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Title / link | Description | |||
Installing a FAST field work site https://youtu.be/FqkcA7-cm-M
| Overview on how the FAST team install a fieldwork site. The video includes how the deployment of the measuring equipment is done for most of the methods used for field data collection. | |||
Sedimentation erosion table method https://youtu.be/6MvGkECdEgg
| Instructions on how to measure how the sedimentation rate is changing with a sedimentation-erosion table (SET) | |||
Measuring Sediment Dynamics https://youtu.be/c0-QiQkSzsQ
| Measuring sediment dynamics has been an important tool to study foreshores for years. The NIOZ developed and perfected special sensors for long term monitoring of these dynamics. This sensor uses 200 light sensors, and uses the difference between dark and light to determine the soil elevation. By measuring this continuously for months we gain valuable insights into both the small and large scale sediment dynamics. | |||
Side-on photography for vegetation analysis-on photography for vegetation analysis https://youtu.be/Sks8T2erqOg
| Video demonstration of the use of side-on photography for vegetation analysis in salt marsh canopies. The method was originally developed for use in salt marshes by Möller (2000) and in parallel by Zehm et al. (2003) for grasslands, with further application for salt marshes reported by Möller (2006). Analysis of digital images obtained through the use of this method allows relative differences in the density, height, and structure of vegetation within a small area (in this case a rectangle of 0.2 x 0.6 m) to be compared across space or over time. Relationships between vegetation pixel density, as determined using this method, and biomass of salt marsh species have been suggested by Möller’s (2006) and Rupprecht et al.’s (2015) studies.. | |||
Ground Based Spectrometry https://youtu.be/71orTF5Sedk
Ground Based Spectrometry https://youtu.be/71orTF5Sedk | A quick overview of how UCA makes ground-based spectrometry measurements to relate the reflectance properties of vegetation and sediments to satellites such as Sentinel-2. | |||
Processing Plant Biomass Samples https://youtu.be/paa5QlB0EFM
| From sampling vegetation regularly on the study sites, the FAST team may detect seasonal changes on biomass, density and surface/weight ratios for dominant plant species on the intertidal area. This video shows how to process a biomass sample from intertidal areas to estimate these plant variables. | |||
FAST project on-line flood hazard tool: How to use MI-SAFE v0.1 https://youtu.be/Kd5cjinZ5SE
| MI-SAFE is an on-line tool developed by the project. This interactive tool shows different layers of information based on satellite data and validated by field research. With the tool you can extract basic information such as the depth profile along a line or whether there are plants in an area or not. Eventually, this information is translated in the effect of the coastal areas and their plants on the height of waves inland. The first basic demo of this tool (MI-SAFE v0.1) has limited functionalities that are being expanded over the course of the project. The tool is available on-line at fast.openearth.eu.openearth.eu | |||
MI-SAFE: Accessing products and services using the web viewer https://youtu.be/_LIAP8Ngt2A
MI-SAFE: Accessing products and services using the web viewer https://youtu.be/_LIAP8Ngt2A | In this video it is explained how to use the final version of the MI-SAFE viewer and access the underlying data layers. The tool is available on-line at http://fast.openearth.eu/index.htm |
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Wave attenuation over foreshores is typically most relevant during storm conditions that create a surge (wind-induced water level set-up) in combination with high tidal levels. For the MI-SAFE viewer, a water level that has a probability of occurrence of 10%, i.e. once in 10 years, is considered to be the most relevant: this represents a storm that is both frequent enough to be relevant to users’ needs for planning coastal protection (a 1/100 or 1/1000 year condition may seem too extreme) and severe enough to be a serious threat to coastal regions. The representative water levels or hydraulic boundary conditions are derived from a global D-Flow Flexible Mesh model (Muis et al., 2016, Figure 9) that includes tides, storms and hurricanes. The output of this model is mapped to Dynamic and Interactive Vulnerability Assessment (DIVA) segments, so local anomalies can occur for coasts with irregular shapes (bays, estuaries). More extreme or locally tailored conditions are included in the Expert mode of the MI-SAFE viewer, which can take into account hydraulic boundary conditions that are specified by users -e.g. in local coastal management guidelines- or derived from dedicated modelling or field observations at the relevant location.
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Issue type | Detailed issue | Location | Illustration |
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Temporal change; managed realignment | As a result of recent managed realignment, the foreshore is not recognized correctly and wave attenuation is not calculated over the present foreshore. Reasons: 1-The global coastline still follows the former (now outer) levee instead of the present levee. 2-The intertidal elevation map was made using images spanning multiple years; if the intervention occurred after this period, or caused ambiguous values, the area is not included in the map. If the area is not inundated regularly, the intertidal map cannot represent the elevation correctly, and the viewer reverts to using inaccurate SRTM topography. Solution: If this type of area is of interest, apply request application of the Expert Advanced functionality that can incorporate any DEM, to the site. For an example of what results are possible, have a look at one of the FAST Study sites. | Freiston, UK | |
Temporal change or data quality | The viewer does not display the vegetation cover as observed by the eye of the user. Reasons: 1-The vegetation has established recently before the period used to construct the vegetation presence/absence map. 2-Part of the vegetation was covered by clouds and/or water during the period used for the construction of the vegetation presence/absence map. Solution: Apply Request application of the Expert Advanced functionality to the site, using recent and suitable Sentinel imagery for a site-specific vegetation cover. For an example of what results are possible, have a look at one of the FAST Study sites. | Freiston, UK | |
Complex topography; unclear coastline | Although the orientation of the transect in the viewer is correct, the resulting wave attenuation should be regarded with considerable caution: the algorithms in the viewer are made for a single water-land transition. Solution: Apply Request application of the Expert Advanced functionality to the site , defining dedicated transects with output at meaningful locations and process-based calculations that can deal with complex topography. For an example of what results are possible, have a look at one of the FAST Study sites. | Blakeney, UK | |
Incorrect land elevation | The Sundarbans are a very low-lying area; land elevations around +10 MSL do typically not occur. The reason for the high observed elevation is that the SRTM topography used the reflection of the top of the mangrove canopy. Likewise, the intertidal elevation map cannot display this sort of area correctly, as waterlines underneath the canopy are not visible. | Sundarbans, Bangladesh | |
Incorrect bathymetry | On some locations, the edges, i.e. the area near land, of the GEBCO bathymetry appear to be substantially deeper than the offshore areas. From other, not globally available bathymetry products such as EMODNET, we know that this is not true. Solution: On most locations the issue is cosmetic because the use of the intertidal elevation map provides a correct bathymetry where it matters; the calculations are meaningful but the transect looks strange. In the Expert Advanced functionality, detailed bathymetric data can be used to ensure a correct transformation from offshore to nearshore waves. For an example of what results are possible, have a look at one of the FAST Study sites. | Bradwell-on-Sea, UK |
The case study sites
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