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| Titel |
INSERT YOUR ABSTRACT TITLE A New Simple Suspended-Load Sampler: Continuous Particulate Matter Collection from Rivers with Low and High Suspended Matter Load |
| VerfasserIn |
Martin Kralik, Hermann Miesbauer, Franko Humer, Hermann Oberndorfer |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250043594
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| Zusammenfassung |
| Please fill in your abstract text. Suspended particulate matter (SPM) or suspended load in
waters is the part of the stream load that is carried for a considerable period of time in
suspension. Long term suspended sediment monitoring is hampered by the limited sample
size or enormous investments in equipment and/or working hours. In addition many
samplers are limited to easily accessible sampling points equipped with electric
power supply or to certain types of streams and cannot operate unattended in case of
floods. The sorption characteristics of the suspended particulate matter (wash load)
have been recognized as important transporters of natural and anthropogenic trace
constituents. To allow repeated analyses sometimes several grams of dried SPM are
needed.
All parts of the sediment sampler are available as spare parts in hardware stores and made
of polyvinylchloride (PVC). The inlet device is connected with the sampler by a tubing of
several meter length. Without a pump the sampler can be positioned at a safe place lower than
the inlet device to allow a continuous flow. Only a small portion (0.001-0.002 l/s) of the river
water flows down through the central pipe by gravitational force to the bottom of the
container. Due to the considerable larger diameter of the container the water rises very
slowly (1-3 hours) and leaves the container at a small overflow-pipe allowing a
nearly complete settling and/or flocculation (80-90%) of the suspended load in the
container.
The sampler was tested in an alpine torrent and two rivers in flat areas. The newly
developed sampler offers following advantages. The sampler (1) is inexpensive and robust,
(2) operates in case of small cascade or cataracts (>0.5 m) without power supply, (3) can be
used singly or in lateral or vertical nests, (4) allows continuous settling and flocculation
without perturbation by vibrating movements of the sampler (5) is resistant to plugging and
clogging by coarser particles and plant debris, (6) has a sampling efficiency of 80 – 90 % in
field tested sites. |
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