CAJ | 학술논문

三峡工程坝身泄流与下游水体强烈碰撞,产生大量气泡,当气泡渗透进入水体一定深处时,气泡界面与水体之间的质量交换极易导致水体溶解气体浓度超饱和,可导致鱼类气泡病.该文应用气泡界面传质理论建立了掺气水流的溶解氧浓度对流扩散方程,与气液两相流混合模型相耦合,模拟计算了三峡大坝在库水位为139m情况下溶解氧浓度变化情况,成功地与现场观测数据进行了验证,完善了气泡界面传质系数公式.对关键因子进行敏感分析,表明气含率、紊动强度、下游水深是决定溶解氧浓度的关键因素.
삼협공정패신설류여하유수체강렬팽당,산생대량기포,당기포삼투진입수체일정심처시,기포계면여수체지간적질량교환겁역도치수체용해기체농도초포화,가도치어류기포병.해문응용기포계면전질이론건립료참기수류적용해양농도대류확산방정,여기액량상류혼합모형상우합,모의계산료삼협대패재고수위위139m정황하용해양농도변화정황,성공지여현장관측수거진행료험증,완선료기포계면전질계수공식.대관건인자진행민감분석,표명기함솔、문동강도、하유수심시결정용해양농도적관건인소.
Strong colliding between the water flow discharged from spillway and the water-body in the stilling basin will produce a lot of air bubbles in the downstream of the Three Georges Dam. Bubble mass transfer will be dominant and can cause total dissolved gas (TDG) supersaturation. Elevated TDG level has a negative effect on aquatic organisms in the form of gas bubble trauma (GBT). Dissolved oxygen (DO) transport model was developed in this paper and used to simulate the physical processes of gas transfer coupled with the air-water two-phase mixture flow model. Supersaturated DO concentration in the water-body downstream was successfully calculated during spillage when the water level is 139m in the Three Georges reservoir. Sensitivity analysis showed that the gas void ratio at plunge point, the turbulence intensity and tailwater depth are the most dominant factors in determining DO concentrations.