The 2021 Bootleg Fire: A Hydrological Perspective through Remote Sensing and Machine Learning
Publication: World Environmental and Water Resources Congress 2024
ABSTRACT
Wildfires are increasing in frequency and intensity, impacting ecological systems and biodiversity. The aftermath alters hydrological cycles in affected regions, causing soil degradation through the combustion of organic matter and reducing vegetation vitality, which disrupts the natural water balance and increases the risk of erosion. Remote sensing technologies provide insights into these hydrological effects, aiding in watershed modeling and management. The 2021 Bootleg Fire, which occurred in the Fremont-Winema National Forest located in Southern Oregon, serves as a case study; it raged from July 6 until August 15, consuming over 167,000 hectares of forestland. In this research, we assess the Bootleg Fire’s hydrological impact on soil and vegetation. This assessment is carried out by classifying land cover and evaluating changes in pre- and post-fire normalized difference vegetation index (NDVI) for vegetation-related hydrological impacts, along with Differenced Normalized Burn Ratio (dNBR) for burn severity to gauge hydrological impacts on soil and vegetation. Utilizing Google Earth Engine, we obtained time-series Landsat 8 surface reflectance imagery for pre- and post-fire conditions, maintaining a cloud cover threshold below 2% for data accuracy. Subsequent analysis was conducted in Matlab R2023a, employing machine learning algorithms including artificial neural networks and support vector machine to classify land cover into water, barren or impervious, grassland, shrubland, forested areas, and densely forested areas. Our analysis underscores the wildfire’s role as an ecological catalyst, promoting grasslands and shrublands at the expense of tree-dominated areas, which directly correlates with shifts in soil moisture levels. Areas with higher burn severity show more pronounced changes in soil moisture, affecting the hydrological balance and influencing both immediate recovery and future resilience of soil and vegetation. This transformative effect on landscape composition points to substantial, long-term hydrological impacts on both soil moisture retention and vegetation health. The findings of this research not only bear significant implications for fire management policies and resource allocation but also serve as a foundational guide for subsequent, more focused research in understanding the intricate relationships between wildfires and hydrological disruptions.
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REFERENCES
Arcenegui, V., Mataix-Solera, J., Guerrero, C., Zornoza, R., Mataix-Beneyto, J., and Garcia-Orenes, F. (2008). Immediate effects of wildfires on water repellency and aggregate stability in Mediterranean calcareous soils. Catena (Giessen), 74(3), 219–226.
Benavides-Solorio, J.,and MacDonald, L. H. (2001). Post-fire runoff and erosion from simulated rainfall on small plots, Colorado Front Range. Hydrological Processes, 15(15), 2931–2952.
Chen, J., McGuire, K. J., and Stewart, R. D. (2020). Effect of soil water-repellent layer depth on post-wildfire hydrological processes. Hydrological Processes, 34(2), 270–283.
Dennison, P. E., Brewer, S. C., Arnold, J. D., and Moritz, M. A. (2014). Large wildfire trends in the western United States, 1984-2011. Geophysical Research Letters, 41(8), 2928–2933.
Doerr, S. H., Shakesby, R. A., Blake, W. H., Chafer, C. J., Humphreys, G. S., and Wallbrink, P. J. (2006). Effects of differing wildfire severities on soil wettability and implications for hydrological response. Journal of Hydrology (Amsterdam), 319(1-4), 295–311.
Du Plessis, J., and Van Zyl, H. (2021). The effect of veld fires on the hydrological response of streamflow. Water S. A., 47(2), 185–193.
Folador, L., Cislaghi, A., Vacchiano, G., and Masseroni, D. (2021). Integrating remote and in-situ data to assess the hydrological response of a post-fire watershed. Hydrology, 8(4), 169.
Fox, D. M., Darboux, F., and Carrega, P. (2007). Effects of fire-induced water repellency on soil aggregate stability, splash erosion, and saturated hydraulic conductivity for different size fractions. Hydrological Processes, 21(17), 2377–2384.
Giambastiani, B. M. S., Greggio, N., Nobili, G., Dinelli, E., and Antonellini, M. (2018). Forest fire effects on groundwater in a coastal aquifer (Ravenna, Italy). Hydrological Processes, 32(15), 2377–2389.
Gordillo-Rivero, Á. J., García-Moreno, J., Jordán, A., Zavala, L. M., and Granja-Martins, F. M. (2014). Fire severity and surface rock fragments cause patchy distribution of soil water repellency and infiltration rates after burning. Hydrological Processes, 28(24), 5832–5843.
Granged, A. J. P., Jordán, A., Zavala, L. M., and Bárcenas, G. (2011). Fire-induced changes in soil water repellency increased fingered flow and runoff rates following the 2004 Huelva wildfire. Hydrological Processes, 25(10), 1614–1629.
Hallema, D. W., Sun, G., Bladon, K. D., Norman, S. P., Caldwell, P. V., Liu, Y., and McNulty, S. G. (2017). Regional patterns of postwildfire streamflow response in the Western United States: The importance of scale‐specific connectivity. Hydrological Processes, 31(14), 2582–2598.
Jordan, A., Zavala, L. M., Mataix-Solera, J., Nava, A. L., and Alanis, N. (2011). Effect of fire severity on water repellency and aggregate stability on Mexican volcanic soils. Catena (Giessen), 84(3), 136–147.
Letey, J. (2001). Causes and consequences of fire-induced soil water repellency. Hydrological Processes, 15(15), 2867–2875.
Ortega-Becerril, J. A., Garrote, J., Vicente, Á., ans Marqués, M. J. (2022). Wildfire-Induced Changes in Flood Risk in Recreational Canyoning Areas: Lessons from the 2017 Jerte Canyons Disaster. Water (Basel), 14(15), 2345.
Pierson, F. B., Robichaud, P. R., and Spaeth, K. E. (2001). Spatial and temporal effects of wildfire on the hydrology of a steep rangeland watershed. Hydrological Processes, 15(15), 2905–2916.
Pierson, F. B., Robichaud, P. R., Moffet, C. A., Spaeth, K. E., Hardegree, S. P., Clark, P. E., and Williams, C. J. (2008). Fire effects on rangeland hydrology and erosion in a steep sagebrush-dominated landscape. Hydrological Processes, 22(16), 2916–2929.
Rodriguez-Alleres, M., Varela, M. E. T., and Benito, E. (2012). Natural severity of water repellency in pine forest soils from NW Spain and influence of wildfire severity on its persistence. Geoderma, 191, 125–131.
Scott, D. F., and Van Wyk, D. B. (1990). The effects of wildfire on soil wettability and hydrological behaviour of an afforested catchment. Journal of Hydrology (Amsterdam), 121(1-4), 239–256.
Scott, D. F. (1997). The Contrasting Effects Of Wildfire And Clearfelling On The Hydrology Of A Small Catchment. Hydrological Processes, 11(6), 543–555.
Serra-Burriel, D. P., Prata, A. T., and Cucchietti, F. M. (2021). Estimating heterogeneous wildfire effects using synthetic controls and satellite remote sensing. Remote Sensing of Environment, 265, 112649.
Shakesby, R. A., and Doerr, S. H. (2006). Wildfire as a hydrological and geomorphological agent. Earth-Science Reviews, 74(3-4), 269–307.
Shakesby, R. A., Wallbrink, P. J., Doerr, S. H., English, P. M., Chafer, C. J., Humphreys, G. S., Blake, W. H., and Tomkins, K. M. (2007). Distinctiveness of wildfire effects on soil erosion in south-east Australian eucalypt forests assessed in a global context. Forest Ecology and Management, 238(1), 347–364.
Shao, and Lunetta, R. S. (2012). Comparison of support vector machine, neural network, and CART algorithms for the land-cover classification using limited training data points. ISPRS Journal of Photogrammetry and Remote Sensing, 70, 78–87.
United States Department of Agriculture Forest Service. (2023). “Land Change Monitoring, Assessment, and Projection.” <https://data.fs.usda.gov/geodata/rastergateway/LCMS/index.php>(Dec. 5, 2023).
USGS. (2023). “Landsat Normalized Burn Ratio.” <https://www.usgs.gov/landsat-missions/landsat-normalized-burn-ratio>(Dec.5, 2023).
USGS. (2023). “NDVI, the foundation of remote sensing phenology.” <https://www.usgs.gov/special-topics/remote-sensing-phenology/science/ndvi-foundation-remote-sensing-phenology#:~:text=Although%20there%20are%20several%20vegetation,example%2C%200.1%20or%20less>(Dec. 5, 2023).
Varela, M. E., Benito, E., and de Blas, E. (2005). Impact of wildfires on surface water repellency in soils of northwest Spain. Hydrological Processes, 19(18), 3649–3657.
Venkatesh, K., Preethi, K., and Ramesh, H. (2020). Evaluating the effects of forest fire on water balance using fire susceptibility maps. Ecological Indicators, 110, 105856.
White, A. M., Lockington, D. A., and Gibbes, B. (2017). Does fire alter soil water repellency in subtropical coastal sandy environments? Hydrological Processes, 31(2), 341–348.
Wu, J., Baartman, J. E. M., and Nunes, J. P. (2021). Comparing the impacts of wildfire and meteorological variability on hydrological and erosion responses in a Mediterranean catchment. Land Degradation & Development, 32(2), 640–653.
Xu, Z., Zhang, Y., Zhang, X., Ma, N., Tian, J., Kong, D., and Post, D. (2022). Bushfire‐Induced Water Balance Changes Detected by a Modified Paired Catchment Method. Water Resources Research, 58(11), n/a–n/a.
Zavala, L., Granged, A. U. P., Jordan, A., and Barcenas-Moreno, G. (2010). Effect of burning temperature on water repellency and aggregate stability in forest soils under laboratory conditions. Geoderma, 158(3-4), 366–374.
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Information
Published In
World Environmental and Water Resources Congress 2024
Pages: 1623 - 1638
History
Published online: May 16, 2024
ASCE Technical Topics:
- Artificial intelligence and machine learning
- Computer programming
- Computing in civil engineering
- Detection methods
- Disaster risk management
- Disasters and hazards
- Ecosystems
- Engineering fundamentals
- Environmental engineering
- Geomechanics
- Geotechnical engineering
- Hydrologic engineering
- Hydrology
- Measurement (by type)
- Methodology (by type)
- Natural disasters
- Sensors and sensing
- Soil mechanics
- Soil properties
- Soil water
- Vegetation
- Water and water resources
- Water management
- Wild fires
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