Hydrological Method to Evaluate Environmental Flow (Case Study: Gharasou River, Ardabil)
Water flow management is one of the most important parts of river engineering. Non-uniformity distribution of rainfall and various flow demand with unreasonable flow management will be caused destroyed of river ecosystem. Then, it is very serious to determine ecosystem flow requirement. In this paper, Flow duration curve indices method which has hydrological based was used to evaluate environmental flow in Gharasou River, Ardabil, Iran. Using flow duration curve, Q90 and Q95 for different return periods were calculated. Their magnitude were determined as 1-day, 3-day, 7-day and 30 day. According the second method, hydraulic alteration indices often had low and medium range. In order to maintain river at an acceptable ecological condition, minimum daily discharge of index Q95 is 0.7 m3.s-1.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1099176Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1970
 N.L. Poff, J.D. Allan, M.B. Bain, J.R. Karr, K.L. Prestegaard, B.D. Richeter, R.E. Sparks, and J.C. Stromberg. “The Natural flow regime: a paradigm for river conservation and restoration”. Bioscience,1992,47 (11): 769-784.
 A. Arthington, S. Bunn, N. Pope, and R. Naiman, “The challenge of providing environmental flow rules to sustain river ecosystems”. Ecological Applications, 2006, 16(4), 1311-1318.
 R.E. Tharme. “A global perspective on environmental flow assessment: Emerging trends in the development and application of environmental flow methodologies for rivers”. River Research and Applications, 2003, 19(5-6), 397-441.
 P.J. Whiting. “Stream-flow necessary for environmental maintenance”.. Annual Review of Earth and Planetary Sciences, 2002, 30: 181-206.
 G.E.Petts“Water allocation to protect river ecosystems”. Regulated Rivers-Research & Management, 1996, 12:353-365.
 R.M. Vogel, N.M. Fennessey. “Flow duration curves. I. A new interpretation and confidence intervals. J. Water Resour. Plan. Manag., 1994, 120 (4): 485-504.
 J.C. Searcy. “Flow duration curves. United States Geological Survey”, Washington, DC, Water Supply Paper , 1959.
 J.W. Male, H. Ogawa. “Tradeoffs in water quality management”. J. Water Resour. Plan. Manag., 1984, ASCE 110 (4): 434–444.
 C.M. Alaouze. “Reservoir releases to uses with different reliability requirements”. Water Resour. Bull, 1989, 25 (6): 1163–1168.
 C.M. Alaouze. “Transferable water entitlements which satisfy heterogeneous risk preferences”. Aus. J. Agric. Econ., 1991, 35 (2): 197–208.
 C. Estes, J.F. Osborn. “Review and analysis of methods for quantifying instream flow requirements”. Water Resour. Bull., 1986, 22 (3), 389-398.
 R.M. Vogel, N.M. Fennessey. “Flow duration curves. II. A review of applications in water resource planning”. Water Resour. Bull., 1995, 31 (6), 1029–1039.