1,726,878 research outputs found
Biodiversiteit en abiotische metingen op de Slow Mill locatie off-shore Texel in 2019. NIOZ Report 2020-06
No full textIn 2019 NIOZ was involved in biodiversity research and the measurement of abiotic conditions at a location where a wave energy converter device (SLOWMILL) will be placed. The location lies 4 km offshore Texel and has a water depth of 12 meter.
In February 2019. Fauna was sampled with a boxcore. The analyses of these samples showed that abundance and biodiversity is relatively low, and typical for the high energetic coastal environment. The addition of hard substratum, being a measurement frame, showed that local abundance and biodiversity increased enormously. With 18 species which were not found in the sandy bottom, biodiversity increased with ~ 50%. The densities of macro faunal specimens on the hard substratum was 400 times higher than densities in the natural soft sediments.
The measurements of the physical environment showed that the location is dominated by along shore tidal currents of approximately 0.5 m/s. The residual current is in northward direction. During a south westerly storm (8 Bft) near bottom currents were over 1 m/s. Significant wave heights during the storm was 2.5 meter, with a maximum of 4.8 meter. Mean wave period was 3.5 seconds. Peak period is 5.8 seconds and linked to waves from a northerly direction.
Temperature, salinity and turbidity measurements show a well defined tidal periodicity. The turbidity data clearly show the effect of wind and wave conditions on the total suspended matter. Peak concentrations were measured after the storm when resuspended material resettles. The data also suggest that there is lateral transport of suspended material, most likely derived from the bordering shallow Wadden Sea
NIOZ jetty hourly data for temperature and salinity
No full textGeneral DOI for the NIOZ jetty time series of hourly values of temperature and salinity since 2001.
NIOZ jetty LON=4.789E LAT=53.002N, measurements at -1.5 meter NAP. Derived product from 10 minute calibrated data. Separate calibration measurement at 2 week intervals
NIOZ jetty hourly values temperature and salinity for 2002
No full textNIOZ jetty LON=4.789E LAT=53.002N , depth of sensors -1.5 meter NAP. Derived product from 10 second calibrated data
NIOZ jetty hourly data for temperature and salinity for 2001
No full textNIOZ jetty LON=4.789E LAT=53.002N , depth of sensors -1.5 meter NAP. Derived product from 10 second calibrated data
NIOZ jetty hourly data for temperature and salinity for 2023
No full textNIOZ jetty LON=4.789E LAT=53.002N, using EXO sensor at depth of -1.5 meter NAP. Derived product from 10 second calibrated data. Separate calibration measurement at 2 week intervals
NIOZ jetty hourly data for temperature and salinity for 2013
No full textNIOZ jetty LON=4.789E LAT=53.002N, using EXO sensor at depth of -1.5 meter NAP. Derived product from 10 second calibrated data. Separate calibration measurement at 2 week intervals
NIOZ jetty hourly data for temperature and salinity for 2003
No full textNIOZ jetty LON=4.789E LAT=53.002N , using EXO sensor at depth of -1.5 meter NAP. Derived product from 10 second calibrated data
NIOZ fyke programme Stuifdijk
No full textThe Royal NIOZ collects data on the Wadden Sea fish community using traditional fixed gear at a specific location (Lat 52.997N, Long 4.775E) since 1960. The fixed gear is known as a 'kom-fyke' and is a passive fish trap consisting of a 200-m net running from the beach towards deeper waters (the stretched mesh size is 20 mm). This net guides migrating fish towards 2 chambers / traps and into a fyke where they can be collected. The catch is collected each day in spring (late March to early July) and in fall (late August to early November) and netting is removed in the summer (due to algae) and winter (due to storms). This data summarises the catch information as seasonal catch per unit effort (total numbers of fish caught per season, divided by the total number of fishing days in the season), for each year 1980-2019. Seasons are spring and fall, as defined above.
NB Dec 2025: datafile was corrected to include a larger period of years, two fyke locations (1 = Stuifdijk and 3 = Schanserwaard), and a data correction due to earlier errors
NIOZ jetty Marsdiep high water time series data for 2018
No full textNIOZ jetty (LON=4.789E, LAT=53.002N) Marsdiep biological time series. 40 samples a year, weekly in growing season, biweekly outside of growing season. Secchi depth and bucket sample of surface water at high tide (North Sea waters) with subsequent analysis of T, S, TSM, TP, PO4, NO3, NO2, NH4, Si, DIC, Chla
NIOZ jetty hourly data for temperature and salinity for 2015
No full textNIOZ jetty LON=4.789E LAT=53.002N, using EXO sensor at depth of -1.5 meter NAP. Derived product from 10 second calibrated data. Separate calibration measurement at 2 week intervals
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