A SCALE INVARIANCE MODEL FOR SPATIAL DOWNSCALING OF TOPOGRAPHIC INDEX IN TOPMODEL
A SCALE INVARIANCE MODEL FOR SPATIAL DOWNSCALING OF TOPOGRAPHIC INDEX IN TOPMODEL
复制标题
TOPMODEL中地形指数空间降尺度的尺度不变模型
DOI：
10.2208/prohe.48.109
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
K. Takara
中科院分区：
文献类型：
--
作者：
N. Pradhan;Y. Tachikawa;K. Takara
未能将主要地貌参数的尺度相关性转化为有效的水文模型，这对只有粗分辨率高程数据的未测量流域构成了一个严重的问题。为解决这一问题，分析了数字高程数据分辨率与TopModel地形指数地貌参数关系的尺度规律。通过引入分辨率因子和地形指数尺度最大坡度的分形方法，建立了地形指数分布向下尺度的尺度不变性模型。该方法成功地利用高分辨率DEM提取了高分辨率DEM的地形指数分布。将尺度不变性模型应用于龟井坝流域(210km2)，结果表明，向下尺度的地形指数分布与目标地形指数分布相似。
Failure to translate scale dependencies of dominating geomorphometric parameters into effective hydrological models has posed a serious problem for ungauged basins where only coarse resolution elevation data is available. To overcome this problem, scale laws that govern the relation in digital elevation data resolution on geomorphometric parameters of topographic index of TOPMODEL have been analyzed. A scale invariance model for down scaling of topographic index distribution has been developed by introducing a resolution factor and a fractal method for the scaled steepest slope in topographic index. The method successfully derived topographic index distribution of fine resolution DEM by using only coarse resolution DEM. The scale invariance model has been applied to Kamishiiba catchment (210 km2) and it is shown that the down scaled topographic index distribution is similar to a target topographic index distribution.