河床上における存在量を考慮した浮遊微細粒子輸送モデル A TRANSPORT MODEL OF FINE SUSPENDED PARTICLES CONSIDERING THE AVAILABILITY ON THE BED
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The understanding of the transport process of suspended fine particles in rivers becomes important from a viewpoint of biological environment in rivers. In this study, we propose a new transport model of suspended fine particles in rivers considering the availability of fine sediment on the bed. An availability function of fine sediment on the bed is introduced to take into account the reduction of the entrainment rate through lack of fine sediment on the bed. In a sample calculation with the assumption that the flow is in the unsteady normal flow condition, it is shown that the model can delineate an important fact that the SS concentration increases only up to some limit even if the bed shear stress increases. In addition, we applied the model to a field observation and show that the model can describe an important feature that the SS concentration is higher at the begining of a flood and decreases afterward despite large discharge.
- PROCEEDINGS OF HYDRAULIC ENGINEERING
PROCEEDINGS OF HYDRAULIC ENGINEERING 49, 907-912, 2005
Japan Society of Civil Engineers