EVALUATION OF GEOMORPHOLGICAL INSTANTANEOUS UNIT HYDROGRAPH IN KANGIR (EYVANE GHARB) WATERSHED

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MAHMOUDI F.A.; YAMANI M.; BAHRAMI SHAHRAM

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Journal: GEOGRAPHICAL RESEARCH QUARTERLY Year:2007 | Volume:39 | Issue:60 Page(s): 1-14

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Information Journal Paper

Title

EVALUATION OF GEOMORPHOLGICAL INSTANTANEOUS UNIT HYDROGRAPH IN KANGIR (EYVANE GHARB) WATERSHED

Author(s)

MAHMOUDI F.A. | YAMANI M. | BAHRAMI SHAHRAM | Issue Writer Certificate

Keywords

GEOMORPHOLOGICAL INSTANTANEOUS UNIT HYDROGRAPH (GIUH)Q3

KANGIRQ3

PEAK DISCHARGE (QP)Q3

TIME TO PEAK (TP)Q3

PATHSQ2

RBQ2

RLQ2

RAQ2

Abstract

In this study, with the aim of evaluation of effect of geomorphological land forms on flood properties, the GIUH theory has been investigated in KANGIR (Eyvan) catchment. The geomorpholgical instantaneous unit hydrograph model simulates and predicts the flood events for ungauged catchments by means of geomorphological characteristics. For testing the GIUH theory in KANGIR watershed ,at first, quantitative geomorphological properties like bifurcation RAtio (RB), area RAtio (RA), length RAtio(RL), length of highest order stream (LW) and then RAinfall-runoff data and velocity- discharge equations were extracted and thereby QP (peak discharge) and TP (time to peak) were calculated for 5 storm events. The comparison of observed and estimated values represents that calculated QP values are, approximately, close to observed QP values. This study reveals that the performance of GIUH method in predicting QP values is relatively appropriate but its performance in predicting complete shape of hydrographs is inadequate. This study also reveals that geomorphological land forms such as karstic and tectonic holes and joints decrease the runoff velocity and coefficient and therefore affect the QP and TP values. Also, complex relationships between karstic landforms and surface runoff and groundwater as well as RAinfall characteristics, have resulted in low performance and lack of distinct trend of GIUH model in predicting flood. Result of this study shows that QP and TP values, also, are affected by variations of RAinfall intensity in each storm event.

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APA: Copy

MAHMOUDI, F.A., YAMANI, M., & BAHRAMI, SHAHRAM. (2007). EVALUATION OF GEOMORPHOLGICAL INSTANTANEOUS UNIT HYDROGRAPH IN KANGIR (EYVANE GHARB) WATERSHED. GEOGRAPHICAL RESEARCH QUARTERLY, 39(60), 1-14. SID. https://sid.ir/paper/5498/en

Vancouver: Copy

MAHMOUDI F.A., YAMANI M., BAHRAMI SHAHRAM. EVALUATION OF GEOMORPHOLGICAL INSTANTANEOUS UNIT HYDROGRAPH IN KANGIR (EYVANE GHARB) WATERSHED. GEOGRAPHICAL RESEARCH QUARTERLY[Internet]. 2007;39(60):1-14. Available from: https://sid.ir/paper/5498/en

IEEE: Copy

F.A. MAHMOUDI, M. YAMANI, and SHAHRAM BAHRAMI, “EVALUATION OF GEOMORPHOLGICAL INSTANTANEOUS UNIT HYDROGRAPH IN KANGIR (EYVANE GHARB) WATERSHED,” GEOGRAPHICAL RESEARCH QUARTERLY, vol. 39, no. 60, pp. 1–14, 2007, [Online]. Available: https://sid.ir/paper/5498/en

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