The hydraulics theory and wind-wave modelling are used to model annual changes of a threshold (sand bar) height at the mouth of the Narva River in 2002. The changes in the threshold height are attributed to two mechanisms: the cross-shore sediment transport driven by the river flow that erodes the obstacle and the long-shore transport forced by waves that increases the threshold height. It is shown that the flow stratification in the river mouth switches between one- and two-layer modes in different seasons, depending on variations of water level, river discharge and wave activity.
Joint influence of river stream, water level and wind waves on the height of sand bar in a river mouth
J. Laanearu, T. Koppel, T. Soomere, P.A. Davies; Joint influence of river stream, water level and wind waves on the height of sand bar in a river mouth. Hydrology Research 1 June 2007; 38 (3): 287–302. doi: https://doi.org/10.2166/nh.2007.012
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