Regionalised flow characteristics NRW

Description

2.) Explanations for the initial calculation of the regionalized outflow parameters in 2012 on the basis of the water stationing map 3C Since the outflow parameters MNQ and MQ are only available selectively at the levels and not nationwide for NRW, the characteristic values MNQ and MQ were derived from level data with the help of a regionalization procedure. The regionalization of the runoff parameters was realized for each node in the water network of the NRW Water Stationing Map, edition 3C (GSK3C) with about 22,000 refined subareas. A significant outflow is required for the assessment of discharges. Water analysis of the LANUV of runoff series at 72 levels of different catchment areas and locations in North Rhine-Westphalia showed that the size Q183 (= 50 percentile of the runoff) correctly depicts the decisive runoff for this purpose. At present, however, the data for Q183 are also not available across the board. Therefore, if no representative level data for Q183 are available for the discharge site to be considered, the determined 0.5 MQ can be calculated alternatively on the basis of the above evaluation. It should be noted that in the context of regionalisation, no distribution of the runoff has taken place in the case of water branches. Discharge is understood to mean a branch of water that merges again into the same body of water (identical water index). A bifurcation, on the other hand, is a branch of water that initiates into other waters (deviating water index). 3.) Transfer to the current water station map 3E Since August 2022, ELWAS-WEB has been converted to the GSK3E with the associated specialist procedures. This also led to the need to convert the data on the modelled outflow characteristics MQ and MNQ to the GSK3E. Since the characteristic values were not recalculated, the characteristic values from the initial calculation were transferred to the water geometries of the GSK3E. Only the details of the donations were transmitted. The outflow parameters for MQ and MNQ were then recalculated on the basis of the transferred donations and catchment area sizes of the GSK3E. The donation values were transferred on the basis of the GSK3C to the associated water sections of the base catchment areas of the GSK3E. If the water section of the GSK3E was already present in the GSK3C, the donation information was transferred geometrically. If the water section of the GSK3E was not yet available in the GSK3C, the donation information was transferred spatially from the nearest water body. For the flowing waters of the GSK3E, information on MQ is now available for NRW for all water sections. For MNQ, data are only available for the waters that were already present in the GSK3C, where spatial transmission was omitted. However, the data for MQ and MNQ differ in part from the GSK3C values, as catchment area sizes have changed on the basis of GSK3E. As in the modelling based on the GSK3C, water branching (discharge routes, bifurcations) are not taken into account. Q183 (= 50 percentile of the outflow) is used as a substitute with 0.5 MQ, because where no level data can be used.

Resources

Name Format Description Link
0 https://www.opengeodata.nrw.de/produkte/umwelt_klima/wasser/oberflaechengewaesser/reg_abflusskennwerte/reg-abflusskennwerte-gsk3e_EPSG25832_Shape.zip
0 https://www.opengeodata.nrw.de/produkte/umwelt_klima/wasser/oberflaechengewaesser/reg_abflusskennwerte/reg-abflusskennwerte-gsk3e_EPSG25832_Geodatabase.zip

Tags

  • q183
  • opendata
  • regionalisierung
  • mnq
  • abfluss
  • lanuk
  • mq
  • abflusskenngröße
  • abflusskennwert
  • abflussspende

Topics

  • ENVI

Categories