• “数字地形分析”专栏 •

### 基于BEMD分解的地貌分类研究

1. 1. 南京信息工程大学滨江学院,南京 210044
2. 南京信息工程大学应用气象学院,南京 210044
• 收稿日期:2019-05-30 修回日期:2019-12-06 出版日期:2020-03-25 发布日期:2020-05-18
• 通讯作者: 邱新法 E-mail:xfqiu135@nuist.edu.cn
• 作者简介:顾文亚（1980— ）,女,江苏常州人,副教授,博士生,主要从事3s集成与气象应用。E-mail：wygu@nuist.edu.cn
• 基金资助:
江苏省普通高校研究生科研创新计划项目(KYLX_0850);国家自然科学基金项目(41805049);滨江学院校级课题(2019bjyng005)

### Geomorphological Classification Research based on BEMD Decomposition

GU Wenya1, MENG Xiangrui1, ZHU Xiaochen2, QIU Xinfa2,*()

1. 1. School of Binjiang, Nanjing University of Information Science & Technology, Nanjing 210044, China
2. School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China
• Received:2019-05-30 Revised:2019-12-06 Online:2020-03-25 Published:2020-05-18
• Contact: QIU Xinfa E-mail:xfqiu135@nuist.edu.cn
• Supported by:
Research Innovation Program for Postgraduates of Ordinary Universities in Jiangsu Province(KYLX_0850);National Natural Science Foundation of China(41805049);The Subject of Binjiang School(2019bjyng005)

Abstract:

Geomorphology refers to the ups and downs of the terrain, that is, the shape of the surface. Geomorph-ological classification plays an important role in many application fields such as temperature, precipitation and solar irradiation. In this paper, the Digital Elevation Model(DEM) data of Fujian province with a spatial resolution of 90 m is selected as the geographic signal. The two-dimensional empirical mode decomposition(BEMD) is applied for decomposition processing to obtain several two-dimensional intrinsic mode functions(BIMF1~ BIMF3) with different scales and different physical meanings as well as the corresponding residual ORIG. These BIMF components correspond to the microtopography of different scales, and ORIG shows the geomorphic distribution trend of the study area, reflecting the general distribution area of plains, hills and mountains. The optimal calculation unit is determined by the method of variable point analysis, and the first order classification of each signal area is carried out by using the degree of relief, and the second level classification is carried out according to the absolute height. Finally, the first class classification and the second order classification are combined to realize the classification of terrain. This classification process reflects the complex characteristics of geomorphological assemblage in the study area. The results show that: (1) Superimpose BIMF components and extract the components and regions larger than 74m as high-frequency signal regions. The region is dominated by the low mountains with small relief amplitude, and is accompanied by middle mountain with small relief amplitude and hills. (2) The region with residual height less than or equal to 340m in ORIG was extracted, and the region containing high frequency signal was removed as the low-frequency signal region, which was mainly plain and hills. (3) The remaining area is defined as the intermediate frequency signal area, and the geomorphology of the area is dominated by flat hills and small mountains with small relief amplitude. The results show that the geomorphology of Fujian can be divided into seven main types: low frequency plain, low frequency hill, intermediate frequency hill, high frequency hill, low mountain with small degree of relief in middle frequency, low mountain with small degree of relief in high frequency, middle mountain with small degree of relief in high frequency.