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Remote sensing ***-based monitoring of agricultural terrace degradation

International Soil and Water Conservation Research 2021年第1期9卷 1-10页

作者： Anton Pijl Edoardo Quarella Teun A.Vogel Vincenzo D'Agostino Paolo Tarolli Dept.of Land EnvironmentAgriculture and ForestryUniversity of PadovaVialedell'Università1635020LegnaroPDItaly Soil Physics and Land Management Group Wageningen UniversityDroevendaalsesteeg 46708PBWageningenthe Netherlands

The degradation of agricultural terraces is considered a major challenge to soil and water conservation in steep-slope *** terracing is a widespread conservation practice,its sustainability is threatened by adverse climatic and man-made *** studies have shown the impact of terrace designs on the formation of runoff pathways,causing degradation processes on terrace platforms(*** erosion)and walls(***,landslides,collapse).This study evaluates a remote sensing versus a field-based approach to monitor hydrological processes responsible for terrace degradation,as tested in a north-Italian *** field-based approach was based on spatially measured Soil Moisture Content(SMC)using a Time Domain Reflectometry(TDR)instrument,which clearly revealed saturation hotspots around two damaged terraces in the study ***,these zones showed a particular cross-sectional SMC profile,with the highest saturation close to the terrace platform *** remote sensing approach was based on aerial imagery acquired by an Unmanned Aerial Vehicle(UAV)and photogrammetric reconstruction of the vineyard geomorphology,allowing terrain-based analysis and physical erosion *** this approach,simulations indicated that terrace damages could be partly explained by the formation of preferential runoff pathways caused by the terrace *** parallel methodology allowed a comparison of the merits and limitations of either approach,as done in light of published *** occurrence of two SMC hotspots at terrace edges(and their non-typical cross-sectional profiles)could be better understood from simulated surface flow *** the causal relationship between heterogeneous soil saturation and terrace instability has been previously reported in literature,the novelty of the presented study is the use of topsoil SMC as an indicator of potential damages,favouring the scalability compared to fixed,local and often intrusive terrace sub-sur

关键词： agricultural terraces Remote sensing UAV Soil moisture Land degradation

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