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IS-MOBIL-Mobilitetsprogr.f.utl.Ph.D-stu

Dual-frequency ADCP measurement to quantify suspended sediment concentrations and to determine grain size distribution

Tildelt: kr 52 000

Prosjektleder:

Prosjektnummer:

211155

Prosjektperiode:

2012 - 2012

Fagområder:

The present project proposes to develop a new method to measure suspended sediment concentrations and their grain size distribution with a dual frequency acoustic Doppler current profiler (ADCP). This is of high importance since sediments have a strongly negative impact on any hydropower plant. With the new measurement method it will be possible to extensively assess incoming amount of sediments in a reliable, easy to handle and modern method. This is of high interest to the hydro power industry as well a s the government and local stakeholders. Having more detailed information about the sediments being transported in a river, the hydro power plant can be planned, built, and operated much more efficiently. For example, the life time prediction of a hydropo wer plant at a river with high concentration would be very efficient. With the ongoing worldwide climate change, Norway could also be faced with an increasing amount of suspended sediments in the rivers. This is because the glaciers tend to melt faster th an expected and due to this activity there is an increased suspended sediment concentration in some rivers. Another risk for an increased suspended load concentration in Norwegian rivers is the future way of running a hydropower plant. Hydropower peaking could be one reason for re-suspension of fine material. All these facts lead to the need of having a reliable and easy to use method for measuring the suspended sediment concentration in a river wherever it is located around the world. Our intention is to use the NTNU channel in a single experimental program to meet the objective to investigate the feasibility of simultaneous use of two ADCPs of different frequencies to measure both suspended sediment concentration and particle size. With its large depth of over 2m is the channel facility at NTNU an outstanding hydraulic flume where the dimensions fit perfect for the proposed study and will promote the hydraulic laboratory facilities at NTNU.

Budsjettformål:

IS-MOBIL-Mobilitetsprogr.f.utl.Ph.D-stu