Variation of River Islands around a Large City along the Yangtze River from Satellite Remote Sensing Images
River islands are sandbars formed by scouring and silting. Their evolution is affected by several factors, among which are runoff and sediment discharge. The spatial-temporal evolution of seven river islands in the Nanjing Section of the Yangtze River of China was examined using TM (Thematic Mapper)...
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MDPI AG
2017-09-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/17/10/2213 |
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| author | Haiyun Shi Chao Gao Changming Dong Changshui Xia Guanglai Xu |
| author_facet | Haiyun Shi Chao Gao Changming Dong Changshui Xia Guanglai Xu |
| author_sort | Haiyun Shi |
| collection | DOAJ |
| description | River islands are sandbars formed by scouring and silting. Their evolution is affected by several factors, among which are runoff and sediment discharge. The spatial-temporal evolution of seven river islands in the Nanjing Section of the Yangtze River of China was examined using TM (Thematic Mapper) and ETM (Enhanced Thematic Mapper)+ images from 1985 to 2015 at five year intervals. The following approaches were applied in this study: the threshold value method, binarization model, image registration, image cropping, convolution and cluster analysis. Annual runoff and sediment discharge data as measured at the Datong hydrological station upstream of Nanjing section were also used to determine the roles and impacts of various factors. The results indicated that: (1) TM/ETM+ images met the criteria of information extraction of river islands; (2) generally, the total area of these islands in this section and their changing rate decreased over time; (3) sediment and river discharge were the most significant factors in island evolution. They directly affect river islands through silting or erosion. Additionally, anthropocentric influences could play increasingly important roles. |
| first_indexed | 2024-04-13T08:46:21Z |
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| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-13T08:46:21Z |
| publishDate | 2017-09-01 |
| publisher | MDPI AG |
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| series | Sensors |
| spelling | doaj.art-3a81e81dcede4c91887430c0e838a9142022-12-22T02:53:39ZengMDPI AGSensors1424-82202017-09-011710221310.3390/s17102213s17102213Variation of River Islands around a Large City along the Yangtze River from Satellite Remote Sensing ImagesHaiyun Shi0Chao Gao1Changming Dong2Changshui Xia3Guanglai Xu4School of Marine Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, ChinaDepartment of Geography & Spatial Information Techniques, Ningbo University, Ningbo 315211, ChinaSchool of Marine Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, ChinaKey Lab of Marine Science and Numerical Modeling, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, ChinaCollege of Territorial Resources and Tourism, Anhui Normal University, Wuhu 241000, ChinaRiver islands are sandbars formed by scouring and silting. Their evolution is affected by several factors, among which are runoff and sediment discharge. The spatial-temporal evolution of seven river islands in the Nanjing Section of the Yangtze River of China was examined using TM (Thematic Mapper) and ETM (Enhanced Thematic Mapper)+ images from 1985 to 2015 at five year intervals. The following approaches were applied in this study: the threshold value method, binarization model, image registration, image cropping, convolution and cluster analysis. Annual runoff and sediment discharge data as measured at the Datong hydrological station upstream of Nanjing section were also used to determine the roles and impacts of various factors. The results indicated that: (1) TM/ETM+ images met the criteria of information extraction of river islands; (2) generally, the total area of these islands in this section and their changing rate decreased over time; (3) sediment and river discharge were the most significant factors in island evolution. They directly affect river islands through silting or erosion. Additionally, anthropocentric influences could play increasingly important roles.https://www.mdpi.com/1424-8220/17/10/2213flow and sedimentNanjingriver islandsremote sensingsoil erosionsensorthe Yangtze River |
| spellingShingle | Haiyun Shi Chao Gao Changming Dong Changshui Xia Guanglai Xu Variation of River Islands around a Large City along the Yangtze River from Satellite Remote Sensing Images Sensors flow and sediment Nanjing river islands remote sensing soil erosion sensor the Yangtze River |
| title | Variation of River Islands around a Large City along the Yangtze River from Satellite Remote Sensing Images |
| title_full | Variation of River Islands around a Large City along the Yangtze River from Satellite Remote Sensing Images |
| title_fullStr | Variation of River Islands around a Large City along the Yangtze River from Satellite Remote Sensing Images |
| title_full_unstemmed | Variation of River Islands around a Large City along the Yangtze River from Satellite Remote Sensing Images |
| title_short | Variation of River Islands around a Large City along the Yangtze River from Satellite Remote Sensing Images |
| title_sort | variation of river islands around a large city along the yangtze river from satellite remote sensing images |
| topic | flow and sediment Nanjing river islands remote sensing soil erosion sensor the Yangtze River |
| url | https://www.mdpi.com/1424-8220/17/10/2213 |
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