Clark单位线法是一种分散型集总式的单位线模型。基于Clark单位线的线性性质,可以将单一线性水库分别平移至不同等流时单元进行调蓄,建立相应的单位线,并按不同等流时单元传播滞时分别进行推移叠加,从而改进成为一种分布式的单位线模型表述形式。该分布式单位线模型演算参数取值方法包括2种:整体算术平均与逐级算术平均。将改进后的分布式单位线模型应用于沿渡河子流域时段单位线的推求,并与他人采用传统Clark单位线法计算得到的时段单位线进行了比较,结果表明对Clark单位线法的分布式改进是合理的。研究成果为以后进一步将Clark单位线法分布改进应用于水文响应单元提供了基础。
Abstract
In view of the linear characteristic of Clark unit hydrograph, a distributed unit hydrograph representation was proposed in which the unit hydrograph for each derived isochrones of areas with Nash’s linear reservoir model can be established and then are overlaid in consideration of lag-routing time. Calculus parameter in the distributed unit hydrograph model can be computed by two methods: integral or gradually arithmetic average. In association with the proposed distributed unit hydrograph model, the unit hydrograph in Yandu river watershed was calculated and the result is consistent with that computed using Clark method by others. The result suggests that the improvement on Clark unit hydrograph by distributed representation in this article is reasonable, hence offering a foundation for further improvement in the application to hydrological response unit in the future.
关键词
Clark单位线 /
线性性质 /
等流时单元 /
分布式改进 /
演算参数
Key words
Clark unit hydrograph /
linear characteristic /
isochronous cell /
improvement by distributed representation /
calculus parameter
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参考文献
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基金
国家自然科学基金青年基金项目(51709125);河南省教育厅科研项目资助计划项目(17A57006);开封市科技局科技计划项目(1503037)
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