Procedure Computation Instance

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{
    "ob_id": 25831,
    "uuid": "1d9929b28e79491585373e69337cee65",
    "title": "McArthur Forest Fire Danger Index (FFDI) Calculation Methodology used within the HELIX project",
    "abstract": "The The High-End cLimate Impacts and eXtremes (HELIX) project calculated fire indexes values at 1.5 and 2 degree resolution the McArthur Forest Fire Danger Index (FFDI) (Noble et al, 1980) equation is as follows:\r\n\r\nFFDI = 1.25 * D * exp [ (T - H)/30.0 + 0.0234 * V]\r\n\r\n\r\n\r\nWhere:\r\n - D = drought factor, \r\n - T = Temperature (ºC), \r\n - H = humidity (%), and \r\n - V = wind speed (km hr-1). \r\n\r\nThe drought factor (D) is calculated as follows:\r\n\r\nD = (0.191 * ( I + 104) * (N + 1)^ 1.5) / (3.52 * (N+1)^1.5 + P -1)\r\n\r\n\r\n\r\nWhere :\r\n - P = precipitation (mm day-1),\r\n - N = number of days since last rain, and \r\n - I is based on Keetch-Byram drought index. \r\n\r\nThis represents the moisture in the upper soils layers that denotes flammability of organic matter (Keetch and Byram, 1968). The HELIX Project used a varying soil moisture to calculate the deficit compared to the field capacity at a depth of 1m.\r\n\r\n\r\nReferences:\r\n\r\nKeetch, John J.; Byram, George M. (1968). A Drought Index for Forest Fire Control. Res. Pap. SE-38. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southeastern Forest Experiment Station. 35 p. https://www.srs.fs.usda.gov/pubs/rp/rp_se038.pdf\r\n\r\n\r\nNoble, I. (1980). McArthur's fire-danger meters expressed as equations. Australian Journal of Ecology, 5, 201-203. Re-published in July 2006 DOI: 10.1111/j.1442-9993.1980.tb01243.x",
    "keywords": "",
    "inputDescription": 4,
    "outputDescription": null,
    "softwareReference": null,
    "identifier_set": []
}