A DETERMINATION OF AN APPROPRIATE MONTHLY WATER BALANCE IN SMALL WATERSHEDS OF IRAN (CASE STUDY: EASTERN AZARBAYEJAN AND NORTH OF KHORASAN)

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MAHDAVI M.; AZARAKHSHI M.

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Paper Information

Journal: IRANIAN JOURNAL OF NATURAL RESOURCES Year:2004 | Volume:57 | Issue:3 Page(s): 415-428

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Title

A DETERMINATION OF AN APPROPRIATE MONTHLY WATER BALANCE IN SMALL WATERSHEDS OF IRAN (CASE STUDY: EASTERN AZARBAYEJAN AND NORTH OF KHORASAN)

Author(s)

MAHDAVI M. | AZARAKHSHI M. | Issue Writer Certificate

Keywords

MONTHLY WATER BALANCEQ3

SMALL BASINQ4

PE TYPE MODELSQ4

AZARBAYEJANQ4

KHORASANQ4

Abstract

Monthly discharge is one of the most important factors to be considered in designs and hydrological works. Some basins are not equipped with needed hydrometric equipment. In such a case average monthly discharge could be estimated from regional MONTHLY WATER BALANCE models of representative basins. These models are of two types: P and PE. In P type the only input is precipitation and whereas PE type the input series are precipitation as well as potential evapotranspiration. In this study, PE TYPE MODELS were used in 12 basins in the semi-arid climate of AZARBAYEJAN as wellas North of KHORASAN province in Iran. Following collection of data in temperature, precipitation and average monthly discharge in these basins, the potential evapotranspiration was calculated using Thornthwait formula.Remaining parts of water balance equation including: Actual evapotranspiration, soil moisture supply of basin in each month and later months are estimated from Thornthwait model .Then, by regarding the logical relationship between parameters, the regression relationships between various parameters in water balance are established. The models are analysed at 5% confidence level. The results of the tstudent-test showed that difference between observed and estimated runoff, from models, wasnot significant and thus by using the MONTHLY WATER BALANCE models, the series for mean monthly discharge could be generated.

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APA: Copy

MAHDAVI, M., & AZARAKHSHI, M.. (2004). A DETERMINATION OF AN APPROPRIATE MONTHLY WATER BALANCE IN SMALL WATERSHEDS OF IRAN (CASE STUDY: EASTERN AZARBAYEJAN AND NORTH OF KHORASAN). IRANIAN JOURNAL OF NATURAL RESOURCES, 57(3), 415-428. SID. https://sid.ir/paper/22916/en

Vancouver: Copy

MAHDAVI M., AZARAKHSHI M.. A DETERMINATION OF AN APPROPRIATE MONTHLY WATER BALANCE IN SMALL WATERSHEDS OF IRAN (CASE STUDY: EASTERN AZARBAYEJAN AND NORTH OF KHORASAN). IRANIAN JOURNAL OF NATURAL RESOURCES[Internet]. 2004;57(3):415-428. Available from: https://sid.ir/paper/22916/en

IEEE: Copy

M. MAHDAVI, and M. AZARAKHSHI, “A DETERMINATION OF AN APPROPRIATE MONTHLY WATER BALANCE IN SMALL WATERSHEDS OF IRAN (CASE STUDY: EASTERN AZARBAYEJAN AND NORTH OF KHORASAN),” IRANIAN JOURNAL OF NATURAL RESOURCES, vol. 57, no. 3, pp. 415–428, 2004, [Online]. Available: https://sid.ir/paper/22916/en

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