Study on the ground fraction of air tankers
Yin Gu
A , Rui Zhou A * , Hui Xie B and Lei Shi B
+ Author Affiliations
- Author Affiliations
A Institute of Public Safety Research, Department of Engineering Physics, Tsinghua University, Beijing, 100084, China.
B AVIC General Huanan Aircraft Industry Co., Ltd., Zhuhai, 519040, China.
* Correspondence to: zhour@tsinghua.edu.cn
International Journal of Wildland Fire 32(4) 576-592 https://doi.org/10.1071/WF22055
Submitted: 5 November 2021 Accepted: 11 December 2022 Published: 19 January 2023
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing on behalf of IAWF. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Abstract
Background: The ground fraction refers to the ratio of the liquid collected on the ground to the dropped liquid, which is the key index used to assess the drop ground pattern of air tankers when combating wildfires. However, there is no quantitative mechanism model to estimate ground fraction.
Aims and methods: The current work aims to create a simple model of the ground fraction by directly using full-scale drop test data with different firefighting agents for fitting.
Key results and conclusions: The result shows that the ground fraction can be estimated by simple quantitative relationships despite significant differences between the conditions of the drop tests. These relationships include factors that can be manipulated during aircraft and release system design as well as during aerial firefighting operations.
Implications: Based on the presented model, an equation for the maximum coverage level of the mean liquid distribution is solved, and the induced effects of drop velocity, drop height, liquid viscosity and other factors on the ground pattern are revealed, which can provide direct predictions of ground drop distributions.
Keywords: aerial firefighting, air tanker, coverage level, data fitting, dimensional analysis, fire retardant, full-scale drop test, ground fraction, ground pattern.
References
Amorim JH (2008) Numerical modelling of the aerial drop of products for forest firefighting. PhD thesis, University of Aveiro, Portugal.Amorim JH (2011) Numerical modelling of the aerial drop of firefighting agents by fixed-wing aircraft. Part II: model validation. International Journal of Wildland Fire 20, 394–406.
| Numerical modelling of the aerial drop of firefighting agents by fixed-wing aircraft. Part II: model validation.Crossref | GoogleScholarGoogle Scholar |
Andersen WH, Wong JY (1978) Dynamic interaction of fire retardant droplets with fuel, and correlation with the rheological properties of the retardant. Final Report 7660–02. (USDA Forest Service, Northern Forest Fire Laboratory: Ogden, UT)
Andersen WH, Brown RE, Kato KG, Louie NA (1974) Investigation of rheological properties of aerial-delivered fire retardant. Final report 8990–05. (USDA Forest Service, Northern Forest Fire Laboratory: Ogden, UT)
Artés T, Oom D, de Rigo D, Durrant TH, Maianti P, Libertà G, San-Miguel-Ayanz J (2019) A global wildfire dataset for the analysis of fire regimes and fire behaviour. Scientific Data 6, 296
| A global wildfire dataset for the analysis of fire regimes and fire behaviour.Crossref | GoogleScholarGoogle Scholar |
George CW (1985) An operational retardant effectiveness study. Fire Management Notes 46, 18–23.
George CW (1990) An update on the Operational Retardant Effectiveness(ORE) program. In ‘The Art and Science of Fire Management. Proceedings of the First Interior West Fire Council Annual Meeting and Workshop’, 24–27 October 1988, Kananaskis, AB, Canada. (Eds ME Alexander, GF Bisgrove) Information Report NOR-X-309. pp. 114–122. (Forestry Canada, Northwest Region, Northern Forestry Centre: Edmonton, AB)
George CW, Johnson GM (1990) Developing air tanker performance guides. General Technical Report INT-268. (USDA Forest Service, Intermountain Research Station: Ogden, UT)
Inamura T, Nagai N (1997) Spray characteristics of liquid jet traversing subsonic airstreams. Journal of Propulsion and Power 13, 250–256.
| Spray characteristics of liquid jet traversing subsonic airstreams.Crossref | GoogleScholarGoogle Scholar |
Johnson G, Jordan C (2000a) Ground pattern performance of the SEI industries Bambi 324-gallon helibucket. Technical Report 0057–2802-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Johnson G, Jordan C (2000b) Ground pattern performance of the Marsh Turbo Thrush. Technical Report 0057–2835-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Johnson G, Jordan C (2000c) Ground pattern performance of the Western Pilot Services Dromader. Technical Report 0057–2834-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Legendre D, Becker R, Alméras E, Chassagne A (2014) Air tanker drop patterns. International Journal of Wildland Fire 23, 272–280.
| Air tanker drop patterns.Crossref | GoogleScholarGoogle Scholar |
McCarthy GJ, Plucinski MP, Gould JS (2012) Analysis of the resourcing and containment of multiple remote fires: the Great Divide Complex of fires, Victoria, December 2006. Australian Forestry 75, 54–63.
| Analysis of the resourcing and containment of multiple remote fires: the Great Divide Complex of fires, Victoria, December 2006.Crossref | GoogleScholarGoogle Scholar |
Moritz MA, Batllori E, Bradstock RA, Gill AM, Handmer J, Hessburg PF, Leonard J, McCaffrey S, Odion DC, Schoennagel T, Syphard AD (2014) Learning to coexist with wildfire. Nature 515, 58–66.
| Learning to coexist with wildfire.Crossref | GoogleScholarGoogle Scholar |
Oda T, Hiroyasu H, Arai M, Nishida K (1994) Characterization of liquid jet atomization across a high-speed airstream. JSME International Journal Series B Fluids and Thermal Engineering 37, 937–944.
| Characterization of liquid jet atomization across a high-speed airstream.Crossref | GoogleScholarGoogle Scholar |
Paudel J (2021) Beyond the blaze: the impact of forest fires on energy poverty. Energy Economics 101, 105388
| Beyond the blaze: the impact of forest fires on energy poverty.Crossref | GoogleScholarGoogle Scholar |
Plucinski MP, Pastor E (2013) Criteria and methodology for evaluating aerial wildfire suppression. International Journal of Wildland Fire 22, 1144–1154.
| Criteria and methodology for evaluating aerial wildfire suppression.Crossref | GoogleScholarGoogle Scholar |
Plucinski MP, McCarthy GJ, Hollis JJ, Gould JS (2012) The effect of aerial suppression on the containment time of Australian wildfires estimated by fire management personnel. International Journal of Wildland Fire 21, 219–229.
| The effect of aerial suppression on the containment time of Australian wildfires estimated by fire management personnel.Crossref | GoogleScholarGoogle Scholar |
Plucinski MP, Sullivan AL, Hurley RJ (2017) A methodology for comparing the relative effectiveness of suppressant enhancers designed for the direct attack of wildfires. Fire Safety Journal 87, 71–79.
| A methodology for comparing the relative effectiveness of suppressant enhancers designed for the direct attack of wildfires.Crossref | GoogleScholarGoogle Scholar |
Rimbert N, Séro-Guillaume O (2004) Log-stable laws as asymptotic solutions to a fragmentation equation: application to the distribution of droplets in a high Weber-number spray. Physical Review E 69, 056316
| Log-stable laws as asymptotic solutions to a fragmentation equation: application to the distribution of droplets in a high Weber-number spray.Crossref | GoogleScholarGoogle Scholar |
Santín C, Doerr SH (2016) Fire effects on soils: the human dimension. Philosophical Transactions of the Royal Society B: Biological Sciences 371, 20150171
| Fire effects on soils: the human dimension.Crossref | GoogleScholarGoogle Scholar |
Solarz P, Jordan C (2000a) Ground pattern performance of the Airspray Electra L-188 with Aero Union constant flow tank. Technical Report 0057–2851-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Solarz P, Jordan C (2000b) Ground Pattern Performance of the Aero Union SP-2H. Technical Report 0057–2849-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Solarz P, Jordan C (2000c) Ground pattern performance of the Aero Flite DC4 airtanker with modified Ardco conventional tank. Technical Report 0057–2867-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Solarz P, Jordan C (2000d) Ground pattern performance of the Neptune P2V–7 airtanker. Technical Report 0057–2848-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Solarz P, Jordan C (2000e) Ground pattern performance of the Snow Air Tractor with constant flow tank. Technical Report 0057–2852- MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Solarz P, Jordan C (2000f) Ground pattern performance of the LA County Bell S205 helicopter with Sheetcraft fixed tank. Technical Report 0057–2863-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Solarz P, Jordan C (2000g) Ground pattern performance of the Columbia BV-107 helicopter using the 1000-gallon Griffith Big Dipper helibucket. Technical Report 0057–2865-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Solarz P, Jordan C (2000h) Ground pattern performance of the Siller Brothers S-61N helicopter using the 1000-gallon Griffith big dipperbhelibucket. Technical Report 0057–2864-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Solarz P, Jordan C (2001a) Ground pattern performance of the California Department of Forestry Bell S205 and National Guard UH-1 helicopters with the 240-gallon SEI Industries Bambi helibucket. Technical Report 0157–2807- MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Solarz P, Jordan C (2001b) Ground Pattern Performance of the California Department of Forestry Bell S205 Helicopter With the 300-Gallon Sims Rainmaker Collapsible Helibucket. Technical Report 0157–2803-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Solarz P, Jordan C (2001c) Ground Pattern Performance of the Forest Service Bell 206 Helicopter With the 100-Gallon Sims Rainmaker Helibucket. Technical Report 0157–2805-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Solarz P, Jordan C (2001d) Ground Pattern Performance of the National Guard Black Hawk Helicopter With the 660-Gallon SEI Industries Bambi Helibucket. Technical Report 0157–2804-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Solarz P, Jordan C (2001e) Ground Pattern Performance of the Forest Service Bell 206 Helicopter With the 100-Gallon SEI Industries Bambi Helibucket. Technical Report 0157–2808-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Solarz P, Jordan C (2001f) Ground Pattern Performance of the Siller Brothers S-64 Helicopter With the 2,000-Gallon SEI Industries Bambi Helibucket. Technical Report 0157–2806-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Stonesifer CS, Calkin DE, Thompson MP, Stockmann KD (2016) Fighting fire in the heat of the day: an analysis of operational and environmental conditions of use for large airtankers in United States fire suppression. International Journal of Wildland Fire 25, 520–533.
| Fighting fire in the heat of the day: an analysis of operational and environmental conditions of use for large airtankers in United States fire suppression.Crossref | GoogleScholarGoogle Scholar |
Suter A (2000) Drop testing airtankers: a discussion of the cup-and-grid method. Technical Report 0057–2868-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Suter A (2002) Estimating methods, variability, and sampling for drop-test data. Technical Report 0257–2826-MTDC. (USDA Forest Service, Missoula Technology and Development Center: Missoula, MT)
Thompson MP, Calkin DE, Herynk J, McHugh CW, Short KC (2013) Airtankers and wildfire management in the US Forest Service: examining data availability and exploring usage and cost trends. International Journal of Wildland Fire 22, 223–233.
| Airtankers and wildfire management in the US Forest Service: examining data availability and exploring usage and cost trends.Crossref | GoogleScholarGoogle Scholar |
Wu P-K, Kirkendall KA, Fuller RP, Nejad AS (1998) Spray structures of liquid jets atomized in subsonic crossflows. Journal of Propulsion and Power 14, 173–182.
| Spray structures of liquid jets atomized in subsonic crossflows.Crossref | GoogleScholarGoogle Scholar |
