LOW FLOW ANALYSIS IN ARID AND SEMI-ARID AREAS OF NORTHEASTERN OF KHORASAN RAZAVI PROVINCE

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HABIBNEJAD ROSHAN M.; EBRAHIMI M.; SOLAIMANI K.; VAFAKHAH M.

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Journal: JOURNAL OF WATERSHED MANAGEMENT RESEARCH Year:2010 | Volume:1 | Issue:1 Page(s): 44-58

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Title

LOW FLOW ANALYSIS IN ARID AND SEMI-ARID AREAS OF NORTHEASTERN OF KHORASAN RAZAVI PROVINCE

Author(s)

HABIBNEJAD ROSHAN M. | EBRAHIMI M. | SOLAIMANI K. | VAFAKHAH M. | Issue Writer Certificate

Keywords

HYDROLOGICAL DROUGHTQ2

LOW FLOWQ3

REGIONAL ANALYSISQ2

KHORASAN RAZAVIQ2

Abstract

Knowledge of frequency ratings of LOW FLOWs is important to understand the phenomenon due to damage producing effects of drought. LOW FLOW Analysis is a method of hydrologic estimation of drought. One of the methods in the regions without adequate data is the REGIONAL ANALYSIS of LOW FLOWs, based on real data and its results have the higher reliability coefficients. In this study, the suitable stations for analysis of these flows were selected, low annual flow series with duration of 7, 15 and 30 days were calculated, 8 statistical distributions functions were fitted with the data and the Log-Pearson Type II distribution was selected as the suitable regional distribution. Also 16 physiographical, climatic and geological parameters were determined for the selected watersheds. To choose the independent variables, factor analysis was used. The results showed that among 16 input parameters, the area, mean annual rainfall and percentage of permeable formation were the most important factors, which explain 79% of variance. Two homogeneous regions were recognized in the study area with cluster analysis and the two regions were completely separated by distinguishing analysis. The REGIONAL ANALYSIS of LOW FLOWs was carried out using step-wise regression and multiple regression methods for each homogeneous region and the whole study area, considering r factors of the area, mean annual rainfall and percentage of permeable formation. The LOW FLOW rates with duration of 7, 15 and 30 days and return periods of 2, 5, 10, 20 and 50 years were finally estimated. The study of the models showed that the models used for homogeneous regions have higher correlation coefficients and lower standard errors with respect to the models used for the whole area.

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APA: Copy

HABIBNEJAD ROSHAN, M., EBRAHIMI, M., SOLAIMANI, K., & VAFAKHAH, M.. (2010). LOW FLOW ANALYSIS IN ARID AND SEMI-ARID AREAS OF NORTHEASTERN OF KHORASAN RAZAVI PROVINCE. JOURNAL OF WATERSHED MANAGEMENT RESEARCH, 1(1), 44-58. SID. https://sid.ir/paper/230246/en

Vancouver: Copy

HABIBNEJAD ROSHAN M., EBRAHIMI M., SOLAIMANI K., VAFAKHAH M.. LOW FLOW ANALYSIS IN ARID AND SEMI-ARID AREAS OF NORTHEASTERN OF KHORASAN RAZAVI PROVINCE. JOURNAL OF WATERSHED MANAGEMENT RESEARCH[Internet]. 2010;1(1):44-58. Available from: https://sid.ir/paper/230246/en

IEEE: Copy

M. HABIBNEJAD ROSHAN, M. EBRAHIMI, K. SOLAIMANI, and M. VAFAKHAH, “LOW FLOW ANALYSIS IN ARID AND SEMI-ARID AREAS OF NORTHEASTERN OF KHORASAN RAZAVI PROVINCE,” JOURNAL OF WATERSHED MANAGEMENT RESEARCH, vol. 1, no. 1, pp. 44–58, 2010, [Online]. Available: https://sid.ir/paper/230246/en

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