Recurrence of hyper-concentration flows on the orogenic, subtropical island of Taiwan

Guan-Wei Lin, Hongey Chen

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The combination of abundant precipitation and frequent earthquakes in Taiwan, an orogenic, subtropical island, results in huge amounts of sediment discharge delivered into river channels and provides high potential for turbidity current, a kind of extreme hydro-phenomenon characterized by high turbidity and flow velocity. This study collected hydrometric data from 11 rivers around Taiwan, and applied statistical methods to estimate the recurrence interval (RI) of hyper-concentration flow. Analysis results revealed that RI of hyper-concentration flow was dominated mainly by the magnitude of the drainage area and the geological environment within the catchments. The catchments in southwestern Taiwan with relatively larger areas and/or frequent landsliding have comparatively shorter RIs of <10. years. Comparing the RI of daily rainfall with the RI of hyper-concentration flow reveals the possible rainfall threshold for hyper-concentration flow, and the application of rainfall threshold for hyper-concentration flow is well demonstrated in the catchments. The average rainfall threshold for the whole of Taiwan is 510. mm/day, and is positively related with geomaterial properties within the catchments.

Original languageEnglish
Pages (from-to)139-144
Number of pages6
JournalJournal of Hydrology
Volume502
DOIs
Publication statusPublished - 2013 Oct 10

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recurrence interval
catchment
rainfall
turbidity current
river channel
flow velocity
turbidity
drainage
earthquake
river
sediment

All Science Journal Classification (ASJC) codes

  • Water Science and Technology

Cite this

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abstract = "The combination of abundant precipitation and frequent earthquakes in Taiwan, an orogenic, subtropical island, results in huge amounts of sediment discharge delivered into river channels and provides high potential for turbidity current, a kind of extreme hydro-phenomenon characterized by high turbidity and flow velocity. This study collected hydrometric data from 11 rivers around Taiwan, and applied statistical methods to estimate the recurrence interval (RI) of hyper-concentration flow. Analysis results revealed that RI of hyper-concentration flow was dominated mainly by the magnitude of the drainage area and the geological environment within the catchments. The catchments in southwestern Taiwan with relatively larger areas and/or frequent landsliding have comparatively shorter RIs of <10. years. Comparing the RI of daily rainfall with the RI of hyper-concentration flow reveals the possible rainfall threshold for hyper-concentration flow, and the application of rainfall threshold for hyper-concentration flow is well demonstrated in the catchments. The average rainfall threshold for the whole of Taiwan is 510. mm/day, and is positively related with geomaterial properties within the catchments.",
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Recurrence of hyper-concentration flows on the orogenic, subtropical island of Taiwan. / Lin, Guan-Wei; Chen, Hongey.

In: Journal of Hydrology, Vol. 502, 10.10.2013, p. 139-144.

Research output: Contribution to journalArticle

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AU - Lin, Guan-Wei

AU - Chen, Hongey

PY - 2013/10/10

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