A revised range of variability approach considering the morphological alteration of hydrological indicators

Zheng, Xin; Yang, Tao; Cui, Tong; Xu, Chong‐Yu; Zhou, Xudong; Li, Zhen‐Ya; Shi, Pengfei; Qin, Youwei

doi:10.1007/s00477-020-01926-6

Cited by 16 publications

(10 citation statements)

References 62 publications

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“…The test for mutation points is first observed by the Mann-Kendall mutation test to discover whether the two curves UF, UB intersect at a given confidence level α, and then the mean difference t-test is used to further corroborate and discover whether the mutation year meets the mutability test need. For detailed steps refer to the literature [16].…”

Section: Analysis Of the Average Annual Water Temperature Variation Trend And The Mutation Testmentioning

confidence: 99%

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Hydrothermal Regime Variation and Ecological Effects on Fish Reproduction in the Yangtze River

Guo

Dou

et al. 2021

IJERPH

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Water temperature, as one of the important water environment impact factors, has a significant impact on the survival and development of aquatic organisms. We selected water temperature data (1959–2017) from four key hydrological stations in the Yangtze River: Cuntan, Yichang, Hankou, and Datong. We analyzed the characteristics and variability of the Yangtze River hydrothermal regime by the Mann-Kendall method, wavelet analysis, and by the IHA-RVA method to analyze hydrothermal regime variations of the Yangtze River, and the response mechanisms of fish to variations in hydrothermal regimes were explored. The results show that (1) The annual average water temperature of the Yangtze River is warming, and Cuntan Station, Yichang Station, Hankou Station, and Datong Station have a sudden increase in temperature in 2002, 1995, 2003, and 2004, and the periodicity analysis demonstrates that Cuntan, Yichang, and Datong stations all have main periods of 24~32 years; (2) The overall variations of 32 hydrothermal indicators at Cuntan Station and Yichang Station reached 65% and 61%, which are close to the height variation; (3) With the construction of the Three Gorges Dam, the stagnant cooling effect caused the arrival date of the upper reproduction water temperature of “The four major fish species” to be delayed by about 23 days, and the stagnant heat effect caused the arrival date of the Chinese sturgeon reproduction upper limit water temperature to be delayed by about 30 days.

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Section: Analysis Of the Average Annual Water Temperature Variation Trend And The Mutation Testmentioning

confidence: 99%

“…Range of Variability Approach and indicator of Hydrologic Alteration was selected to establish the evaluation of ecological hydrological index and quantify the variation degree of river hydrological regime [16,17], calculated by the following equation:…”

Section: Analysis Of the Degree Of Water Temperature Variationmentioning

confidence: 99%

Hydrothermal Regime Variation and Ecological Effects on Fish Reproduction in the Yangtze River

Guo

Dou

et al. 2021

IJERPH

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“…All of the above alteration assessment methods do not consider the morphological characteristics of IHAs which are crucial from the perspective of hydro‐ecology. Zheng et al (2021) connected the magnitude and location (i.e., time order) of the samples through the Hasse matrix, and proposed the Revised Range of Variability Approach (RRVA), which indicates the conjoint changes in temporal sequence and indicator frequency to assess hydrologic regime comprehensively. The RRVA method focuses on the morphology of IHAs in time order, that is, how IHAs vary with time series.…”

Section: Introductionmentioning

confidence: 99%

A novel Joint Probability Density Difference Approach for assessing the alteration of hydrologic regime

Zhong,

Guo,

Wang

et al. 2024

River Research & Apps

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The construction and operation of upstream reservoirs have significantly altered downstream hydrologic regime. Appropriate and quantifiable assessment method for the alteration of hydrologic regime is considerably vital and emergent for ecological protection and restoration. The Range of Variability Approach (RVA) and modified RVA methods have been widely used in practice to assess the hydrological alteration. However, these methods have failed to concurrently describe the distribution of indicator and morphological features in detail, which might inevitably lead to the misjudgment of alteration. This paper proposes a Joint Probability Density Difference Approach (JPDDA) method to address the major drawbacks of these previous methods with the introduction of Gaussian Kernel Density Estimation (KDE) and copula function. The annual average flow is selected as the reference variable to construct a proper joint probability density function between itself and other hydrological alteration indicators. The JPDDA method could describe the marginal distribution in detail through Gaussian KDE and also link the morphological features with copula function. Along with pervious methods, the hydrological alterations at Yichang hydrological station, Yangtze River are estimated based on the measured flow from 1949 to 2022. It is shown that the hydrologic regime has suffered from a moderate or even heavy alteration under the influence of massive upstream cascade reservoirs, and the JPDDA outperforms the other methods in terms of rationality and stability for practical assessments. Thus, the proposed JPDDA method is strongly advised to handle the hydrological alteration and could provide a reasonable reference for ecological operation.

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“…Peng, et al 11 showed that the reduction in peak flows caused by the dams would result in the failure of downstream fish to spawn. Given this challenge, quantitative assessment of changes in characteristic hydrologic parameters 16 and analysis of ecological flows required by the fish spawning process 2 , 11 , 17 are essential for river habitat restoration.…”

Section: Introductionmentioning

confidence: 99%

“…The final step is to assess the variability of hydrologic indicators. Previous studies have shown that the range of variability approach (RVA) in combination with IHAs can successfully and powerfully reveal flow regime changes 16 . However, they ignored the frequency of the natural flow, which was already altered 29 .…”

Section: Introductionmentioning

confidence: 99%

Identification and restoration of hydrological processes alteration during the fish spawning period

Yang

Zhao

Zhang³

et al. 2023

Sci Rep

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The hydrological processes play an important role in stimulating fish spawning behavior. Changes in the natural hydrological processes will alter the populations and distribution of fish, which may have a negative impact on the native aquatic organisms. The aim of this study is to identify the alteration of the water rising process during the fish spawning period and to construct an ecological flow optimization model to restore the water rising conditions for fish reproduction. The Mann–Kendall test and the sliding t-test were used to detect the mutation year of the mean daily flow data sets in the fish spawning period in each monitoring year. Then the data sets can be divided into pre-altered and post-altered periods. The water rising process was characterized by the water rising processes count, the duration, the daily flow increase rate, the date of the water rising process, and the initial water rising flow. The changes in hydrological processes in the middle reaches of the Yangtze River were investigated by comparing the post-altered and pre-altered characteristic parameters. Furthermore, we integrated the statistical values of the five characteristic parameters in pre-altered into an ecological flow optimization model to simulate the natural water rising processes for the spawning of the Four Major Chinese Carps (FMCC) and Chinese Sturgeon (CS). The analysis showed that after the hydrological mutation year, the duration and the initial water rising flow in the FMCC spawning season were increased, with hydrological alteration degrees of 63.10% and 70.16%, respectively; however, the daily flow increase rate was significantly decreased, with hydrological alteration of 86.50%. During the CS spawning season, the water rising processes count and the initial water rising flow were dramatically altered parameters, with hydrological alteration degrees of 50.86% and 83.27%, respectively. The former parameter increased, but the latter decreased significantly in the post-altered period. To induce the spawning activity of FMCC and CS, appropriate ecological flows and hydrological parameters were proposed. These results showed that during the spawning seasons of FMCC and CS, the hydrological processes of the middle reaches of the Yangtze River changed significantly. Therefore, ecological flow must be ensured through ecological operation of upstream reservoirs to provide suitable spawning conditions in target fish spawning grounds.

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A revised range of variability approach considering the morphological alteration of hydrological indicators

Abstract: Li, and Youwei Qin. The methodology was proposed by Xin Zheng, Tong Cui and Tao Yang.

Cited by 16 publications

References 62 publications

Hydrothermal Regime Variation and Ecological Effects on Fish Reproduction in the Yangtze River

Hydrothermal Regime Variation and Ecological Effects on Fish Reproduction in the Yangtze River

A novel Joint Probability Density Difference Approach for assessing the alteration of hydrologic regime

Identification and restoration of hydrological processes alteration during the fish spawning period

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