Queensland Floodplain Assessment Overlay - Queensland Reconstruction Authority (QRA)

## **Abstract** \n\nThis data and its metadata statement were supplied to the Bioregional Assessment Programme by a third party and are presented here as originally supplied. \n\n\n\nThe Queensland Floodplain Assessment Overlay (QFAO) represents a floodplain area within drainage sub-basins in Queensland. It has been developed for use by local governments as a potential flood hazard area. It represents an estimate of areas potentially at threat of inundation by flooding. The data has been developed through a process of drainage sub-basin analysis utilising data sources including 10 metre contours, historical flood records, vegetation and soils mapping and satellite imagery. This data represents an initial assessment and will be subject to refinement by respective Local Government Authorities.\n\n## **Dataset History** \n\nLineage statement:\n\nThe Queensland Floodplain Assessment Overlay has been captured by analysis and visual interpretation of a combination of datasets (listed below in Sources).\n\nProcess step:\n\n1. Identify and overview sub-basin with satellite imagery backdrop.2. Overlay ordered drainage and floodplain data.3. Analyse drainage lines within the basin to determine the drainage lines that are relevant. At a minimum drainage lines with order 1 and 2 are excluded unless known events have occurred.4. Having determined the approximate extent in terms of drainage line hierarchy, overlay the 10m contours, gauging stations and flood lines of actual events from 2011.5. Determine the approximate flood elevation at locations within the drainage basin using gauging station data and actual events, together with visual interpretation of the imagery and other layers.6. Delineate the extent of the floodplain by visually interpolating between known locations using the satellite imagery and contours as the guide.Flood extent line revised over the town of Mareeba in the Barron River Basin sub area on 17-10-2013.\n\nSource:\n\n1. 10m contours derived from 1 second SRTM (Shuttle Radar Topography), photogrammetry and LiDAR. In general, coverage of SRTM derived contours is west of the Great Dividing Range, Photogrammetrically derived contours coverage is over the Great Dividing Range and Cape York, LiDAR Contour coverage is the coastal fringe extending south of Cairns to the NSW border;2. Floodplain boundaries - derived by combination of Pre-clear Vegetation Mapping of Landzone 3 (Alluvium), Landzone 1 (Estuarine) and SALI Soil Flooding Limitation Mapping;3. Ordered Drainage (drainage lines);4. January 2011 Flood gauge readings and delineation of flooding events from aerial photography;5. 2009 SPOT satellite imagery;6. 2009 LandSAT satellite imagery.\n\n## **Dataset Citation** \n\nQueensland Department of Natural Resources and Mines (2013) Queensland Floodplain Assessment Overlay - Queensland Reconstruction Authority (QRA). Bioregional Assessment Source Dataset. Viewed 06 May 2016, http://data.bioregionalassessments.gov.au/dataset/ea785644-eff9-4ee2-9f1a-8dca1dde7ee5.

## 摘要

本数据集及其元数据声明由第三方提供给生物区域评估计划（Bioregional Assessment Programme），本文档将按原始提交内容呈现该数据。

昆士兰洪泛区评估叠加层（Queensland Floodplain Assessment Overlay, QFAO）划定了昆士兰州流域子盆地内的洪泛区范围。该数据集专为地方政府识别潜在洪灾风险区域而开发，用于估算可能遭受洪水淹没的风险区域。本数据集通过流域子盆地分析流程构建，所用数据源包括10米等高线、历史洪水记录、植被与土壤制图以及卫星影像。本数据集仅为初步评估成果，后续将由各地方政府主管部门进行优化完善。

## 数据集历史

谱系说明：
昆士兰洪泛区评估叠加层通过对多组数据集（详见下文“数据来源”部分）的分析与目视解译生成。

处理步骤：
1. 以卫星影像为底图，识别并概览流域子盆地范围。
2. 叠加分级水系与洪泛区数据。
3. 分析盆地内的水系，筛选有效水系。默认排除1级与2级水系，除非有已知洪水事件佐证。
4. 根据水系等级确定大致范围后，叠加10米等高线、水文测站数据以及2011年实际洪水的淹没线。
5. 结合水文测站数据、实际洪水事件，辅以影像与其他图层的目视解译，确定流域内各点位的近似洪水水位高程。
6. 以卫星影像与等高线为参照，通过已知点位间的目视插值勾绘洪泛区范围。2013年10月17日，对巴伦河盆地子区域内的马里巴（Mareeba）城镇周边的洪水淹没线进行了修订。

数据来源：
1. 10米等高线：源自1秒分辨率航天飞机雷达地形测绘（Shuttle Radar Topography, SRTM）、摄影测量与激光雷达（LiDAR）数据。其中，SRTM生成的等高线覆盖大分水岭以西区域；摄影测量生成的等高线覆盖大分水岭与约克角半岛区域；激光雷达等高线覆盖从凯恩斯以南延伸至新南威尔士州边界的沿海地带。
2. 洪泛区边界：结合土地带3（冲积层）、土地带1（河口区）的清前植被制图，以及SALI土壤洪水限制制图生成。
3. 分级水系（水系线）。
4. 2011年1月水文测站读数与航空摄影解译的洪水事件淹没范围。
5. 2009年SPOT卫星影像。
6. 2009年LandSAT卫星影像。

## 数据集引用

昆士兰州自然资源与矿产部（2013）《昆士兰洪泛区评估叠加层》——昆士兰州重建局（Queensland Reconstruction Authority, QRA）。生物区域评估源数据集。2016年5月6日查阅，http://data.bioregionalassessments.gov.au/dataset/ea785644-eff9-4ee2-9f1a-8dca1dde7ee5。