A revised range of variability approach considering the periodicity of hydrological indicators
A revised range of variability approach considering the periodicity of hydrological indicators
复制标题
考虑水文指标周期性的修订后的变异性方法范围
DOI：
10.1002/hyp.10106
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发表时间：
2014-12
影响因子：
3.2
通讯作者：
Jian Tang
中科院分区：
文献类型：
--
作者：
Pan Yang;Xin-An Yin;Zhi-Feng Yang;Jian Tang
综合评价河流水文变化是科学管理、保护和修复河流的前提。基于水文变化指标的变程法是一种广泛应用的水文变化评价方法。然而，RVA只考虑每个IHA的频率，忽略了这些IHA同样重要的时间顺序。IHA事件的周期性可以反映IHA事件发生的先后顺序。在RVA的基础上，本研究提出了一个修正的RVA，它同时考虑了IHA的频率和周期性。在RVA中，首先确定每一个IHA的周期时间，然后通过比较IHA前后的周期时间来计算河流流量的周期性变化（P），最后将P和传统RVA中的频率变化（D）合并为一个单一的指标（H）来反映整个水文变化。西大洋（XDY）水库和重新安排流量的案例研究表明，传统的RVA低估了水文变化，因为它忽视了周期性的变化。与传统的RVA及其替代方法相比，修正后的RVA能更全面地反映人为和自然因素对水文变化的影响。因此，将该方法应用于水资源评价和管理中，可以更好地保护生态系统。版权所有© 2013约翰威利父子有限公司.
Comprehensively assessing the hydrological alteration of river flows is a prerequisite for the scientific management, protection, and restoration of rivers. The range of variability approach (RVA), which is based on indicators of hydrological alteration (IHAs), is a widely used method to evaluate hydrological alteration. However, the RVA only considers the frequency of each IHA, neglecting the equally important temporal order of these IHAs. The order of IHA event can be reflected by its periodicity. On the basis of the RVA, in this study, we propose a revised RVA that considers both the frequency and periodicity of IHAs. In the revised RVA, first, the periodic time of each IHA is identified; next, the periodicity alteration (P) of river flow is calculated by comparing the periodic times of the pre‐impact‐period and post‐impact‐period IHAs; finally, P and the frequency alteration(D) in traditional RVA are incorporated into a single index (H) to reflect the overall hydrological alteration. A case study of the Xi Dayang (XDY) Reservoir and rearranged flow suggests that the traditional RVA underestimates hydrological alterations because it neglects the alteration of periodicity. Compared with the traditional RVA and its alternatives, the revised RVA could give a more comprehensive representation of hydrological alteration caused by human and nature impacts. Thus, better protection of an ecosystem could be obtained by applying this method in the evaluation and management of water resources. Copyright © 2013 John Wiley & Sons, Ltd.
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影响因子：
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通讯作者：
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