EFFECT OF PIXEL SIZE OF A HYDROLOGIC MODEL ON SIMULATION OF FLOOD PEAK

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ALVANKAR S.R.; SAGHAFIAN B.; SEDGHI H.

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Journal: Year:2006 | Volume:12 | Issue:2 Page(s): 329-345

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Information Journal Paper

Title

EFFECT OF PIXEL SIZE OF A HYDROLOGIC MODEL ON SIMULATION OF FLOOD PEAK

Author(s)

ALVANKAR S.R. | SAGHAFIAN B. | SEDGHI H. | Issue Writer Certificate

Keywords

RUNOFF SIMULATIONQ3

DISTRIBUTED RAINFALL- RUNOFF MODELQ3

GISQ3

GRID SIZEQ3

Abstract

Physical properties of watersheds are not uniform throughout the watershed. Distributed rainfall runoff models have been developed to account for spatial distribution of watershed characteristics on flood hydrographs. On the other hand, due to advances in geographical information systems (GIS), the possibility of using distributed rainfall-runoff models has become more feasible. This research studies the effect of grid cell size on flood hydrograph in Kan watershed with an area of 206 Km2 located North West of Tehran. A distributed hydrological model on the basis of SCS infiltration and Clark flow routing using Visual Basic programming language is developed. Landsat TM Color composites bands 1, 4, and 7 are used for lithology recognition by hard classify method in IDRISI software. For determining infiltration in each classified lithology, infiltration measurements by rainfall simulator are conducted in each lithology zone. The result of this research shows that with increasing cell size from 30 meter to 960 meter, maximum flood discharge decreases. The rate of decrease depends on the spatial variation of rainfall and physical properties of land in the basin. By decreasing spatial variation of rainfall and infiltration in the watershed, the variation of maximum flood discharge will decrease. The results of this research show that by increasing time step from 10 minutes to 30 minutes, the computer run time will decrease by more than 50%, while maximum flood discharge will decrease by about 0.5%.

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APA: Copy

ALVANKAR, S.R., SAGHAFIAN, B., & SEDGHI, H.. (2006). EFFECT OF PIXEL SIZE OF A HYDROLOGIC MODEL ON SIMULATION OF FLOOD PEAK. JOURNAL OF AGRICULTURAL SCIENCES, 12(2), 329-345. SID. https://sid.ir/paper/7865/en

Vancouver: Copy

ALVANKAR S.R., SAGHAFIAN B., SEDGHI H.. EFFECT OF PIXEL SIZE OF A HYDROLOGIC MODEL ON SIMULATION OF FLOOD PEAK. JOURNAL OF AGRICULTURAL SCIENCES[Internet]. 2006;12(2):329-345. Available from: https://sid.ir/paper/7865/en

IEEE: Copy

S.R. ALVANKAR, B. SAGHAFIAN, and H. SEDGHI, “EFFECT OF PIXEL SIZE OF A HYDROLOGIC MODEL ON SIMULATION OF FLOOD PEAK,” JOURNAL OF AGRICULTURAL SCIENCES, vol. 12, no. 2, pp. 329–345, 2006, [Online]. Available: https://sid.ir/paper/7865/en

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