Investigation of Ecohydraulic Indices in Environmental Flow Regime and Habitat Suitability Simulation Analysis using River2D Model with Relying on the Restoration Ecological in Zarrin-Gol River

Document Type : Research Article

Authors

1 Water Resources Engineering, Water Engineering Department, College of Water and Soil Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

2 Associated Professor, Water Engineering Department, College of Water and Soil Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

3 Assistant Professor, Water Engineering Department, College of Water and Soil Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

Abstract

Environmental flow science is a current tool for assessing the outcome of changing the flow regime of aquatic ecosystems and providing a minimum flow of protection aquatic species. The purpose of this research is to provide the essentials in preparing the tools for the assessment and design of restoration and regeneration projects for Zarrin-Gol river habitats using ecohydraulic and hydromorphological indices based on the habitat suitability simulation. In this regard based on the research framework, after the field studies and the development of the habitat suitability model for the target species, the hydrodynamic simulation of the flow was carried out and eventually the ecological flow regime was extracted. The results showed that River2D model by connecting the flow requirement characteristics of C.Capoeta gracilis and using hydraulic and hydrological relations, would have the maximum and minimum flow regime required to maintain the Zarrin-Gol river ecosystem according to ecological needs in the months of April and October is estimated to order equivalent to 5.09 and 0.89 m3/s, with average 1.79  m3/s (equivalent 84 percent of natural stream of the river). Based on the results of this study, in environmental studies of water resources and river engineering, the two-dimensional hydrodynamic River2D model is able to simulate flow, modeling habitat suitability of target species and predict the dynamics of habitats to protect the proper habitat of fish in river ecosystems. The calculation of the environmental flow can be an appropriate estimate for the ecological response of the river to the morphological changes caused by hydrological and hydrological processes.

Keywords

Main Subjects

References

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Iranian journal of Ecohydrology
Volume 6, Issue 1
April 2019
Pages 205-222

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History

  • Receive Date: 23 August 2018
  • Revise Date: 20 January 2019
  • Accept Date: 20 January 2019
  • First Publish Date: 21 March 2019
  • Publish Date: 21 March 2019

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