Spatio-temporal streamflow generation in a small, steep headwater catchment in western Japan

Haotian Sun, Tamao Kasahara, Kyoichi Otsuki, Takami Saito, Yuichi Onda

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Headwaters contribute a substantial part of the flow in river networks. However, spatial variations of streamflow generation processes in steep headwaters have not been well studied. In this study, we examined the spatio-temporal variation of streamflow generation processes in a steep 2.98-ha headwater catchment. The time when baseflow of the upstream section exceeded that downstream was coincident with the time when the riparian groundwater switched from downwelling to upwelling. This suggests that upwelling of the riparian groundwater increased considerably in the upstream section during the wet period, producing a shift in the relative size of baseflow between the upstream and downstream sections. The timing of fluctuations among hillslope soil moisture, hillslope groundwater and streamflow reveals that the hillslope contributed to storm flow, but this contribution was limited to the wet period. Overall, these results suggest that streamflow generation has strong spatial variations, even in small, steep headwater catchments. EDITOR A. Castellarin ASSOCIATE EDITOR X. Chen.

Original languageEnglish
Pages (from-to)818-829
Number of pages12
JournalHydrological Sciences Journal
Volume62
Issue number5
DOIs
Publication statusPublished - Apr 4 2017

All Science Journal Classification (ASJC) codes

  • Water Science and Technology

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