Structure-from-Motion Photogrammetry and Rare Earth Oxides can quantify diffuse and convergent soil loss and source apportionment  

作　　者：Pia Benaud Karen Anderson Mike R.James Timothy A.Quine John N.Quinton Richard E.Brazier 

机构地区：[1]CREWW,Geography,Faculty of Environment,Science and Economy,University of Exeter,Exeter,Devon,EX44RJ,United Kingdom [2]Environment and Sustainability Institute,University of Exeter,Penryn,Cornwall,TR109FE,United Kingdom [3]Lancaster Environment Centre,Lancaster University,Bailrigg,Lancaster,LA14YQ,United Kingdom [4]Geography,Faculty of Environment,Science and Economy.University of Exeter,Exeter,Devon,EX44RJ,United Kingdom

出　　处：《International Soil and Water Conservation Research》2023年第4期633-648,共16页国际水土保持研究（英文）

摘　　要：Accurately quantifying rates of soil erosion requires capturing both the volumetric nature of the visible,convergent fluvial pathways(also known as rills)and the subtle nature of the less-visible,diffuse pathways(interrill areas).The aim of this study was to use Rare Earth Oxide(REO)tracers and Structure-from-Motion(SfM)photogrammetry to elucidate retrospective information about soil erosion rates and sediment sources during different soil erosion conditions,within a controlled laboratory environment.The experimental conditions created erosion events consistent with diffuse and convergent erosion processes.REO tracers allowed the sediment transport distances of over 2 m to be described,and helped resolved the relative contribution of diffuse and convergent soil erosion;interrill areas were also iden-tified as a significant sediment sources soil loss under convergent erosion conditions.While the potential for SfM photogrammetry to resolve sub-millimetre elevations changes was demonstrated,under some conditions non-erosional changes in surface elevation,such as compaction,exceeded volumes of soil loss via diffuse erosion.The discrepancies between SfM Photogrammetry calculations and REO tagged sediment export were beneficial,identifying that during soil erosion events sediment in both aggregate and particle form is deposited within the convergent features,even when the rill extended the full length of the soil surface.The combination of SfM photogrammetry and REO tracers has provided a novel platform for building a spatial understanding of patterns of soil loss and source apportionment between rill and interrill erosion.

关 键 词：Soil erosion Structure-from-Motion Photogrammetry Rare Earth Oxides Tracers Sediment Rainfall simulator Sheetwash Rilling Interrill 

分 类 号：S157[农业科学—土壤学]