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  • This dataset contains X-band (9.475 GHz) weather radar measurements from the TU Delft IRCTR drizzle radar IDRA. It includes plan-position indicators (PPI) of co-polarised reflectivity measurements at horizontal polarisation. IDRA is mounted at the top of the Cabauw tower and is scanning horizontally at a fixed low elevation angle, covering a radius of 15 km (30 m range resolution) or 1.5 km (3 m range resolution). The antenna of IDRA is rotating at a speed of one round per minute. The dataset contains one PPI every five minutes.

  • Groundwater levels at Cabauw have been measured since August 2003 in two fields south of the tower. Nine piezometers were placed in a row. Initially, 6 of those piezometers contained pressure transducers (of the brand Keller) to measure levels automatically every 4 hours. On 9 July 2010, the temporal resolution was increased to hourly. Several sensors have stopped working since 2003. Piezometers that were not measured automatically were measured during each filed visit, which was initially every 2 weeks, but has become longer towards the end of the measurement period.

  • Discharge has been measured at three locations. At these locations, measurement weirs have been installed in May 2007 to estimate discharges accurately. A V-notch weir is used to measure the inflow of surface water into the catchment near the Wielse Kade (Qin). Trapezoidal Rossum weirs have been installed to measure outflow (Qout1 and Qout2), of which the stage-discharge relations have been obtained by laboratory calibration. The uncertainty associated with the discharge measurement can be considerable in some cases.

  • Groundwater levels at Cabauw have been measured since August 2003 in two fields south of the tower. Nine piezometers were placed in a row. Initially, 6 of those piezometers contained pressure transducers (of the brand Keller) to measure levels automatically every 4 hours. On 9 July 2010, the temporal resolution was increased to hourly. Several sensors have stopped working since 2003. Piezometers that were not measured automatically were measured during each filed visit, which was initially every 2 weeks, but has become longer towards the end of the measurement period.

  • Discharge has been measured at three locations. At these locations, measurement weirs have been installed in May 2007 to estimate discharges accurately. A V-notch weir is used to measure the inflow of surface water into the catchment near the Wielse Kade (Qin). Trapezoidal Rossum weirs have been installed to measure outflow (Qout1 and Qout2), of which the stage-discharge relations have been obtained by laboratory calibration. The uncertainty associated with the discharge measurement can be considerable in some cases.

  • This dataset contains S-band (central frequency of 3.298 GHz) radar measurements from the TU Delft transportable atmospheric radar TARA. It includes profiles of the equivalent reflectivity factor. Further, the horizontal wind (speed and direction) and the vertical Doppler velocity profiles are supplied. TARA is placed at the remote sensing site at Cabauw. It is a very sensitive profiling radar providing time-height indicators.

  • Unvalidated drop size distributions as measured by a 2D Video Distromenter at the remote sensing site at Cabauw, averaged over 1 minute periods, with diameter classes of 0.10 mm. Drops larger than 6.00 mm and drops with velocities that deviate more than +-40% of the theoretical fall velocities corresponding to the drop diameter are discarded. Data are available from 2008-07-01.

  • Volumetric soil moisture contents have been measured daily between 6 november 2003 and 19 August 2010 with a TDR set-up developed by Heimovaara and Bouten consisting of six arrays of six sensors between 5 and 73 cm below the soil surface. The six arrays were positioned on the perimeter of a circle with a diameter of 9 m with equal distances. The TDR was calibrated by taking 6 undisturbed soil samples (diameter: 20 cm; height: 20 cm) into the lab and comparing independently measured volumetric soil moisture contents to the TDR measurements. Measurements were performed at midnight local time, without taking daylight savings time into account.

  • Validated soil temperature profile and soil heat fluxes at Cabauw on a 10-minute basis. For more information about how to interpret the data, please read: https://cdn.knmi.nl/knmi/pdf/bibliotheek/knmipubTR/TR384.pdf. Please note: Due to dataset maintenance, data uploading has been halted temporarily since 01-06-2021 for an unspecified time.

  • Validated and gapfilled meteorological profile observations of wind speed, wind direction, temperature, dew point and visibility from the 200 m Cabauw tower on a 10-minute basis. For more information about how to interpret the data, please read: https://cdn.knmi.nl/knmi/pdf/bibliotheek/knmipubTR/TR384.pdf. Please note: Due to dataset maintenance, data uploading has been halted temporarily since 01-06-2021 for an unspecified time.