象山港海洋牧场规划区选址评估的数值模拟研究：滨海电厂温排水温升的影响

应用海洋数值模式ECOM-si(estuarine coastal oceanmodel-semi-implicit),耦合一个可用于实时计算的太阳辐射强度和海面热通量计算模块,研究评估了象山港海洋牧场规划海域受两大滨海电厂(国华电厂和乌沙山电厂)温排水的影响程度。受往复流作用,国华电厂的温排水对海洋牧场区较乌沙山电厂的温排水影响大,海洋牧场西南侧受温排水影响较东北侧大。计算结果表明不同季节海洋牧场温升范围和分布特征各异,经分析主要是因为各季节海气温差所导致。春季增温期的温升幅度最大,可高于1.0℃,且温升范围也最大,对海洋牧场区的影响也最明显。秋季降温期内温升幅度最小(0.3℃～0.5℃),温升范围也最小。分别处于低温期与高温期的冬季与夏季,海气温差小,温升幅度约0.5℃～1.0℃,温升范围亦居中。

Numerical simulation study on site selection evaluation of marine ranching zone in Xiangshan Bay:Effects of thermal water discharged from coastal power plants

This research applied a numerical marine model ECOM-si(estuarine coastal ocean model-semi-implicit),coupling a real-time computational module of solar radiation intensity and sea surface heat flux,to evaluate effects of thermal water discharged from two coastal power plants(Guohua power plant and Wusha Mountain power plant) of the marine ranching zone in Xiangshan Bay.Affected by alternating tidal current,the effect on marine ranching zone of thermal water discharged from Guohua power plant was more significant than the water from Wusha Mountain power plant.The southwest side of ranching zone was easier to be influenced than the northeast side.Due to the fact that difference in air-water temperature varies as season changes,the simulated data showed that each season had different temperature rise range and distribution characteristics around the ranching zone.During temperature rise period in spring,rise range was the largest,exceeding 1.0 ℃,its influential scope of temperature rise was the largest and its effect on ranching zone was also the most significant;nevertheless,during cooling period in autumn,temperature rise range was the smallest(within 0.3 ℃-0.5 ℃),and its influential scope of temperature rise was also the smallest.Winter and summer each was within low temperature period and within high temperature period,respectively.Differences in sea-air temperature in both of the two seasons were small,temperature rise ranges were about 0.5 ℃-1.0 ℃,and their influential scopes were mediate.