BOM IFD - Bureau Of Meteorology, South East Australia (NSW,VIC) Gridded Intensity, Frequency, Duration datasets (.05º 100 year return interval)

The Australian Bureau Of Meteorology - Australian Gridded Intensity, Frequency, Duration Datasets (BOM - IFD) for a 100 year return interval. IFD datasets contain rainfall statistics, with the CSIRO Archive having data for 2, 24 & 72 hour periods at .05° resolution for the South East Australia region covering New South Wales and Victoria. IFD datasets are commonly used in Climate change studies, for design and risk assessment of dams and bridges, design of roof and stormwater drainage systems, flood plain management, soil conservation studies and to express the "severity" of a single rainfall event (in terms of its rarity). The process of estimating IFDs, known as frequency analysis, is an important part of hydrological design procedures. An analysis of rainfall data from a single station is often unreliable; not temporally or spatially consistent; and should generally not be used for design purposes. Instead a set of accurate, consistent IFD data was derived for the whole of Australia by the Bureau of Meteorology as part of the revision of Australian Rainfall and Runoff with the Institute of Engineers Australia(1987). INTENSITY is the rainfall rate (in mm per hour), FREQUENCY is how often a type of rainfall event will occur and DURATION is the period of time over which the rain is measured. There are 3 files covering the 2, 24, 72 hr periods (each ~1.03MB) in Ascii Arcg format totaling approximately 3.11 MB.

澳大利亚气象局（Australian Bureau of Meteorology, BOM）发布的澳大利亚网格化强度、频率、历时数据集（BOM-IFD），适配百年重现期场景。IFD数据集包含降雨统计数据，其中联邦科学与工业研究组织（CSIRO）档案馆存储了覆盖新南威尔士州与维多利亚州的澳大利亚东南部区域、分辨率为0.05°的2小时、24小时及72小时时长的降雨数据。该数据集广泛应用于气候变化研究、大坝与桥梁的设计及风险评估、屋面与雨水排水系统设计、洪泛区管理、水土保持研究，亦可用于表征单次降雨事件的“严重程度”（以其罕见程度，即重现性进行衡量）。估算IFD的过程被称为频率分析，是水文设计流程中的重要环节。仅基于单个站点的降雨数据分析往往可靠性不足，在时间与空间维度上均缺乏一致性，通常不适用于工程设计用途。为此，澳大利亚气象局联合澳大利亚工程师学会（Institute of Engineers Australia），在1987年修订《澳大利亚降雨与径流》标准的项目中，为全澳大利亚构建了一套精准且一致的IFD数据集。其中，强度（INTENSITY）指降雨速率（单位：毫米/小时），频率（FREQUENCY）指某类降雨事件的发生频次，历时（DURATION）指降雨观测的持续时长。本数据集包含对应2小时、24小时、72小时时长的3个文件，均采用Ascii Arcg格式，单个文件大小约1.03MB，总容量约3.11MB。