A Histogram Matching Approach for assessment of flow regime alteration: application to environmental flow optimization
A Histogram Matching Approach for assessment of flow regime alteration: application to environmental flow optimization
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DOI：
10.1002/rra.1102
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发表时间：
2008-09
影响因子：
2.2
通讯作者：
J. Shiau;Fu‐Chun Wu
中科院分区：
文献类型：
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作者：
J. Shiau;Fu‐Chun Wu
在本文中，我们提出了一个直方图匹配方法（HMA）的流态变化的评估。HMA使用直方图相异性的程度作为影响评估的度量标准，其基于由指定的相似性矩阵加权的撞击前和撞击后直方图的频率向量之间的二次型距离。HMA加上一个聚合的多目标优化遗传算法，并应用于高屏导流堰（台湾）的案例研究，以确定最佳的环境流量计划，平衡生态系统和人类需求的目标。本研究涉及两个关键问题。首先，我们比较了HMA和现有的变异范围方法（RVA）的性能。其次，我们采用了三种类型的相似性函数，以调查他们的影响的结果HMA。结果表明，HMA始终优于RVA在保持自然流动的变化，无论使用什么类型的相似函数。没有一种类型的相似性函数可以同时最好地保留32个水文蚀变指标（IHA）的自然模式。对于供水可靠性至关重要的情况，建议使用脉冲相似性，因为它可以确保最小的供水赤字。然而，如果供水可靠性的轻微下降可能被忽略，则建议采用线性相似，因为它通常会导致撞击后的水流最令人满意地类似于自然水流状态。版权所有© 2008约翰威利父子有限公司.
In this paper we present a Histogram Matching Approach (HMA) for assessment of the flow regime alteration. The HMA uses the degree of histogram dissimilarity as a metric for impact assessment, which is based on the quadratic‐form distance between the frequency vectors of the pre‐ and post‐impact histograms weighted by a specified similarity matrix. The HMA is coupled with an aggregated multiobjective optimization genetic algorithm and applied to a case study on the Kaoping diversion weir (Taiwan) for determining the optimal environmental flow scheme that balances the ecosystem and human needs objectives. Two key issues are addressed in this study. First, we compare the performances of the HMA and existing Range of Variability Approach (RVA). Second, we employ three types of similarity function to investigate their effect on the outcomes of the HMA. The results reveal that the HMA consistently outperforms the RVA in preserving the natural flow variability regardless of what type of similarity function is used. No single type of similarity function can be found that would simultaneously best preserve the natural patterns of 32 Indicators of Hydrologic Alteration (IHA). For the situations where the water‐supply reliability is of critical concern, the pulse similarity is recommended because it would assure the smallest water‐supply deficit. If, however, minor degradation in the water‐supply reliability may be overlooked, the linear similarity is suggested because it would generally result in the post‐impact flows that most satisfactorily resemble to the natural flow regime. Copyright © 2008 John Wiley & Sons, Ltd.