Article,
Assessment of the environmental condition of mountainous streams in macrohabitat scale (Case Study: Delichai Stream in Tehran, Iran)
Journal of Biodiversity and Environmental Sciences (JBES), Vol. 6 (No. 1): p. 201-208 (January 2015)
Abstract
In the present research environmental condition of a mountainous stream in macro habitat scale is investigated, and Delichai mountainous stream is selected as the pattern stream for investigation. At first hydrological and hydraulic approaches in the study stream were investigated. In the next step, physical habitat in macro scale was evaluated. Based on the results in normal conditions 10% of mean annual flow (MAF) according to the Tennant criterion and also 25% of MAF determined in the region of Atlantic in Canada are not suitable for this type of stream. Theoretically, calculation of maximum curvature in wetted perimeter method will produce the best answer for environmental flow assessment considering the physical macro habitat. But scientifically this flow cannot be applicable in these streams. In the range of 80% to 100% of MAF, minimum habitat suitability condition will be created, if the restoration and rehabilitation habitat condition techniques in moderate level are used. If the stream has sensitive biologically condition (sensitive and endangered species), considering the 25% of MAF and extensive restoration projects with this flow is recommended.
