The evolution of erosion and deposition in tidal rivers is related to river regulation and smooth navigation,it is of great significance to study the riverbed activity and its variation in temporal and spatial.Taken the Shenzhen River,a typical tidal-dominant river,as an example,the variation characteristics of water and sediment relationship in different river reaches during flood and dry seasons are comparative analyzed,and the dominant discharges in different seasons are calculated by the Makayev method,the impacts of river runoff and tidal current on the dominant discharge are also discussed to further explore the temporal and spatial variations of riverbed activity.The results show that the periodic flood-ebb tidal current plays a substantive role on the riverbed evolution,there exists a cluster of dominant discharge with basically equivalent bed forming effect.The dominant discharge at Shenzhenhekou station in the lower reach ranges from 200 to 280 m3/s,and it is greater in the wet season than that in the dry season.However,the dominant discharge at Luohu station in the upper reach is about 40～60 m3/s,with small difference in different seasons.The characteristics of scouring in flood season and silting in dry season are in good relationship with the variation of dominant discharge,the riverbed activity in the upper and lower reaches of the Shenzhen River presents significant spatial differences.
dominant dischargeflood and ebb currentseasonal changestidal river
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