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RE: Active and base layer thickness in multiple sediment ratios.

Niraj Bal Tamang, modified 3 Years ago.

Active and base layer thickness in multiple sediment ratios.

Advanced Augur Posts: 34 Join Date: 4/26/21 Recent Posts
What is the most efficient way to estimate the thickness of active layer and base layer? How do they differ for single sediment fraction and multiple sediment fraction? If we have  grain size distributions of different sections of the reach, can we use all the distributions to get an average and assign the sediment fractions based upon that or just consider the upstream boundary grain size distribution?
Thank you
Victor Chavarrias, modified 3 Years ago.

RE: Active and base layer thickness in multiple sediment ratios.

Famous Fortune teller Posts: 97 Join Date: 4/24/20 Recent Posts
That is a million dollar question. First is that there is no active layer in case of a single fraction. Only in mixed-size sediment simulations there is an active layer. The active layer represents the part of the bed that interacts with the flow. This depends on the bedforms that rework the surface of the bed, which also depends on the timescale of interest. In this paper we explain concepts of the active-layer model. 
Niraj Bal Tamang, modified 3 Years ago.

RE: Active and base layer thickness in multiple sediment ratios.

Advanced Augur Posts: 34 Join Date: 4/26/21 Recent Posts
Thanks a lot. The paper was really helpful to understand the answer I was looking for. Is there an example code of the sediment files for the ISLE and HANNEKE model to understand how the sediment fractions are entered differently?
Victor Chavarrias, modified 3 Years ago.

RE: Active and base layer thickness in multiple sediment ratios.

Famous Fortune teller Posts: 97 Join Date: 4/24/20 Recent Posts
Unfortunately the ILSE and HANNELE models are only implemented in a research branch of the code.