RUNOFF COMPUTATION USING SPATIALLY DISTRIBUTED TERRAIN PARAMETERS

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AKBARPOUR ABOU ALFAZL; SHARIFI M.B.

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Paper Information

Journal: JOURNAL OF SCHOOL OF ENGINEERING Year:2007 | Volume:19 | Issue:1 (CIVIL ENGINEERING ISSUE) Page(s): 85-106

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Title

RUNOFF COMPUTATION USING SPATIALLY DISTRIBUTED TERRAIN PARAMETERS

Author(s)

AKBARPOUR ABOU ALFAZL | SHARIFI M.B. | Issue Writer Certificate

Keywords

UINT HYDROGRAPHQ3

GISQ3

FIRST PASSAGE TIME DISTRIBUTION FUNCTIONQ3

Abstract

In the past, Geomorphologic Instantaneous Unit Hydrograph (GIUH) had been proposed as a tool to generation of flood hydrographs from storm rainfall data. Nowadays, Spatial Unit Hydrograph is used instead, with making use of Geographic Information Systems (GIS). First, watershed is divided into small square cells, and then routing of runoff from each cell to the basin outlet is calculated using the first passage time response function based on the mean and variance of the flow time distribution, which is derived from advection- dispersion transport equation. The flow velocity for ground surface cells is calculated by Overton’s equation and for channel flow cells by Manning’s equation based on the local slope, roughness coefficient and hydraulic radius. The total direct runoff at the basin outlet is obtained by superimposing all contributions from every grid cell. The model is tested on kameh catchment in Khorasan Razavi state. Results are in excellent agreement with the measured hydrograph at the basin outlet. Sensitivity analysis shows that parameters of channel roughness coefficient and minimum slope threshold have larger influence than parameter of thershold of drainage area in delineating channel networks on peak discharge, time to peak and on the outflow hydrograph, Since the model accounts for spatially distributed hydrologic and geophysical characteristics of the catchments, it has great potential for study of the influence of changes in land use or soil cover on the hydrologic behavior of a river basin.

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APA: Copy

AKBARPOUR, ABOU ALFAZL, & SHARIFI, M.B.. (2007). RUNOFF COMPUTATION USING SPATIALLY DISTRIBUTED TERRAIN PARAMETERS. JOURNAL OF SCHOOL OF ENGINEERING, 19(1 (CIVIL ENGINEERING ISSUE)), 85-106. SID. https://sid.ir/paper/22612/en

Vancouver: Copy

AKBARPOUR ABOU ALFAZL, SHARIFI M.B.. RUNOFF COMPUTATION USING SPATIALLY DISTRIBUTED TERRAIN PARAMETERS. JOURNAL OF SCHOOL OF ENGINEERING[Internet]. 2007;19(1 (CIVIL ENGINEERING ISSUE)):85-106. Available from: https://sid.ir/paper/22612/en

IEEE: Copy

ABOU ALFAZL AKBARPOUR, and M.B. SHARIFI, “RUNOFF COMPUTATION USING SPATIALLY DISTRIBUTED TERRAIN PARAMETERS,” JOURNAL OF SCHOOL OF ENGINEERING, vol. 19, no. 1 (CIVIL ENGINEERING ISSUE), pp. 85–106, 2007, [Online]. Available: https://sid.ir/paper/22612/en

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