A revised range of variability approach considering the periodicity of hydrological indicators

Yang, Peiyan; Yin, Xia; Zhang, Yang; Tang, Jian

doi:10.1002/hyp.10106

Cited by 25 publications

(9 citation statements)

References 43 publications

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“…The Range of Variability Approach (RVA), proposed by Richter et al . 16 , is a widely used approach for quantitatively assessing the alteration of flow regime by comparing frequency distributions of IHA parameters during the pre-impact and post-impact 17 – 20 . The river managers try to evaluate potential hydrologic alterations within a targeted range which is related to the natural range of variability in parameters.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Assessment of Hydrological Alteration Caused by Irrigation Projects in the Tarim River basin, China

Xue

Zhang

Yang

et al. 2017

Sci Rep

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The Tarim River is the longest inland river at an arid area in China. Deterioration in its ecohydrological system has received much attention world widely. This study presents quantitative assessment of hydrological alterations in the hydrological regime of the Tarim River caused by reservoir irrigation and channel irrigation over a period of over a half century. The improved indicators of hydrologic alteration and range of variability approach were applied to the daily flow rates at the two representative hydrological stations. Our study shows that the annual extreme water conditions (1-, 3-, 7-day annual minimum and extreme low timing) have been altered, compared with the pre-impact period. The average flow rate in July, the 30-day annual maximum flow rates, the date for the maximum rate, the rise rate, and the fall rate show a significant decreasing trend. The improved overall degree of hydrological alteration for the two stations are approximately 68.7% and 61.8%, suggesting a high degree of alteration. This study greatly improved our understanding of impacts of irrigations on the ecohydrological characteristics in the Tarim River.

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Section: Introductionmentioning

confidence: 99%

Quantitative Assessment of Hydrological Alteration Caused by Irrigation Projects in the Tarim River basin, China

Xue

Zhang

Yang

et al. 2017

Sci Rep

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“…The range of variability approach (RVA) is the most widely used multivariable approach for the assessment of flow regime alteration (Richter et al, 1996(Richter et al, , 1997(Richter et al, , 1998Shiau and Wu, 2007;Yin and Yang, 2011;Yin et al, 2012;Belmar et al, 2013). And many revised versions of RVA are proposed to improve the performance since its origin in 1996 (Suen and Eheart, 2006;Wu, 2007, 2008;Yin et al, 2012;Yang et al, 2014;Yin et al, 2015). For example, Shiau and Wu (2007) used three approaches to calculating the overall degree of hydrological alteration in RVAthe three-class, fuzzy-based, and overall-mean approaches.…”

Section: Introductionmentioning

confidence: 99%

A revised range of variability approach for the comprehensive assessment of the alteration of flow regime

Yin

Zhang

2016

Ecological Engineering

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Assessment of flow regime alteration is significant for the scientific protection and restoration of rivers. The range of variability approach (RVA) and its revised versions, based on a suite of Indicators of Hydrological Alteration (IHA), have been widely used for flow regime alteration assessment. In these methods, the IHA of each specific year are treated separately, and their individual alterations are used to reflect the alteration of flow regime. However, it is known that one hydrological year is an important hydrological period, and the alteration of inner characteristics of one hydrological year (ICOHY), collectively characterized by the 32 IHA values of the year, can also lead to serious ecological degradation of rivers. In other words, treating the 32 IHA individually and separately in RVA and its revisions can not reflect the alteration of ICOHY. To overcome this limitation, a revised RVA is proposed. In the revised method, the 32 IHA values for each specific year are considered as a set, and the alteration of the set (SA) is measured by the set pair analyses method. The assessment of individual alteration (IA) of each IHA is carried out according to RVA. SA and IA are incorporated into a single index to reflect the overall flow regime alteration (OA). The proposed method is applied to a case study of the Xi Dayang Reservoir in China to test its effectiveness. The results suggest that the RVA underestimates the alteration degree and that the new method could give a more comprehensive assessment.

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“…However, all these methods do not consider the temporal order of each IHA, which is also significantly important for an ecosystem . Therefore, Yang et al (2014) proposed a revised RVA that considers both frequency and periodicity calculated using maximum entropy spectral analysis.…”

Section: Introductionmentioning

confidence: 99%

“…However, the study by Yang et al (2014) did not consider the trend and symmetry of each IHA. Moreover, one major limitation of this revised RVA is due to the uncertainty in periodic time identification processes.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, one major limitation of this revised RVA is due to the uncertainty in periodic time identification processes. Accordingly, Yang et al (2014) suggested that relatively better periodic time identification methods must be developed in the future to improve the applicability of this method. Therefore, more indices are required to more synthetically evaluate the alteration of each IHA parameter.…”

Section: Introductionmentioning

confidence: 99%

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Considering the Order and Symmetry to Improve the Traditional RVA for Evaluation of Hydrologic Alteration of River Systems

Lin

Liu

et al. 2016

Water Resour Manage

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Hydrologic alteration is one of the key factors influencing the aquatic health of a river basin, particularly that of highly fragmented rivers. In this study, we propose an improved range of variability approach (RVA) by considering the order and symmetry of indicators of hydrologic alteration (IHA) to comprehensively assess the hydrologic alteration of river flows. Three indices, i.e., index for the alteration of periodicity, index for the alteration of trend, and index for the alteration of symmetry, were used to improve the traditional RVA for evaluation of hydrologic alteration of river systems. Two main control stations located in the upper Pearl River Delta, the Sanshui and Makou stations, were selected as case studies. The results show that (1) each evaluation index reflects only partial characteristics of the alteration of each IHA parameter, which vary over the stations, and (2) the traditional RVA underestimates hydrologic alteration, because the trend and periodicity components and symmetry in the temporal order of IHAs were significantly altered, while the results of the traditional RVA varied slightly for some IHAs, e.g., the multiday maximum flow at the Sanshui station and monthly flows for May, July, and September at the Makou station. These indicated that, by considering frequency, trend, periodicity, and symmetry, the improved RVA provides a more accurate quantitative evaluation of ecological flow alteration.

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A revised range of variability approach considering the periodicity of hydrological indicators

Cited by 25 publications

References 43 publications

Quantitative Assessment of Hydrological Alteration Caused by Irrigation Projects in the Tarim River basin, China

Quantitative Assessment of Hydrological Alteration Caused by Irrigation Projects in the Tarim River basin, China

A revised range of variability approach for the comprehensive assessment of the alteration of flow regime

Considering the Order and Symmetry to Improve the Traditional RVA for Evaluation of Hydrologic Alteration of River Systems

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