Hydrological Alteration Assessment by Histogram Comparison Approach: A Case Study of Erdu River Basin, China

Huang, Xianfeng; Suwal, Naresh; Jia, Fan; Pandey, Kamal Prasad; Jia, Yongle

doi:10.2112/si93-020.1

Cited by 10 publications

(4 citation statements)

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“…NFR of many rivers worldwide had been altered by anthropogenic activities such as diversions and impoundment work [5,6,44]. For the rivers with limited data, time, and funding, the hydrological methods are the best method to allocate e-flows.…”

Section: Discussionmentioning

confidence: 99%

Environmental Flows Assessment in Nepal: The Case of Kaligandaki River

et al. 2020

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Environmental flow assessments (e-flows) are relatively new practices, especially in developing countries such as Nepal. This study presents a comprehensive analysis of the influence of hydrologically based e-flow methods in the natural flow regime. The study used different hydrological-based methods, namely, the Global Environmental Flow Calculator, the Tennant method, the flow duration curve method, the dynamic method, the mean annual flow method, and the annual distribution method to allocate e-flows in the Kaligandaki River. The most common practice for setting e-flows consists of allocating a specific percentage of mean annual flow or portion of flow derived from specific percentiles of the flow duration curve. However, e-flow releases should mimic the river’s intra-annual variability to meet the specific ecological function at different river trophic levels and in different periods over a year covering biotas life stages. The suitability of the methods was analyzed using the Indicators of Hydrological Alterations and e-flows components. The annual distribution method and the 30%Q-D (30% of daily discharge) methods showed a low alteration at the five global indexes for each group of Indicators of Hydrological Alterations and e-flows components, which allowed us to conclude that these methods are superior to the other methods. Hence, the study results concluded that 30%Q-D and annual distribution methods are more suitable for the e-flows implementation to meet the riverine ecosystem’s annual dynamic demand to maintain the river’s health. This case study can be used as a guideline to allocate e-flows in the Kaligandaki River, particularly for small hydropower plants.

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Section: Discussionmentioning

confidence: 99%

Environmental Flows Assessment in Nepal: The Case of Kaligandaki River

et al. 2020

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“…The IHA values of each indicator for each hydrological year are calculated according to the mathematical formulation mentioned in the study of Barbalin and Kuspilić (2014) and the results were used to calculate the hydrological alteration using the histogram comparison approach. The mathematical formulation of hydrological alteration indices is given below (Huang, Suwal, Fan, Pandey, & Jia, 2019). Rising rates: Average or median of all positive differences between consecutive daily values Drop rate: Mean or median of all negative differences between consecutive daily values Number of hydrological inversions managed such that the annual values of each IHA parameter are included within the range of natural variations of that parameter.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of extreme flow characteristics in the Casamance watershed upstream of Kolda using the IHA/RVA method

Sadio,

Faye

2023

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Understanding water availability is essential for the development and management of water resources, as well as for designing interventions for river health. Climate change/variability impacts the hydrology of a river system, which subsequently affects human and ecological health by altering the structure and function of the aquatic ecosystem. This study therefore aims to assess water availability and river health according to current and future climate scenarios in the Casamance watershed upstream of Kolda. Climate change is expected to increase hydrologic alterations from low (currently) to high (in the future), as revealed by the Indicators of Hydrologic Alteration (IHA) tool. Average annual water availability decreased, varying seasonally, and seasonal trends followed annual trends under Shared Socioeconomic Pathways (SSP) scenarios. In the basin, negative developments in minimum and maximum annual conditions are generally decreasing over the future period, compared to the reference period (1985-2014), with the exception of the minimum flow rate over 7 and 30 days on SSP 126 and the minimum flow rate over 30 days and the maximum flow rate 1, 3 and 7 days on SSP 585. In this SSP 585 scenario, the Mann Kendall test on the minimum flow rate and the flow rate maximum indicate the most significant downward trend with a risk of error of 0.05, with a Kendall tau varying from -0.45 m3/s/year to - 0.05 m3/s/year. For the minimum flow parameters, Kolda station shows negative Hydrological Alteration (HA) values for the high RVA category, which results in a decrease in low flow.

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“…The HIA values of each indicator for each hydrological year are calculated according to the mathematical formulation (equations 1-12) mentioned in the study from Barbalic and Kuspilic (2014) and the results were used to calculate the hydrological alteration using the histogram comparison approach. The mathematical formulation of the hydrological weathering indices is given below (Huang et al, 2019).…”

Section: Number Of Hydrological Inversionsmentioning

confidence: 99%

Rainfall and Discharge Variability in the Senegal River Basin Based on the IHA/RVA

Faye

2023

IJSEI

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The hydrological regime of a river is a driving force of its ecosystem. The operation of dams and locks has significant impacts on the hydrological situation of rivers. The objective of this study was to study the change and variability of precipitation and hydrological data in the Senegal River basin and to assess the change in the discharge regime of the Senegal River caused by the operation of the Manantali hydroelectric dam. Based on the IHA (Indicators of Hydrologic Alteration), a range of variability of thirty-three hydrological parameters was calculated and the hydrological alteration associated with the functioning of the dam was quantified. Using the RVA (Range of Variability Approach) method, the hydrological alteration at the Bakel site was evaluated and showed the influence of the dam on the hydrological state. The results showed a strong influence of the dam on the hydrological regime. The fluvial eco-hydrological objectives calculated in this study can constitute certain support for the management of water resources and ecosystems of the Senegal River basin.

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Hydrological Alteration Assessment by Histogram Comparison Approach: A Case Study of Erdu River Basin, China

Cited by 10 publications

References 0 publications

Environmental Flows Assessment in Nepal: The Case of Kaligandaki River

Environmental Flows Assessment in Nepal: The Case of Kaligandaki River

Evaluation of extreme flow characteristics in the Casamance watershed upstream of Kolda using the IHA/RVA method

Rainfall and Discharge Variability in the Senegal River Basin Based on the IHA/RVA

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