Changes and attribution of water surface area in typical regions of China in the past 30 years
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Abstract:
The water surface area ratio is an important indicator of ecological construction.In general,the larger the water area in a region,the better the ecological environment.The water area is affected by both climate change and human activities.The law and cause of water surface area change in China are key scientific issues.In this study,nationwide 9 research areas were selected based on climatic conditions and economic development levels.Based on the Google Earth Engine cloud computing platform,the Landsat image was used to extract water surface area from 1986 to 2018 using the method of combining multiple spectral indices.The dynamic variation of water surface area was analyzed by Mann Kendall test.The contribution of climate change and human activities to water surface area changes were further calculated by double mass analysis and a distributed hydrological model.The results showed that semi arid and semi humid areas were strongly affected by human activities,and there was a significant change was observed in water surface area.Humid areas were affected by climate change,and the water area was also significantly increased.Human activities such as excessive use of water resources,water transfer projects and reservoir construction directly determined changes in water surface area in most areas.This research can provide scientific support for ecological construction.
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