基于MIKE3的渤海三维温盐数值模拟

基于有限体积法的MIKE3 Flow Model建立了渤海地区水动力和温盐数值计算模型,并考虑了渤海沿岸十六条主要河流径流输入、风、降水、蒸发、太阳辐射(短波辐射、长波辐射、感热、潜热)等因素的影响。输出2010年数据作为结果,水动力和温盐模拟结果验证良好。经分析得到如下结论:模拟得到的2010年渤海温盐全年变化均呈一峰一谷形式。渤海冬季最高温度出现在渤海海峡附近海域,温度约4.5℃;渤海夏季平均海表温度26.34℃,较1970～1996年渤海海区夏季的平均温度区间22.5～26.5℃明显偏高;夏季温跃层集中在5m-15m深度范围内,渤海海峡处跃层深度超过了20m;模拟得到的冬季莱州湾盐度在27.8～30.4PSU的范围,夏季25～29.5PSU;莱州湾和辽东湾在夏季出现低盐区,辽东湾顶的低盐区面积约1364km^2,黄河口处的低盐区面积约448km^2,小清河口附近的低盐区面积约1029km^2;渤海大部分海域夏季盐度分层并不像温跃层那样明显。

Three Dimensional Numerical Simulation of Temperature and Salinity in the Bohai Sea Based on MIKE3

Based on the finite-volume MIKE3 Flow Model, a hydrodynamic and temperature-salinity numerical model was established in the Bohai Sea. set of factors were taken into consideration: 16 main rivers’ runoff input, wind, precipitation, evaporation and solar radiation(shortwave radiation, long wave radiation, sensible heat, latent heat). Exported data in 2010 was used as the result data. Both hydrodynamic and temperature-salinity simulation results were tested well. ccording to the analysis of the results in 2010, the full year changes of temperature and salinity in Bohai present a peak-valley pattern. In winter, the highest temperature in Bohai appears in the Bohai Strait, which is about 4.5℃. Compared with the average summer temperature 22.5-26.5 during 1970 to 1996, the simulated average sea surface temperature in summer is higher about 26.34℃. Thermoclines in summer concentrate between 5 m-15 m depth, while it is deeper than 20 m in the Bohai Straits. Winter salinity in Laizhou Bay obtained from the simulation is in the range of 27.8 PSU-30.4 PSU, while 25 PSU-29.5 PSU in summer. There are low salinity zones in the Laizhou Bay and Liaodong Bay in summer, about 1364 square kilometers at the north Liaodong Bay, about 448 square kilometers at the Yellow Sea Estuary and about 1029 square kilometers near the Xiaoqinghe River estuary. Halocline in summer is not as obvious as the thermocline.