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Geoscience ›› 2024, Vol. 38 ›› Issue (03): 793-806.DOI: 10.19657/j.geoscience.1000-8527.2024.001

• Comprehensive Evaluation of Geological Landscape Resources • Previous Articles     Next Articles

Topography and Fractal Characteristics and Their Genesis of the Wudalianchi Volcanic Group in Heilongjiang

WANG Jinyu1,2(), LIU Yongshun2(), PAN Meihui1(), NIE Baofeng2, ZOU Wang2, LU Zhi2, ZHANG Xinyi2   

  1. 1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou, Gansu 730070, China
    2. College of Resources Environment and Tourism, Capital Normal University, Beijing 100048, China
  • Online:2024-06-10 Published:2024-07-04

Abstract:

Volcanic topography is essential to study the formation of volcanoes and evolution of planetary morphology.Based on the remote sensing images and DEM data of the Wudalianchi volcanic area, we analyzed fractal characteristics and performed the comprehensive interpretation in its formation, and discussed the complex genetic mechanisms of the geomorphic system in this volcanic area.The results show that (1) volcanic cones and lava topography constitute the surface morphology with low undulation frequency in the area, and the number of composite volcanic cones distributed along the fractures affects the topographic complexity in this direction.(2) The topography of this area shows a fractal structure of multiscale domains and a small fractal dimension (D≈2), which was presumably influenced by the extensive lava topography and low volcanic cones.The fractal dimensions of the topographic profiles in the directions of fractures show that the geomorphic anisotropy of the three fracture directions in the Wudalianchi volcanic area is relatively small (D=1.142-1.275), and the difference between Dmax and Dmin is only 0.133.However, the fractal dimensions in the NE direction are large (DNE=1.223-1.275), which is the principal fracture direction affecting the volcanic topography.(3) The topographic characteristics of the volcanic group are determined by internal and external agents, and two sets of fractural structures (deep and shallow fractures) and magmatic systems are the main factors affecting its topographic features at the present stage.The role of external agent in stochastic coarsening at the meso-to-micro scale is intensifying, but synergistic antagonism has not yet prevailed at the macro scale, and the complex regional topography of the volcanic group has not yet changed.Remote sensing spectral features and topographic analyses are effective to investigate the volcanic topography, and the quantitative fractal characteristics can interpret the topographic characteristics at different scales and becoming a novel approach to study volcanic topography and their genesis.

Key words: Wudalianchi Volcanic Group, volcanic topography, remote sensing image, geomorphic fractal, genetic mechanism

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