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| Titel |
Using an integrated method to estimate watershed sediment yield during heavy rain period: a case study in Hualien County, Taiwan |
| VerfasserIn |
S. M. Hsu, H. Y. Wen, N. C. Chen, S. Y. Hsu, S. Y. Chi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 6 ; Nr. 12, no. 6 (2012-06-18), S.1949-1960 |
| Datensatznummer |
250010926
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| Publikation (Nr.) |
 copernicus.org/nhess-12-1949-2012.pdf |
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| Zusammenfassung |
| A comprehensive approach estimating sediment yield from a watershed is
needed to develop better measures for mitigating sediment disasters and
assessing downstream impacts. In the present study, an attempt has been made
to develop an integrated method, considering sediment supplies associated
with soil erosion, shallow landslide and debris flow to estimate sediment
yield from a debris-flow-prone watershed on a storm event basis. The
integrated method is based on the HSPF and TRIGRS models for predicting soil
erosion and shallow landslide sediment yield, and the FLO-2D model for
calculating debris flow sediment yield. The proposed method was applied to
potential debris-flow watersheds located in the Sioulin Township of Hualien
County. The available data such as hourly rainfall data, historical
streamflow and sediment records as well as event-based landslide inventory
maps have been used for model calibration and validation. Results for
simulating sediment yield have been confirmed by comparisons of observed
data from several typhoon events. The verified method employed a 24-h
design hyetograph with the 100-yr return period to simulate sediment yield
within the study area. The results revealed that the influence of shallow
landslides on sediment supply as compared with soil erosion was significant.
The estimate of landslide transport capacity into a main channel indicated the
sediment delivery ratio on a typhoon event basis was approximately 38.4%.
In addition, a comparison of sediment yields computed from occurrence and
non-occurrence of debris flow scenarios showed that the sediment yield from
an occurrence condition was found to be increasing at about 14.2 times more than
estimated under a non-occurrence condition. This implied watershed sediment
hazard induced by debris flow may cause severe consequences. |
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