The Relationship between Discharge and Suspended Sediment Concentration at Typhoon Events in Yu-Feng Catchment
Resource
地理學報, 49, 001-022
Journal
地理學報
Journal Issue
49
Pages
001-022
Date Issued
2007-09
Date
2007-09
Author(s)
Chu, Y.T.
Hsu, M.L.
Abstract
Hourly water samples collected in the Yu-Feng catchment, an upper montane catchment of Shihmen Reservoir, from seven typhoon events in 2002 and 2006 were used to construct hydrographs and time series of sediment concentration. It was found that the relationship between discharge and sediment concentration of an event was related to the antecedent rainfall, rainfall characteristics, and the timing of the events in the typhoon season. The hysteresis effect was less obvious when typhoons occurred in the beginning of the typhoon season. In contrast, typhoons which took place right after others showed clockwise hysteretic loops, indicating signs of sediment depletion in the catchment. Comparison of the landslide intensities at the loci of hourly rainfall centers in temporal sequence with the pattern of sediment concentration in the hydrographs verified the importance of landslides in affecting the fluvial sediment concentration. Comparisons of landslides records showed that landslide area increased two times from 2002 to 2006. During the same time period, the sediment concentration level from the typhoon events increased 13.1-15.6 times. Sediment concentration in the rising limbs of those 2006 hydrographs increased at much higher rates than those of 2002 hydrographs. In contrast, sediment concentration in the falling limbs of 2006 hydrographs decreased at much slower rates than those of 2002 hydrographs. These phenomena testified the existence of abundant sediment supply in 2006.
Subjects
颱風
崩塌
遲滯圈
懸移質
暴雨中心
typhoon
landslide
hysteretic loop
suspended sediment
rainfall center
Type
journal article
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