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表5. Biotモデルに使用するパラメータ
Parameter Value
sediment/water sound speed ratio (ν) used in fluid model 1.16
sediment/water mass density ratio (ρ) used in fluid model 2.03
Ratio of imaginary to real sediment wavenumber (δ) used in fluid model 0.01
Porosity of sediment (β) 0.385
Mass density of sand grains (ρ〓) 2690kg/m3
Mass density of water (ρ〓) 1023kg/m3
Bulk modulus of sand grains (Κ〓) (value used in EDFM) 3.2×1010 Pa
(3.45×1010 Pa)
Bulk modulus of sediment frame (Κb) 4.36x107 -2.08×106 i Pa
Shear modulus of sediment frame (μ) 2.92x107 -1.8×106 i Pa
Bulk modulus of water (Κ〓) 2.395×109 Pa
Viscosity of water (η) 0.00005 kg/〓
Permeability of sediment (〓) 2.5×10-11m2
Tortuosity of sediment (α) 1.35
Bottom relief spectral strength (w2) for the range 0.02 to 2.0 cycles/cm 0.0036cm4
Bottom relief spectral exponent (γ2) for the range 0.02 to 2.0 cycles/cm 3.04
Bottom relief spectral strength (w2) for the range 2 to 5 cycles/cm 1.0847 cm4
Bottom relief spectral exponent (γ2) for the range 2 to 5 cycles/cm 5.13
Sediment density spectral strength (w3) 2.34×10-6 cm3
Sediment density and sound speed spectral exponent (γ3) 4
Compressibility fluctuation ratio (ζ) -2.84
 
図49. 観測データとBiotモデルとの比較







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