New groundwater formation Hamburg
Description
Grid maps for new groundwater formation, calculated with mGROWA (FZ Jülich, 2020).
In the web service, 4 layers are shown:
— Groundwater regeneration of the hydrolog. Year 2019 [Min]
— Groundwater regeneration of the hydrolog. Year 2018 [Max]
— mean annual groundwater regeneration (1991 – 2019)
— mean annual groundwater regeneration (1961 – 1990, climate reference period)
Description:
About a quarter of the rainfall in Hamburg enters groundwater via the soil and thus forms a significant proportion of our daily water supply and is an ecological basis for vegetation and soil as a water storage facility. The rest of the precipitation is mainly determined by evaporation and drainage into the boiling net and into the waters. Currently, 136 million cubic meters of groundwater are being re-formed on the Hamburg area with average rainfall (approximately 770 mm per year). In the dry year of 2019, it was only 75 million cbm, which had an effect on severely falling groundwater levels, lack of soil moisture and partly dry falling water for animals and plants as dry stress. Monitoring the development of new groundwater formation is therefore of particular importance in times of climate change. In addition to climatic changes, sophisticated land and resource management is therefore necessary in order to counteract the growing urban sealing and increasing water consumption with strategies and measures towards a natural water balance.
Data bases and methodology:
The basis for the calculation and presentation of area- and temporally differentiated grid maps of the various water balance components is the grid cell-based water balance model mGROWA of Forschungszentrum Jülich. In mGROWA, the actual evaporation and total runoff in daily resolution with a cell size of 25 x 25 m were initially calculated based on the respective precipitation amounts and climatic influencing variables. The calculated daily values were subsequently aggregated to long-term, annual and monthly periods. After that, the total outflow was divided into different drain components based on the site characteristics. In addition to the grid maps of potential and actual evaporation, total runoff and site characteristics, the grid maps of the runoff components of urban direct runoff, leachate rate, intermediate and drainage drains, and ultimately groundwater regeneration are included in the data compilation. Below are the maps for the average long-term average 1961-1990 (climate reference period) and 1991-2019, the wet year 2018 with very large and the dry year 2019 with very little new formation.
Resources
| Name |
Format |
Description |
Link |
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0 |
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https://geodienste.hamburg.de/HH_WMS_Grundwasserneubildung?Service=WMS&Version=1.3.0&Request=GetCapabilities |
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0 |
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https://daten-hamburg.de/opendata/Grundwasserneubildung/Grundwasserneubildung_HH_2022-10-10.zip |
Tags
- hmbtg
- geodaten
- opendata
- envi