報告書番号

382045

タイトル（和文）

熱収支量からみた内湾の水環境変化

タイトル（英文）

CHANGE OF WATER ENVIRONMENT IN THE INNER BAYIN CONSIDERATION OF HEAT BALANCE

概要 （図表や脚注は「報告書全文」に掲載しております）

大量の温排水が，発電所周辺の局地気象におよぼす影響を検討しておくことは，自然環境と調和のとれた電源開発をすすめるうえで必要なことと考えられる。本文は三河湾を対象海域として，気象，海象観測資料の解析結果に基して，水柱モデルによる水温シミュレーション解析を行ない，自然海域における大気と海域水との熱交換量を把握するとともに，温排水による熱負荷が加わった場合の熱交換量の変化が自然海域環境のなかにおいて，どのような位置づけとなるかを検討したものである。水温が２℃上昇する範囲における熱交換量の変化分は自然海域における熱交換量の変動の標準偏差と同程度となる。この熱交換量の変化分は，とくにその半分以上を蒸発にともなう潜熱で負担しており，２℃の水温上昇域では蒸発量が約５０％増加する。

概要 （英文）

TO EXAMINE THE EFFECT OF WARM WATER DISCHARGED FROM THERMAL POWER PLANTS INTO THE SEA ON REGIONAL CLIMATIC CONDITION IT IS NECESSARY TO PRECISELY GRASP THE HEAT BALANCE BETWEEN THE SEA SURFACE AND THE ATMOSPHERE IN THAT SEA REGION. THE PRESENT STUDY IS INTENDED TO MAKE CLEAR THE MECHANISM OF HEAT BALANCE IN THE BAY WATER ON THE BASIS OF LOCAL OBSERVATION DATA AND NUMERICAL MODEL SIMULATION,AND TOFIND TO WHAT EXTENT THE HEAT OR VAPOR STEAM WHICH IS GIVEN AGAINST THEATMOSPHERE WILL CHANGE ON THE ASSUMPTION THAT WARM WATER IS DISCHARGEDINTO THIS SEA REGION. MIKAWA BAY WAS SELECTED AS THE SEA REGION FOR THE PRESENT STUDY. A NEMERICAL MODEL SIMULATION ANALYSIS WAS MADE OF THE AMOUNT OF HEAT EXCHANGE BETWEEN THE ATMOSPHERE AND WATER IN THE SEA REGION CONCERNED. AS A RESULT, IT WAS CONFIRMED THAT THE CHANGE OF WATER TEMPERATURE IN THE BAY CAN ACCURATELY BE SIMULATED BY THE NUMERICAL MODEL. USING THIS MODEL, THE AMOUNT OF HEAT EXCHANGE BETWEEN THE ATMOSPHEREAND THE WATER IN THE SEA REGION WAS OBTAINED. CONSEQUENTLY, IT WAS FOUND THAT THE PORTION OF CHANGE IN THE AMOUNT OF HEAT EXCHANGE IN THE SEAREGION IN WHICH WATER TEMPERATURE RISES ABOUT 2DEGREESC FOR EXAMPLE,ISALMOST THE SAME AS STANDARD DEVIATION OF NATURAL CHANGE IN THE AMOUNT OF HEAT EXCHANGE IN THE NATURAL SEA REAGION IN WHICH NO DISCHARGED WARMWATER EXISTS. MOREOVER, THE PORTION OF CHANGE IN THIS AMOUNT OF HEAT EXCHANGE, PARTICULARLY MORE THAN A HALF OF IT, IS BORNE BY LATENT HEAT ACCOMPANIED BY EVAPORATION AND BECAUSE OF THIS, THE AMOUNT OF EVAPORATION IN THE SEA REGION IN WHICH WATER TEMPERATURE RISES 2DEGREESC INCREASES ABOUT 50%.

報告者

キーワード