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Regional Analysis of Monthly Rainfalls over Amasya Province via L-Moments Method

Year 2005, Volume: 2005 Issue: 2, 51 - 56, 01.06.2005

Abstract

The study aims to perform regional frequency analysis of monthly rainfalls measured over Amasya province by using L-moment approach. Initially, Amasya province was formed two groups (as first and second) of rain gauge stations (sites) in the province to satisfy the homogeneity condition by using discordancy measure. Thereafter, heterogeneity (H) test was applied to assess whether the regions proposed as homogeneous according to discordancy measure of site characteristics are reasonably treated as a homogeneous region. This test confirmed the delineated regions as homogeneous. Choosing the best fit frequency distribution for the data from the sites of the selected regions was based on the Z-statistic. According to this statistic, the best fit distributions were estimated, generalized extreme value type I (GEV) for the first region, and Pearson type three (P3) or generalized extreme value type I for the second region.

References

  • Anonymous, 1991. Amasya İli Arazi Varlığı. Köy Hizmetleri Genel Müdürlüğü Yayinları, 101p, Ankara.
  • Greenwood, J.A., J.M. Landwehr, N.C. Matalas and J.R. Wallis, 1979. Probability Weighted Moments: Definition and Relation to Parameters of Several Distributions Expressable in Inverse Form. Water Resources Research, 15, 1049-1054.
  • Hosking, J.R.M., 1990. L-Moments: Analysis and Estimation Combinations of Order Statistics. Journal of The Royal Statistical Society Series B, 52, 105-124.
  • Hosking, J.R.M. and Wallis, J.R. 1993. Some Statistics Useful in Regional Frequency Analysis. Water Resources Research, 29, 271-281.
  • Hosking, J.R.M., 1996. Fortran Routines for Use with the method of L-Moments, Version 3, Research Report RC 20525, 33p, New York-USA.
  • Hosking, J.R.M. and Wallis, J.R., 1997. Regional Frequency Analysis: An Approach Based on L- Moments. Cambridge University Press, 224 p., USA.
  • Okman, C., 1994. Hydrology. University of Ankara Faculty of Agriculture, Publication No, 1388, 359p, Ankara. (in Turkish).
  • Park, J.S., Jung, H.S., Kim, R.S. and Oh, J.H., 2001. Modelling Summer Extreme Rainfall over the Korean Penissula Using Wakeby Distribution. International Journal of Climatology, 21, 1371-1384.
  • Sankarasubramanian, A. and Sirinivasan, K., 1999. Investigation Properties Moments. Journal of Hydrology, 218, 13-34. Conventional of L-Moments and

L-Moment Yöntemi ile Amasya İlindeki Aylık Yağmurların Bölgesel Analizi

Year 2005, Volume: 2005 Issue: 2, 51 - 56, 01.06.2005

Abstract

Bu çalışma, Amasya ilinde ölçülen aylık yağmurların bölgesel frekans analizini yapmayı amaçlamaktadır. Öncelikle, Amasya ili, homojenlik (discordancy) ölçüsü kullanılarak, homojenlik koşulunu yerine getirmek amacıyla ildeki yağmur istasyonları iki gruba (birinci ve ikinci olarak) ayrılmıştır. Daha sonra, homojenlik ölçüsüne göre homojen olarak önerilen bölgelerin, gerçekten homojen olup olmadığını değerlendirmek için heterojenlik testi uygulanmıştır. Bu test seçilen bölgelerin homojen olduğunu göstermiştir. Seçilen bölgelerin istasyonlarından elde edilen veriler için en uygun frekans dağılımının seçimi Z-istatistiğine göre belirlenmiştir. Bu istatistiğe göre, birinci bölge için genelleştirilmiş ekstrem tip I (GEV) , ikinci bölge için ise Person tip 3 (P3) yada genelleştirilmiş ekstrem tip I frekans dağılımları en uygun dağılımlar olarak belirlenmiştir.

References

  • Anonymous, 1991. Amasya İli Arazi Varlığı. Köy Hizmetleri Genel Müdürlüğü Yayinları, 101p, Ankara.
  • Greenwood, J.A., J.M. Landwehr, N.C. Matalas and J.R. Wallis, 1979. Probability Weighted Moments: Definition and Relation to Parameters of Several Distributions Expressable in Inverse Form. Water Resources Research, 15, 1049-1054.
  • Hosking, J.R.M., 1990. L-Moments: Analysis and Estimation Combinations of Order Statistics. Journal of The Royal Statistical Society Series B, 52, 105-124.
  • Hosking, J.R.M. and Wallis, J.R. 1993. Some Statistics Useful in Regional Frequency Analysis. Water Resources Research, 29, 271-281.
  • Hosking, J.R.M., 1996. Fortran Routines for Use with the method of L-Moments, Version 3, Research Report RC 20525, 33p, New York-USA.
  • Hosking, J.R.M. and Wallis, J.R., 1997. Regional Frequency Analysis: An Approach Based on L- Moments. Cambridge University Press, 224 p., USA.
  • Okman, C., 1994. Hydrology. University of Ankara Faculty of Agriculture, Publication No, 1388, 359p, Ankara. (in Turkish).
  • Park, J.S., Jung, H.S., Kim, R.S. and Oh, J.H., 2001. Modelling Summer Extreme Rainfall over the Korean Penissula Using Wakeby Distribution. International Journal of Climatology, 21, 1371-1384.
  • Sankarasubramanian, A. and Sirinivasan, K., 1999. Investigation Properties Moments. Journal of Hydrology, 218, 13-34. Conventional of L-Moments and
There are 9 citations in total.

Details

Primary Language Turkish
Journal Section Research Articles
Authors

Kadri Yürekli This is me

Publication Date June 1, 2005
Published in Issue Year 2005 Volume: 2005 Issue: 2

Cite

APA Yürekli, K. (2005). L-Moment Yöntemi ile Amasya İlindeki Aylık Yağmurların Bölgesel Analizi. Journal of Agricultural Faculty of Gaziosmanpaşa University (JAFAG), 2005(2), 51-56.