AN EVALUATION OF REGIONAL LOW-FLOW FREQUENCY ANALYSIS METHODS IN ARID AND SEMI-ARID REGIONS

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ZEHTABIAN GHOLAM REZA; NOSRATI K.; SHAHBAZI A.

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Journal: Desert Year:2004 | Volume:9 | Issue:1 Page(s): 111-124

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Title

AN EVALUATION OF REGIONAL LOW-FLOW FREQUENCY ANALYSIS METHODS IN ARID AND SEMI-ARID REGIONS

Author(s)

ZEHTABIAN GHOLAM REZA | NOSRATI K. | SHAHBAZI A. | Issue Writer Certificate

Keywords

LOW FLOWQ3

HYDROLOGICAL DROUGHTQ2

HOMOGENE REGIONSQ2

MULTIVARIATE REGRESSIONQ4

LOW FLOW INDEX METHODSQ4

Abstract

Analysis of LOW FLOW frequency indices is an applied method in studying HYDROLOGICAL DROUGHT. Annual LOW FLOWs were defined as the lowest mean daily flow with in continuous period of7, 15,30 and 60 days in a year. Estimation of LOW FLOW is often needed at catchments that are not equipped with gauging stations, therefore regional analysis methods are often used. In this study, suitable gauging stations in Atrak river basin were selected. After determining the annual LOW FLOW series with a duration of 7, 15,30 and 60 days, 8 probability distributions were fitted to the data set. Log-Pearson was selected as a suitable regional distribution for LOW FLOW frequency analysis in the study area. Regional homogeneity of the study area was assessed through cluster analysis was two homogeny areas being regionalized. Regional analysis was performed for two methods of MULTIVARIATE REGRESSION and LOW FLOW index method. Results showed that MULTIVARIATE REGRESSION method is a better measure than LOW FLOW index method. Finally, using the regional models, LOW FLOWs with return periods in the homogenous regions were estimated. Forecasting maps of drought with return periods of 2 and 10 years were drawn. Results showed that the more the number of return periods of drought, the more the drought severity. In total, observed return periods indicated that the eastern and central parts of the watershed experienced a more severe drought than the other locations. These regions require more attention in the future water resources studies.

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APA: Copy

ZEHTABIAN, GHOLAM REZA, NOSRATI, K., & SHAHBAZI, A.. (2004). AN EVALUATION OF REGIONAL LOW-FLOW FREQUENCY ANALYSIS METHODS IN ARID AND SEMI-ARID REGIONS. DESERT (BIABAN), 9(1), 111-124. SID. https://sid.ir/paper/5323/en

Vancouver: Copy

ZEHTABIAN GHOLAM REZA, NOSRATI K., SHAHBAZI A.. AN EVALUATION OF REGIONAL LOW-FLOW FREQUENCY ANALYSIS METHODS IN ARID AND SEMI-ARID REGIONS. DESERT (BIABAN)[Internet]. 2004;9(1):111-124. Available from: https://sid.ir/paper/5323/en

IEEE: Copy

GHOLAM REZA ZEHTABIAN, K. NOSRATI, and A. SHAHBAZI, “AN EVALUATION OF REGIONAL LOW-FLOW FREQUENCY ANALYSIS METHODS IN ARID AND SEMI-ARID REGIONS,” DESERT (BIABAN), vol. 9, no. 1, pp. 111–124, 2004, [Online]. Available: https://sid.ir/paper/5323/en

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