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:: Volume 1, Issue 2 (10-2007) ::
jwmseir 2007, 1(2): 30-38 Back to browse issues page
A New Approach in Extraction of Flood Index Maps in Rivers
Bahram Saghafian , Ali Reza Eslami , Bagher Ghermezcheshmeh
Soil Conservation and Watershed Management Research Center
Abstract:   (16843 Views)

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.

Keywords: Regional Flood, Digital Elevation Model, River, GIS, Spatial Extension
Full-Text [PDF 428 kb]   (1383 Downloads)    
Type of Study: Research | Subject: Special
Received: 2012/10/29 | Accepted: 2014/05/25 | Published: 2014/05/25
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saghafian B, Eslami A R, Ghermezcheshmeh B. A New Approach in Extraction of Flood Index Maps in Rivers. jwmseir. 2007; 1 (2) :30-38
URL: http://jwmsei.ir/article-1-39-en.html

Volume 1, Issue 2 (10-2007) Back to browse issues page
مجله علوم ومهندسی آبخیزداری ایران Iranian Journal of Watershed Management Science and Engineering
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