• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>British Journal of Environment and Climate Change >Open Data Flood Mapping of Chao Phraya RiverBasin and Bangkok Metropolitan Region
【24h】

Open Data Flood Mapping of Chao Phraya RiverBasin and Bangkok Metropolitan Region

机译：湄南河盆地和曼谷都会区的开放数据洪水测绘

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Aims: To examine the utility of open data for flood mapping of the Bangkok Metropolitan Region and Chao Phraya River basin. The region is particularly vulnerable to flooding, having experienced recurrent major flooding events, including the some of the most extensive and prolonged in 2011.Study Design: Novel methodologies were innovated utilising open spatial data and open source geographical software to generate flood extent/hazard maps of the Bangkok Metropolitan Region and Chao Phraya River basin. Key geospatial data were sourced from the Thai Geo-Informatics and Space Technology Development Agency and NASA’s Shuttle Radar Topography Mission.Methodology: Given limited resources for conducting detailed hydrological-hydraulic analyses, two alternative approaches were examined for flood extent/hazard mapping of the basin and city. The first method made use of publicly available historical flood data to produce an up-to-date composite flood extent/hazard map. The second approach, using the latter output as a reference source, examined the utility of a modified topographic index for delineating flood-prone areas, as integrated into the r.hazard.flood module of the open source GRASS GIS application.Results: Compilation of multi-year historical data enabled generation of a relatively fine-scale (~100m spatial resolution) flood extent/hazard map for the basin and city. The optimal tau threshold for delineating flood exposed cells from the modified topographic index was linearly related to the sub-basin mean slope. The four most northerly sub-basins of the Chao Phraya basin, those with higher mean slopes, gave lowest total errors, ranging from 17.5 to 35.9 percent.Conclusions: Open data in the form of multi-year spatial flood layers were effectively combined to generate a relatively fine-scale flood extent/hazard map for the Chao Phraya River basin and Bangkok Metropolitan Region, and the modified topographic index showed promise as an alternative means for identifying flood exposed areas.
机译：目的：研究开放数据在曼谷市区和湄南河盆地洪水地图绘制中的作用。该地区特别容易遭受洪灾，经历了反复发生的重大洪灾事件，其中包括一些在2011年最广泛和持续时间最长的洪灾事件。研究设计：利用开放空间数据和开源地理软件对新型方法进行了创新，以生成洪灾程度/灾害图曼谷都会区和湄南河流域。关键的地理空间数据来自泰国地理信息和空间技术发展局以及美国宇航局的航天飞机雷达地形任务。方法：由于有限的资源无法进行详细的水文-水力分析，因此对流域的洪水程度/危害作图进行了两种研究和城市。第一种方法是利用公开可用的历史洪水数据来生成最新的综合洪水范围/灾害图。第二种方法使用后一种输出作为参考源，研究了修改后的地形指数用于描绘易发洪水区域的实用性，该方法已集成到开源GRASS GIS应用程序的r.hazard.flood模块中。多年的历史数据可以为流域和城市生成相对精细的（约100m空间分辨率）洪水范围/灾害图。从修改后的地形指数描绘洪灾暴露细胞的最佳tau阈值与亚盆地平均斜率线性相关。湄南河流域最北端的四个子盆地平均斜率较高，总误差最低，范围从17.5％到35.9％。结论：有效结合多年空间洪水层形式的开放数据，生成绘制了湄南河流域和曼谷都会区的相对较小比例的洪水范围/灾害图，修改后的地形指数显示出有望作为识别洪灾暴露地区的替代方法。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号