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Variations in runoff, sediment load and their relationship for a major sediment source area of the Jialing River basin, southern China
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Investigation of the variations in runoff and sediment load as well as
their dynamic relation is conducive to understanding hydrological
regimes changes and supporting channel regulation and fluvial
management. This study was undertaken in the Xihanshui catchment, which
is known for its high sediment-laden in the Jialing River of the Yangtze
River basin, southern China, to evaluate the change characteristics of
runoff, sediment load and their relationship at multi-temporal scales
from 1966 to 2016. The results showed that the monthly runoff changed
significantly for more months whereas the significant changes in monthly
sediment load occurred from April to September. The contributions of
runoff in summer and autumn and sediment load in summer to their annual
value changes were greater. The annual runoff and sediment load in the
Xihanshui catchment both exhibited significant decreasing trends
(P<0.05) with significant mutation in 1993 (P<0.05).
The average annual runoff in the change period (1994-2016) decreased by
49.60% and annual sediment load displayed a substantial decline with a
reduction of 77.76% in comparison with the reference period
(1966-1993). The variation of the relationship between runoff and
sediment load in the catchment was time-dependent. The annual and
extreme monthly runoff-sediment relationship could be generally
expressed as power function, whereas the monthly runoff-sediment
relationships were changeable. Spatially, the relationship between
annual runoff and sediment load could be partly attributed to sediment
load changes in the upstream and runoff variations in the downstream and
it became weaker in the change period due to the impact of existing soil
and water conservation measures. Quantitative assessment showed that
human activity played a dominant role in annual runoff and sediment load
reduction, with the contributions of 67.07% and 87.64%, respectively.
Title: Variations in runoff, sediment load and their relationship for a major sediment source area of the Jialing River basin, southern China
Description:
Investigation of the variations in runoff and sediment load as well as
their dynamic relation is conducive to understanding hydrological
regimes changes and supporting channel regulation and fluvial
management.
This study was undertaken in the Xihanshui catchment, which
is known for its high sediment-laden in the Jialing River of the Yangtze
River basin, southern China, to evaluate the change characteristics of
runoff, sediment load and their relationship at multi-temporal scales
from 1966 to 2016.
The results showed that the monthly runoff changed
significantly for more months whereas the significant changes in monthly
sediment load occurred from April to September.
The contributions of
runoff in summer and autumn and sediment load in summer to their annual
value changes were greater.
The annual runoff and sediment load in the
Xihanshui catchment both exhibited significant decreasing trends
(P<0.
05) with significant mutation in 1993 (P<0.
05).
The average annual runoff in the change period (1994-2016) decreased by
49.
60% and annual sediment load displayed a substantial decline with a
reduction of 77.
76% in comparison with the reference period
(1966-1993).
The variation of the relationship between runoff and
sediment load in the catchment was time-dependent.
The annual and
extreme monthly runoff-sediment relationship could be generally
expressed as power function, whereas the monthly runoff-sediment
relationships were changeable.
Spatially, the relationship between
annual runoff and sediment load could be partly attributed to sediment
load changes in the upstream and runoff variations in the downstream and
it became weaker in the change period due to the impact of existing soil
and water conservation measures.
Quantitative assessment showed that
human activity played a dominant role in annual runoff and sediment load
reduction, with the contributions of 67.
07% and 87.
64%, respectively.
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