A Coupled Model of the 1D River Network and 3D Estuary Based on Hydrodynamics and Suspended Sediment Simulation
Table 1
Parameters of the modeling.
Settings
Description
1D
Time steps
Based on the scope of model, the time step of the 1D model is 10 s
Roughness coefficient
This coefficient depends on the physical properties of the riverbed. At Beijiang, from upstream boundary to Sanshui 0.026~0.045, from Sanshui to downstream boundary 0.015~0.03; at Xijiang 0.02~0.03; at Dongjiang, from upstream boundary to Shilong 0.025~0.045, from Shilong to downstream boundary 0.015~0.036; at the mouth of the river network 0.01~0.02
Particle diameter
In channel, the median particle diameter of suspended sediment is about 0.01~0.040 mm, and the median particle diameter of bed material is about 0.17~0.44 mm.
Sediment transport capacity
, where ; 0.0012~0.0016.
Recovery coefficient relating to the saturation
When the channels are in the deposition conditions, a value of 0.25 is applied; while, in the erosion conditions, a value of 1.0 is applied.
3D
Time steps
, ; thus, the internal model is 10 s and the external model is 0.5 s.
Bottom roughness
, , where , cm.
Particle diameter
The median particle diameter is 0.003~0.009 mm during the spring tide period.
