Potential effects of a sluice gate on the sea water entrainment of river water in the finite depth river mouth estuary

摘要

In the bay which rivers flow into the head of a bay, the river water entrain the sea water in the bay and promote the sea water exchange. In this paper, theoretical formulation of potential effects of the sluice gate in the finite depth estuary were carried out. And the enlargement effect of the entrainment rate by the potential effects of the sluice gate were investigated. The results indicated that potential of the entrainment rate (Q) is related to four parameters such as the densimetric Froude number at the outlet of river water(F_(do)), the relative depth of the river mouth and the bay (R), the relative opening rate of the gate (G)and the supply of sea water at the bay mouth. Moreover, the decreasing of the relative opening rate of the gate influence to the increasing of the outlet densimetric Froude number of river water, the relative depth of the river mouth and the bay and the potential of the entrainment rate After all, the sluice gate promotes the sea water exctange of the bay.