transport under Change)
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Abstract

Topographies during the erosion process obtained from the single-stripe laser-scanning method may provide an accurate, but affordable, soil loss estimation based on high-precision digital elevation model (DEM) data. In this study, we used laboratory erosion experiments with a sloping flume, a rainfall simulator, and a stripe laser apparatus to evaluate topographic changes of soil surface and the erosion process. In the experiments, six slope gradients of the flume (5° to 30° with an increment of 5°) were used and the rainfall simulator generated a 30-min rainfall with the kinetic energy equivalent to 80 mm/h on average. The laser-scanned topography and sediment yield were collected every 5 min in each test. The difference between the DEMs from laser scans of different time steps was used to obtain the eroded soil volumes and the corresponding estimates of soil loss in mass. The results suggest that the collected sediment yield and eroded soil volume increased with rainfall duration and slope, and quantified equations are proposed for soil loss prediction using rainfall duration and slope. This study shows the applicability of the stripe laser-scanning method in soil loss prediction and erosion evaluation in a laboratory case study. View Full-Text
Keywords: soil erosion; rill development; erosion topography; sloping flume experiments soil erosion; rill development; erosion topography; sloping flume experiments
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Wang, Y.-C.; Lai, C.-C. Evaluating the Erosion Process from a Single-Stripe Laser-Scanned Topography: A Laboratory Case Study. Water 2018, 10, 956.

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