Development of Low Flow Duration-Frequency Curves by Hybrid Frequency Analysis

Orta, Selen; Aksoy, Hafzullah

doi:10.1007/s11269-022-03095-3

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…The flow duration curve indicates flow availability and the percentage of the equal or exceedance over a specific period in that river basin [57][58][59]. FDCs have been widely used in almost all types (i.e., mountainous, cold regions, semi-arid to arid regions) of river basins for hydrological analysis [60][61][62][63][64][65][66]. Generally, any FDC graph contains the flow on the Y-axis, whereas the X-axis includes the number of days exceedance from a particular flow-relative percentile flow [57,58].…”

Section: Flow Duration Curves (Fdc)mentioning

confidence: 99%

Transboundary River Water Availability to Ravi Riverfront under Changing Climate: A Step towards Sustainable Development

et al. 2023

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The Indus Water Treaty allocated the water of the Ravi River to India, and India constructed the Thein Dam on the Ravi River. This study investigates the water availability of the Ravi Riverfront for both pre-dam and post-dam scenarios augmented with pre-flood, flood, and post-flood sub-scenarios. The study also investigates river water availability for low and high magnitudes (Flow Duration Curves) and its linkages with climate change. The modified Mann–Kendall, Sen’s slope estimator, and Pearson correlation were used to investigate the river flows. It was found that there is a remarkable decrease in the river water by −36% of annual mean flows as compared to the pre-dam scenario. However, during the flood season, it was −32% at the riverfront upstream (Ravi Syphon Gauge). The reduction in water volume was found as 2.13 Million Acre Feet (MAF) and 1.03 MAF for maximum and mean, respectively, in the Rabi (Winter) season, and 4.07 MAF and 2.76 MAF for max and mean, respectively, in the Kharif (Summer) season. It was also revealed that 180–750 cusecs of water would be available or exceeded for 90% to 99% of the time at Ravi Riverfront during the flood season. The high flows were mainly controlled by temperature in the pre-dam scenario; presently, this water is stored in the Thein Dam reservoir. In contrast, the precipitation role is significant in the post-dam scenario, which means that the flows in the Ravi River are mainly due to base flow contributions and precipitation. This study is the first step in analyzing the river water availability of the Ravi Riverfront, which will ultimately address the associated problems and their solutions to decision-makers. Additionally, implementing an eco-friendly riverfront promotes urban sustainability in developed urban areas, such as Lahore City, and will lead to a comfortable and healthy lifestyle; this will only be possible with water availability in the Ravi Riverfront reach.

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Section: Flow Duration Curves (Fdc)mentioning

confidence: 99%

Transboundary River Water Availability to Ravi Riverfront under Changing Climate: A Step towards Sustainable Development

et al. 2023

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“…[40] determined the response of hydrological drought to meteorological drought in the Eastern Mediterranean Basin of Turkey; Ref. [41] developed low flow duration-frequency curves with hybrid frequency analysis; Ref. [42] determined frequency curves of high and low flows in intermittent river basins for hydrological analysis and hydraulic design.…”

Section: Introductionmentioning

confidence: 99%

Developing Regional Hydrological Drought Risk Models through Ordinary and Principal Component Regression Using Low-Flow Indexes in Susurluk Basin, Turkey

Gürler,

Anli,

Polat

2024

Water

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Susurluk Basin is among the basins that may be most affected by drought risk due to its agricultural, economic, and natural resources. In this study, regional hydrological drought risk models were developed for water supply systems in the Susurluk Basin, Turkey. Twenty-four flow observation sites with 25 years or more of data showing natural flow characteristics as much as possible were converted into daily flow data with Q7, Q15, Q30, and Q60 low-flow indexes. Regionalization was carried out by two-stage multivariate cluster and principal component analysis using the basins’ physical and hydrological characteristics and low-flow statistics, and two homogeneous regions were obtained due to the discordancy, heterogeneity, and goodness of fit tests, which are L-moment approaches. Regional models were performed with ordinary and principal component regression techniques using the physical and hydrological characteristics of the watersheds and regional low-flow frequency analysis. The cross-validation procedure results for ungauged basins show that ordinary regression models are more effective in the lowland first region. In contrast, principal component regression models are more suitable for the mountainous second region. This study’s findings, which are a first for the Susurluk Basin, will have important results in terms of agricultural water management in the region and will help the water authority in water allocation. To investigate whether human impact and climate change impact the prediction of hydrological drought, we recommend seasonal non-stationary frequency analysis with the addition of useful empirical hydrological drought indexes.

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“…Low flows and droughts are being studied from various points of view, e.g., statistical test and trend analysis [7][8][9][10], variations of flow duration and flow duration frequency analysis [11][12][13], and the use of indicators of hydrological alteration [14].…”

Section: Introductionmentioning

confidence: 99%

Changes in Selected Low-Flow Characteristics in the 2001–2015 Period Compared to the 1961–2000 Reference Period in Slovakia

Blaškovičová

Jeneiová

Melová

et al. 2022

Climate

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This research is focused on the assessment of drought on surface watercourses in Slovakia. Low-flow characteristics and their changes in the 2001–2015 period in comparison with the 1961–2000 reference period were evaluated at selected representative water-gauging stations. Two different methods were used to calculate the flow duration curves (FDCs): the standard method, based on mean daily discharge data series for the whole evaluated period in descending order, and the alternative method, based on first calculating the values of FDCs for each year of the assessed period and then averaging the corresponding percentile values. The changes were evaluated for selected percentiles of the FDCs (330-, 355-, and 364-day discharge). The number of days with the mean daily flow below the set limits and the seasonality of their occurrence were assessed. The results show significant changes in cases of both methods in the compared time periods, while differences in individual regions of Slovakia were also found. The weakness of the standard method is in allowing the values of the smallest quantiles to be influenced by a small number of long-lasting drought episodes. The alternative method eliminates the aforementioned shortcoming and could be used to determine the ecological flows in Slovakia.

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Development of Low Flow Duration-Frequency Curves by Hybrid Frequency Analysis

Cited by 4 publications

References 24 publications

Transboundary River Water Availability to Ravi Riverfront under Changing Climate: A Step towards Sustainable Development

Transboundary River Water Availability to Ravi Riverfront under Changing Climate: A Step towards Sustainable Development

Developing Regional Hydrological Drought Risk Models through Ordinary and Principal Component Regression Using Low-Flow Indexes in Susurluk Basin, Turkey

Changes in Selected Low-Flow Characteristics in the 2001–2015 Period Compared to the 1961–2000 Reference Period in Slovakia

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