Obtaining morphometric variables from gullies using two methods of interpolation laser scanner data:the case study of Vassouras,Brazil  

作　　者：OLIVEIRA Carlos Magno Moreira de FRANCELINO Márcio Rocha MENDONCA Bruno Araujo Furtado de RAMOS Isabela Queiroz 

机构地区：[1]Instituto Federal do Norte de Minas Gerais-Campus Arinos,Rodovia MG 202,Km 407 s/n,Zona Rural,Arinos-MG,38680-000,Brazil [2]Departamento de Solos,Universidade Federal de Vigosa,Av.Peter Henry Rolfs,s/n-Campus Universitario,Viqosa-MG,36570-900,Brazil [3]Departamento de Silvicultura,Universidade Federal Rural do Rio de Janeiro,BR 465 Km 07,Seropedica-RJ,23890-000,Brazil [4]Instituto do Meio Ambiente e dos Recursos Hidricos do Distrito Federal,SEPN 511,Bloco C,70750-543,Brasilia,DF,Brazil

出　　处：《Journal of Mountain Science》2020年第12期3012-3023,共12页山地科学学报（英文）

基　　金：the FAPERJ for the concession scholarships for the first author (Grants No. E26/101.897/2010 - 63010);funded by the Pró-Equipamentos program for Capes (Coordenacao de Aperfeicoamento de Pessoal de Nível Superior)。

摘　　要：Gully erosion is a worldwide problem of land degradation and water quality,and it is also frequent in Brazil.Typically,anthropic influence is the major driver of gully evolution.To study and monitor gullies it is necessary to use specific instruments and methods to obtain accurate information.The objective of this study was to use Terrestrial Laser Scanning(TLS) to create digital elevation model(DEM) accurately and define morphometric variables that characterize gullies in a mountainous relief.Two different interpolations were evaluated using the Topogrid and GridSurfaceCreate algorithms to elaborate DEM.Topographic profile for gullies was used to assess modeling quality.The DEM of the Gully 1(G1) from the Topogrid algorithm estimated soil loss of 49%,whereas the GridSurfaceCreate algorithm estimated a soil loss of97%,in a period of 1 year.The estimated soil loss for the Gully 2(G2) was 14% from the Topogrid,and 8%from the GridSurfaceCreate algorithm.The GridSurfaceCreate algorithm underestimated the volume to area ratio for G2 due to a failure on interpolating a region of low point representativity.The Topogrid algorithm represented better the terrain irregularities,as observed through the topographic profiles traced in three regions of G1 and G2.Statistical analysis showed that the GridSurfaceCreate algorithm presented lower accuracy in estimating elevations.The underestimation trend of this algorithm was also observed in G2.The gullies showed considerable soil losses,which may reduce the areas suitable for agricultural activities,and silting up of water courses.The Topogrid algorithm presented satisfactory results,denoting great potential to produce morphometric data of gullies.

关 键 词：Erosion process Interpolation algorithms Spatial statistics Digital Elevation Model Topographic profile 

分 类 号：S157[农业科学—土壤学]