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Sensors 2017, 17(10), 2213; https://doi.org/10.3390/s17102213

Variation of River Islands around a Large City along the Yangtze River from Satellite Remote Sensing Images

1
School of Marine Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China
2
Department of Geography & Spatial Information Techniques, Ningbo University, Ningbo 315211, China
3
Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA 90095, USA
4
Key Lab of Marine Science and Numerical Modeling, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
5
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
6
College of Territorial Resources and Tourism, Anhui Normal University, Wuhu 241000, China
*
Author to whom correspondence should be addressed.
Received: 3 August 2017 / Revised: 5 September 2017 / Accepted: 21 September 2017 / Published: 27 September 2017
(This article belongs to the Section Remote Sensors)
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Abstract

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. View Full-Text
Keywords: flow and sediment; Nanjing; river islands; remote sensing; soil erosion; sensor; the Yangtze River flow and sediment; Nanjing; river islands; remote sensing; soil erosion; sensor; the Yangtze River
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Shi, H.; Gao, C.; Dong, C.; Xia, C.; Xu, G. Variation of River Islands around a Large City along the Yangtze River from Satellite Remote Sensing Images. Sensors 2017, 17, 2213.

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