Assessing Ecological Impacts and Recovery in Coal Mining Areas: A Remote Sensing and Field Data Analysis in Northwest China
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area
2.2. Data Sources
2.2.1. Satellite Imagery
- DEM: The Shuttle Radar Topography Mission (SRTM) DEM was generated using radar instruments that were mounted on the Space Shuttle Endeavour, which during an 11-day mission in February 2000, emitted radar pulses to map the Earth’s land elevations. This research utilizes DEMs from SRTM, specifically collected during this February 2000 mission, prior to the mining activities, alongside the 2022 UAV DEM for terrain assessment. These DEMs are vital for calculating slopes, aspects, surface roughness [28], and terrain relief [29], serving as analytical parameters to explore the topographic changes pre- and post-extraction activities.
- Landsat Data: The study utilizes multi-temporal Landsat 8 imagery, supplemented by Landsat 7 as needed, covering the period from 2013 to 2022. To minimize seasonal effects on vegetation status, images were collected during the peak vegetation growth season, from July to September. A Google Earth Engine (GEE)-based cloud detection algorithm was used to filter out images with over 10% cloud cover, resulting in the selection of up to 54 images with minimal cloud interference. These images offer a 16-day temporal resolution and a 30-m spatial resolution. All data were sourced from the USGS website (https://glovis.usgs.gov/, accessed on 1 January 2024). Given that the Landsat 7 Enhanced Thematic Mapper Plus (ETM+) sensor experienced a scan line corrector (SLC) malfunction in 2003, leading to data gaps and reduced usability, the study primarily relies on Landsat 8 imagery. However, in instances where Landsat 8 data encountered issues, data fusion techniques were employed to combine Landsat 7 and Landsat 8 imagery. This approach leveraged the higher quality and continuity of Landsat 8 data to supplement and correct the Landsat 7 data, ensuring consistency and reliability in the combined dataset.
2.2.2. Unmanned Aerial Vehicle (UAV) Data
2.2.3. Soil Data
2.3. Methods
2.3.1. The Impact of Erlintu Coal Mine Exploitation on Topographic Factors
2.3.2. Crack Extraction
2.3.3. The Construction of NDVI, VFC, and RSEI
2.3.4. Classification Method of Evolution Trend of VFC
2.3.5. Collection and Detection of Soil Samples
3. Results
3.1. Periodic Impact of Erlintu Coal Mine Exploitation on Topographic Factors
3.2. Using UAVs to Monitor Ground Fissures and Ecological Recovery Processes in Mining Areas
3.3. Assessing Vegetation Dynamics in Response to Mining Activities through Satellite Imagery
3.3.1. Analysis of NDVI Variations in the Trial Region
3.3.2. Analysis of Changes in VFC in the Trial Region
3.3.3. Analysis of RSEI Variations in the Erlintu Coal Mine-Affected Area
3.4. Impact Characteristics of Coal Shaft Mining on Soil’s Physicochemical Properties
4. Discussion
4.1. Analysis of Cyclical Vegetation Response to Mining Disturbances
4.2. Impact of Mining Activities on Terrain and Crack
4.3. Impact of Mining Activities on Soil
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Test Area | Mining Disturbance Time | Area | Ecological Restoration Measures |
---|---|---|---|
A1 | 2014 disturbance | 26.45 km2 | Tree planting |
A2 | Undisturbed | 35.44 km2 | None |
B1 | 2019 disturbance | 40.97 km2 | Fissure infilling; grass seeding |
B2 | Undisturbed | 27.33 km2 | None |
C | 2023 disturbance | 41.97 km2 | Fissure infilling; grass seeding |
Indicator | Calculation Formula | Reference |
---|---|---|
NDVI | Tucker et al. (1979) [40] | |
VFC | Carlson et al. (1997) [43] | |
WET | Zawadzki et al. (2016) [44] | |
NDBSI | Xu et al. (2008) [45] Essa et al. (2012) [46] | |
LST | Jimenez-Munoz et al. (2009) [47] |
Difference | Evolution Type |
---|---|
D ≤ −30% | Obvious degradation |
−30% < D ≤ −15% | General degradation |
−15% < D ≤ −5% | Slight degradation |
−5% < D ≤ 5% | Stable |
5% < D ≤ 15% | Slight improvement |
15% < D ≤ 30% | General improvement |
30% ≥ D | Obvious improvement |
Indicator | Measurement Method | Reference |
---|---|---|
Soil Moisture Content (SMC) | Gravimetric Method | Lide, David R. (2004) [48] |
PH Value | Potentiometric Method | Ahluwalia, V.K. (2023) [49] |
Total Nitrogen (TN) | Semi-micro Kjeldahl Method | Brabson, John A. (1966) [50] |
Available Phosphorus (AP) | Olsen Method | Olsen, P.S. et al. (1954) [51] |
Available Potassium (AK) | Flame Atomic Absorption Spectrophotometry | Christian, Gary D. et al. (1980) [52] |
Indicator | Grading Criteria and Frequency | ||||||
---|---|---|---|---|---|---|---|
AP (mg/kg) | Abundance-Deficiency | Rich | Relatively Rich | Moderate | Relatively Deficient | Deficient | Extremely Deficient |
Grading Criteria | >40 | 20~40 | 10~20 | 5~10 | 3~5 | <3 | |
Frequency | 0 | 1 | 0 | 2 | 7 | 29 | |
AK (mg/kg) | Grading Criteria | >200 | 150~200 | 100~150 | 50~100 | 30~50 | <30 |
Frequency | 0 | 0 | 9 | 24 | 6 | 0 | |
TN (g/kg) | Grading Criteria | >2.0 | 1.5~2.0 | 1.0~1.5 | 0.75~1.0 | 0.5–0.75 | <0.5 |
Frequency | 0 | 0 | 0 | 1 | 20 | 18 | |
pH | Acidity–Alkalinity | Strongly Acidic | Acidic | Neutral | Alkaline | Strongly Alkaline | Extremely Strong Alkalinity |
Grading Criteria | 4.5~5.5 | 5.5~6.5 | 6.5~7.5 | 7.5~8.5 | 8.5~9.5 | >9.5 | |
Frequency | 0 | 0 | 0 | 14 | 23 | 2 | |
SMC (%) | Degree of Drought | Slightly Wet | Appropriate | Mild Drought | Moderate Drought | Severe Drought | |
Grading Criteria | >20 | 15–20 | 12~15 | 5~12 | <5 | ||
Frequency | 0 | 0 | 2 | 34 | 3 |
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Song, D.; Hu, Z.; Yu, Y.; Zhang, F.; Sun, H. Assessing Ecological Impacts and Recovery in Coal Mining Areas: A Remote Sensing and Field Data Analysis in Northwest China. Remote Sens. 2024, 16, 2236. https://doi.org/10.3390/rs16122236
Song D, Hu Z, Yu Y, Zhang F, Sun H. Assessing Ecological Impacts and Recovery in Coal Mining Areas: A Remote Sensing and Field Data Analysis in Northwest China. Remote Sensing. 2024; 16(12):2236. https://doi.org/10.3390/rs16122236
Chicago/Turabian StyleSong, Deyun, Zhenqi Hu, Yi Yu, Fan Zhang, and Huang Sun. 2024. "Assessing Ecological Impacts and Recovery in Coal Mining Areas: A Remote Sensing and Field Data Analysis in Northwest China" Remote Sensing 16, no. 12: 2236. https://doi.org/10.3390/rs16122236
APA StyleSong, D., Hu, Z., Yu, Y., Zhang, F., & Sun, H. (2024). Assessing Ecological Impacts and Recovery in Coal Mining Areas: A Remote Sensing and Field Data Analysis in Northwest China. Remote Sensing, 16(12), 2236. https://doi.org/10.3390/rs16122236