Generalised hydrogeological map of Lower Saxony, 1 : 500 000 - Groundwater quality - Chloride
(HUEK500GWB_CL)
The generalised hydrogeological map of Lower Saxony, 1 : 500 000 - Groundwater quality: Chloride content, shows the evaluation of a representative sample of chloride concentrations taken from the LBEG laboratory database. The data collected in the period 1967-2000 were averaged twice. Where groundwater monitoring wells were subject to multiple analyses, the averages of the available analysis results were formed. In addition, the data from all sampling wells in a 2000 m radius were averaged again.
The classes were formed taking the negligibility threshold and the potable water regulations (Trinkwasserverordnung - TVO) limit value of 250 mg/l into consideration. Increased concentrations which are obviously caused by point-source anthropogenic inputs (e.g. abandoned landfills, mining spoil heaps), are not included in these generalised maps. The chloride levels are shown in depth stages without reference to the local hydrogeological situation. The data therefore cannot be compared without taking the respective hydrogeological situation into consideration (e.g hydrogeological layering), nor can the data be adopted for detailed investigations.
The lowest chloride concentrations in Lower Saxony are in the Harz and Solling regions, at 5-10 mg/l and in the Lüneburger Heide region at 10-30 mg/l. Levels above 50 mg/l cannot be readily explained by atmospheric input and accumulation as a result of evapotranspiration and are generally the result of geogenic or anthropogenic groundwater salinisation.
In Lower Saxony, very strong geogenic chloride groundwater salinisation with concentrations between 15,000 and 16,000 mg/l can be found primarily along the coast and in the Elbe, Weser and Ems estuaries (coastal salinisation by seawater) . Outside of the seawater salinisation zones the chloride levels near the coast lie between 30 and 50 mg/l.
Another cause of geogenic groundwater salinisation is leaching of subsurface salt rocks. One example of this are the increased chloride concentrations often found in flood plains (e.g. the Elbe near Lauenburg and Gorleben, Jeetzel, Wümme) and which are the result of ascending leachate from salt structures. Small-scale salinisation can often also be encountered around salt domes in the Hannover (Ronnenberg, Sarstedt), Salzgitter and Braunschweig (Wolfenbüttel; Asse) regions, and in Lower Saxony's mountain country. Moreover, increased chloride concentrations can also be found in parts of Lower Saxony's mountain country where saline sequences occur at shallow depths (Zechstein, Upper Bunter, Middle Muschelkalk, Middle Keuper, Upper Jurassic Münder Marl).
North of Hannover the influence of Lower Cretaceous marine mudstone deposits leads to an increase in chloride levels to 50-100 mg/l in the thin Quaternary deposits.
Informations about data
- Editing state:
Erfassung bzw. Erstellung der Daten ist abgeschlossen (completed).
- Date of last publication:
01.06.2008
- Information about data origin:
An Datengrundlagen sind eingegangen:
- Daten des NIBIS, einzelner Wasserversorger und des Niedersächsischen Landesbetriebs für Wasserwirtschaft, Küsten- und Naturschutz (NLWKN), Stand: März 2000
Contact person
Phone:
+49 511 643-3613
Fax:
+49 511 643-533613
Online access to data
To access the data online you can use the following applications/services:
Distribution information
Common informations (order proccess, product choise, prices):
Kostenfreier Download über den NIBIS-Kartenserver oder Kosten über den Datenvertrieb des LBEG entsprechend der Gebührenordnung
Data formats
- ArcGIS-Shapefile
(
Version:
unknown)
- JPEG
(
Version:
unknown)
- PDF
(
Version:
unknown)
- TIFF
(
Version:
unknown)
Data medium
- CD-ROM (cdRom)
- Ausdruck (hardcopy)
- DVD (dvd)
Distribution contact
Phone:
+49 511 643-3354
Fax:
+49 511 643-533354
Additional information about the data
- Format of data:
digitale Karte in Raster- oder Vektorform (mapDigital)
- Topic:
Geowissenschaften
(geoscientificInformation)
- Key words:
sgd_Hydrogeologie, inspireidentifiziert, opendata, NIBIS-Metadaten, opendata
- Key words GEMET:
Geology
- Thesaurus name:
GEMET - INSPIRE themes, version 1.0
- Thesaurus date of puplication:
2008-06-01
- Geometry type:
Punkt (point)
- Scale:
1:500000
- Coordinate system:
4647; ETRS89 / UTM zone 32N (zE-N)
(Europäisches Terrestrisches Referenzsystem von 1989 / Universale Transversale Mercatorabbildung Zone 32N)
- Altitude reference system:
DE_DHHN92_NH
- Reference layer:
Datenbestand (dataset )
- Language:
ger
- Character set:
utf8
Access- and security restrictions
- Security classification:
unbeschränkt (unclassified)
- Restriction of application:
Es gelten keine Zugriffsbeschränkungen.
Information about content (auto detected)
- Amount datasets/features:
keine Angabe
- Spacial notation:
vector
- Eastern longitude:
6.5475
to
11.7416
- Northern latitude:
51.225
to
53.9343
About this data description
- Metadata standard:
Standard
ISO 19115
,
version
ISO 19115:2003/Cor. 1:2006 (E)
- Metadata status:
10.12.2024
- Metadata language:
ger
- Metadata character code:
utf8
Metadata contact