摘要
湖南省是我国水土流失较严重的地区,而地形、地貌是造成水土流失的重要因素之一。本文针对不同地形地貌特征对水土流失情况影响进行定量分析研究,从县域尺度选取了湘阴县、桃江县、桂东县三县不同典型地貌特征,通过Arc GIS软件利用ASTER和SRTM数字高程数据提取坡度值,分别按照间距为1°的等差分级方法和湖南省水土保持临界坡度的分级方法,绘制了地面坡谱图,进一步计算获得了坡谱信息熵。结果表明:湘阴县、桃江县、桂东县地貌坡度1°分级信息熵由小变大,体现了地貌形态在空间的变化特征;而各县临界坡度分级信息熵的大小反映了各地水土流失情况,有效地证实了坡谱信息熵参数能够定量分析和反映不同区域地貌起伏复杂程度及水土保持情况。
Hunan province is one of the regions where water and soil erosion is serious, while the land - form is one of the key factors causing water and soil erosion. Through an quantitative analysis and study of the influence of different geomorphic features on water and soil erosion, Xianying County, Taojiang County and Guidong County, three typical land - forms, are selected from the county scale. Slope values are extracted from ASTER and SRTM DED via ARCGIS software. And then formulate slope spectra according to arithmetic classification method with one space and Hunan province conservation of water and soil critical slope classification so as to calculate the slope spectrum entropy. The results demonstrate that the slope spectrum entropy of landform slope in Xianying County, Taojiang County and Guidong County according to one degree grading grows larger and larger, which reflects the changing features of geomorphologic shape in space. However, the number of the slope classification information entropy on the boundary of various counties reflects the situation of water and soil erosion in different regions, which effectively proves that the parameter of slope spectra entropy can quantitatively analyze and reflect the complexity of morphologic prominence and the situation of water and soil erosion in different regions.
出处
《测绘与空间地理信息》
2016年第11期97-101,共5页
Geomatics & Spatial Information Technology
基金
国家自然科学基金项目(41472302)资助
关键词
坡度
坡谱
信息熵
水土流失
slope
slope spectrum
slope spectrum entropy
water and soil erosion
作者简介
陈佳音（1990-），女，湖南益阳人，地图学与地理信息系统专业硕士研究生，主要研究方向为三维地学建模。
通讯作者：邹艳红（1971-），女，湖南桃江人，副教授，博士，2005年毕业于中南大学国土资源信息工程专业，主要从事三维地学建模与GIS应用开发工作。
