Assessment of environmental flow requirement effects at an estuary

Seyed Ehsan Fatemi, Freydon Vafaie, Johannes T.A. Bressers

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

This paper describes the application of dynamic system modelling to investigate the consequences for water supply of maintaining environmental flow requirements in the Gorganrud River Basin in Iran. In this study the output results of Vensim and Weap models were compared and found to match each other closely. However, for a specific scenario on the same computer, Vensim was more than 100 times faster than Weap. Currently, about 55% of the time the Gorganrud Estuary is dry without any in-stream environmental flow, causing grave environmental problems, particularly in relation to fish habitat. If the reservoirs are operated to maintain environmental flow requirements, there is less than 10% supply–demand deficit for agricultural uses but flows are maintained to the estuary throughout the year at about 1 m3/s, which benefits the river ecosystem; in addition there are flood risk management benefits about 35% of the time. Accepting these minor deficits and maintaining the environmental flow requirements at the Gorganrud Estuary thus achieves a valuable trade-off.
Original languageEnglish
Pages (from-to)411-421
JournalProceedings of the Institution of Civil Engineers. Water management
Volume166
Issue number8
DOIs
Publication statusPublished - 2013

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estuary
trade-off
river basin
water supply
effect
ecosystem
habitat
fish
river
modeling

Keywords

  • IR-86853
  • METIS-297081

Cite this

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title = "Assessment of environmental flow requirement effects at an estuary",
abstract = "This paper describes the application of dynamic system modelling to investigate the consequences for water supply of maintaining environmental flow requirements in the Gorganrud River Basin in Iran. In this study the output results of Vensim and Weap models were compared and found to match each other closely. However, for a specific scenario on the same computer, Vensim was more than 100 times faster than Weap. Currently, about 55{\%} of the time the Gorganrud Estuary is dry without any in-stream environmental flow, causing grave environmental problems, particularly in relation to fish habitat. If the reservoirs are operated to maintain environmental flow requirements, there is less than 10{\%} supply–demand deficit for agricultural uses but flows are maintained to the estuary throughout the year at about 1 m3/s, which benefits the river ecosystem; in addition there are flood risk management benefits about 35{\%} of the time. Accepting these minor deficits and maintaining the environmental flow requirements at the Gorganrud Estuary thus achieves a valuable trade-off.",
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Assessment of environmental flow requirement effects at an estuary. / Fatemi, Seyed Ehsan; Vafaie, Freydon; Bressers, Johannes T.A.

In: Proceedings of the Institution of Civil Engineers. Water management, Vol. 166, No. 8, 2013, p. 411-421.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Fatemi, Seyed Ehsan

AU - Vafaie, Freydon

AU - Bressers, Johannes T.A.

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AB - This paper describes the application of dynamic system modelling to investigate the consequences for water supply of maintaining environmental flow requirements in the Gorganrud River Basin in Iran. In this study the output results of Vensim and Weap models were compared and found to match each other closely. However, for a specific scenario on the same computer, Vensim was more than 100 times faster than Weap. Currently, about 55% of the time the Gorganrud Estuary is dry without any in-stream environmental flow, causing grave environmental problems, particularly in relation to fish habitat. If the reservoirs are operated to maintain environmental flow requirements, there is less than 10% supply–demand deficit for agricultural uses but flows are maintained to the estuary throughout the year at about 1 m3/s, which benefits the river ecosystem; in addition there are flood risk management benefits about 35% of the time. Accepting these minor deficits and maintaining the environmental flow requirements at the Gorganrud Estuary thus achieves a valuable trade-off.

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