摘要
面积高程积分(Hypsometric Integral,HI)是刻画流域地貌形态与发育阶段的重要地理指标。为了探究山西省黄土高原重点水土流失区的面积高程积分空间分异特征,以30 m分辨率的SRTM数据为基本信息源,采用积分曲线法计算研究区的面积高程积分值。研究工作首先分析了DEM分辨率与流域稳定面积对HI值的影响,然后进一步研究流域内各地貌对象高程积分值的相关性,最后得到研究区面积高程积分空间分布结果。结果表明:小流域面积高程积分受DEM分辨率的影响较小,面积高程积分趋于稳定的小流域面积阈值为0.04 km^2;研究区HI值相关性较强的地貌对象组合为山顶点—山脊线—沟谷网络;区域内面积高程积分值的地域差异性从北到南,表现出大—小—大的空间分布趋势。山西省黄土高原重点水土流失区的HI值整体处于0.35~0.6,区域内流域基本处于发育的壮年期,表现为强烈的水系扩张分支,应加强水土保持工作的力度。
Area elevation integral(Hypsometric Integral,HI)is an important geographical indicator to describe the landform morphology and development stage of a watershed.In order to explore the spatial differentiation characteristics of the area elevation integral in the key soil and water loss areas of the Loess Plateau in Shanxi,the integral curve method is used to calculate the area elevation integral value by taking the SRTM data of 30 m resolution as the basic information source.Firstly,the influence of DEM resolution and watershed stability area on HI value is analyzed.Then,the correlation of elevation integral values of various geomorphic objects in the watershed is further studied.Finally,the spatial distribution results of elevation integral are obtained.The results show that the small watershed area elevation integral is less affected by the DEM resolution,and the small watershed area threshold where the area elevation integral tends to stabilize is 0.04 km^2.The combination of geomorphic objects with strong correlation are peak HI,ridge line HI and valley HI.The regional differences in area elevation integral values show a large-small-large spatial distribution trend from north to south.The HI value of the key soil and water loss areas in the Loess Plateau of Shanxi is between 0.35 and 0.6,and the watersheds in the region are basically in the periods of development and maturity,which is manifested as a strong branch of water system expansion.Soil and water conservation should be strengthened in the research area.
作者
段宇英
汤军
段宇雄
DUAN Yuying;TANG Jun;DUAN Yuxiong(School of Earth Sciences,Yangtze University,Wuhan 430100,China;Shanxi Huaye Land and Mineral Resources Consulting Co.,Ltd.,Taiyuan 030001,China)
出处
《水土保持研究》
CSCD
北大核心
2020年第5期81-86,共6页
Research of Soil and Water Conservation
基金
国家自然科学基金青年基金,顾及空间上下文关系的能量最小化地图多要素协同移位方法,41701537。
关键词
流域发育
面积高程积分
空间分异
山西黄土高原
watershed development
hypsometric integral
spatial variation
Loess Plateau in Shanxi
作者简介
第一作者:段宇英(1996—),女,山西临汾人,硕士研究生,研究方向为水土保持。E-mail:2889088991@qq.com;通信作者:汤军(1964—),男,陕西勉县人,博士,硕士生导师,研究方向为地理信息。E-mail:374216030@qq.com。
