Fig 2 - uploaded by Tor Gammelsrød
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Comparison of measurements by RBR with ERA-Interim and the TPXO.7 tidal model for OctobereNovember 2012. a) shows significant wave height (ERA-I), b) shows mean wave period (ERA-I) and c) shows tidal elevation (TPX). The grey shading indicates the period when concurrent measurements were made inside the lagoon, i.e. that displayed in Fig. 6.
Source publication
Alongshore flows strongly driven by tides and waves is studied in the context of a one-dimensional numerical model. Observations from field surveys performed in a semi-enclosed lagoon (1.7 kmÂ0.2 km) outside Xai-Xai, Mozambique, are used to validate the model results. The model is able to capture most of the observed temporal variability of the cur...
Contexts in source publication
Context 1
... between modelled data from ERA-I and TPX and data from the outer RBR generally show a good agreement, indi- cating that the modelled data is representative for Xai-Xai, cf. Fig. ...
Context 2
... final point to consider is that for the large wave heights seen at times (see Fig. 2) non-linear wave dynamics that are ignored in our model may be important, for instance that the outside water level depends on the incoming waves through e.g. radiation stresses. The potential impact for modelled sea level difference is unclear, but we note that in general non-linear wave effects would play a greater role for ...
Similar publications
Alongshore flows strongly driven by tides and waves is studied in the context of a one-dimensional numerical model. Observations from field surveys performed in a semi-enclosed lagoon (1.7 km×0.2 km) outside Xai-Xai, Mozambique, are used to validate the model results. The model is able to capture most of the observed temporal variability of the cur...
Citations
... Most of the instruments used in this study have also been used in field experiments at Xai-Xai Beach, and are described more in detail in Christensen et al. (2013). A brief overview is given below for completeness. ...
This report summarizes the 2013 field experiment at Tofo Beach, Tofo, Inhambane, in which measurements of bottom topography, currents, sea level, and surface waves were collected. A visual assessment of the surrounding areas was also made, and some comments are made concerning the morphology at Tofo Beach.
Keywords: Nearshore dynamics, beach morphology
... 1. A second field survey was performed in Xai-Xai in October 2012 close to spring tide (Christensen et al., 2013). Point measurements of current velocity inside the lagoon (Fig. 1) were obtained using an Aanderaa SeaGuard moored at a depth of about 1 m below surface. ...
Alongshore flows strongly driven by tides and waves is studied in the context of a one-dimensional numerical model. Observations from field surveys performed in a semi-enclosed lagoon (1.7 km×0.2 km) outside Xai-Xai, Mozambique, are used to validate the model results. The model is able to capture most of the observed temporal variability of the current, but sea surface height tends to be overestimated at high tide, especially during high wave events. Inside the lagoon we observed a mainly uni-directional alongshore current, with speeds up to 1 ms−1. The current varies primarily with the tide, being close to zero near low tide, generally increasing during flood and decreasing during ebb. The observations revealed a local minimum in the alongshore flow at high tide, which the model was successful in reproducing. Residence times in the lagoon were calculated to be less than one hour with wave forcing dominating the flushing. At this beach a high number of drowning casualties have occurred, but no connection was found between them and strong current events in a simulation covering the period 2011-2012.
