Water survey
Under water measurement refers to the determination of shape and depth of a water bottom (lake bottom, river and river bed ) by a precisely controlled boat or survey vessel .
Most important measurement methods
The depth measurement is carried out with a hand plummet , rod or echo sounder , the position is determined by line bearing (straight measuring profiles), area bearing (measuring grid) or GPS .
With modern measuring equipment, the depth information obtained by means of the echo sounder is not registered separately from the position information , but coupled to it, digitally stored and displayed graphically on the screen for control purposes. The measurement data are then processed into a digital terrain model of the seabed.
The previously prevalent pole plumbing is now only used in tributaries or shallow lakes, but can provide additional data on the type of water bed (sand, gravel, silt , etc.) and its vegetation . Sometimes the data is also supplemented by measuring water temperature or current .
Areas of application
The most important areas of application for water surveying are:
- Hydrology and limnology
- Determination of the amount of water , possibly also the flow
- Locating shoals or obstacles in a fairway or near the bank
- Structural inspection
- Determination of sedimentation and dredging mass.
See also
Web links
- Danube survey (Donau-Technik)
- Water level calculations Danube (TUW, D. Gutknecht) (PDF file; 2.70 MB)
- Hydrogr. Measurements (specialist conference Vienna 2003) - June 2019 no longer available