A regional modeling system of predicting the transport of radionuclides in coastal sea regions

Title
A regional modeling system of predicting the transport of radionuclides in coastal sea regions
Author(s)
정경태; Brovchenko; Maderich; 김경옥; Qiao
KIOST Author(s)
Kim, Kyeong Ok(김경옥)
Publication Year
2017-08-07
Abstract
We report in this talk a recent progress in developing a modeling system of predicting three-dimensional transport of radionuclides coupled with multiple-scale circulation, wave and suspended sediment modules, keeping in mind the application to coastal sea regions with non-uniform distribution of suspended and bed sediments of both cohesive and non-cohesive types. The model calculates the concentration fields of dissolved and particulate radionuclides in bottom sediment as well as in water column. The transfer of radioactivity between the water column and the pore water in the upper layer of the bottom sediment is governed by the diffusion process. The phase change between dissolved and particulate radionuclides is written in terms of absorption/desorption rates and distribution coefficients. The dependence of distribution coefficients is inversely proportional to the sediment particle size. The hydrodynamic numerical model SELFE that solves equations for the multiple-scale circulation, the wave action and sand transport on the unstructured grids has been used as a base model. We have extended the non-cohesive sediment module of SELFE to the form applicable to mixture of cohesive and non-cohesive sedimentary regimes by implementing an extended form of erosional rate and a flocculation model for the determination of settling velocity of cohesive flocs. Calibration of the sediment transport model in the Yellow Sea usinn to coastal sea regions with non-uniform distribution of suspended and bed sediments of both cohesive and non-cohesive types. The model calculates the concentration fields of dissolved and particulate radionuclides in bottom sediment as well as in water column. The transfer of radioactivity between the water column and the pore water in the upper layer of the bottom sediment is governed by the diffusion process. The phase change between dissolved and particulate radionuclides is written in terms of absorption/desorption rates and distribution coefficients. The dependence of distribution coefficients is inversely proportional to the sediment particle size. The hydrodynamic numerical model SELFE that solves equations for the multiple-scale circulation, the wave action and sand transport on the unstructured grids has been used as a base model. We have extended the non-cohesive sediment module of SELFE to the form applicable to mixture of cohesive and non-cohesive sedimentary regimes by implementing an extended form of erosional rate and a flocculation model for the determination of settling velocity of cohesive flocs. Calibration of the sediment transport model in the Yellow Sea usin
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/23888
Bibliographic Citation
AOGS, pp.1, 2017
Publisher
AOGS
Type
Conference
Language
English
Publisher
AOGS
Related Researcher
Research Interests

Coastal Engineering,Marine Environment Model,Coastal Disaster Model,해안공학,해양환경모델링,해안재해모델

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