- Title: ClimateBasis Zackenberg - Zackenberg River Hydrometric data - Discharge at a cross section of the river, (m3/s)
- Description: River discharge measured with continuous water level measurements converted by a stage-discharge relation based on manual discharge measurements. 15 min sample values in m3/s. The hydrometric station is located ~2.5 km upstream of where the Zackenberg river enters the fjord. After 2014, water level in the river is measured by sensors logging the vertical distance from the bridge down to the water surface, backed up by pressure sensors in the river. The time series starts in 1996. Before 2014, water level was measured by a distance sensor mounted on a gallows rack on the river bank, supported by pressure sensors in the water. The station was moved once because of bad snow conditions, and was also exposed to floods, in some years this resulted in downtimes for the station and subsequent gaps in the timeseries (see timeseries comments in the metadata text file for details). Nearly every year, a glacier lake outburst flood (GLOF) is released from the A.P. Olsen glacier which lies in the northwestern corner of the river catchment. Several of these GLOFs have modified the river bed to a large degree, and a new stage-discharge relation has had to be established afterwards. The discharge measured during the GLOF period is subject to larger uncertainties than other periods due to high water levels and changing bed conditions. Zackenberg river freezes in Autumn and has no flow through winter, except in rare years when the GLOF happens during the winter months. The spring flow runs on top of the winter ice until the channel has melted down to the river bed, and the river stage in this period needs to be corrected for the influence of the ice in order to calculate correct discharge. Ice affected periods at both the start and the end of the season are corrected for by ice correction factors based on manual discharge measurements. For years when manual discharge measurements could not be made, data for the ice-affected periods are excluded from the time series. Years where this has not been done are given in the metadata. Please read the metadata file provided with the data for comments related to the data in this timeseries. Zackenberg River Hydrometric data:Zackenberg River Hydrometric data ClimateBasis Zackenberg:The ClimateBasis programme monitors climate and hydrology in Zackenberg, Kobbefjord and Disko (Qeqertarsuaq) and is run by Asiaq - Greenland Survey. The collected data build base-line information on climate variability and trends for all the other sub-programmes within GEM and serve as a trustworthy foundation for adaptation strategies for the Greenlandic society. The stations are embedded in Asiaq’s extensive climate and hydrology monitoring network. Furthermore, the run-off data is delivered to the World Hydrological Cycle Observing System (WHYCOS) and the Global Runoff Data Centre (GRDC) networks.
- DOI: 10.17897/A308-6075 - https://doi.org/10.17897/A308-6075
- Location/site: ClimateBasis Zackenberg (Accurate site unknown) - -20.57, 74.47 (lon-lat wgs84)
- Date span of the dataset: 1996-01-01 - 2022-09-23
Data originator, license and how to download the dataset
Download the dataset via this link (registration needed): http://data.g-e-m.dk/log-in/data-tables?doi=10.17897/A308-6075
Variables measured / columns in dataset
|Date of observation
|Time of observation (UTC)
|Data comments: Timeseries comments for the Zackenberg Hydrometry station: 1995: Station established on the western side of the river. 1996: Data time series starts. 1998: Station was moved to the eastern side of the river 1999: Station was destroyed by the spring flood in June. Stage was logged manually until a new station was established on August 14. 2005: Station was taken by flood in July. New station was established on August 5. 2012: Station was taken by flood in August. Preliminary gauge station established after two days. 2014: The station was moved to the newly constructed Zackenberg bridge. Sensor change from SR50A to Vegapuls WL61. 2020: No data from ice affected periods in spring and autumn. 2022: no data from ice affected period in autumn.Years with no ice correction implemented: 1996, 1998, 1999, 2001, 2013.
|Flag assigned during quality control. Flag = "fair" is assigned instead of good to indicate where a value is interpolated, or, where only 1 timeseries has been used where it is normal to take the average of 2 timeseries. Flag = unknown is equivalent to the flag "good" or "fair" and is due a change in proceedures. Work is underway to update these flags.