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<p>Evaluating the impact of dam construction on river flow regimes is essential for understanding how such interventions alter the natural hydrological balance and affect downstream ecosystems. This research examines the hydrologic regime modifications in the Zarrineh River below the Shahid Kazemi Dam, emphasizing changes in the river’s flow regime following the dam’s construction. The research area is located in the Zarrineh River basin, with data collected from the Sarighamish Hydrometric Station over a 60-year period (1955–2017). The analysis employs IHA tools and Range of Variability Approach approach, categorizing the river’s flow characteristics into five main features: duration, magnitude, timing, rate of change, and frequency. The results reveal significant hydrological shifts in the Zarrineh River post-dam including a decrease in flow during wet seasons, particularly in March, and an increase in low flow pulses during dry months, such as June to December. The monthly flow in October decreased from 4.10 to 21.60 to 1.99–4.84, with a reduction of 3.11 in the high range. The 1-day minimum flow reduced from 0.84 to 0.40–1.22, and the 1-day maximum flow dropped from 340.00 to 299.30, reflecting the dam’s impact on the river’s flow dynamics. The dam has altered the seasonal flow patterns, with a reduction in maximum flow values, especially during high-flow periods, and an increase in minimum flows. Additionally, the number of low pulse events decreased, and the duration of low pulses shortened, while high pulse duration increased. The dam influenced the timing and characteristics of river flows, delaying the occurrence of minimum flows to later in the year. Additionally, it reduced the duration of low pulses by approximately 20 days, altering the river’s flow dynamics. These hydrological changes indicate the Shahid Kazemi Dam’s role in regulating river flow, significantly impacting water availability and the seasonal discharge pattern. This research highlights the ecological implications of flow regulation for downstream ecosystems, emphasizing the importance of considering hydrological alterations in water management practices. The findings contribute to understanding the broader effects of dam operations on river systems, providing insights into the long-term management of water resources in regulated rivers.</p>

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Change in Hydrological Flow Indicators of a Perennial River Due to Dam Construction Using the Range of Variability Approach

  • 期刊论文

  • 发表日期：

    2026年3月10日

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  • Leyla Babaie,
  • Hirad Abghari,
  • Raoof Mostafazadeh

摘要

Evaluating the impact of dam construction on river flow regimes is essential for understanding how such interventions alter the natural hydrological balance and affect downstream ecosystems. This research examines the hydrologic regime modifications in the Zarrineh River below the Shahid Kazemi Dam, emphasizing changes in the river’s flow regime following the dam’s construction. The research area is located in the Zarrineh River basin, with data collected from the Sarighamish Hydrometric Station over a 60-year period (1955–2017). The analysis employs IHA tools and Range of Variability Approach approach, categorizing the river’s flow characteristics into five main features: duration, magnitude, timing, rate of change, and frequency. The results reveal significant hydrological shifts in the Zarrineh River post-dam including a decrease in flow during wet seasons, particularly in March, and an increase in low flow pulses during dry months, such as June to December. The monthly flow in October decreased from 4.10 to 21.60 to 1.99–4.84, with a reduction of 3.11 in the high range. The 1-day minimum flow reduced from 0.84 to 0.40–1.22, and the 1-day maximum flow dropped from 340.00 to 299.30, reflecting the dam’s impact on the river’s flow dynamics. The dam has altered the seasonal flow patterns, with a reduction in maximum flow values, especially during high-flow periods, and an increase in minimum flows. Additionally, the number of low pulse events decreased, and the duration of low pulses shortened, while high pulse duration increased. The dam influenced the timing and characteristics of river flows, delaying the occurrence of minimum flows to later in the year. Additionally, it reduced the duration of low pulses by approximately 20 days, altering the river’s flow dynamics. These hydrological changes indicate the Shahid Kazemi Dam’s role in regulating river flow, significantly impacting water availability and the seasonal discharge pattern. This research highlights the ecological implications of flow regulation for downstream ecosystems, emphasizing the importance of considering hydrological alterations in water management practices. The findings contribute to understanding the broader effects of dam operations on river systems, providing insights into the long-term management of water resources in regulated rivers.