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Subsidence Characteristics in North Anhui Coal Mining Areas Using Space-Air-Ground Collaborative Observations.

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Coal mining subsidence in North Anhui expanded by 8.1% from 2019-2022, causing significant land use changes and ecological damage. Restoration efforts are underway, with Huaibei showing the highest governance rate.

Keywords:
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Area of Science:

  • Environmental Science
  • Geology
  • Remote Sensing

Background:

  • Coal mining subsidence poses significant ecological and land-use challenges.
  • Accurate monitoring is crucial for effective ecological mine restoration and management, especially in complex mining regions like North Anhui, China.

Purpose of the Study:

  • To construct a space-air-ground collaborative monitoring system for coal mining areas.
  • To investigate the characteristics of coal mining subsidence in North Anhui using multi-source remote sensing data.

Main Methods:

  • Development of a space-air-ground collaborative monitoring system.
  • Utilizing multi-source remote sensing data for subsidence analysis.
  • Characterizing land use changes and subsidence depths.

Main Results:

  • 16 new subsidence areas identified (2019-2022), total area increased by 8.1%.
  • Significant land use shifts: increased water bodies (+101.9 km²), decreased cultivated land (-99.3 km²), and decreased residential land (-11.8 km²).
  • Subsidence depths categorized: light (<500 mm), medium (500-1500 mm), and heavy (>1500 mm) across 740.9 km².

Conclusions:

  • Subsidence governance covers 26.5% of the total subsidence area, with varying rates across cities (Huaibei: 51.3%, Huainan: 10.1%, Fuyang: 13.6%).
  • Reclamation efforts have restored 34.5% of the governed subsidence area.
  • Stable subsidence conditions achieved in 276.1 km², predominantly in the Huaibei mining area (approx. 60% of stable areas).