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Ecological environment assessment of three-river confluence in Yibin City using improved remote sensing ecological index |
ZHANG Qinrui1(), ZHAO Liangjun2(), LIN Guojun1, WAN Honglin3 |
1. Artificial Intelligence Key Laboratory of Sichuan Province, School of Automation and Information Engineering, Sichuan University of Science and Engineering, Yibin 644000, China 2. Key Laboratory of Higher Education of Sichuan Province for Enterprise Informationalization and Internet of Things, School of Automation and Information Engineering, Sichuan University of Science and Engineering, Zigong 643000, China 3. Department of Water Conservancy, Hebei University of Water Resources and Electric Engineering, Cangzhou Technology Innovation Center of Remote Sensing and Smart Water, Cangzhou 061001, China |
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Abstract Urban expansion is the main characteristic of Yibin City in recent years, and the study of its impacts on ecology is significant for urban development and ecological protection. To assess the impacts of urban expansion on the ecology more accurately, this study established an improved remote sensing ecological index (IRSEI) by using the impervious surface area index as the dryness index to replace the original building index. The IRSEI coupled the improved dryness index and the indices greatly influencing the ecology, such as greenness, humidity, and temperature. This study analyzed the IRSEI using principal component analysis and correlation and established an IRSEI-based ecological assessment model of the three-river (i.e., the Jinsha River, Minjiang River, and Yangtze River) confluence in Yibin City. Then, this study analyzed and assessed the ecological environment of the confluence in 2013—2020. The results are as follows. The IRSEI can more accurately reflect the negative impacts of the dryness index on the ecology of the confluence. It can concentrate more useful information in the first principal component than the RSEI and can better apply to the quality assessment of urban ecological environment. In 2013, the IRSEI of the confluence was 0.54, indicating the moderate ecological status overall. The reason is that the original vegetation was destroyed by serious urban expansion. In 2017, the IRSEI was 0.67. The greenness was significantly improved by the continuous advancement of returning farmland to forests and the restoration of urban ecology, which is the reason that the ecology has greatly improved in 2017 compared to 2013. In 2020, the IRSEI was 0.63. The greenness, humidity, and dryness in 2020 were roughly the same as those in 2013, while the temperature rose in 2020 compared to 2017 due to the heat island effect induced by urban expansion. This is the reason for the slight decline in the ecological level in 2020.
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Keywords
improved remote sensing ecological index (IRSEI)
principal component analysis
correlation
three-river confluence in Yibin City
ecological assessment
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Corresponding Authors:
ZHAO Liangjun
E-mail: 1029765315@qq.com;149189602@qq.com
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Issue Date: 14 March 2022
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