Investigating meteorological effect on river flow recession rate in an arid environment

Luminda Niroshana Gunawardhana*, Ghazi A. Al-Rawas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This study explores previously unreported linkage between recession rates of rainfall hyetograph and river flow hydrograph in an arid environment in Sultanate of Oman. Ephemeral streams are hydraulically disconnected from groundwater aquifers and depend on rainfall to produce water that flows only for hours or a few days at most. It therefore prompted to hypothesize that the recession rate of the rainfall event controls the corresponding recession of river flow. To test this assumption, 1-h river flow rates and 20-min rainfall rates in Al-Khoud catchment area for the period 1997–2013 were analysed. The river flow recession rate and antecedent river flow were found to be inversely proportional, while their relation improved with increasing time span of cumulating the antecedent river flow. The results further show that the simulation of river flow recession rate can be improved by incorporating the combined effects of rainfall recession rate and antecedent moisture content.

Original languageEnglish
Pages (from-to)2249-2255
Number of pages7
JournalHydrological Sciences Journal
DOIs
Publication statusPublished - 2020
Externally publishedYes

Keywords

  • antecedent moisture content (AMC)
  • compound effect
  • Oman
  • vadose zone

ASJC Scopus subject areas

  • Water Science and Technology

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