A NEW APPROACH IN EXTRACTION OF FLOOD INDEX MAPS IN RIVERS

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SAGHAFIAN B.; ESLAMI A.R.; GHERMEZ CHESHMEH B.

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Journal: IRANIAN JOURNAL OF WATERSHED MANAGEMENT SCIENCE AND ENGINEERING Year:2007 | Volume:1 | Issue:2 Page(s): 30-38

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Information Journal Paper

Title

A NEW APPROACH IN EXTRACTION OF FLOOD INDEX MAPS IN RIVERS

Author(s)

SAGHAFIAN B. | ESLAMI A.R. | GHERMEZ CHESHMEH B. | Issue Writer Certificate

Keywords

REGIONAL FLOODQ3

DIGITAL ELEVATION MODELQ2

RIVERQ3

GISQ2

SPATIAL EXTENSIONQ3

Abstract

Estimation of flood discharges are required for design of hydraulic structures, floodplain zonation and watershed management works. It is required to extend the REGIONAL FLOOD models based on station data to ungaged locations within the same region. The spatial variation of drainage area as the main variable in regional models may be determined by GIS. Therefore, having the regional model and the corresponding maps of independent variables, one may extend the model onto the RIVERs. Specific attention is given to the role of GIS for model's SPATIAL EXTENSION, derivation of flood maps and extraction of flood profiles in RIVERs.Another word, the methodology of SPATIAL EXTENSION of REGIONAL FLOOD analysis based on data of hydrometric stations is the main problem in this paper.The discharge data of 22 watersheds in Gilan province were regionally analyzed. Independent variables such as area and slope were extracted based on the DIGITAL ELEVATION MODEL (DEM). Map of average annual rainfall was also prepared for the region. A program for spatial mapping was written in Arc View GIS.This program uses D8 flow tracing algorithm to identify the upslope cells of a given target cells. Average values of independent variables such as slope and rainfall is determined by having the upslope cell values.Thus, it is possible to compute flood discharge at the ungaged target cell using the regional model equation which involves the average values of independent cells. As such, the flood map in RIVER cells is extracted.One can use these maps to study the variation of flood discharge along the RIVER length. Finally, the share of each independent variable in the REGIONAL FLOOD model was investigated. The methodology to prepare the base flood maps are the most important outcome of this paper which may be used in design of hydraulic structures as well as flood control measures.

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APA: Copy

SAGHAFIAN, B., ESLAMI, A.R., & GHERMEZ CHESHMEH, B.. (2007). A NEW APPROACH IN EXTRACTION OF FLOOD INDEX MAPS IN RIVERS. IRANIAN JOURNAL OF WATERSHED MANAGEMENT SCIENCE AND ENGINEERING, 1(2), 30-38. SID. https://sid.ir/paper/134697/en

Vancouver: Copy

SAGHAFIAN B., ESLAMI A.R., GHERMEZ CHESHMEH B.. A NEW APPROACH IN EXTRACTION OF FLOOD INDEX MAPS IN RIVERS. IRANIAN JOURNAL OF WATERSHED MANAGEMENT SCIENCE AND ENGINEERING[Internet]. 2007;1(2):30-38. Available from: https://sid.ir/paper/134697/en

IEEE: Copy

B. SAGHAFIAN, A.R. ESLAMI, and B. GHERMEZ CHESHMEH, “A NEW APPROACH IN EXTRACTION OF FLOOD INDEX MAPS IN RIVERS,” IRANIAN JOURNAL OF WATERSHED MANAGEMENT SCIENCE AND ENGINEERING, vol. 1, no. 2, pp. 30–38, 2007, [Online]. Available: https://sid.ir/paper/134697/en

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