张宏鸣,杨勤科,王猛,杨江涛,王美丽,晋蓓.梯田区侵蚀地形因子随DEM分辨率变化的特征分析[J].农业机械学报,2017,48(10):172-179.
ZHANG Hongming,YANG Qinke,WANG Meng,YANG Jiangtao,WANG Meili,JIN Bei.Analysis of DEM Resolution on Erosional Terrain Characteristics of Terrace Area[J].Transactions of the Chinese Society for Agricultural Machinery,2017,48(10):172-179.
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梯田区侵蚀地形因子随DEM分辨率变化的特征分析   [下载全文]
Analysis of DEM Resolution on Erosional Terrain Characteristics of Terrace Area   [Download Pdf][in English]
投稿时间:2017-02-06  
DOI:10.6041/j.issn.1000-1298.2017.10.021
中文关键词:  土壤侵蚀  中国水土流失方程  地形因子  梯田  数字高程模型
基金项目:国家重点研发计划项目(2017YFC0403203)、国家自然科学基金项目(41771315、41301283、41371274、41301507、61402374)、欧盟地平线2020研究与创新计划项目(ISQAPER: 635750)、陕西省自然科学基础研究计划项目(2016JM6038)和西北农林科技大学基本科研业务费专项资金项目(2452015060)
作者单位
张宏鸣 西北农林科技大学 
杨勤科 西北大学 
王猛 西北农林科技大学 
杨江涛 西北农林科技大学 
王美丽 西北农林科技大学 
晋蓓 西北农林科技大学 
中文摘要:通过无人机航空摄影测量,获取高精度DEM,分析提取的坡度、坡长和LS因子,同时通过分辨率的变化,计算并分析了这些参数的变化情况。研究表明:基于无人机获取的DEM能够较好地表达梯田地形特征,梯田地形因子分布特征与地形特征吻合,大值集中于梯田过渡的陡坡处,小值集中于田面。随着分辨率的降低,非梯田区坡度整体呈现衰减趋势,坡长呈现增长趋势,LS先小幅增加,后由于坡度衰减明显,LS呈现衰减趋势,但变化幅度不大;而梯田区随着分辨率的降低,小坡度和超大坡度所占比例均减小,平均坡度降低,但坡长增加显著,因此导致LS增长较显著,在20m分辨率下,LS因子被高估约1/3。梯田通常作为水保措施因子单独来考虑,由于分辨率对地形因子影响较大,因此梯田区的地形因子估算需要考虑分辨率的影响。
ZHANG Hongming  YANG Qinke  WANG Meng  YANG Jiangtao  WANG Meili  JIN Bei
Northwest A&F University,Northwest University,Northwest A&F University,Northwest A&F University,Northwest A&F University and Northwest A&F University
Key Words:soil erosion  Chinese soil loss equation  topographic factor  terrace  DEM
Abstract:Terrain is a main environmental factor which affects the surface hydrology and soil erosion. Slope steepness, slope length and LS factor are important parameters in soil erosion model. As a water conservation measure, terraced field changes the surface morphology and affects slope steepness, slope length and LS factor. Terrain features of the terraced area based on low resolution DEM are fuzzy and difficult to be reasonably estimated due to the lacking of high precision. High resolution DEM, which was accessed by UAV aerial photogrammetry technology, was used to analyze slope steepness, slope length and LS factor under different resolutions. Meanwhile, the changes of these parameters were calculated and analyzed in a none terraced area with the same resolution changes as comparison. The result showed that the DEMs which were accessed by UAV can express the terrace terrain features in details. Distribution of terraced terrain factors coincided with topographic features. These features showed high values distributed in the ridge area and small values distributed in terrace surface. With the decrease of DEM resolutions, the slope steepness of none terraced areas was decreased while the slope length was increased, and LS value was increased firstly and then decreased because of the fast decrease of the slope steepness, but the variation range was relatively small. For terraced areas, the portion of both small and large part of the slope steepness was decreased, average slope steepness was also decreased. Slope length had a clear increasing trend, so as the LS factor. Under the resolution of 20m, LS factor was overestimated for about 33%. Terracing is usually considered as a project factor in soil erosion models of soil and water conservation measures. Due to the large influence of resolution on LS factors, the estimation of erosion in terraced field needs to consider the effect of resolution changes.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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