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| Titel |
Modeling suspended sediment sources and transport in the Ishikari River basin, Japan, using SPARROW |
| VerfasserIn |
W. L. Duan, B. He, K. Takara, P. P. Luo, D. Nover, M. C. Hu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 3 ; Nr. 19, no. 3 (2015-03-06), S.1293-1306 |
| Datensatznummer |
250120653
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| Publikation (Nr.) |
 copernicus.org/hess-19-1293-2015.pdf |
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| Zusammenfassung |
| It is important to understand the mechanisms that control the fate and transport
of suspended sediment (SS) in rivers, because high suspended sediment loads
have significant impacts on riverine hydroecology. In this study, the SPARROW
(SPAtially Referenced Regression on Watershed Attributes) watershed model was
applied to estimate the sources and transport of SS in surface waters of the
Ishikari River basin (14 330 km2), the largest watershed in Hokkaido,
Japan. The final developed SPARROW model has four source variables
(developing lands, forest lands, agricultural lands, and stream channels),
three landscape delivery variables (slope, soil permeability, and
precipitation), two in-stream loss coefficients, including small streams
(streams with drainage area < 200 km2) and large streams, and
reservoir attenuation. The model was calibrated using measurements of SS from
31 monitoring sites of mixed spatial data on topography, soils and stream
hydrography. Calibration results explain approximately 96% (R2) of
the spatial variability in the natural logarithm mean annual SS flux
(kg yr−1) and display relatively small prediction errors at the 31
monitoring stations. Results show that developing land is associated with the
largest sediment yield at around 1006 kg km−2 yr−1, followed
by agricultural land (234 kg km−2 yr−1). Estimation of
incremental yields shows that 35% comes from agricultural lands,
23% from forested lands, 23% from developing lands, and 19%
from stream channels. The results of this study improve our understanding of
sediment production and transportation in the Ishikari River basin in
general, which will benefit both the scientific and management communities in
safeguarding water resources. |
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