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APPLICATION OF INDEX PROCEDURES TO FLOOD FREQUENCY ANALUSIS IN TURKEY

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APPLICATION OF INDEX PROCEDURES TO FLOOD FREQUENCY ANALUSIS IN TURKEY
HH113-G Página 1
ÍNDICE
APPLICATION OF INDEX PROCEDURES TO FLOOD FREQUENCY ANALUSIS IN
TURKEY....................................................................................................................................... 2
I. ABSTRACT: .................................................................................................................... 2
II. INTRODUCTION ............................................................................................................ 2
THE REGIONAL FREQUENCY ANALYSIS .................................................................. 3
III. APPLICATION OF THE IFM ..................................................................................... 5
STATISTICAL PROPERTIES ........................................................................................... 5
TESTING FOR REGIONAL HOMOGENEITY ............................................................... 7
HOMOGENEITY TEST ...................................................................................................... 7
IV. RESULTS .................................................................................................................. 14
V. CONCLUSIONS AND RECOMMENDATIONS ....................................................... 18

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APPLICATION OF INDEX PROCEDURES TO FLOOD FREQUENCY ANALUSIS IN TURKEY
HH113-G Página 2
APPLICATION OF INDEX PROCEDURES TO FLOOD
FREQUENCY ANALUSIS IN TURKEY
I. ABSTRACT:
This study investigates the regional analysis of annual maximum flood series of 48
stream gauging stations in the basins of the west Mediterranean region in Turkey.
The region is divided into three homogeneous subregions according to both Student-t
test and Dalrymple homogeneity test. The regional relationships of mean annual flood
per unit area-drainage area and coefficient of skew-coefficient of variation are
obtained. Two statistically meaningful relationships of thee mean flood per unit area-
drainage area and a unique relationship between skewness and variation coefficients
exist. Results show that the index-flood method may be applicable to each
homogenous subregion to estimate flood quantiles in the study area.
(KEY TERMS: flood regionalization; Gumbel distribution; flood-index method; regional
homogenity; flood frequency.)
Saf: betül, 2008. Application of index procedures to Flood Frequency Analysis in
Turkey. Journal of the American Water Resources Association (JAWRA) 44(1):37-47.
DOI: 10.1111/j.1752-1688.2007.00136.x
II. INTRODUCTION
Floods cause damage to properties and agricultural lands that result in an economic
loss for the affected areas. Besides these direct costs, floods can cause loss of life,
injury, inconvenience, and other indirect losses. One method of decreasing flood
damages and economic losses is to use flood frequency analysis for determining
efficient designs of hydraulic structures, such as dams, spillways, highway bridges,
culverts, water-supply systems, and flood control structures. Underdesign of hydraulic
structure, such as a spillway , may cause failure, while overdesign may be safe but
can be costly an optimum design can be achieved whit proper flood frequency and
risk analyses.
At-site estimation of floods considers only the data available from the specific site
under consideration, and the reliability of the estimate is directly related to length of
record information available. Regional flood frequency analysis may be preferable to
an at-site frequency analysis for two main reasons. First, because of short record
length, individual stations in any watershed may have large sampling errors, and
these errors can be reduced by combining data from many sites. Second is the
amount of hydrologic data needed at one site. Thus, transformation from gauged sites
to ungauged sites is required. The regional flood analysis incorporates two main
steps; first, the identification of homogenous regions, and second, the establishment
of a flood frequency distribution model for each region.
Several approaches have been proposed for the delineation of homogeneous regions
(Wiltshire, 1986; Cavadias, 1990; Burn 1190a,b; 1997;Zrinji and Burn, 1993, 1994;
ouarda et al., 2201)and for regional estimation (dalrymple, 1960; hosking et al., 1985;
Fill and Stedinger, 1998; Pandey and Nguyen 1999). Cunnane (1998) provided a

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ÍNDICE APPLICATION OF INDEX PROCEDURES TO FLOOD FREQUENCY ANALUSIS IN TURKEY 2 I.ABSTRACT: 2 II.INTRODUCTION 2 THE REGIONAL FREQUENCY ANALYSIS 3 III.APPLICATION OF THE IFM 5 STATISTICAL PROPERTIES 6 TESTING FOR REGIONAL HOMOGENEITY 8 HOMOGENEITY TEST 8 IV.RESULTS 14 V.CONCLUSIONS AND RECOMMENDATIONS 19 APPLICATION OF INDEX PROCEDURES TO FLOOD FREQUENCY ANALUSIS IN TURKEY I. ABSTRACT: This study investigates the regional analysis of annual maximum flood series of 48 stream gauging stations in the basins of the west Mediterranean region in Turkey. The region is divided into three homogeneous subregions according to both Student-t test and Dalrymple homogeneity test. The regional relationships of mean annual flood per unit area-drainage area and coefficient of skew-coefficient of variation are obtained. Two statistically meaningful relationships of thee mean flood per unit area-drainage area and a unique relationship between skewness and variation coefficients exist. Results show that the index-flood method may be applicable to each homogenous subregion to estimate flood quantiles in the study area. (KEY TERMS: flood regionalization; Gumbel distribution; flood-index method; regional homogenity; flood frequency.) Saf: betül, 2008. Application of index procedures to Flood Frequency Analysis in Turkey. Journal of the American Water Resources Association (JAWRA) 44(1):37-47. DOI: 10.1111/j.1752-1688.2007.00136.x II. INTRODUCTION Floods cause damage to properties and agric ...
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