EFFICIENCY OF EVALUATION OF DISKIN METHOD IN DERIVATION OF INSTANTANEOUS UNIT HYDROGRAPH IN JAFAR-ABAD WATERSHED, GOLESTAN PROVINCE

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MOSTAFAZADEH RAOOF; BAHREMAND ABDOLREZA; ZABIHI MOHSEN

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Journal: IRANIAN JOURNAL OF ECOHYDROLOGY Year:2015 | Volume:2 | Issue:2 Page(s): 141-150

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Title

EFFICIENCY OF EVALUATION OF DISKIN METHOD IN DERIVATION OF INSTANTANEOUS UNIT HYDROGRAPH IN JAFAR-ABAD WATERSHED, GOLESTAN PROVINCE

Author(s)

MOSTAFAZADEH RAOOF | BAHREMAND ABDOLREZA | ZABIHI MOHSEN | Issue Writer Certificate

Keywords

DIRECT RUNOFF HYDROGRAPHQ3

DSIKIN METHODQ3

INSTANTANEOUS UNIT HYDRO GRAPHQ3

JAFAR ABAD WATERSHEDQ3

S CURVEQ3

Abstract

Instantaneous Unit Hydrograph (IUH) is the response of a watershed subjected to a storm with an excess rainfall of 1 unit depth occurring to the watershed instantaneously, used as the response function in rainfall- runoff modeling. Omission of excess rainfall duration from unit hydro graph theory has made it better and easier to investigate in rainfall- runoff relationship. This study focuses on derivation of I UH from direct runoff hydro graph using Diskin method in JAFAR ABAD WATERSHED (109 km2) located in Golestan Province. Using hourly hydro-meteoerological data, the index unit hydrograph was derived from 27 storms by S CURVE method and then index IUH was calculated from S CURVE. Diskin method was used for derivation of IUH from four different direct runoff hydro graphs. The efficiency of Diskin method was evaluated by statistical comparison with the observed IUH. The results indicated that the method derived I UHs with good accuracy, 85% according to the Nash-Sutcliffe criterion. Also, mea n relative error of instantaneous peak discharge and relative error of instantaneous time to peak are 2.24% and 6.25%, respectively while the model bias for water balance is -0.92%. Nonetheless more researches in other watersheds are suggested for derivation of instantaneous and flashy floods for planning into reduction of flood damages.

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APA: Copy

MOSTAFAZADEH, RAOOF, BAHREMAND, ABDOLREZA, & ZABIHI, MOHSEN. (2015). EFFICIENCY OF EVALUATION OF DISKIN METHOD IN DERIVATION OF INSTANTANEOUS UNIT HYDROGRAPH IN JAFAR-ABAD WATERSHED, GOLESTAN PROVINCE. IRANIAN JOURNAL OF ECOHYDROLOGY, 2(2), 141-150. SID. https://sid.ir/paper/253976/en

Vancouver: Copy

MOSTAFAZADEH RAOOF, BAHREMAND ABDOLREZA, ZABIHI MOHSEN. EFFICIENCY OF EVALUATION OF DISKIN METHOD IN DERIVATION OF INSTANTANEOUS UNIT HYDROGRAPH IN JAFAR-ABAD WATERSHED, GOLESTAN PROVINCE. IRANIAN JOURNAL OF ECOHYDROLOGY[Internet]. 2015;2(2):141-150. Available from: https://sid.ir/paper/253976/en

IEEE: Copy

RAOOF MOSTAFAZADEH, ABDOLREZA BAHREMAND, and MOHSEN ZABIHI, “EFFICIENCY OF EVALUATION OF DISKIN METHOD IN DERIVATION OF INSTANTANEOUS UNIT HYDROGRAPH IN JAFAR-ABAD WATERSHED, GOLESTAN PROVINCE,” IRANIAN JOURNAL OF ECOHYDROLOGY, vol. 2, no. 2, pp. 141–150, 2015, [Online]. Available: https://sid.ir/paper/253976/en

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