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| DOI：10.13522/j.cnki.ggps.2020191 |
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| Spatiotemporal Variation of Surface Water Resources in Inner Mongolia from 1990 to 2015 |
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YUAN Ruiqiang, QING Song
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1.College of Geographical Science, Inner Mongolia Normal University, Huhhot 010022, China; 2.Key Laboratory of Remote Sensing and Geographic Information System,Inner Mongolia Autonomous Region, Huhhot 010022, China
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| Abstract: |
| 【Background】 Inner Mongolia, located in the arid and semi-arid region of central Eurasia, is the home to numerous lakes, rivers and reservoirs. These surface water resources are of great significance to ecosystem functions but have dwindled significantly over the past few decades due to the combined impacts of anthropogenic activities and climate change, leading to environmental deterioration. Understanding spatiotemporal change in these surface waters and their determinants is hence indispensable for improving water management and restoring functions of ecosystems in this region. 【Objective】 This paper is to analyze the spatiotemporal changes in surface water in Inner Mongolia from 1990 to 2015, and the impact of climate change and anthropogenic activities. 【Method】 We divided the whole region into four sub-regions and compared the performance and stability of six spectral indexes: MNDWI, NDWI, AWEI, MBWI, WI2015 and TCW, from which we derived an optimal water-body index most suitable for identifying and extracting surface water bodies for evaluation.【Result】 The surface water in the region had dwindled steadily from 1990 to 2010 and increased from 2010 to 2015. Except Xing’an League, Hohhot and Wuhai which had seen an increase in surface water resources, surface water in other areas had been in decline during this period. The AWEI water body index threshold was stable and had a good stability and practicality; it was more suitable for identifying and monitoring surface water in this region. 【Conclusion】 Factors impacting surface waters in Inner Mongolia are complex and diverse, but overall, they can be classified as climatic factors and anthropogenic factors, especially the latter which were the main forces driving down the waters in both rivers and lakes. |
| Key words: surface water; Landsat image; water index; Inner Mongolia |
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