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海底下CO2地中貯留における海洋潜在的環境影響評価と海水CO2濃度監視
内本, 圭亮;渡辺, 雄二;三角, 和弘;坪野, 考樹;津旨, 大輔;末国, 次朗;薛, 自求
Permalink : http://hdl.handle.net/2115/91742
JaLCDOI : 10.14943/lowtemsci.82.211
KEYWORDS : CCS;二酸化炭素回収・貯留;潜在的環境影響評価;CO2漏出;海底下CO2貯留;Carbon dioxide Capture and Storage;potential environmental impact assessment;CO2 leakage;sub-seabed CO2 storage
Abstract
海底下の地層にCO2を貯留する場合に法令で求められているCO2漏出を仮定した潜在的環境影響評価と貯留サイト海域での海水の化学的性状の監視について，海洋シミュレーション結果を基に考察した．漏出率が同じであればCO2漏出による海水のCO2濃度増加は夏季に最大となる．また，漏出したCO2はすぐに希釈されるため，漏出継続期間は海水のCO2濃度増加にほとんど影響を及ぼさない．したがって，潜在的環境影響評価のための海洋シミュレーションは夏季条件で1か月程度行えばよく，化学的性状の監視は夏季に行うべきである．
In the present paper, potential environmental impact assessment assuming CO2 leakage and monitoring of chemical property in seawater, both of which are mandatory when CO2 is stored in Japan, were discussed based on an ocean simulation. The increase of CO2 concentration in seawater due to CO2 leakage is largest in summer if CO2 leak rate is the same, and the duration of the leakage has little influence on the increase of CO2 concentration owing to quick dispersion. These suggest that the ocean simulation for the potential environmental impact assessment should be performed for a month of the summer season and that the monitoring of chemical property in seawater should be conducted in summer.
In the present paper, potential environmental impact assessment assuming CO2 leakage and monitoring of chemical property in seawater, both of which are mandatory when CO2 is stored in Japan, were discussed based on an ocean simulation. The increase of CO2 concentration in seawater due to CO2 leakage is largest in summer if CO2 leak rate is the same, and the duration of the leakage has little influence on the increase of CO2 concentration owing to quick dispersion. These suggest that the ocean simulation for the potential environmental impact assessment should be performed for a month of the summer season and that the monitoring of chemical property in seawater should be conducted in summer.
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