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Estimating the impacts and uncertainty of changing spatial input data resolutions on streamflow simulations in two basins

机译：估算变化的空间输入数据分辨率对两个盆地流模拟的影响和不确定性

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摘要

The impact of different grid resolutions of spatial input data on modelled river runoff are investigated using the simple rainfall-runoff model KIDS (Kielstau Discharge Simulations) in PCRaster modelling language for two watersheds - Kielstau and Xitaoxi. in this study, the grid-based spatial data are aggregated to coarser resolutions to support the multi-resolution, multi-calibration and multi-site analysis for grid-scale investigations. Daily streamflow is simulated and model parameters are calibrated at each spatial resolution. The study suggests that re-calibration is critically needed when the grid resolution is changed. Altering grid sizes has an apparent impact on the parameter distribution patterns. Resolution uncertainty bands obtained by the overlapping hydrographs generated with different resolutions of input data are reported with a sufficient coverage of the observations for both basins. The analysis of model efficiency in terms of IC-ratio (a ratio between the input grid area and the catchment area) indicates that coarser resolutions with an IC-ratio of <0.001 may be used as an effective alternative for conducting preliminary analyses in streamflow simulation for the Kielstau basin. The modelling outputs are more sensitive to the spatial distribution of input data at the XitaoXi watershed, showing that accurate input data are required to achieve optimum modelling performance.
机译：使用PCRaster建模语言中的简单降雨-径流模型KIDS（Kielstau流量模拟），研究了两个输入流域Kielstau和Xitaoxi的空间输入数据的不同网格分辨率对模拟河流径流的影响。在这项研究中，基于网格的空间数据被汇总为较粗略的分辨率，以支持用于网格规模调查的多分辨率，多校准和多站点分析。模拟每日流量，并在每个空间分辨率下校准模型参数。研究表明，当改变网格分辨率时，迫切需要重新校准。更改网格大小会对参数分布模式产生明显影响。报告了由输入数据分辨率不同而产生的重叠水位图获得的分辨率不确定带，并充分覆盖了两个盆地的观测资料。根据IC比率（输入网格面积与集水区面积之比）对模型效率进行的分析表明，IC比率<0.001的较粗分辨率可以用作在流模拟中进行初步分析的有效替代方法基尔施陶盆地。建模输出对XitaoXi流域的输入数据的空间分布更为敏感，这表明需要精确的输入数据才能实现最佳的建模性能。

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  • 来源
    《Journal of Hydroinformatics》 |2012年第4期|p.902-917|共16页
  • 作者

    X. Zhang; G. Hoermann; N. Fohrer; J. Gao;

  • 作者单位

    Department of Hydrology and Water Resources Management, Ecology Centre, Institute for the Conservation of Natural Resources, Christian-Albrechts-university of Kiel, Olshausenstr. 75, D-24118 Kiel, Germany;

    Department of Hydrology and Water Resources Management, Ecology Centre, Institute for the Conservation of Natural Resources, Christian-Albrechts-university of Kiel, Olshausenstr. 75, D-24118 Kiel, Germany;

    Department of Hydrology and Water Resources Management, Ecology Centre, Institute for the Conservation of Natural Resources, Christian-Albrechts-university of Kiel, Olshausenstr. 75, D-24118 Kiel, Germany;

    Nanjing Institute of Geography & Limnology, CAS, Nanjing 210008, China;

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

    grid size upscaling; hydrological modelling; IC-ratio; parameter sensitivity; resolution uncertainty;

    机译：网格尺寸放大;水文模拟;IC比参数灵敏度;分辨率不确定度;

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