Development of Simultaneous Measurement of Physical Parameters In Rivers
Abstract
The description of physical parameters is the basis for a theoretical and applied limnology. The measurement of base data in small and medium rivers and shallow areas of large rivers at the point of view are complicated, time and cost intensive. The presentation focuses on the development of a new instrumentation for simultaneous velocity measurement and on the optimization of the measurement technique to describe the physical habitat describing characteristics, specially the pattern of currents in heterogeneous, well structured rivers. In effort to describe the habitats on small and medium rivers close to the "real world situation", it is a must to improve the description of velocity distribution within river-sites. For analyses of habitats, more or less simultaneous velocity measurements are needed. All known habitat models at the point of time are smoothing point velocities and deal in further steps of analysing habitat availability with mean cell velocities or mean column velocities. By reducing the effort of in situ data collections parallel to a significant increase of data quality, the unpleasing part of the loss of information and the need of velocity simulation within models can be rejected and replaced by time extensive field data collections of "real world velocity distributions". The main goal of the project No. P 14433-TEC, funded by the Austrian Science Fund (FWF), is to develop and test a multifunctioning instrumentation. This new instrument mainly is a combination of a GPS station with 4 acoustic doppler current meters with pressure transducers (NORTECÒ) for physical data collection. Measurement techniques ensure time and cost efficient data collection very close to the "real world situation" by using simultaneously measured data collection within river specific structures. Measured data will be compared by existing methods within in situ measurements at nature like rivers and on the 1:1 scale model of a nature like river site in the hydraulic laboratory of the IWHW. By using the new standardized simultaneous measurement equipment and technique within river specific structures, measuring time will be reduced parallel to a significant increase of velocity data quality. The initial information loss by data aquisition (mean velocity treatment) as well as the resulting information loss by use of simplified simulation models can be avoided by time extensive in situ data collections of "real world velocity distributions".
Key words: simultaneous velocity measurement,multifunctioning instrumentation, field data, measurement technique, habitat model- Publication:
-
EGS General Assembly Conference Abstracts
- Pub Date:
- 2002
- Bibcode:
- 2002EGSGA..27.3140M