Effect of growing watershed imperviousness on hydrograph parameters and peak discharge
Effect of growing watershed imperviousness on hydrograph parameters and peak discharge
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DOI：
10.1002/hyp.6807
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发表时间：
2008-06
影响因子：
3.2
通讯作者：
Huang Huang-Huang;Shin-jen Cheng;J. Wen;Ju‐huang Lee
中科院分区：
文献类型：
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作者：
Huang Huang-Huang;Shin-jen Cheng;J. Wen;Ju‐huang Lee
由于人们无穷无尽的要求，越来越多的防渗区正迅速延伸到乌图分水岭。一般来说，不透水路面是城市化的一个主要结果，最近有可能造成比过去更严重的洪水灾害。在这项研究中，选取了40个可用的降雨-径流事件来校准模型的适用参数，并确定不透水面与校准参数之间的关系。模型输入来自块克立格法和非线性规划法的结果。在优化过程中，应用混洗复合进化方法和三个准则对观测和模拟的过程线进行了比较。通过回归分析，确定了各参数随透气性的变化趋势。用10个算例检验了所建立的参数方程和防渗层方程。最后，利用设计暴雨、块体克里格法、SCS模型和建立了函数关系的降雨径流模型，给出了不同重现期的设计洪水例程。这些模拟的洪水过程线被用来比较和了解研究流域过去、现在和未来的水文条件。研究结果表明，不同暴雨的洪峰出现时间约为11h~6h，不同暴雨强度下的洪峰流量分别从127m~3 S−1增加到629m~3 S−1。此外，本研究还提供了洪峰流量比的设计图，以帮助工程师和设计人员高效地建造水工建筑物，防止可能对人类生命财产造成的损害。版权所有©2007 John Wiley&Sons，Ltd.
An increasing impervious area is quickly extending over the Wu‐Tu watershed due to the endless demands of the people. Generally, impervious paving is a major result of urbanization and more recently has had the potential to produce more enormous flood disasters than those of the past. In this study, 40 available rainfall–runoff events were chosen to calibrate the applicable parameters of the models and to determine the relationships between the impervious surfaces and the calibrated parameters. Model inputs came from the outcomes of the block kriging method and the non‐linear programming method. In the optimal process, the shuffled complex evolution method and three criteria were applied to compare the observed and simulated hydrographs. The tendencies of the variations of the parameters with their corresponding imperviousness were established through regression analysis. Ten cases were used to examine the established equations of the parameters and impervious covers. Finally, the design flood routines of various return periods were furnished through use of approaches containing a design storm, block kriging, the SCS model, and a rainfall‐runoff model with established functional relationships. These simulated flood hydrographs were used to compare and understand the past, present, and future hydrological conditions of the watershed studied. In the research results, the time to peak of flood hydrographs for various storms was diminished approximately from 11 h to 6 h in different decrements, whereas peak flow increased respectively from 127 m3 s−1 to 629 m3 s−1 for different storm intensities. In addition, this study provides a design diagram for the peak flow ratio to help engineers and designers to construct hydraulic structures efficiently and prevent possible damage to human life and property. Copyright © 2007 John Wiley & Sons, Ltd.