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. 2017 Sep 5;4:170121.
doi: 10.1038/sdata.2017.121.

High Resolution Multibeam and Hydrodynamic Datasets of Tidal Channels and Inlets of the Venice Lagoon

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Free PMC article

High Resolution Multibeam and Hydrodynamic Datasets of Tidal Channels and Inlets of the Venice Lagoon

Fantina Madricardo et al. Sci Data. .
Free PMC article

Abstract

Tidal channels are crucial for the functioning of wetlands, though their morphological properties, which are relevant for seafloor habitats and flow, have been understudied so far. Here, we release a dataset composed of Digital Terrain Models (DTMs) extracted from a total of 2,500 linear kilometres of high-resolution multibeam echosounder (MBES) data collected in 2013 covering the entire network of tidal channels and inlets of the Venice Lagoon, Italy. The dataset comprises also the backscatter (BS) data, which reflect the acoustic properties of the seafloor, and the tidal current fields simulated by means of a high-resolution three-dimensional unstructured hydrodynamic model. The DTMs and the current fields help define how morphological and benthic properties of tidal channels are affected by the action of currents. These data are of potential broad interest not only to geomorphologists, oceanographers and ecologists studying the morphology, hydrodynamics, sediment transport and benthic habitats of tidal environments, but also to coastal engineers and stakeholders for cost-effective monitoring and sustainable management of this peculiar shallow coastal system.

Conflict of interest statement

The authors declare no competing financial interests.

Figures

Figure 1
Figure 1. Working area with coloured polygons representing acquisition coverage by week numbers.
The light pink polygon depicts the area surveyed by the Istituto Idrografico della Marina (IIM) (Italian Hydrographic Institute), whereas the coloured ones the CNR-ISMAR weekly covered areas. Pseudo-true-colour LANDSAT 8 OLI imagery as background.
Figure 2
Figure 2. DTM from the multibeam bathymetry at 0.5 m resolution and 5 times vertical exaggeration showing the distribution of Sound Velocity Profiles (SVPs) collected during the survey.
The blue boxes indicate the areas validated by the Italian Hydrographic Institute and the data included in the official nautical charts. The red, green and yellow boxes show the location of the areas in Figs 6–8, respectively, with pseudo-true-colour LANDSAT 8 OLI imagery as background.
Figure 3
Figure 3. Workflow of the processing performed in CARIS for bathymetry and BS data.
Figure 4
Figure 4. Example of multi beam data processing outputs.
(a) DTM (0.5 m resolution and 5X vertical exaggeration) result of bathymetric data processing executed with CARIS HIPS and SIPS. The black arrow indicates the location of an alignment of wooden poles and amphorae dating back to Roman Times. (b) Example of BS-mosaic processed with CARIS HIPS and SIPS. The black arrow highlights the presence of artefacts.
Figure 5
Figure 5. Unstructured numerical mesh of the hydrodynamic model SHYFEM with the bathymetry interpolated over the mesh elements.
The red dots mark the location of the tide gauges (with ID according to Table 1) used in the model validation and the yellow stars indicate the location of the virtual tidal stations for the tidal correction procedure.
Figure 6
Figure 6. Example of visual evaluation of bathymetric data quality in the Lido Inlet.
(a) Bathymetry and (b) standard deviation error in an area of the Lido Inlet (see Fig. 2) where the weeks 2–5 overlap. The pink polygons indicate the different week surveys.
Figure 7
Figure 7. Variability of seafloor BS intensity over a tidal cycle in different areas of the Lido inlet.
(a) Map of the BS collected during one of the surveys of Experiment 1 in the Lido Inlet and values of the tide during the experiment; (b) boxplots extracted from the mosaics of the total surveyed area (white polygon); (c) of a flat area (blue polygon) and (d)of a ripple area (red polygon), respectively.
Figure 8
Figure 8. Variability of seafloor BS intensity over a tidal cycle in the La Bissa channel.
(a) Map of the BS collected during one of the surveys of Experiment 2 in the La Bissa channel and values of the tide during the experiment; (b) boxplots extracted from the mosaics of the total surveyed area (white polygon); (c) of the bare bottom area (blue polygon) and (d)of the macroalgae area (red polygon), respectively.

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References

Data Citations

    1. Madricardo F., Foglini F., Trincardi F.. Marine Geosciences Data System. 2016 http://dx.doi.org/10.1594/IEDA/323605 - DOI
    1. Madricardo F., Foglini F., Trincardi F.. Marine Geosciences Data System. 2016 http://dx.doi.org/10.1594/IEDA/323853 - DOI
    1. Ferrarin C., Umgiesser G.. PANGAEA. 2016 https://doi.org/10.1594/PANGAEA.867918 - DOI

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