摘要
Tidal cycle measurements of tidal currents, salinity and water tempe rature, and suspended sediment concentrations were measured at four stations, to gether with surveys along two profiles short core collection within the Yalu Riv er estuary. Grain size analysis of the three core sediment showed that: 1) the s ediment from B1 to B3 became finer, worse sorting and positively skewed; 2) the diversification of matter origin became more and more evident from east to west; 3) the sediments over the region were of the same origin, as indicated by their similar colors and grain sizes. The data indicated that stratification occurred in the flood season, from upstream to downstream, and a salt wedge was formed. The water column was well mixed, but the longitudinal gradient of the salinity w as larger on spring tide. The results also showed that the dominating mechanism of suspended sediment transport in the Yalu River estuary was T1, T2, T3 and T5. The non-tidal steady advection transport was restricted by the net transport o f suspended sediment induced by mass Stoked drift directed to landwards, then th e net sediment transport rate were decreased and the turbidity maxima was also f avored to forming and extending.
Tidal cycle measurements of tidal currents, salinity and water temperature,and suspended sediment concentrations were measured at four stations, together with surveys alongtwo profiles short core collection within the Yalu River estuary. Grain size analysis of the threecore sediment showed that: 1) the sediment from B_1 to B_3 became finer, worse sorting andpositively skewed; 2) the diversification of matter origin became more and more evident from east towest; 3) the sediments over the region were of the same origin, as indicated by their similarcolors and grain sizes. The data indicated that stratification occurred in the flood season, fromupstream to downstream, and a salt wedge was formed. The water column was well mixed, but thelongitudinal gradient of the salinity was larger on spring tide. The results also showed that thedominating mechanism of suspended sediment transport in the Yalu River estuary was T_1, T_2, T_3 andT_5. The non-tidal steady advection transport was restricted by the net transport of suspendedsediment induced by mass Stoked drift directed to landwards, then the net sediment transport ratewere decreased and the turbidity maxima was also favored to forming and extending.
基金
theNationalNaturalScienceFoundationofChina(No.49376278)andanOutstandingYoungSci-entist'sGrant(No.49725612).
关键词
鸭绿江
河口
粒度
水土保持
泥砂运动
悬浮
沉降
grain size
suspended sediment transport
turbidity maximum
the YaluRiver estuary
