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Characterization of dynamic evolution of the spatio-temporal variation of rain-field in Hong Kong

机译：香港雨场的时空变化动态演化特征

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摘要

A significant part of Hong Kong has hilly terrain with relatively short flow concentration time and, hence, is susceptible to the threat of flash floods and landslides during intense convective thunderstorms and tropical cyclones. For places like Hong Kong, a rainfall model that could adequately capture small-scale temporal and spatial variations would be highly desirable. The main challenge in rain-field modeling is to capture and describe the dynamic time-space evolution of the rainfall during rainstorm events. In this study, radar data with a high spatial (1 km2) and temporal (6 min) resolution of four rainstorm events in Hong Kong are analyzed. A geostatistical approach based on indicator variograms of rain-fields is used. The spatial structure of a rain-field is found to be highly anisotropic and should be adequately considered in the model. Variability of the spatial structure of a rain-field was described well by the main features of the variograms. Moreover, it is possible to identify whether multiple rainstorm centers exist by comparing the mean length and range. In order to establish reliable statistics on the spatial and temporal structure of rain-fields in Hong Kong, this approach could be applied to a large set of rainstorm events in this same region in the future.
机译：香港很大一部分地区为丘陵地带，流动集中时间相对较短，因此，在强对流雷暴和热带气旋时，容易遭受山洪和泥石流的威胁。对于像香港这样的地方，将非常需要一种能够充分捕获小规模时空变化的降雨模型。雨场建模的主要挑战是捕获和描述暴雨事件期间降雨的动态时空演变。在这项研究中，分析了香港四次暴雨事件的高分辨率（1 km2）和时间（6 min）分辨率的雷达数据。使用了基于雨场指示变量的地统计方法。发现雨场的空间结构是高度各向异性的，应在模型中充分考虑。变异函数的主要特征很好地描述了雨场空间结构的可变性。此外，可以通过比较平均长度和范围来确定是否存在多个暴雨中心。为了建立有关香港雨场的时空结构的可靠统计数据，该方法将来可能会应用于同一地区的大量暴雨事件。

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  • 来源
    《Nordic hydrology》 |2016年第2期|468-482|共15页
  • 作者

    Peng Liu; Yeou-Koung Tung;

  • 作者单位

    State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, 223 Guangzhou Road, Nanjing 210029, China;

    Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    geostatistics; mean length; precipitation; spatial structure; variogram;

    机译：地统计学平均长度沉淀;空间结构变异图;

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