Influence of Storm Event Magnitudes on Runoff Recession Curves in a Small Forested Catchment

DOI Web Site Web Site 1 Citations 10 References

Bibliographic Information

Other Title
  • 森林小流域における洪水流出減衰曲線に降雨規模が及ぼす影響
  • シンリン ショウリュウイキ ニ オケル コウミズリュウシュツ ゲンスイ キョクセン ニ コウウ キボ ガ オヨボス エイキョウ

Search this article

Abstract

<p> Storm runoff recession curves in a mountainous catchment have been identified as an inherent property, but it remains unclear whether they are influenced by storm event magnitudes. This paper presented an examination of this influence using a hydrological dataset observed for 14 years in a small forested catchment (Shigaraki study site) in Shiga Prefecture, Japan. For large storm events, almost the entire rainfall increase was allocated to the stormflow, suggesting that the stormflow contribution areas were extended to the entire catchment area. They are called fixed events. Runoff recession curves for them were regarded as an inherent catchment property because the recession curves were smooth with no inflection point. On a double logarithmic chart, a constant linear relation was found between the runoff rate (q) and its temporal change (-dq/dt). Although a similar relation was found for intermediate storm events, the lines were not the same but were parallel to those for fixed events. This result shows that the runoff contribution area for each intermediate storm event was limited to a partial catchment area, but the relation between runoff rate and storage was the same as that for fixed events, suggesting that the stormflow recession curves were produced through the vertical unsaturated flow within the runoff contribution areas. A quicker recession curve was detected for each of the runoff recession curves for some intermediate as well as shower-type events, suggesting a local generation of stormflow, but details of the runoff mechanism were left as a subject for future study.</p>

Journal

Citations (1)*help

See more

References(10)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top