| Technology Application |
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Evaluation of environmental vulnerability in the upper reaches of the Minjiang River |
| YANG Bin1,2, ZHAN Jinfeng1, LI Maojiao1 |
1. College of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China;
2. College of Water Sciences, Beijing Normal University, Beijing 100875, China |
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Abstract With TM remote sensing data and topographic data as the main data sources, coupled with other statistical information obtained in the upper reaches of Minjiang River, the authors tried to apply the analytic hierarchy process(AHP) to reframing the vulnerability characteristics resulting from complicated factors and establishing the comprehensive evaluation index system and the model with multiple objective elements. Vegetation index change rate, population density, terrain relief, slope and soil type were five factors serving as evaluation index factors in the AHP to determine the weight of each evaluation index, and superimposition analysis of the indicators was made on the ArcGIS platform. The grade map of comprehensive evaluation on ecological environment in the reaches of the Minjiang River could be obtained, which was classified into five degrees in the environmental vulnerability. The results achieved by the authors indicate that environmental vulnerability of the upper reaches of the Minjiang River is extremely intense, caused mainly by natural factors and human factors. The results of his study provide the quantitative and qualitative scientific basis for the construction of the environmental vulnerability pattern and the comprehensive evaluation of ecological environment along the upper reaches of the Minjiang River basin.
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| Keywords
multi-spectral image
change detection
iterative estimation with weight selection(IEWS)
iteratively re-weighted multivariate alteration detection(IRMAD)
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Issue Date: 17 September 2014
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2014,
Vol. 26
