ISWC OpenIR  > 水保所知识产出(1956-2013)
不同分辨率DEM 提取切沟形态特征参数的转化研究
吴红艳1; 郑粉莉1,2; 徐锡蒙1; 覃超1; 钟科元1
2016
Source Publication水土保持学报
Volume30Issue:6Pages:147-161
Abstract

选取黄土丘陵区岔巴沟流域不同位置和不同沟道级别的30条典型切沟为研究对象,基于三维激光
扫描技术(LIDAR),建立了基于高分辨率DEM提取切沟形态特征的方法,对比分析了0.1m与5m2种分辨
率DEM提取切沟形态特征参数的差异,实现对低分辨率DEM提取的切沟形态特征参数向高分辨率尺度转
化。结果表明:基于三维激光扫描技术获取的0.1m高分辨率DEM提取的切沟形态特征值与手工测量的切
沟形态特征值之间无显著差异,三维激光扫描技术提取的切沟长度、宽度、深度、表面积和体积分别是手工测
量的94.0%,109.1%,107.7%,80.1%和109.0%,表明三维激光扫描技术获取的0.1m高分辨率DEM可较
准确地描述切沟形态特征。0.1,5m2种分辨率DEM提取的切沟长度间无显著差异,但2种分辨率DEM提
取切沟宽度、深度、表面积和体积间差异显著。5m分辨率DEM提取的切沟宽度、表面积和体积分别较实际
值分别偏大28.6%,25.6%和19.7%;而其提取的切沟深度较实际值偏小37.0%。据此,通过模型筛选,分别
建立了0.1m高分辨率DEM与5m分辨率DEM提取的切沟宽度、表面积和体积转换模型。模型验证结果
表明,本研究所构建的切沟宽度、表面积和体积转换模型的决定系数均大于0.6,模型有效性系数均大于0.5,
说明3个转换模型均具有较好的预报精度,为研究黄土丘陵区沟蚀特征提供了重要方法和手段。

Other Abstract

Gully morphological characteristic indicators are important parameters to study gully erosion
processes quantitatively,but there are only a few reports on the study of gully morphological characteristics
at active stage due to the limitation of DEM resolution.30typical gullies were randomly selected in different
watershed locations and gully orders.Extraction method of gully morphological characteristic indicators was
established based on the 3-D laser scanning technique(LIDAR),differences of gully morphological characteristic
indicators extracted from 0.1mand 5mDEMs were analyzed and transform models of gully morphological
characteristic indicators between different resolution DEMs were established.The results showed that gully
morphological characteristic indicators extracted from 0.1mresolution DEM and manual measurement had
no significant difference;gully length,width,depth,surface area and volume extracted from 0.1mresolution
DEM was 94.0%,109.1%,107.7%,80.1%and 109.0%of that obtained by manual measurement,indicating
that 0.1mresolution DEM could be used to extract gully morphological characteristic indicators accurately.
Gully length extracted from 0.1mresolution DEM had no significant difference with that extracted from 5m
resolution DEM,while gully width,depth,surface area and volume extracted from 0.1mresolution DEM
had significant difference with those extracted from 5mresolution DEM.Gully width,surface area and
volume extracted from 5mresolution DEM was 28.6%,25.6%and 19.7%greater than that extracted from
0.1mresolution DEM,respectively,while gully depth extracted from 5mresolution DEM was 37%smaller
than that extracted from 0.1mresolution DEM.Therefore,transform models of gully width,surface areaand volume were established.Model validation results showed that the correlation coefficients of gully width,surface
area and volume transform model were all greater than 0.6and effectiveness coefficients were all greater than 0.5,
indicating that the accuracies of the three transform models were all acceptable.This study provides an important
method for the study of gully erosion characteristics in the loess hilly-gully region.

Keyword三维激光扫描技术 Dem 切沟形态特征参数 转换模型 黄土丘陵沟壑区
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8533
Collection水保所知识产出(1956-2013)
Affiliation1.西北农林科技大学水土保持研究所黄土高原土壤侵蚀与干旱农业国家重点实验室
2.中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
吴红艳,郑粉莉,徐锡蒙,等. 不同分辨率DEM 提取切沟形态特征参数的转化研究[J]. 水土保持学报,2016,30(6):147-161.
APA 吴红艳,郑粉莉,徐锡蒙,覃超,&钟科元.(2016).不同分辨率DEM 提取切沟形态特征参数的转化研究.水土保持学报,30(6),147-161.
MLA 吴红艳,et al."不同分辨率DEM 提取切沟形态特征参数的转化研究".水土保持学报 30.6(2016):147-161.
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