Relationship between wadi drainage characteristics and peak-flood flows in arid northern oman

Ghazi A. Al-Rawas, Caterina Valeo

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Relationships between watershed characteristics and mean wadi flood peaks in arid regions are investi- gated. Mean flood peak discharge was derived for 12 watersheds ranging from 64 to 1730 km 2 in Oman using 270 flood events from 10 years of record. Fourteen watershed characteristics were automatically extracted from a digital elevation model, and multiple regression was used to investigate the effect of these characteristics on wadi mean peak flow (Q MPF) and 5-, 10-, 20-, 50- and 100-year return period flood peaks. Drainage area (DA), wadi slope (WS), watershed mean elevation (BE) and agricultural/farm area (FR) were found to be the key variables affecting flood flows. As return period increased, the influence of BE on flood-peak estimation decreased. In addition, urbanization is increasing alongside increasing agricultural areas, and the inclusion of FR in the relationship improved the variance explanation by 11% over models using only traditional variables such as DA and BE.

Original languageEnglish
Pages (from-to)377-393
Number of pages17
JournalHydrological Sciences Journal
Volume55
Issue number3
DOIs
Publication statusPublished - 2010

Fingerprint

drainage
watershed
return period
farm
peak discharge
peak flow
arid region
multiple regression
digital elevation model
urbanization
agricultural land

Keywords

  • Arid environments
  • Flood frequency analysis
  • Gis
  • Mean peak flows
  • Multiple regression analysis
  • Wadi
  • Watershed characteristics

ASJC Scopus subject areas

  • Water Science and Technology

Cite this

Relationship between wadi drainage characteristics and peak-flood flows in arid northern oman. / Al-Rawas, Ghazi A.; Valeo, Caterina.

In: Hydrological Sciences Journal, Vol. 55, No. 3, 2010, p. 377-393.

Research output: Contribution to journalArticle

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