黄土地貌区径流节点提取及其特征信息指数的DEM实验分析  

A Novel Index Designed for Feature Information of Runoff Nodes Based on DEM

作　　者：胡最[1,2,3] 蒋圣[2] 梁明[2] 

机构地区：[1]衡阳师范学院资源环境与旅游管理系,衡阳421002 [2]南京师范大学教育部虚拟地理环境重点实验室,南京210046 [3]湖南省古村古镇文化遗产数字化传承协同创新中心,衡阳421002

出　　处：《地球信息科学学报》2015年第6期689-697,共9页Journal of Geo-information Science

基　　金：国家自然科学基金项目(41201398;41401440);湖南省自然科学基金项目(12JJ7003)

摘　　要：径流节点是一种真实存在于流域单元中的地学实体对象,携带了大量的水文与地貌特征信息。针对当前研究中缺乏定量地度量径流节点所承载的地学特征信息量的相关探讨,本文结合径流节点的已有理论,总结了其地学特征信息,借鉴数学粗集理论提出了径流节点的特征信息指数(FIIRN),并分析了相关的定义与计算方法。本文以黄土高原的7个典型黄土地貌样区5 m分辨率DEM数据为实验材料,提取了各个实验样区的径流节点,并计算了每个样区的FIIRN指数值。实验结果表明:(1)FIIRN指数可有效地映射流域单元的径流分级、发育状况等地学特征信息;(2)FIIRN指数可定量地表达流域单元的地学特征信息量;(3)FIIRN指数可作为挖掘流域地学特征信息的一个重要参数。Runoff nodes, which could be captured from every watershed on earth, are one type of the real geo- graphical entities within the river-network. Generally, runoff nodes often locate at sites where lower grade of run- offs merging themselves into a more advanced trunk stream. It is clear that runoff nodes carry a lot of hydraulic and landform information. Although many reports have documents related to runoff nodes, the quantitative mea- suring researches, that concerning the geographical information of runoff nodes and taking advantages of valid theories or methods, are still rare. This may prevent people from further understanding the existence of runoff nodes in nature. Aimed to solve the aforementioned issue, this paper employs the Theory of Rough Sets （TRS） to develop a new landscape metric for perfectly characterizing the geographical features of runoff nodes. Firstly, ac- cording to current knowledge about runoff nodes, this paper extracts the potential information carried by runoff nodes. Secondly, this paper reviews some typical valid methods on how to extract runoff nodes from Digital Ele- vation Models （DEM）. Thirdly, this paper presents the feature information index of runoff nodes （FIIRN） and il- lustrates the relevant computing procedures. Based on these researches and preparations, this paper carries out a case study of FIIRN for seven special regions from the Loess Plateau of China （which well represents the typical loess landscapes existed in the world）. The experimental materials of DEM data are predominantly characterized with 5 meters of resolution. With the help of ArcGIS 10.1 software, this paper extracts all runoff nodes from the experimental sample regions according to their geometric features in the runoff network. Then, this paper com- putes the values of FIIRN using Excel 2003 and MATLAB 7.7. Surprisingly, the results show that FIIRN can ef- fectively map the complete geographical information of a given watershed unit. Therefore, as we concluded in this paper, that FIIRN c

关 键 词：径流节点 地学特征信息 流域 FIIRN DEM 

分 类 号：P208[天文地球—地图制图学与地理信息工程] P931.6[天文地球—测绘科学与技术]