砂層から水中への塩分拡散について
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It is an important problem to estimate the changing process of water quality in reservoir constructed at river mouth. To predict the mass transfer of salinity from pore-water in sand-bed to surface water, authors measured experimentally the variation of salinity distribution in sand-bed and surface water. In order to measure the concentration of pore-water in sand, the probe are made for its purpose shown in Fig. 4. Two kinds of experiments are done, one is for the static surface water ; ”static diffusion”, and the other is for the flowing surface water ; ”flowing diffusion”. The observed variation of vertical distribution of salinity are shown in Fig. 6 and Fig. 8. To describe the process of diffusion in porous sand-bed, authors make use of the model that sand-bed is assumed semi-infinity in depth, and initial condition ; t=0,S=S_*=const., and the boundary condition is assumed constant value given by eq. (7). With this model, the variation of salinity in porous bed is described by eq. (4), which fits with experiments as shown in Fig. 10. From experiments, the coefficients of diffusion are obtained in Table 1 for static diffusion. In these case authors propose the diffusion process in porous media and showed that D must be given in the form of eq. (15). In the case of flowing diffusion, the coefficients of diffusion in surface region of sand are increasing in proportional to Re-number at Re>500,but in the deep layer D/√^3<λ>D_M is seemed to be constant as shown in Fig. 4. Total mass transfer from sand-bed to surface water till the time t, is given by eq. (29).
- 山口大学の論文
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