Numerical Simulation of the Flow in Black Lake, Alaska
by J. Sanford, (Graduate Research Assistant, IIHR — Hydroscience and Engineering, The University of Iowa, 100 C. Maxwell Stanley Hydraulics Laboratory, Iowa City, IA 52242: E-mail: johnthomas-sanford@uiowa.edu), B. W. Hobbs, (Graduate Research Assistant, IIHR — Hydroscience and Engineering, The University of Iowa, 100 C. Maxwell Stanley Hydraulics Laboratory, Iowa City, IA 52242: E-mail: bwhobbs@engineering.uiowa.edu), and A. N. Papanicolaou, (Associate, Proffessor, IIHR — Hydroscience and Engineering, The University of Iowa, 100 C. Maxwell Stanley Hydraulics Laboratory, Iowa City, IA 52242: E-mail: apapanic@engineering.uiowa.edu)
pp. 1-12, (doi: http://dx.doi.org/10.1061/40792(173)432)
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| Document type: |
Conference Proceeding Paper |
| Part of: |
Impacts of Global Climate Change |
| Abstract: |
Black Lake, Alaska, USA has historically been a significant juvenile salmon habitat. More recently, increase sediment transport down the Allec River system has forced a change in the sediment inflow to Black Lake. Over the past 50 years, the Allec River has carried enough sediment to build a sandbar across a portion of the lake and effectively reduce the recirculation and volume in the lake. This sandbar has also caused a major shift in flow from the north channel of the Allec River to the south channel near the lake outlet, ths bypassing most of the lake volume. This reduced volume and circulation poses a severe threat to juvenile salmon and overall salmon population in the region. Numerical flow and sediment simulation in the Allec River and Black Lake system utilized here to predict future changes based on recent field data. With the advancements in numerical modeling and data presentation, computer models are an attractive engineering tool. Two models will be used here in combination to produce an overall picture of the system. First, the Steep Stream Sediment Transport 1D (3ST1D) model will be used to predict the flow and sediment transport of the Allec River. Then, the commercial SMS package will be used to model the Lake. Using the results of the 3ST1D as inputs for the SMS model, it will be possible to examine the velocity vectors, recirculation patterns, and shear stresses in the lake. The resulting sediment transport parameters will be examined in order to predict further loss of lake volume and juvenile salmon habitat. |
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