GIS-based estimation of fractal dimension and geomorphological development of the water system in the dam construction area
Quan AN1,3, Zhonghua HE1,2,3(), Cuiwei ZHAO1, Hong LIANG1,3, Shulin JIAO1,3, Chaohui YANG4
1. School of Geographic and Environmental Science, Guizhou Normal University, Guiyang 550001, China 2. State Engineering Technology Institute For Karst Desertification Control, Guizhou Normal University, Guiyang 550001,China 3. Key Laboratory of Remote Sensing Application on Mountain Resources and Environment in Guizhou Province, Guiyang 550001, China 4. Department of Emergency Management of Guizhou Province, Guiyang 550001, China
The fractal dimension of water system is one of the quantitative representation methods for determining geomorphic development degree. The study of water system fractal dimension is of great significance for the investigation of the sedimentation mechanism of karst dam basin landform. Advanced space borne thermal emission and reflection radio mater global digital elevation model (ASTER-GDEM) was used as a data source for extracting water system and 30 m resolution ASTER-GDEM. Based on the ArcGIS 10.2, Horton-Strahler theory, water grid method and fishing net method, the authors estimated the water system fractal dimension of Longchangqiao watershed in the dam construction area of Yuzhong, and explore the influence of landform development on the hydrological characteristics of the basin in dam construction. Some conclusions have been reached: The fractal dimensions of the water system estimated by different methods and different data sources under the complex geomorphic structure of the karst area are quite different. The fractal dimension values of the extracted water system of 1.50 million topographic maps estimated by the Horton-Strahler method, the water grid method and the fishing net method are 1.69, 1, 53, 1.54 respectively. The fractal dimensions estimated by 30 m resolution ASTER-GDEM extraction water system are 0.66, 1.59, 1.60. Among them, the fractal dimension values estimated by the Horton-Strahler method are significantly different, with the difference reaching 1.03. Comprehensive analysis of Horton-Strahler theory, water grid method and fishing net method for estimating the relationship between the fractal dimension of different data source water systems and actual landform development in karst dam construction area shows that the water system fractal dimension estimated by the fishing net method and the actual landform status of the study area are most consistent with each other. According to the estimation of the water system estimated by the fishing net, the fractal dimension of the extracted water system estimated by the fishing net method is 1.54, and the fractal dimension estimated by the 30 m resolution ASTER-GDEM extraction system is about 1.60, which suggests that the study area is at the late stage of the young period and the early stage of mature period in geomorphological development, and the results coincide with the actual development of the study area. In addition, three methods were used to estimate the fractal dimension accuracy of the water system in the karst dam basin, and the results show the following order: fishnet method>water grid method>Horton-Strahler method.
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Quan AN, Zhonghua HE, Cuiwei ZHAO, Hong LIANG, Shulin JIAO, Chaohui YANG. GIS-based estimation of fractal dimension and geomorphological development of the water system in the dam construction area. Remote Sensing for Land & Resources, 2019, 31(4): 104-111.
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