Aim

The aim of the field work is to gather in-situ data from the intertidal flat areas with covering different aspects. Using this data it is possible to establish what habitats are present in the Wadden Sea and what parameter values distinguish each of the habitats. This information is used to interpret the signals and the information products derived from the satellites correctly. Together with the routine monitoring data, the in-situ data is also used to validate the classifications and products created.

 

Research areas

The field work takes place in specific areas of interest in both Schleswig-Holstein and in Lower Saxony. The areas of interest in Schleswig-Holstein comprise the Halligenwatt in North Frisia and Blauort in the Wesselburen mudflats off the coast of Dithmarschen. Mapping in Lower Saxony takes place in the mudflats to the rear of the island of Norderney and in the Jade Bight.

The test areas from the DeMarine Umwelt project are also still part of the fieldwork, to enable the verification of further classifications in known intertidal areas and to continue the time series that have been started. In addition, we focus on areas with a high level of variability, in order to be able to assess the influence of variability on the results.

 

Data and analysis

Field data

In-situ data are captured using standardised procedures and using a protocol developed in the previous project. This protocol includes approx. 85 parameters, which are recorded at every measurement point. The parameters include, for example water coverage on the sediment, plants and animals present as well as surface structures. In addition, some metadata are recorded such as the position or the weather conditions. At selected locations sediment samples are taken, which undergo mineralogical and sedimentological analysis. This involves, among others, determining particle size distribution in order to establish the precise composition of the sediment. In order to be able to assess the influence of the water content of the sediment on the image signal, the water content of some of the sediment samples is also determined.

 

   
 Mapping close to Stenodde, Amrum. Colour determination of the sediment during mapping close to Vollerviek.