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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Temporal variation of the relationship between water discharge and sediment concentration in the pea...
Temporal variation of the relationship between water discharge and sediment concentration in the pearl river deltas
Author : HAOCHUAN FENG(1)(2),WEI ZHANG(1)(2)
between water discharge and sediment concentration in rivers are significant for understanding
morphodynamics and environmental characteristics of the river deltas. As the sediment is stored at low flow and
transported under high discharge conditions, the flux of suspended sediment in rivers is often a function of water
discharge. In the case of the Pearl River Basin, complexity of the relationship is affected by the fragile geological
environment and the intensive human activities. In this study, relationship between water discharge and sediment
concentration are illustrated based on the recent 50 years of monthly date set in the three major rivers of the Pearl River
Delta. On the basis of analysis, the decadal and annual variations of suspended sediment load are been described.
Specifically, the annual suspended sediment load from the Pearl River running into the sea exerts a significant
decreasing trend in the past two decades, with the average sediment flux being 38.60% less in the 2000s than that in the
1950s. On the contrary, the sediment flux had an obvious increasing trend before the 1990s, the average annual
sediment flux increased by 30.43%. Meanwhile, water discharge reached its peak in this decade at the same level as
sediment transport, the method of regression analysis was used to explore the influence of precipitation in the variation
on the sediment flux. It was found that the climate change is not the main driving force which regulate the variation in
suspended sediment load. Furthermore, the sediment rating curve in 1957 to1970 is applied to estimate potential
sediment load (1971 to 2012) in the absence of human influences. The result show that the intensive land use caused an
increase in suspended sediment load before the 1980s, while the massive construction of large dams after 1990s result
in a decrease in the suspended sediment load delivered to the ocean.Form Required :
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 28/08/2015
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